Earthquakes in the United States, October-December 1982

Dallas L. Peck, Director

Introduct ion................................................................. Dl Discussion of tables ......................................................... 1 Modified Mercalli Intensity Scale of 1931.................................... 8 Acknowledgments.............................................................. 33 References cited............................................................. 33

FIGURE 1. "Earthquake Report" form.......................................... D2

ILLUSTRATIONS

2. Map showing standard time zones of the conterminous United States. 4
3. Map showing standard time zones of Alaska and Hawaii.............. 5
4. Map of earthquake epicenters in the conterminous United States for October-December 1982............................................. 6
5. Map of earthquake epicenters in Alaska for October-December 1982.. 7
6. Map of earthquake epicenters in Hawaii for October-December 1982.. 8
7. Isoseismal map for the southern California earthquake of 1 October 1982.............................................................. 18
8. Isoseismal map for the central California earthquake of 25 October 1982.............................................................. 20
9. Isoseismal map for the northern California earthquake of 16 December 1982..................................................... 24
10. Isoseismal map for the southeastern Idaho earthquake of 14 October 1982.............................................................. 27
11. Isoseismal map for the southeastern South Dakota earthquake of 15 November 1982..................................................... 31

TABLES

Page TABLE 1. Summary of United States earthquakes for October-December 1982: Alaska........................................................ D10 Arizona....................................................... 11 Arkansas...................................................... 11 California.................................................... 12 California Off the coast..................................... 13 Colorado...................................................... 14 Georgia....................................................... 14 Hawaii........................................................ 14 Idaho......................................................... 14 Maine......................................................... 15 Massachusetts................................................. 15 Montana....................................................... 15 Nevada........................................................ 15 New Hampshire................................................. 15 New Mexico.................................................... 15 New York...................................................... 15 Oregon........................................................ 15 Oregon Off the coast......................................... 15 Rhode Island.................................................. 16 South Dakota.................................................. 16 Tennessee..................................................... 16 Texas ............... .*......................................... 16 Washington Off the coast..................................... 16 Wyoming....................................................... 16

2. Summary of macroseismic data for United States earthquakes, October-December 1982;

Alabama....................................................... D17 Alaska........................................................ 17 Arizona....................................................... 17 Arkansas...................................................... 17 California.................................................... 18 California Off the coast..................................... 25 Colorado...................................................... 25 Georgia...............'........................................ 26 Hawaii........................................................ 26 Idaho......................................................... 27 Iowa.......................................................... 29 Maine......................................................... 29 Montana....................................................... 29 Nebraska...................................................... 29 Nevada........................................................ 29 New Hampshire................................................. 29 New Mexico.................................................... 30 Oregon........................................................ 30 Rhode Island.................................................. 30 South Dakota.................................................. 30 Tennessee..................................................... 31 Texas......................................................... 31 Utah.......................................................... 32 Vermont....................................................... 32 Washington.................................................... 32 Wyoming....................................................... 32

INTRODUCTION

The earthquake information in this publication supplements that published by the United States Geological Survey (USGS) in the National Earthquake Information Service (NEIS) publications, PDE ("Preliminary Determination of Epicenters") and "Preliminary Determination of Epicenters Monthly Listing," by providing detailed felt and intensity data for United States earthquakes . The purpose of this circular is to provide a complete listing of macroseismic effects of earthquakes, which can be used in risk studies, nuclear powerplant site evaluations, seismicity studies, and to answer inquiries by the public. This circular will be the last quarterly issue containing information on United States earthquakes. Beginning with 1983, the data will be published annually in a U.S. Geological Survey special publication entitled "United States Earthquakes".

This publication contains two major sections. The first section (table 1), which is mainly concerned with data obtained by seismographs, is a tabular listing of earthquakes in chronological order by State, consisting of the following basic information: date, origin time, hypocenter, magnitude, maximum intensity, and computational source of the hypocenter. The second section, which concerns intensity information, consists of isoseismal or intensity maps and table 2. This section may contain information about events that were felt but were not listed in the PDE because there was not enough instrumental data to obtain a solution. The list of earthquakes in table 1 was compiled from those located in the United States or nearby offshore areas that were published in the PDE; from aftershock studies carried out by the U.S. Geological Survey and other organizations; from hypocenters in California greater than magnitude 3.0 supplied by the California Institute of Technology, Pasadena, the University of California, Berkeley, and other offices of the U.S. Geological Survey; from hypocenters in Hawaii supplied by the U.S. Geological Survey, Hawaiian Volcano Observatory; and from other institutions as listed in the acknowledgments. Known or suspected explosions are also listed in tables 1 and 2.

Dl The intensities and macroseismic data were compiled from information obtained from postal questionnaires (form shown as fig. 1)> from newspaper articles, and from other Government agencies, State institutions, local organizations, and individuals. (See "Acknowledgments" for a list of collaborators.) Figure 1 is the questionnaire currently in use by the USGS. Other types of questionnaires are used by State agencies, engineering firms, and other Government agencies to collect intensity data. Anyone wishing to submit felt or damage information on earthquakes for inclusion in future reports should send it to the U.S. Geological Survey, United States Earthquakes Project, Mail Stop 967, Box 25046, Denver Federal Center, Denver, CO 80225. Copies of the current "Earthquake Report" questionnaire can be obtained at that address.

the primary source of macroseismic data for an intensity survey; however, on-site field investigations are made following earthquakes that do significant damage. The "Earthquake Report" questionnaires (fig. 1) are mailed to postmasters within the area affected by the earthquake. The completed forms are returned to the USGS, where they are evaluated and intensity values are assigned to individual locations. For large or significant earthquakes, the intensity observations are plotted and isoseismal maps are prepared. Note that the isoseismals represent a general intensity level and that they do not necessarily agree with every individual observation.

tables 1 and 2 include the date, origin time, hypocenter (epicenter and focal depth), magnitude, intensity, and source of the computed solution. The origin time and date are listed in Universal Coordinated Time (UTC) and in local standard time based on the time-zone maps in figures 2 and 3. The epicenters, which were taken from those published in the PDE or from other sources as noted, are listed here to two decimals. The accuracy of the epicenters is not The USGS uses the postal questionnaire as

DISCUSSION OF TABLES

The parameters for the earthquakes in FIGURE 1. Example of the "Earthquake Report" form used for evaluating the intensities of earthquakes. A, front side.

D2

FIGURE 1. Example of the "Earthquake Report" form used for evaluating the intensities of earthquakes. B, reverse side.

D3

FIGURE 2. Standard time zones of the conterminous United States. The number in each zone shows

necessarily indicated by the number of decimals listed. The epicenters located by the NEIS usually are accurate to two-tenths of a degree or less. In general, epicenters located offshore are less accurate than those on land, even though they are listed to two decimals. In regions covered by dense networks of seismo-

graphs, such as California, epicenter accuracy is significantly better than the two-tenths of a degree listed. Depths are listed to the nearest whole kilometer.

The magnitude values listed in tables 1 and 2 were furnished by cooperating institutions or determined by USGS. The computational sources are labeled according to the assigned letter codes shown in headnotes to tables 1 and 2; the letter follows the value listed under the column heading "Magnitude." In table 1, the absence of a letter code indicates that the source is USGS. The magnitude values calculated by USGS are based on the following formulas:

MS .661ogl>f3 .3 , (1) the number of hours to be subtracted from Universal Coordinated Time to convert to local standard time. (Subtract 1 hour less for local daylight-saving time.)

DA

as adopted by the International Association of Seismology and Physics of the Earth's Interior (IASPEI; Bath, 1966, p. 153), where A is the maximum vertical surface-wave ground amplitude, in micrometers; T is the period, in seconds, and 18OK22; and D is the distance, in geocentric degrees (station to epicenter), and 20°<p<_160°. No depth correction is made for depths less than 50 km.

mb=log(A/T)+Q(D,h), (2)

as defined by Gutenberg and Richter (1956), except that T, the period in seconds, is restricted to O.KTO.O, and A, the ground amplitude in micrometers, is not necessarily the maximum of the P-wave group. Q is a function of distance D and depth h, where D>5°.

ML=logA-logA (3)

as defined by Richter (1958, p. 340), where A is the maximum trace amplitude in millimeters, written by a Wood-Anderson torsion seismometer, and log A is a standard value as a function of distance, where the distance is <600 km. ML FIGURE 2. Standard time zones of the conterminous United States. The number in each zone shows the number of hours to be subtracted from Universal Coordinated Time to convert to local standard time. (Subtract 1 hour less for local daylight-saving time.)

values are also calculated from other seismometers by conversion of recorded ground motion to the expected response of the torsion seismometer.

as proposed by Nuttli (1973), where A/T is expressed in micrometers per second, calculated from the vertical-component 1-second Lg waves, and D is the distance in geocentric degrees.

MD is used in this publication for the duration or coda length magnitude. MD is usually computed from the difference, in seconds, between Pn- or Pg-wave arrival time and the time the final coda amplitude decreases to the background-noise amplitude. These magnitudes are normally correlated with ML or mbLg so that resulting magnitudes are compatible. Thus the geographic regions formulas vary for different and seismograph systems.

Figures 4-6 are maps summarizing the earthquake activity for the conterminous United States, Alaska, and Hawaii for the period October-December 1982. The magnitudes represented in these figures are based on ML, Mn, or MD; if none of these were computed, then on MS; and finally on mb, when it was the only magnitude computed.

All the intensity values (indicated by Roman numerals) listed in this summary were determined, using the Modified Mercalli Intensity Scale of 1931 (Wood and Neumann, 1931) shown below, from the evaluation of "Earthquake Report" forms; from field reports by U.S. Geological Survey personnel, engineering firms, or universities; and from detailed macroseismic data communicated to the USGS by people in the area affected by the earthquake. All earthquake reports received that contain minimal or sketchy information are listed only as "FELT". This

o Magnitude <5.0 O Magnitude 5.0-5.9

FIGURE 4. Earthquake epicenters in the conterminous United States for October-December 1982, plotted from table 1. FIGURE 5. Earthquake epicenters in Alaska for October-December 1982, plotted from table 1.

FIGURE 6. Earthquake epicenters in Hawaii for October-December 1982, plotted from table 1.

designation does not imply that the earthquake was felt at a low intensity level, but indicates that the available data are not sufficient for assigning a valid intensity value. These reports are filed in the offices of the NEIS or in government archives and are available for detailed study.

MODIFIED MERCALLI INTENSITY

Adapted from Sieberg's Mercalli-Cancani

I. Not felt - or, except rarely under espe-

II. Felt indoors by few, especially on upper

III. Felt indoors by several, motion usually VII.

c >

SCALE OF 1931

scale, modified and condensed.

cially favorable circumstances. Under certain conditions, at and outside the boundary of the area in which a great shock is felt: sometimes birds, animals, reported uneasy or disturbed; sometimes dizziness or nausea experienced; sometimes trees, structures, liquids, bodies of water, may sway doors may swing, very slowly.

floors, or by sensitive, or nervous persons. Also, as in grade I, but often more noticeably: sometimes hanging objects may swing, especially when delicately suspended; sometimes trees, structures, liquids, bodies of water, may sway, doors may swing, very slowly; sometimes birds, animals, reported uneasy or disturbed; sometimes dizziness of nausea experienced.

rapid vibration. Sometimes not recognized to be an earthquake at first. Duration estimated in some cases. Vibra-IV,

VI.

D8

tion like that due to passing of light, or lightly loaded trucks, or heavy trucks some distance away. Hanging objects may swing slightly. Movements may be appreciable on upper levels of tall structures. Rocked standing motor cars slightly.

Felt indoors by many, outdoors by few. Awakened few, especially light sleepers. Frightened no one, unless apprehensive from previous experience. Vibration like that due to passing of heavy or heavily loaded trucks. Sensation like heavy body striking building or falling of heavy objects inside. Rattling of dishes, windows, doors; glassware and crockery clink and clash. Creaking of walls, frame, especially in the upper range of this grade. Hanging objects swung, in numerous instances. Disturbed liquids in open vessels slightly. Rocked standing motor cars noticeably.

Felt indoors by practically all, outdoors by many or most: outdoors direction estimated. Awakened many, or most. Frightened few slight excitement, a few ran outdoors. Buildings trembled throughout. Broke dishes, glassware, to some extent. Cracked windows in some cases, but not generally. Overturned vases, small or unstable objects, in many instances, with occasional fall. Hanging objects, doors, swing generally or considerably. Knocked pictures against walls, or swung them out of place. Opened, or closed, doors, shutters, abruptly. Pendulum clocks stopped, started or ran fast, or slow. Moved small objects, furnishings, the latter to slight extent. Spilled liquids in small amounts from well-filled open containers. Trees, bushes, shaken slightly.

Felt by all, indoors and outdoors. Frightened many, excitement general, some alarm, many ran outdoors. Awakened all. Persons made to move unsteadily. Trees, bushes, shaken slightly to moderately. Liquid set in strong motion. Small bells rang church, chapel, school, etc. Damage slight in poorly built buildings. Fall of plaster in small amount. Cracked plaster somewhat, especially fine cracks chimneys in some instances. Broke dishes, glassware, in considerable quantity, also some windows. Fall of knickknacks, books, pictures. Overturned furniture in many instances. Moved furnishings of moderately heavy kind.

Frightened all general alarm, all ran outdoors. Some, or many, found it difficult to stand. Noticed by persons driving motor cars. Trees and bushes shaken moderately to strongly. Waves on ponds, lakes, and running water. Water turbid from mud stirred up. Incaving to some extent of sand or gravel stream banks. Rang large church bells, etc. Suspended objects made to quiver. Damage negligible in buildings of good design and construction, slight to moderate in well-built ordinary buildings, considerable in poorly built or badly designed buildings, adobe houses, old walls (especially where laid up without mortar), spires, etc. Cracked chimneys to considerable extent, walls to some extent. Fall of plaster in considerable to large amount, also some stucco. Broke numerous windows, furniture to some extent. shook down loosened brickwork and tiles. Broke weak chimneys at the roof-line (sometimes damaging roofs). Fall of cornices from towers and high buildings. Dislodged bricks and stones. Overturned heavy furniture, with damage from breaking. Damage considerable to concrete irrigation ditches.

VIII. Fright general alarm approaches panic. Disturbed persons driving motor cars. Trees shaken strongly branches, trunks, broken off, especially palm trees. Ejected sand and mud in small amounts. Changes: temporary, permanent; in flow of springs and wells; dry wells renewed flow; in temperature of spring and well waters. Damage slight in structures (brick) built especially to withstand earthquakes. Considerable in ordinary substantial buildings, partial collapse: racked, tumbled down, wooden houses in some cases; threw out panel walls in frame structures, broke off decayed piling. Fall of walls. Cracked, broke, solid stone walls seriously. Wet ground to some extent, including ground on steep slopes. Twisting, fall, of chimneys, columns, monuments, also factory stacks, towers. Moved conspicuously, overturned, very heavy furniture.

IX. Panic general. Cracked ground conspicuously. Damage considerable in (masonry) structures built especially to withstand earthquakes: Threw out of plumb some wood-frame houses built especially to withstand earthquakes; great in substantial (masonry) buildings, some collapse in large part; or wholly shifted frame buildings off foundations, racked frames; serious to reservoirs; underground pipes sometimes broken.

X. Cracked ground, especially when loose and

XI. Disturbances in ground many and wide-

XII. Damage total practically all works of

D9 wet, up to widths of several inches; fissures up to a yard in width ran parallel to canal and stream banks. Landslides considerable from river banks and steep coasts. Shifted sand and mud horizontally on beaches and flat land. Changed level of water in wells. Threw water on banks of canals, lakes, rivers, etc. Damage serious to dams, dikes, embankments. Severe to well-built wooden structures and bridges, some destroyed. Developed dangerous cracks in excellent brick walls. Destroyed most masonry and frame structures, also their foundations. Bent railroad rails slightly. Tore apart, or crushed endwise, pipe lines buried in earth. Open cracks and broad wavy folds in cement pavements and asphalt road surfaces.

spread, varying with ground material. Broad fissures, earth slumps, and land slips in soft, wet ground. Ejected water in large amounts charged with sand and mud. Caused sea-waves ("tidal" waves) of significant magnitude. Damage severe to wood-frame structures, especially near shock centers. Great to dams, dikes, embankments often for long distances. Few, if any (masonry) structures remained standing. Destroyed large well-built bridges by the wrecking of supporting piers, or pillars. Affected yielding wooden bridges less. Bent railroad rails greatly, and thrust them endwise. Put pipe lines buried in earth completely out of service.

construction damaged greatly or destroyed. Disturbances in ground great and varied, numerous shearing cracks. Landslides, falls of rock of significant character, slumping of river banks, etc., numerous and extensive. Wrenched loose, tore off, large rock masses. Fault slips in firm rock, with notable horizontal and vertical offset displacements. Water channels, surface and underground, disturbed and modified greatly. Dammed lakes, produced waterfalls, deflected rivers, etc. Waves seen on ground surfaces (actually seen, probably, in some cases). Distorted lines of sight and level. Threw objects upward into the air.

D10

n

150.57 W. 149.23 W. 178.31 W. 148.79 W. 150.71 W. 175.92 W. 149.66 W. 153.40 W. 150.91 W. 152.84 W. 170.45 W. 151.45 W. 152.15 W. 151.99 W. 160.45 W. 152.74 W. 149.31 W. 172.18 E. 153.47 W. 178.92 W. 151.11 W. 175.53 E. 179.05 E. 147.31 W. 149.15 W. 150.97 W. 152.83 W. 150.05 W. 149.80 W. 147.19 W. 150.84 W. 152.06 W. 153.52 W. 153.11 W. 173.29 E. 174.98 W. 170.88 E. 141.14 W. 147.10 W. 148.61 W. 159.88 W. 150.79 W. 152.35 W. 149.23 W. 146.40 W. 149.76 W. 151.84 W. 152.07 W. 161.24 W. 161.35 W. 150.80 W.

114.38 W. 112.01 W.

92.22 W.

92.23 W.

92.22 W.

4.3 33N 33N k\2 33N

33N 5.5 4.9 33N 4.6 33N 4.8

33N 33N 4.6 3.6 4.6 4.2 4.4 33N 4.4 33N

33N 4.4 33N 3\9

4.4 33N 33N 5\2 4.4 33N 4.6

... *iv

in

06 24 58.7 09 21 16.4 12 19 32.8 14 29 04.6 14 33 06.4 14 37 15.9 14 38 19.2 17 14 42.1 20 01 26.3 20 45 55.4 20 46 03.2 21 14 13.3 22 10 21.9 22 11 28.8 09 33 05.9 11 52 15.6 14 01 56.4 16 01 21.1 09 47 42.9 10 20 50.5 18 43 28.5 21 06 24.2 10 38 16.3 11 38 40.5 11 55 29.3 15 50 05.0 17 54 36.0 09 42 59.1 05 11 25.7 08 22 46.7 17 32 31.9 00 51 32.3 16 11 31.5 16 28 06.4 19 34 50.5 09 57 20.5 12 51 42.3 12 54 13.9 13 53 21.5 08 24 22.4 00 49 42.2 14 27 45.5 22 04 00.8 04 04 53.5 19 23 35.8 18 34 46.6 19 23 19.0 20 37 32.6 22 26 04.3 22 34 32.1 23 12 18.0 23 15 54.5 23 35 20.6 15 48 43.8 20 42 30.4 10 21 41.7 21 29 39.3 09 40 36.3 00 52 11.2 09 20 20.6 08 19 51.8 14 43 13.3 05 47 57.3 15 10 41.3 16 13 40.7 35.75 N. 35.75 N. 35.73 N. 35.73 N. 35.70 N. 35.76 N. 35.72 N. 35.75 N. 35.75 N. 35.75 N. 35.75 N. 35.73 N. 35.72 N. 35.72 N. 37.88 N. 37.47 N. 35.82 N. 35.75 N. 35.82 N. 32.02 N. 35.75 N. 35.75 N. 35.42 N. 35.77 N. 35.77 N. 35.72 N. 35.73 N. 37.52 N. 37.49 N. 35.82 N. 35.82 N. 34.20 N. 37.48 N. 37.46 N. 37.49 N. 34.20 N. 37.47 N. 37.45 N. 37.45 N. 36.64 N. 35.52 N. 33.27 N. 37.03 N. 35.73 N. 35.73 N. 36.61 N. 34.08 N. 36.33 N. 36.33 N. 36.33 N. 36.34 N. 36.34 N. 36.33 N. 36.32 N. 36.34 N. 33.88 N. 36.35 N. 33.83 N. 36.34 N. 35.72 N. 35.73 N. 35.73 N. 35.88 N. 38.44 N. 33.88 N.

n

117.75 W. 117.75 W. 117.75 W. 117.75 W. 117.73 W. 117.78 W. 117.73 W. 117.75 W. 117.75 W. 117.73 W. 117.73 W. 117.73 W. 117.77 W. 117.77 W. 118.43 W. 118.83 W. 117.73 W. 117.75 W. 117.75 W. 116.32 W. 117.77 W. 117.73 W. 118.27 W. 117.60 W. 117.60 W. 117.73 W. 117.73 W. 118.81 W. 118.82 W. 117.73 W. 117.73 W. 118.65 W. 118.84 W. 118.82 W. 118.82 W. 118.65 W. 118.84 W. 118.84 W. 118.84 W.

D12

3. OP

3.8P

3. IP

3.7P 3.8P

3. IP

4.3P 4.2P 3.7B 3.7B 3.5P 3.5P

3. OP
4. IP

3.9P

3. OP

3.5P

3. OP
4. OP

3.2P 3.9P

3. IB
4. OB

3.7P

3. IP

2.2P 3.9B 3.3B 3.9B 3.3P 3.2B 3.9B 3.4B

3. OB
4. OP

3.3P

3. OB

3.7P 2.6B 2.8B 4.2B

4. OB

2.6B 2.6B 2.6B 2.9P 2.9B 2.9P

3. OB

3.2P

3. OP
4. IP
5. OP

"v *vi

11 22 57.9 14 07 40.9 12 18 29.8 20 22 10.5 10 05 49.2 10 37 41.9 03 08 23.2 21 27 56.8 06 02 32.3 35.73 N. 39.74 N. 38.83 N. 34.05 N. 37.48 N. 32.98 N. 35.33 N. 36.69 N. 39.80 N. 35.82 N. 32.88 N. 40.72 N. 38.28 N. 34.84 N. 33.53 N. 37.44 N. 39.17 N. 34.27 N. 36.92 N. 34.02 N. 37.54 N. 37.53 N. 36.91 N. 40.54 N. 40.50 N. 35.08 N. 35.80 N. 40.54 N. 37.57 N. 37.53 N. 37.64 N. 37.36 N. 33.47 N. 35.75 N. 37.48 N. 35.88 N. 35.82 N. 35.70 N. 38.81 N. 36.81 N. 37.49 N. 37.49 N. 35.82 N. 35.82 N. 35.82 N. 33.95 N. 35.82 N. 35.82 N. 35.82 N. 35.80 N. 35.80 N. 35.82 N.

41.56 N. 40.39 N. 40.56 N. 41.84 N. 40.40 N.

n

117.73 W. 120.60 W. 116.67 W. 118.82 W. 115.57 W. 120.54 W. 121.20 W. 122.67 W. 117.73 W. 115.97 W. 124.22 W. 122.16 W. 118.96 W. 118.20 W. 118.85 W. 122.21 W. 119.57 W. 121.70 W. 117.13 W. 118.82 W. 118.81 W. 121.49 W. 124.20 W. 124.26 W. 116.82 W. 120.43 W. 123.97 W. 118.87 W. 118.87 W. 118.96 W. 118.52 W. 116.57 W. 117.75 W. 118.87 W. 120.38 W. 117.73 W. 117.73 W. 122.78 W. 121.55 W. 118.80 W. 118.81 W. 117.75 W. 117.75 W. 118.82 W. 117.73 W. 117.73 W. 117.75 W. 117.75 W. 117.75 W. 117.75 W.

126.26 W. 125.07 W. 124.55 W. 126.56 W. 127.13 W. 126.76 W. 124.52 W. 125.34 W. 127.08 W.

1A

1A 1A 1A 1A 1A

1A

n o

57.6 36.8 28.6 53.5 03.7 AA.6 26.5 3A.1

52. A

29.0 56.4 30.6 45.7 32.7 58.2 15 4.4 29.0 27.4 12.9 A3. A A4.1 01.0 36.3 37.3

57. A
58. A

37.7 37.6 11.7 51.6 12.1 1A.7

52. A
53. A

30.8 55.0 29.5 A2.9 5A.A A

D14

iii "iv

II

u

1A

n mb

iii

'iv

i i

D15

NOV. 6 03 50 12.4 41.79 N. 71.56 W. 2 ... ... 1.8J IV J NOV. 5 10 P.M. EST

NOV. 15 02 58 22.9 43.01 N. 97.85 W. 5 ... ... 4.3G V G NOV. 14 08 P.M. CST

OCT. 17 19 53 43.0 36.24 N. 89.42 W. 5 ... ... 2.6K III K OCT. 17 01 P.M. CST

OCT. 14 12 52 46.3 36.10 N. 102.57 W. 5 ... ... 3.9G IV G OCT. 14 06 A.M. CST NOV. 28 02 36 48.5 33.00 N. 100.84 W. 5 ... ... 3.3T IV G NOV. 27 08 P.M. CST

WASHINGTON OFF THE COAST NOV. 12 02 57 52.6 47.87 N. 128.73 W. 10 4.4 ... ... ... G NOV. 11 06 P.M. PST

OCT. 1 22 55 29.6 44.33 N. 110.85 W. 5 ... ... 3.0G IV G OCT. 1 03 P.M. MST NOV. 8 01 18 29.3 44.78 N. 110.92 W., 5 ... ... 3.2G III G NOV. 7 06 P.M. MST RHODE ISLAND

D16

31 October (G) Western Georgia Origin time: 03 07 39.4

See Georgia listing.

31 October (G) Western Georgia Origin time: 03 12 15.6

See Georgia listing.

4 October (G) Andreanof Islands, Aleutian Islands Origin time: 07 46 52.8 Epicenter: 51.44 N., 176.62 W. Depth: 38 km Magnitude: 5.5mb(G), 5.0MS(G), 4.9MS(B)

Felt on Adak Island (M).

4 November (G) Southern Alaska Origin time: Epicenter: Depth: Magnitude:

Felt at Anchorage and Palmer (M).

5 November (G) Central Alaska Origin time: 13 06 46.7 Epicenter: 67.81 N., 150.06 W. Depth: Normal Magnitude: 4.5ML(M)

Felt at Wiseman.

10 November (G) Southern Alaska Origin time: Epicenter: Depth: Magnitude:

Felt at Cordova and Valdez (M).

5 December (G) Southern Alaska Origin time: 12 09 51.8 Epicenter: 60.26 N., 152.15 W.

5.2ML(M)

00 04 56.5 61.53 N., 151.62 W. 120 km None computed

17 23 52.5 60.90 N., 146.42 W. 40 km 4.8mb(G), 4.3ML(M)

D17

16 December (G) Southern Alaska

24 December (G) Near Islands, Aleutian Islands

28 December (G) Southern Alaska

1 November (G) Northwestern Arizona

19 November (G) Northwestern Arizona

21 November (K) Central Arkansas ALASKA Cont inued

Depth: 90 km Magnitude: 4.9mb(G) Intensity IV: Homer (press report),

Origin time: Epicenter: Depth: Magnitude: Intensity II: Palmer and Sutton (M)

Origin time: Epicenter: Depth: Magnitude: Intensity IV; Shemya AFB, Shemya Island.

Origin time: Epicenter: Depth: Magnitude: Intensity III: Valdez (M).

Origin time: Epicenter: Depth: Magnitude: Intensity IV: Temple Bar.

Origin time: 20 57 34.6 Epicenter: 36.03 N., 112.01 W. Depth: 5 km Magnitude: 3.0ML(G)

Felt at the Grand Canyon (University of Northern Arizona telephone report).

Origin time: Epicenter: Depth: Magnitude: Intensity III: Felt; Enola (press report). 09 34 44.8 62.25 N., 150.97 W. 98 km None computed

23 31 03.0 52.58 N., 173.29 E. 72 km 5.2mb(G)

19 40 02.7 61.58 N., 146.40 W. 53 km 3.9mb(G), 4.4ML(M)

23 14 21.8 36.03 N., 114.38 W. 5 km 3.3ML(G)

16 27 39.4 35.19 N., 92.22 W. 3 km 2.9Mn(T) Naylor (press report), 21 November (K) Central Arkansas Origin time: Epicenter: Depth: Magnitude: Intensity IV Intensity III Felt; Enola (press report).

1 October (P) Southern California Origin time: 14 29 04.6 Epicenter: 35.73 N., 117.75 W. Depth: 8 km Magnitude: 4.9mb(G), 5.4ML(B), 5.2ML(P)

This earthquake was felt over an area of about 29,800 km2 in Inyo, Kern, Los Angeles, San Bernardino, and Tulare Counties (fig. 7).

The quake, the largest of five tremors in four days, was described as a "sharp jolt' by a Ridgecrest resident (press report).

At the China Lake Naval Weapons Center, a wall in a newly constructed building was cracked. There was no damage to the underground storage facilities where missiles and bombs are stored (press report),

Intensity VI:

Barstow many large cracks in interior dry

Inyokern many large cracks in interior

Little Lake few items were thrown from

Ridgecrest hairline cracks in interior ARKANSAS Cont inued

Naylor (press report) : Mount Vernon.

walls.

dry walls and plaster/stucco walls, few items were thrown from store shelves, few small objects fell, hanging objects or doors were swung moderately, hanging pictures were swung, buildings shook strongly, felt by all, awakened and frightened several.

store shelves, many small objects were overturned and fell, hanging pictures fell, water sloshed in swimming pools, felt by all, awakened many and frightened all.

plaster/stucco walls, felt by many, awakened and frightened few. Much merchandise was dumped from store shelves. One resident reported that bricks in his fireplace had shifted (press report). 16 35 28.3 35.19 N., 92.23 W. 3 km 3.4Mn(T)

D18

FIGURE 7. Isoseismal map for the southern California earthquake of 01 October 1982, 14 29 04.6 UTC. Roman numerals represent Modified Mercalli intensities between isoseismals; Arabic numerals are used to represent these intensities at specific sites.

Intensity V: \ NEVADA I

Caliente few cracked windows, few small objects were overturned and fell, few glassware or dishes were broken, hanging pictures were swung, felt by many, awakened and frightened few. Cantil hairline cracks in interior plaster/stucco walls, few small objects were overturned and fell, hanging pictures were swung out of place, building shook strongly, felt by several, awakened and frightened few. Johannesburg few items were thrown from store shelves, few small objects were overturned and fell, few glassware or dishes were broken, hanging pictures were swung out of place, felt by many, awakened few. Trona hairline cracks in interior plaster/stucco walls, water sloshed in swimming pools, light furniture or small appliances were overturned, few small objects overturned and fell, hanging pictures were swung out of place, hanging objects or doors were swung moderately, felt by all.

Intensity IV; Lancaster, Leona Valley, Onyx, Red Mountain. Intensity III; California Hot Springs (Pine Flat area), Death Valley, George Air Force Base, Glennville, Helendale, Oro Grande, Phelan, Pioneer Point, Porterville, Skyforest, Woody. Intensity II; Mountain Mesa, Yermo . Felt; Glendale, Goldstone Tracking Station, and Victorville (P).

2 October (B) Mammoth Lakes area Origin time: Epicenter: Depth: Magnitude:

Felt at Mammoth Lakes (B).

14 October (P) Southern California Origin time: 00 51 32.3 Epicenter: 34.20 N. , 118.65 W. Depth: 2 km Magnitude: 2.2ML(P)

Felt at Canoga Park (P) .

14 October (B) Mammoth Lakes area Origin time: 16 11 31.5 Epicenter: 37.48 N., 118.84 W. Depth: 8 km Magnitude: 3.7ML(P), 3.9ML(B)

Felt at Mammoth Lakes (B).

14 October (B) Mammoth Lakes area Origin time: 19 34 50.5 Epicenter: 37.49 N. , 118.82 W. Depth: 14 km Magnitude: 3.9ML(B), 3.9ML(P)

Felt at Mammoth Lakes (B) .

15 October (P) Southern California Origin time: Epicenter: Depth: Magnitude: Intensity V;

Simi Valley few items were thrown from

Intensity IV; Canoga Park, Chatsworth, Northridge, Pacoima. Felt; Malibu, Reseda, Van Nuys, Westwood (press report).

CALIFORNIA Continued CALIFORNI A Continued

store shelves, few small objects were overturned and fell, felt by and awakened many, frightened several. 11 52 15.6 37.47 N., 118.83 W. 5 km 3.7ML(B)

09 57 20.5 34.20 N., 118.65 W. 4 km 3.3ML(P)

D19

16 October (B) Mammoth Lakes area

19 October (P) Southern California

19 October (B) Central California

24 October (P) Southern California

25 October (B) Central California Origin time: Epicenter : Depth: Magni tude : Intensity IV: Bishop. Felt; Mammoth Lakes (B).

Origin time: Epicenter: Depth: Magnitude:

Felt at Bakersfield (P).

Origin time: 22 04 00.8 Epicenter: 37.03 N., 121.74 W. Depth: 11 km Magnitude: 3.7ML(B)

This earthquake was felt throughout the San Francisco Bay area from Marin City to Monterey (B).

Intensity IV; Aromas, Morgan Hill. Intensity III; Aptos, Castroville, Freedom, Santa Clara, Watsonville. Felt; Gilroy and San Martin (B).

Origin time: Epicenter: Depth: Magnitude: Intensity V:

Saticoy few windows were cracked, few small objects were overturned and fell, few glassware or dishes were broken, hanging pictures were swung, felt by many, awakened and frightened few. Ventura few windows were cracked, felt by many, frightened several. Intensity IV; Oxnard. Felt; Point Mugu (P).

Origin time: 22 26 04.3 Epicenter: 36.33N., 120.50 W. Depth: 11 km Magnitude: 5.3mb(G), 5.2MS(G), 5.4ML(B),

This earthquake was felt over an area of about 92,800 km2 of central California (fig. 8). The earthquake was felt in at least 14 counties from Kern County on the 12 54 13.9 37.45 N., 118.84 W 7 km 3.9ML(B), 3.9ML(P)

00 49 42.2 35.52 N., 119.12 W. 6 km 3.6ML(P)

19 23 19.0 34.08 N., 119.22 W. 14 km 3.7ML(P), 3.8ML(B)

5.4ML(P)

FIGURE 8. Isoseismal map for the central California earthquake of 25 October 1982,

south to Santa Clara County on the north and from coastal San Luis Obispo County to Mono County on the eastern slope of the Sierra Nevada (press report).

At Coalinga, Lt. McDaniel of the state Highway Parol said, "when the trembling started, we got out of the building.... telephone poles and wires were swaying." He also reported that several stores were closed due to fallen merchandise blocking the aisles (press report). 22 26 04.3 UTC. Roman numerals represent Modified Mercalli intensities between isoseismals; Arabic numerals are used to represent these intensities at specific sites.

D20

A radio announcer for KOLI in Coalinga described the earth motion as "like a big jackhammer up and down" (press report).

A hunter, 25 miles northwest of Coalinga in the coastal mountain range (between San Lucas and Priest City), gave the following account of the earthquake. "I was sitting on a steep hillside when the rock I was sitting on began moving. I immediately jumped up. I was nearly thrown off balance. I remember reaching down to hold Intensity VI;

Avenal small amounts of plaster fell from ceiling, some cracks in interior plaster walls, few items were thrown from store shelves, building shook strongly, a stationary 5-ton truck rocked slightly, felt by all, frightened few. Coalinga tiles fell from interior walls, many items were thrown from store shelves, hanging pictures were swung out of place, building shook strongly, observer experienced difficulty in standing or walking, hanging objects or doors were swung moderately, few small objects overturned and fell, felt by and frightened all. Sultana foundation was cracked, felt by many, frightened few. Tranquillity interior walls were split, hairline cracks in plaster/stucco walls, building shook strongly, felt by many, frightened few. Intensity V:

Alpaugh hairline cracks in plaster/stucco and dry walls, hanging pictures were swung, building shook strongly, felt by and frightened all. Burrel hairline cracks in interior dry wall and plaster/stucco walls, moving vehicles were rocked slightly, few items were thrown from store shelves, hanging pictures were swung out of place, few small objects were overturned and fell, few glassware or dishes were broken, Intensity IV; Armona (hanging pictures were light furniture or appliances were overturned, felt by many, frightened few. Calwa hairline cracks in plaster/stucco and drywall, felt by many. Cantua Creek moving vehicles were rocked ' moderately, few small objects were overturned, building shook strongly, observer experienced difficulty in standing or walking, felt by and frightened many. Farmersville moving vehicles were rocked slightly, few items were thrown from

D21

store shelves, few small objects were overturned, felt by many. Five Points hairline cracks in plaster or stucco interior walls, few windows were cracked, hanging objects or doors were swung moderately, hanging pictures were swung, felt by all, frightened few. Fresno hairline cracks in interior plaster/stucco and dry walls, few windows were cracked, few items were thrown from store shelves, few small objects were overturned and fell, few glassware or dishes were broken, hanging pictures were swung, felt by many, frightened several, awakened few. Goshen few windows were cracked, felt by and frightened several. Helm many small objects were overturned and fell, pictures were swung, felt by and frightened many. Raisin hanging objects or doors were swung moderately, observer experienced difficulty in standing or walking, felt by and frightened several. Soledad few small objects were overturned and fell, few glassware or dishes were broken, felt by and frightened several. Stratford few small objects were overturned and fell, hanging pictures were swung, hanging objects or doors were swung moderately, building shook strongly, felt by and frightened many. Visalia water splashed onto sides of swimming pools, lakes or ponds; building shook stronly; few small objects were overturned and fell; hanging pictures were swung; felt by many; frightened several. Waukena hairline cracks in interior dry walls; water splashed onto sides of swimming pools, lakes or ponds; few windows were cracked; few small objects were overturned and fell; few glassware or dishes were broken; hanging objects or doors were swung; felt by many; frightened few.

swung out of place), Aromas, Arroyo Grande, Atascadero, Auberry (hanging pictures were swung out of place), Avila Beach, Big Creek, Big Sur, Bishop (hanging pictures were swung), Bradley, Caliente, Capitola, Carmel Valley, Caruthers, Castle AFB, Coarsegold, Corcoran, Creston (hanging pictures were swung), Dos Palos, Earlimart, Easton (hanging pictures were swung), El Portal (hanging pictures were swung), Fellows, Firebaugh, Fort Hunter CALIFORNIA Continued C ALIFORNI A~Cont inued

Liggett, Gonzales, Huron, Independence, Keene, King City, Kingsburg, La Grange (hanging pictures were swung), Lakeshore, Lemoncove, Lemoore (hanging pictures were swung), Lemoore Naval Air Station (telephone service interrupted), Lockwood (hanging pictures were swung), Lone Pine (hanging pictures were swung), McFarland, Miramonte, Monterey (hanging pictures were swung), Morro Bay, O'Neals, Onyx, Paso Robles, Porterville (hanging pictures were swung), Prather, Reedley, Ridgecrest (hairline cracks in interior plaster/stucco walls, hanging picures were swung), Salinas, San Ardo (hanging pictures were swung), San Joaquin, San Luis Obispo (press report), San Miguel (hanging pictures were swung out of place), San Simeon, Santa Margarita (hanging pictures were swung), Selma, Shaver Lake, Snelling (shelves in a mobil home with ceramics were pulled away from wall causing few glassware/dishes to be broken), Templeton (hanging pictures were swung), Three Rivers, Tipton (hanging pictures were swung), Traver, Yettem, Wasco, Woodlake. Intensity III: Ahwanee, Bakersfield (hanging pictures were swung), Buellton, Buttonwillow, Carmel, Castroville, Chualar, Clovis, Cutler, Del Rey, Denair, Dinuba, Ducor (hanging pictures were swung), El Nido, Glennville, Greenfield, Hanford, Hollister, Ivanhoe, Jolon, Keyes, Lake Isabella (hanging pictures were swung), Laton, Lindsay, Los Alamos (hanging pictures were swung), Los Banos, Lost Hills, Mendota, Modesto, Moss Landing, Orange Cove, Paicines, Pismo Beach (hanging pictures were swung), Red Top, Richgrove, Riverbank, Riverdale, Santa Rita Park (hanging pictures were swung), Shatter, Shandon, Soquel, Stevinson, Strathmore, Tulare, Venture, Winton, Yosemite National Park. Intensity II: Alameda, Avery, Catheys Valley, Hilmar, Milpitas, Orcutt, Orosi, Planada, San Francisco, San Juan Bautista. Felt; Atwater, Chowchilla, Glendale (P), Merced, Monterey (P), Pasadena (P), Sacramento (P), San Jose (P), Santa Maria (P), Seaside, Tres Pinos, Wofford Heights.

25 October (B) Central California Origin time: 23 12 18.0 Epicenter: 36.34 N., 120.51 W. Depth: 12 km Magnitude: 4.3mb(G), 4.2ML(P), 4.3ML(B)

Felt in the Coalinga-Hanford area (B).

D22

25 October (B) Central California

27 October (P) Southern California

28 October (P) Southern California

4 November (B) Northern California

4 November (P) Southern California

9 November (B) Northern California

10 November (P) Southern California Origin time: Epicenter: Depth: Magnitude:

Felt in the Coalinga-Hanford area (B).

Origin time: 10 21 41.7 Epicenter: 33.88 N., 118.22 W. Depth: 15 km Magnitude: >2.9ML(P)

This earthquake was felt in portions of southern Los Angeles County (press report), including Gardena (P) and Hunting ton Park.

Origin time: Epicenter: Depth: Magnitude:

Felt at Riverside (P).

Origin time: Epicenter: Depth: Magnitude:

Felt in Napa County (press report).

Origin time: 16 13 40.7 Epicenter: 33.88 N., 117.92 W. Depth: 6 km Magnitude: 2.8ML(P)

Felt at Anaheim, Buena Park, and Fullerton (P).

Origin time: Epicenter: Depth: Magnitude: Intensity IV: Blairsden, Portola.

Origin time: Epicenter: Depth: Magnitude: Intensity V:

Big Bear Lake few windows were cracked, hanging pictures were swung out of 23 15 54,.5 36.34 N., 120.50 W, 11 km 4.0ML(P), 4.0ML(B)

09 40 36.3 33.83 N., 117.10 W. 17 km 2.9ML(P)

15 10 41.3 38.44 N., 122.27 W. 14 km 3.2ML(B)

11 12 05.8 39.74 N., 120.60 W. 10 km 3.0ML(B)

11 21 25.7 34.05 N., 116.67 W. 8 km 4.1mb(G), 4.4ML(B), 3.9ML(P)

Desert Hot Springs few items were thrown

Idyllwild few small objects fell; felt

White Water hanging pictures fell; few

Intensity IV: Cabazon, Forest Falls, Mecca, Marongo Valley. Intensity III..; Banning, Indio, Landers, North Palm Springs, Thousand Palms.

10 November (B) Mammoth Lakes area Origin time: Epicenter: Depth: Magnitude:

Felt at Mammoth Lakes.

12 November (P) Imperial Valley Origin time: 09 33 55.2 Epicenter: 32.98 N., 115.57 W. Depth: 14 km Magnitude: 2.6ML(P)

Felt in the Imperial Valley (P).

12 November (B) Central California Origin time: 21 57 11.9 Epicenter: 35.33 N., 120.54 W. Depth: 9 km Magnitude: 3.4ML(P), 3.0ML(B)

Felt at San Luis Obispo (B) .

13 November (B) Central California Origin time: Epicenter: Depth: Magnitude: Intensity III Felt: Hollister

26 November (B) Northern California Origin time: 09 29 49.1 Epicenter: 38.28 N., 122.16 W. Depth: 11 km Magnitude: 3.3ML(B) CALIFORNIA Continued CALIFORNIA Continued

place, few small objects were overturned and fell, few glassware or dishes were broken.

from store shelves, few small objects were overturned, felt by many, awakened and frightened several.

by, awakened, and frightened several.

small objects were overturned and fell; building shook slightly to strongly; hanging objects or doors were swung moderately; felt by, awakened , and frightened many. 13 29 57.4 37.48 N., 118.82 W. 5 km 3.6ML(B)

20 18 20.5 36.69 N., 121.20 W. 9 km 3.7ML(B) Prunedale, Salinas.

(B)

D23

26 November (P) Southern California

28 November (B) Mammoth Lakes area

2 December (B) Northern California

4 December Southern California

7 December (B) Central California

12 December (B) Mammoth Lakes area

12 December (B) Mammoth Lakes area Intensity IV: Napa. Felt; Fairfield (B), Martinez (press report).

Origin time: Epicenter: Depth: Magnitude: Frazier Park. Intensity IV : Lebec. Intensity III Intensity II: Ontario.

Origin time: Epicenter: Depth: Magnitude:

Felt at Mammoth Lakes.

Oriin time: 16 02 45.9 Epicenter: 39.17 N., 122.21 W. Depth: 10 km Magnitude: 3.0ML(B)

Felt in the Lake Berryessa and Clear Lake areas (B).

Origin time: 03 08 Epicenter: Depth: Magnitude: Intensity III

Origin time: 23 05 39.1 Epicenter: 36.92 N., 121.70 W. Depth: 10 km Magnitude: 3.1ML(B)

Felt at Watsonville (B).

Origin time: Epicenter: Depth: Magnitude:

Felt at Mammoth Lakes (B).

Origin time: 20 59 08.8 Epicenter: 37.53 N., 118.81 W, 12 30 13.8 34.84 N., 118.96 W. 5 km 3.1ML(P)

14 43 19.1 37.44 N., 118.85 W. 3 km 3.5ML(B)

Not located Not computed 2.2ML(P) Inglewood (press report)

10 38 06.0 37.54 N., 118.82 W. 6 km 3.5ML(P), 3.6ML(B) 40°

FIGURE 9. Isoseismal map for the northern California earthquake of 16 December 1982, 06 53 01.3 UTC. Roman numerals represent Modified Mercalli intensities between isoseismals; Arabic numerals are used to represent these intensities at specific sites.

Depth:

Magnitude:

Felt at Mammoth Lakes (B).

14 December (B) Central California Origin time: 06 46 09.9 Epicenter: 36.91 N., 121.49 W, Depth: 5 km Magnitude: 3.2ML(B)

Felt at Hollister (B).

14 December (B) Northern California Origin time: 19 15 31.8 Epicenter: 40.54 N. , 124.20 W. Depth: 20 km Magnitude: 3.6ML(B)

Felt at Ferndale (B).

16 December (B) Northern California Origin time: 06 53 01.3 4 km 3.8ML(P), 3.7ML(B) CALIFORNIA Cont inued

Epicenter: 40.50 N., 124.26 W. Depth: 18 km Magnitude: 4.8mb(G), 4.5MS(G), 4.4ML(B)

This earthquake was felt over an area of about 8,200 km2 of northern California (fig. 9).

The Fortuna sheriff dispatcher gave the following account of the earthquake: "It wasn't one of the nice, gentle rollers. It was like a big bang. It shook for about 45 seconds. Then there was another, like an aftershock, for about 20 seconds, a rumbling" (press report).

Residents in Ferndale reported windows shattered, chimneys cracked, and pictures were knocked off the walls in the restored section of Victorian homes and businesses.

In Fortuna, stores had broken windows and grocery stores had cans knocked from shelves (press report).

Intensity VI:

Ferndale chimneys were cracked, windows were shattered, pictures were knocked from walls (press report). Fortuna chimneys were cracked, plate glass windows were broken or shattered, much merchandise was knocked from store shelves (press report). Rio Dell few items were thrown from store shelves; hanging pictures were swung out of place with some fallen; some windows were broken; few small objects were overturned, fell, and were broken; light furniture or small appliances were overturned; few glassware or dishes were broken; hanging objects or doors were swung moderately; felt by all.

Intensity V;

Bayside moving vehicles were rocked slightly, few small objects were overturned and fell, few glassware or dishes were broken. Samoa few items were thrown from store shelves, few small objects were overturned and fell. Scotia few small objects were overturned and fell, hanging doors or objects were swung moderately. Intensity IV; Alderpoint, Arcata, Blue Lake, Bridgeville, Carlotta, Eureka, Honeydew, Hydesville, Korbel, Loleta, Orleans, Phillipsville, Salyer, Whitethorn.

CALIFORNIA Cont inued CALIFORNI A Continued

Intensity III; Forks of Salmon, Gasquet, McKinleyville, Miranda, Piercy, Swains Flat. Intensity II; Sawyers Bar, Willow Creek. Felt; Weott.

20 December (B) Northern California Origin time: Epicenter; Depth; Magnitude:

Felt ain the Eureka area (B).

21 December Northern California Origin time; Epicenter: Depth: Magnitude: Intensity III;

report).

21 December (B) Mammoth Lakes area Origin time: Epicenter: Depth: Magnitude:

Felt at Mammoth Lakes (B).

22 December (B) Owens Valley area Origin time: Epicenter: Depth: Magnitude:

Felt in the Bishop area (B).

22 December (P) Southern California Origin time: 14 47 36.9 Epicenter: 35.75 N., 117.75 W. Depth: 10 km Magnitude: 3.8ML(B), 3.3ML(P)

Felt at Ridgecrest (P).

26 December (B) Northern California Origin time: 09 59 46.6 Epicenter: Depth: Magnitude: Intensity IV Cobb (press report).

26 December (B) Central California Origin time: 10 04 24.9 Epicenter: 36.81 N., 121.55 W, 00 08 21.1 40.54 N., 123.97 W. 5 km 3.3 ML(B)

09 33 Not located None computed 2.3ML(B) Clearlake Highlands (press

22 28 12.9 37.63 N., 118.96 W. 5 km 3.7ML(P), 3.3ML(B)

09 40 49.9 37.36 N., 118.52 W. 10 km 3.4ML(P), 3.4ML(B)

38.81 N., 122.78 W. 1 km 3.1ML(B)

D25

28 December (B) Mammoth Lakes area

28 December (B) California-Nevada border region

30 December (P) Southern California

31 December (P) Southern California

4 December (B) Northern California

22 November (G) Northwestern Colorado Depth: Magnitude:

Felt at Hollister and San Juan Bautista (B)

Origin time: Epicenter: Depth: Magnitude:

Felt at Mammoth Lakes (B).

Origin time: 19 06 24.0

See Nevada listing.

Origin time: 04 00 29.5 Epicenter: 33.95 N., 118.82 W. Depth: 0 km Magnitude: 3.6ML(P), 4.0mb(G) Intensity III: Malibu (press report).

Origin time: 09 07 23.3 Epicenter: 35.82 N., 117.73 W. Depth: 6 km Magnitude: 4.4mb(G), 4.5ML(B), 4.0ML(P) Intensity IV; Trona.

CALIFORNIA Off the Coast

Origin time: Epicenter: Depth: Magnitude:

Felt at Honeydew amd Petrolia (B)

Origin time: 10 09 01.4 Epicenter: 39.74 N., 107.58 W. Depth: 5 km Magnitude: 2.9ML(G)

Felt at the Rifle Fish Hatchery about 15 miles northeast of Rifle (telephone report). 6 km 3.5ML(B)

00 49 38.8 37.49 N., 118.80 W. 3 km 3.8ML(P), 3.6ML(B)

03 08 23.2 40.30 N., 124.52 W. 24 km 3.1ML(B)

COLORADO 31 October (G) Western Georgia Origin time: 03 07 39.4 Epicenter: 32.66 N., 84.91 W. Depth: 5 km Magnitude: 2.9Mn(G), 2.9MD(K)

This earthquake was felt in Harris and Muscogee Counties in Georgia and Russell County, Alabama. Many of the citizens described the earthquake sound as an explosion, a plane crash, or a train derailment (press report).

Intensity V;

Intensity IV;

Alabama Phenix City.

Georgia Buena Vista, Cataula, Columbus

Intensity III;

Alabama Smiths.

Georgia Columbus (Baker Village, Lindsay

31 October (G) Western Georgia Origin time: 03 12 15.6 Epicenter: 32.65 N., 84.87 W. Depth: 5 km Magnitude: 3.1Mn(G)

Felt in Harris and Muscogee Counties in Georgia and in the Phenix City, Alabama area (press report).

21 December (F) Central Georgia Origin time: 05 30 46.2 Epicenter: 32.80 N., 83.52 W. Depth: 0 km Magnitude: 2.7MD(F) GEORGIA GEORGIA Cent inued

Columbus (Beallwood) few small objects fell, felt by many, awakened several, frightened few. Elberslie few small objects were overturned and fell, small amounts of plaster/stucco fell from interior walls, felt by many, awakened and frightened several. Midland few small objects were overturned and fell, few glassware or dishes were broken, felt by many, awakened and frightened several.

(Windsor Park), Upatoi.

Creek, Wynnton), Columbus Metropolitan Airport, Hamilton.

D26

11 October (H) Island of Hawaii

22 October (H) Island of Hawaii

23 October (H) Island of Hawaii

25 October (H) Island of Hawaii

1 November (H) Island of Hawaii

13 November (H) Island of Hawaii This is one of a swarm of 100 earthquakes recorded in this area from December 1982 to March 1983.

Intensity III; Macon.

Origin time: Epicenter: Depth: Magnitude: Intensity III; Hawaiian Volcano Observatory.

Origin time: Epicenter: Depth: Magnitude: Intensity II; Hilo, Mauna Kea Observatory.

Origin time: Epicenter: Depth: Magnitude: Intensity II: Volcano.

Origin time: Epicenter: Depth: Magnitude: Intensity III; Hilo, Volcano.

Origin time: Epicenter: Depth: Magnitude: Intensity II; Puu Oo.

Origin time: 02 18 58.2 Epicenter: 19.45 N., 155.44 W. Depth: 15 km Magnitude: 4.1ML(H), 4.4mb(G) Intensity V; Pahala. Intensity IV; Hilo, Kurtistown, Volcano. Intensity III; Kamuela, Kealakekua, Paauilo.

18 59 53.5 19.38 N., 155.25 W. 3 km 3.1ML(H)

13 13 29.0 19.33 N., 155.19 W. 10 km 3.3ML(H)

07 42 56.4 19.35 N., 155.22 W, 9 km 3.0ML(H)

16 19 30.6 19.33 N., 155.19 W. 10 km 3.2ML(H)

02 24 45.7 19.33 N., 155.12 W. 8 km 3.0ML(H)

Origin time:

Epicenter:

Depth:

Magnitude:

Intensity III; Pahala.

25 November (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity III;

28 November (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude:

Intensity IV: Hawaii Volcanoes National Park.

Intensity III; Volcano.

10 December (H) Island of Hawaii Origin time: 06 00 51.6 Epicenter: 19.39 N., 155.24 W. Depth: 4 km Magnitude: 3.1ML(H) Intensity IV: Hawaii Volcanoes National Park, Intensity III; Volcano.

28 December (H) Island of Hawaii Origin time: 09 35 01.9 02 28 29.0 19.46 N., 155.43 W. 15 km 3.3ML(H)

19 10 37.3 19.36 N., 155.30 W. 35 km 3.6ML(H) Hilo, Pahala.

31 December (H) Island of Hawaii

7 October (G) Southeastern Idaho

D27

Epicenter: Depth: Magnitude: Intensity II:

Origin time: Epicenter: Depth: Magnitude: Intensity II;

Origin time: Epicenter: Depth: Magnitude: Intensity IV;

Wyoming Freedom. Intensity II;

Wyoming Thayne.

19.34 N., 155.10 W. 9 km 3.2ML(H) Hilo.

13 55 10.0 19.38 N., 155.24 W. 1 km 3.4ML(H) Volcano.

09 26 02.6 43.00 N., 111.07 W. 5 km 3.0ML(G), 3.5MD(D) 8 October (U) Southeastern Idaho Origin time: Epicenter: Depth: 7 km Magnitude: 3.5ML(U) Intensity IV;

Idaho Dingle, Geneva, Georgetown, Soda

Intensity III;

Idaho Bancroft, Bloomington.

Wyoming Etna, Freedom.

8 October (U) Southeastern Idaho Origin time: Epicenter: Depth: Magnitude: Intensity V;

Conda few items were thrown from store

Soda Springs a few homes reported

8 October (U) Southeastern Idaho Origin time: 16 04 09.0 Epicenter: 42.63 N., 111.49 W. Depth: 7 km Magnitude: 3.2ML(U)

Felt at Soda Springs (press report).

14 October (U) Southeastern Idaho Origin time: 04 10 24.3 Epicenter: 42.59 N. , 111.43 W Depth: 7 km Magnitude: 4.6mb(G), 4.7ML(U), 4.9ML(D)

This earthquake was felt over an area of about 13,500 km2 of Idaho, Utah, and Wyoming (fig. 10). The earthquake was heard but not felt at Idaho Falls where the noise was described as sounding like a "sonic boom."

Intensity VI;

Idaho IDAHO Co nt inued IDAHO Continued

Springs.

shelves, few small objects were overturned and fell , building shook strongly, hanging pictures were, swung, felt by many.

enlarged wall cracks.

Soda Springs hairline cracks in interior dry walls , a crack in basement walls was enlarged, foundation was cracked, buildings shook slightly to strongly, hanging pictures were swung, hanging objects or doors were swung moderately, felt by many, awakened few, frightened several. Soda Springs (4 miles southeast) bricks 09 53 32.1 Intensity V; 42.62 N., 111.47 W.

10 06 59.0 42.62 N., 111.47 W. 7 km 3.8ML(U), 4.0ML(D)

24 December (G) Southeastern Idaho Idaho

Intensity IV;

Idaho Dingle (pictures were swung out of

Wyoming Etna (few small objects were

Intensity III;

Idaho Bancroft, Inkom (building shook

Utah Plymouth, Snowville.

Wyoming Smoot (water beds jiggled). Intensity II;

Idaho Franklin.

Wyoming Thayne.

Origin time: 15 11 20.1 Epicenter: 42.12 N., 112.56 W. Depth: 5 km Magnitude: 3.5ML(U)

fell from chimneys and a few buildings were reported damaged.

Bloomington a stack of wood fell, few small objects fell, building shook slightly to strongly, felt by several. Clifton hairline cracks in interior dry wall, felt by few, frightened few. Conda few items were thrown from store shelves, few small objects fell, felt by many, awakened few. Geneva few small objects were overturned and fell, hanging pictures were swung, felt by many, awakened several. Georgetown few items were thrown from store shelves; water sloshed in swimming pools, lakes, or ponds; few small objects overturned; hanging pictures were swung out of place; hanging objects or doors were swung moderately; buildings shook slightly to strongly; felt by all; awakened and frightened many. Lava Hot Springs few windows were cracked, few small objects were overturned and fell, few glassware or dishes were broken, hanging pictures were swung, felt by many. Montpelier few small objects were overturned and fell, hanging pictures were swung, felt by many, awakened few, frightened several.

place), Grace, Nounan (pictures were swung out of place), Ovid, Paris, Pocatello (few items were thrown from store shelves), Swan Lake, Thatcher, Wayan.

overturned).

strongly), Preston, Saint Charles. 15 November (G) Southeastern South Dakota Origin time: 02 58 22.9

See South Dakota listing.

1 December (J) Central New Hampshire Origin time: 22 52 23.0

See New Hampshire listing.

21 October (G) Hebgen Lake area Origin time: 06 05 28.2 Epicenter: 44.72 N., 111.83 W. Depth: 5 km Magnitude: 4.4MD(D), 4.4ML(G) Intensity IV; Belgrade. Intensity III; Lima, Pony. Felt; Livingston and Virginia City (telephone report).

26 October (G) Hebgen Lake area Origin time: Epicenter: Depth: Magnitude: Intensity IV; Virginia City. Intensity III; Melrose, Twin Bridges

4 November (G) Hebgen Lake area Origin time: Epicenter: Depth: Magnitude: Intensity IV: Harrison.

15 November (G) Southeastern South Dakota Origin time: 02 58 22.9

See South Dakota listing.

08 26 29.9 44.75 N., 111.75 W. 5 km 4.3MD(D), 4.6ML(G)

09 58 29.9 44.72 N., 111.72 W, 5 km 4.2ML(G), 4.1MD(D)

D29

12 November (E) Southern Nevada

7 December (G) Southern Nevada

10 December (E) Southern Nevada

28 December (B) California-Nevada border region

1 December (J) Central New Hampshire Origin time: 22 52 23.0 Epicenter: 43.61 N., 71.49 W. Depth: 0 km Magnitude: 2.9Mn(J)

This earthquake was felt at many towns near

Residents in the Lakeport section of Laconia Origin time: 19 17 00.103 Epicenter: 37.02 N., 116.03 W. Depth: 0 km Magnitude: 4.4mb(G), 4.3ML(B)

Nevada Test Site explosion "SEYVAL" at 37°01'25.21" N., 116°0r55.49" W., surface elevation 1214 m, depth of burial 366 m.

Origin time: Epicenter: Depth: Magnitude: Intensity II; Boulder City,

Origin time: 15 20 00.090 Epicenter: Depth: Magnitude:

Nevada Test Site explosion "MANTECA" at 37°01'48.66" N., 116°04'18.80" W., surface elevation 1263 m, depth of burial 413 m.

Origin time: 19 06 24.8 Epicenter: Depth: Magnitude: Intensity IV;

California Benton. Intensity III;

California Miramonte.

Nevada Dyer, Mina, Schurz. Felt;

California Bishop and in the Mono Lake area (B).

Lake Winnipesaukee in the Laconia-Meredith area (press report).

thought that their furnaces had exploded or they described the sound as similar to a sonic boom (press report). 09 43 49.6 36.02 N., 114.83 W. 5 km 3.3ML(G), 3.7ML(P)

37.03 N., 116.07 W. 0 km 4.6mb(G), 4.7ML(B)

38.03 N., 118.42 W. 8 km 4.7mb(G), 5.2ML(P), 4.9ML(B)

Intensity IV:

New Hampshire Laconia (Lakeport section) (press report). Intensity III;

Maine Eliot.

New Hampshire Meredith (press report).

Intensity II;

Maine East Waterboro.

New Hampshire Hampton, Lebanon.

Vermont Springfield.

Felt;

Maine North Fryeburg, Scarborough.

1 December (J) Central New Hampshire Origin time: 23 05 02.2 Epicenter: 43.62 N., 71.55 W. Depth: 0 km Magnitude: 2.2Mn(J)

Felt in the Laconia-Meredith area (press report).

7 October (G) Central New Mexico Origin time: 12 41 25.9 Epicenter: 34.31 N., 106.82 W. Depth: 4 km Magnitude: 2.4ML(G)

Felt at Socorro.

14 October (G) Texas Panhandle Origin time: 12 52 46.3

See Texas listing.

21 November (G) Northwestern Oregon Origin time: 04 57 32.8 Epicenter: 45.90 N., 122.89 W. Depth: 22 km Magnitude: 2.5ML(G)

Felt in the Woodland, Washington area (press report).

6 November (J) Northern Rhode Island

15 November (G) Southeastern South Dakota

D30

Origin time: 03 50 12.4 Epicenter: 41.79 N., 71.56 W. Depth: 2 km Magnitude: 1.8MD(J)

A group of three tremors was reported felt and heard in the Crompton area of West Warkwick. The police reported no damage, "just a lot of people shaken up and a lot of houses rattled" (press report).

Intensity IV; Crompton (press report).

Origin time: 02 58 22.9 . Epicenter: 43.01 N., 97.85 W. Depth: 5 km Magnitude: 4.3Mn(T), 4.3Mn(G)

This earthquake was felt over an area of about 19,700 km2 of northeastern Nebraska, southeastern South Dakota, and western Iowa (fig. 11).

The most common report by people in the affected area was a description of the earthquake sound; they thought that their furnaces had exploded.

Intensity V;

Nebraska Center hairline cracks in plaster, stucco, and drywall interior walls; few windows were cracked; few items were thrown from store shelves; few small objects were overturned and fell; few glassware or dishes were broken. Coleridge few small objects fell. Crofton few items were thrown from store shelves, few windows were cracked, few small objects were overturned and fell, few glassware or dishes were broken. Fordyce hairline cracks in plaster walls, felt by many. Hoskins few small objects were overturned and fell. Niobrara few items were thrown from store shelves, few small objects were overturned and fell, few glassware or 17 October (K) Northwestern Tennessee

14 October (G) Texas Panhandle

Magnitude: 3.9Mn(G), 3.8Mn(T)

D31

windows were cracked; hanging pictures were swung. Intensity IV;

Iowa Doon, Rock Valley, Sergeant Bluff, Sioux City. Nebraska Alien, Battle Creek, Bloomfield, Brunswick, Concord, Creighton, Emerson, Ewing, Hartington, Hubbard, Laurel, Maskell, McLean, Neligh, Newcastle (hanging pictures were swung out of place), Orchard, Fender (few small objects fell), Pierce, Saint Helena, Verdel, Verdigre, Waterbury, Wausa, Wynot. South Dakota Alcester, Avon, Davis, Hurley, Irene, Kaylor, Lesterville, Lindy (press report), Meckling, Menno, Monroe, Tyndall, Vermillion. Intensity III;

Iowa Akron, Brunsville.

Nebraska Jackson, Lynch, Oakdale, Obert, Osmond, Royal, South Sioux City Wayne. South Dakota Burbank, Centerville, Dante, Jefferson, Olivet, Springfield, Viborg, Wakonda. Intensity II;

Iowa Westfield.

Nebraska Tilden. Felt;

Nebraska Clearwater.

South Dakota Sherman, Utica (press report), Wagner (press report).

Origin time; Epicenter: Depth: Magnitude: Intensity III;

Origin time: 12 52 46.3 Epicenter: 36.10 N., 102.57 W. Depth: 5 km

The earthquake was described as "just like a sonic boom" and "rumbled like a big train was coming through." TENNESSEE

19 53 43.0 36.24 N., 89.42 W. 5 km 2.6MD(K) Ridgely (K).

TEXAS Intensity IV; 21 November (G) Northwestern Oregon Texas Hartley. Intensity III:

New Mexico Amistad, Sedan (hanging pictures were swung). Intensity II:

Texas Dalhart, Texline.

28 November (G) West Texas Origin time: 02 36 48.5 Epicenter: 33.00 N., 100.84 W. Depth: 5 km Magnitude: 3.3Mn(T) Intensity IV; Synder. Intensity III; O'Donnell. Intensity II: Dermott.

14 October (U) Southern Idaho Origin time: 04 10 24.3

14 October (U) Southeastern Idaho See Idaho listing.

24 December (G) Southeastern Idaho Origin time: 15 11 20.1

See Idaho listing.

1 December (J) Central New Hampshire Origin time: 22 52 23.0

See New Hampshire listing.

D32

1 October (G) Yellows tone National Park

7 October (G) Southeastern Idaho

8 October (U) Southeastern Idaho

8 November (G) Ye Hows tone National Park Origin time: 04 57 32.8

See Oregon listing.

Origin time: Epicenter: Depth: Magnitude: Intensity IV: Old Faithful.

Origin time: 09 26 02.6

See Idaho listing.

Origin time: 09 53 32.1

See Idaho listing.

Origin time: 04 10 24.3

See Idaho listing.

Origin time: Epicenter: Depth: Magnitude: Intensity III; Madison Junction.

Yellowstone National Park Origin time : 03 40 Epicenter: Depth: Magnitude: Intensity IV; Grant Village.

22 55 29.6 44.33 N., 110.85 W. 5 km 3.0ML(G)

01 18 29.3 44.78 N., 110.92 W. 5 km 3.2ML(G), 3.6MD(D)

Not located None comput ed None comp ut ed

ACKNOWLEDGMENTS

Listed below are the collaborators who furnished data to the U. S. Geological Survey for use in this circular:

ALASKA: Staff of National Oceanic and

CALIFORNIA: Clarence R. Alien, Seismological

Bruce A. Bolt, Seismograph Sta-

HAWAII: Robert Y. Koyanagi, U.S. Geologi-

MASSACHUSETTS: Staff of Weston Observatory, Bos-

MISSOURI: Robert Hermann and Otto Nuttli,

MONTANA: Anthony Qamar, University of Mon-

NEW YORK: Lynn R. Sykes and Alan L. Kafka,

OKLAHOMA: James E. Lawson, Jr., Oklahoma Atmospheric Administration, Alaska Tsunami Warning Center, Palmer.

Laboratory, California Institute of Technology, Pasadena.

tion, University of California, Berkeley.

cal Survey, Hawaiian Volcano Observatory, Hawaii Volcanoes National Park.

ton College, Weston.

Department of Geology and Geophysics, St. Louis University, St. Louis.

tana, Missoula.

Lamont-Doherty Geological Observatory, Columbia University, Palisades.

Geophysical Observatory, Oklahoma Geological Survey, Leonard.

D33 TENNESSEE: A. Johnson, Tennessee Earthquake

UTAH: Department of Geology and Geophy-

VIRGINIA: G. A. Bollinger, Department of

WASHINGTON: Robert S. Crosson, Geophysics

Bath, Markus, 1966, Earthquake energy and magni-

Gutenberg, B., and Richter, C. F., 1956, Magni-

Nuttli, 0. W., 1973, Seismic wave attenuation

Richter, C. F., 1958, Elementary seismology:

Wood, H. 0., and Neumann, F., 1931, Modified

REFERENCES CITED

tude, in Physics and chemistry of the Earth, Volume 7: Oxford and New York, Pergamon Press, p. 115-165.

tude and energy of earthquakes: Annali di Geofisica, v. 9, no. 1, p. 1-15.

and magnitude relations for eastern North America: Journal of Geophysical Research, v. 78, no. 5, p. 876-885.

San Francisco, W. H. Freeman, 768 p.

Mercalli Intensity Scale of 1931: Seismological Society of America Bulletin, v. 21, no. 4, p. 277-283.

Information Center, Memphis State University, Memphis.

sics, University of Utah, Salt Lake City.

Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg.

Program, University of Washington, Seattle.

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