Earthquakes in the United States, April-June 1978

By J. H. Minsch, C. W. Stover, and P. Hubiak

G E 0 L 0 G I CAL C I R C U LA R 8 1 9- B United States Department of the Interior

CECIL D. ANDRUS, Secretary

H. William Menard, Director

Free on application to Branch of Distribution, U.S. Geological Survey, 1200 South Eods Street, Arlington, VA 22202

B2 B3 B4

BS

FIGURE 4.--Earthquake epicenters in the conterminous United States for April-June 1978, plotted from table 1.

o

FIGURE 5.--Earthquake epicenters in Alaska for April-June 1978, plotted from table 1.

FIGURE 6.--Earthquake epicenters in Hawaii for

an Intensity the offices archives and study.

MODIFIED MERCALLI INTENSITY SCALE

Adapted from Sieberg's Mercalli-Cancani scale,

I.

II.

April-June 1978, plotted from table 1.

II.

modified and condensed.

Not felt - or, except rarely under especially certain conditions, the boundary of the area in which a great shock is felt: reported times dizziness or nausea experienced; sometimes trees, bodies of water, may sway--doors swing, very slowly.

Felt indoors by few, upper floors, nervous persons. Also, as in grade but often more noticeably: sometimes hanging objects may when trees, water, may very slowly; sometimes birds, animals, reported times dizziness or nausea experienced.

Felt indoors by several, motion ally rapid recognized to be an first.

These reports of the NElS or are

OF 1931

delicately suspended; structures, sway,

vibration.

sometimes birds, animals, or disturbed; some-

Vo

are filed in in government for

especially by sensitive, or

in some IV.

v. Felt indoors by practically all, out-

may VI.

B8

cases. ing trucks, tance away. Hanging objects may swing slightly. on upper Rocked standing motor cars slightly.

Felt indoors few. sleepers. apprehensive from previous experience. Vioration like that due to passing of heavy or heavily loaded trucks. Sensation like heavy body striking building or falling of Rattling glassware clash. frame, of this grade. in liquids Rocked standing motor cars noticeably.

doors by direction estimated. or excitement, Buildings Broke extent. cases, turned vases, small or unstable objects, in many instances, fall. generally pictures out of place. doors, clocks stopped, started or ran fast, or nishings, the latter to slight Spilled from well-filled Trees, bushes, shaken slightly.

Felt by Frightened some alarm, many ran ened unsteadily. slightly in strong motion. church, chapel, slight in poorly built buildings. of plaster in small amount. plaster cracks chimneys in Broke erable quantity, also some windows. of knick-knacks, books, pictures. turned Moved furnishings of moderately heavy kind.

Vibration like that due to passof or

especially in the upper range

most.

against walls, or swung them

slow.

all.

furniture light, heavy trucks

Movements may be appreciable

by many, few, Frightened no one,

Hanging objects swung, instances. open vessels

Frightened a few trembled glassware, Cracked not

or considerably.

Moved small objects, fur-

Persons Trees, moderately. Liquid set

tall structures.

windows, doors;

or most:

windows--in generally.

abruptly.

excitement general, outdoors.

in lightly loaded some dis-

objects inside.

throughout.

small containers.

etc.

instances.

Disturbed slightly.

outdoors.

to some some Over-

extent.

outdoors.

Damage Fall Cracked fine

consid-Fall Over-VII.

VIII.

IX. Panic general. Cracked ground conspicu-Frightened ran outdoors. found by persons Trees and bushes shaken moderately to strongly. running water. Water turbid from mud stirred. of sand or gravel stream banks. large church objects made to quiver. Damage negligible in and moderate ings, considerable in or badly houses, laid up without mortar), spires, Cracked extent, walls to some extent. Fall of plaster in amount, numerous windows, furniture extent. and tiles. Broke weak chimneys at roof-line Fall of cornices from towers and high buildings. stones. with considerable ditches.

Fright panic. motor cars. Trees branches, trunks, broken off, especially palm trees. small permanent; wells; temperature waters. (brick) built especially stand ordinary tial wooden houses in some cases; threw panel walls in frame structures, broke off decayed piling. Cracked, walls seriously. extent, also ground on steep slopes. Twisting, monuments, towers. turned, very heavy furniture.

ously. (masonry) structures to withstand earthquakes: Threw out of plumb some wood-frame houses built especially great buildings, it difficult to stand.

up.

buildings construction, in well-built ordinary build-

Shook down loosened brickwork

(sometimes damaging roofs).

amounts.

Damage slight in structures

earthquakes.

substantial buildings, collapse:

to withstand in all--general Some,

Incaving to some extent

designed buildings, walls (especially where

Ejected sand and mud in Changes: in flow of springs wells renewed flow; of spring

broke, Wet ground to some

of chimneys, columns, also conspicuously, over-

substantial some collapse etc.

stucco.

heavy furniture, breaking. Damage

considerable built alarm, or Noticed motor

earthquakes;

(masonry)

in large all many,

cars.

etc.

walls.

in X.

XI.

B9

part; or wholly shifted frame buildings off foundations, to reservoirs; underground pipes sometimes broken.

Cracked ground, especially when and wet, inches; fissures up to a yard in width ran parallel to banks. river Shifted sand and mud horizontally on beaches and flat land. Changed level of water in wells. of canals, serious to dams, Severe to well-built wooden structures and bridges, some destroyed. dangerous walls. frame tions. Tore lines buried in earth. and broad wavy ments and asphalt road surfaces.

Disturbances widespread, material. and land Ejected water in large amounts charged with sand and mud. ("tidal" waves) tude. structures, centers. ments often for long if any standing. bridges by the wrecking of supporting piers, or pillars. wooden rails greatly, and thrust wise. completely out of service.

of construction damaged greatly or destroyed. Disturbances in ground and cracks. significant character, slumping of river banks, Wrenched loose, masses. with offset displacements. surface and lakes, rivers, etc. surfaces some cases). Distorted lines of and level. Threw objects upward into the air.

lakes, rivers, etc. Damage

cracks Destroyed structures, also their founda-Bent railroad rails slightly. apart, or crushed endwise, pipe

in varying Broad fissures, earth slumps, slips

Damage especially Great to dams, dikes, embank-

(masonry) structures remained Destroyed large well-built

Put pipe lines buried in earth

varied, Landslides, falls of rock

Fault notable horizontal and vertical

and underground, modified produced waterfalls, deflected Waves seen (actually seen, probably, in racked frames; serious

to widths of several

Threw water on banks

folds in cement pave-

in soft, wet ground.

less.

tore off, large rock slips

in excellent brick most masonry

distances.

coasts.

embankments.

Bent railroad them end-

extensive.

APR. APR. APR. APR. APR. APR. APR. 11 APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. 12 APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. 18 APR. APR. APR. APR. 21 APR. 21 APR. 22 APR. 23 APR. 23 APR. APR. 25 APR. 25 APR. APR. 28 APR. 29 APR. 30 MAY HAY MAY MAY MAY MAY MAY MAY MAY

16 46 11· 3 16 08 53.0 04 44 04-2 17 12 59-9 10 47 02-9 18 12 56.4 05 12 55.1 01 56 28.4 03 42 03.5 03 48 55.6 04 16 05.7 04 20 40.0 04 26 56.5 04 47 16.6 05 ~2 28.9 08 56 19.2 09 33 38.2 10 40 43-8 22 07 06.4 13 59 58.6 18 27 10.2 08 08 44-4 17 33 14.7 18 09 50.6 08 49 17.6 09 50 52.2 20 36 18.2 05 49 51.1 02 18 08.3 20 40 32.4 01 49 03.5 14 52 18. 1 03 56 30.4 10 01 17.0 20 40 3 7. 7 13 24 04.8 08 24 51.3 11 00 08.0 04 28 47.0 00 21 31.3 07 36 06.2 01 41 17.3 02 52 58.8 17 30 31.3 11 47 52.1 04 10 51.1 06 57 44.7 05 32 47.4 14 05 24.7 00 23 37.6 12 16 03-9 14 59 47.8 16 00 37.3 13 43 53.7 19 56 48.9 01 11 36.0 08 45 33-8 00 42 41.9 Table I.-Summary of U.S. earthquakes for April-June 1978

62.55 N. 62.18 N. 64.08 N. 60.69 N. 63.07 N. 58.29 N. 53.53 N. 63.13 N. 56.42 N. 56.74 N. 56.50 N. 57.69 N. 56.63 N. 56.35 N. 56.46 N. 56.37 N. 56.58 N. 55.86 N. 61.82 N. 56.17 N. 56.36 N. 60.30 N. 61.76 N. 61.96 N. 59.50 N. 56.66 N. 62.95 N. 54.15 N. 56.37 N. 56.51 N. 60.14 N. 61.00 N. 53.68 N. 60.00 N. 151.83 w. 64.53 N. 56.48 N. 62.39 N. 53.69 N. 51.64 N. 58.22 N. 60.05 N. 56.57 N. 57.29 N. 63.81 N. 148. 74 vl. 60.35 N. 147-91 w. 51.25 N. 61.58 N. 63.30 N. 62.97 N. 51.67 N. 62.25 N. 62.18 N. 53.92 N. 62.20 N. 54.34 N. 163.91 w. 62.00 N. 53.03 N. 63.06 N. 149.17 w. 148.79 w. 148.65 w. 151.84 w. 150.64 w. 151.67 w. 163.73 w. 149.92 w. 152.69 w. 153.64 w. 152.53 w. 152.62 w. 152.63 w. 152.56 w. 152.58 w. 152.54 w. 152.84 w. 151.90 w. 147.02 w. 152.17 w. 152.86 w. 151.27 w. 141.09 w. 141. 13 w. 152.72 w. 152.76 w. 143.44 w. 163.96 w. 152.84 w. 152.70 w. 153.54 w. 146.49 w. 163.64 w. 147-95 w. 152.82 w. 151.21 w. 167.05 w. 176.09 w. 155.51 w. 153.46 w. 152. 72 w. 152.70 w.

176.39 E. 151.48 w. 150.97 w. 149.88 w. 176.10 w. 149-40 w. 149.13 w. 164.14 w. 149.22 w.

150.16 w. 170.98 E. 149.24 w.

------------------ mtensity source -------------------

33N 3.6 4.5 4-2 33N 3-8 33N 5.5 6.0 5.2 33N 4. 7 4.6 4-7 4.6 5.1 4.6 5.1 33N 4.4 4.5 33N 4-3 3.5 33N 3.3 33N 3.9 4-9 33N 33N 4.8 33N 4.5

33N 4. 7 33N 4. 1 5.2 33N 3. 7 4.5 33N 4.7 4.3 33N

33N 4.2 5.2 3.2 5.6

33N 4-9 33N 4.4

5.0 4.5A 3.0M III G APR.

2.6A 5.6 5.8A 6.6

4.6A 4.3A 5.IA 5.1M 3.6M 4.5}1 4.5 3.5M 3.IM 3.5M 3.8A 3.8M 3.5M

4.6M 4.2 3.0M 4.0M 4.8A

III G APR. 23 05 P.M. BST 4.8 2.9A

2.8M 4.0 A APR. G APR. G APR. G APR. G APR. G APR. G APR. v G APR. 11 05 P.M. AST G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. A APR. II G APR. IV G APR.

G APR.

G APR. II G APR. 21 10 A.M. AST G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G APR. G MAY IV G MAY G MAY IV G MAY IV G MAY G MAY G HAY G MAY G MAY G MAY G MAY G MAY 2 06 A.M. AST 3 06 A.M. AST 5 06 P.M. AST 9 07 A.M. AST 10 00 A.M. AST 10 08 A.M. AST 10 06 P.M. BST 11 03 P.M. AST 11 05 P.M. AST 11 06 P.M. AST 11 06 P.M. AST 11 06 P.M. AST 11 06 P.M. AST 11 07 P.M. AST 11 10 P.M. AST 11 11 P.M. AST 12 00 A.M. AST 12 12 P.M. AST 13 03 A.M. AST 14 08 A.M. AST 14 10 P.M. AST 15 07 A.M. AST 15 08 A.M. AST 15 10 P.M. AST 15 11 P.M. AST 16 10 A.M. AST 16 06 P.M. BST 17 04 P.M. AST 17 10 A.M. AST 18 03 P.M. AST 19 04 A.M. AST 20 04 P.M. BST 21 00 A.H. AST

22 03 A.M. AST 22 10 P.M. AST 23 00 A.M. BST 24 02 P.M. AST 24 09 P.M. AST 26 03 P.M. AST 27 04 P.M. AST 29 07 A.M. AST 30 01 A.M. AST 30 05 P.M. BST 1 08 P.M. AST 4 07 P.M. AST 8 04 A.M. AST 10 01 P.M. BST 12 02 A.M. AST 12 04 A.M. AST 12 05 A.M. BST 13 03 A.M. AST 15 08 A.M. BST 15 03 P.M. AST 16 09 P.M. BST 20 02 P.M. AST

MAY MAY MAY MAY MAY MAY t-M.Y MAY MAY MAY MAY

t-1AY MAY MAY MAY MAY MAY MAY t-IAY t-IAY t-IAY MAY MAY MAY MAY

MAY MAY JUNE JUNE JUNE JUNE JUNE JUNE JUNE JUNE JUNE 10 JUNE 10 JUNE 10 JUNE 11 JUNE 11 JUNE 12 JUNE 12 JUNE 12 JUNE 14 JUNE 18 JUNE 19 JUNE 20 JUNE 21 JUNE 22 JUNE 22 JUNE 22 JUNE 22 JUNE 24 JUNE 24 JUNE 25 JUNE 26 JUNE 27 JUNE 29 JUNE 29 JUNE 29 JUNE 30 Table I.-Summary of U.S. earthquakes for April-June 1978--Continued

14 55 32.8 13 05 47.1 02 25 04.8 06 16 55.4 06 33 17. 6 06 47 25.1 07 19 10.9 07 20 54.4 07 34 05.6 07 40 55.2 07 49 30.6 0819 25.1 08 30 00.4 09 23 56.7 09 25 46.5 09 31 02.6 09 46 14.3 09 53 03.4 11 35 23.7 13 35 16.7 15 01 00.1 18 54 29.8 22 00 22.5 23 49 37.3 10 39 57.4 14 50 09.1 19 02 10.7 06 24 44.6 18 29 25.6 16 23 45.1 20 18 36.7 23 11 07.7 11 32 28.0 11 39 39.6 12 37 47-6 02 49 03.6 22 08 u. 0 08 23 59.6 13 02 03.3 19 35 10.2 05 01 15.7 07 53 20.6 00 26 41.7 07 30 39.3 15 28 41.5 11 27 03.8 19 31 04.1 19 05 03.2 02 30 08.6 02 37 55.5 02 22 07.0 05 14 04.1 OS 41 27-7 10 38 22.6 01 20 42-7 23 17 59.6 01 11 2 g. 9 02 52 56.5 23 40 58.0 06 44 30.6 08 52 33.4 09 10 57.6 18 13 23.7 56.36 N.

51. 78 N.

57.80 No 156.20 w. 51.23 N. 51.14 N. 51.46 N. 51.15 N. 51.27 N. 51.23 N. 51.58 No 179-15 w. 51.31 N. 51.16 N. 58.54 N. 51.20 N. 51.38 N. 54.23 N. 51.38 No 179.40 w. 51.13 N. 51.27 N. 60.85 N. 51.72N. 51.45 N.

51. 14 N.

51.24 N. 64.55 No 60.55 N. 52.13 N. 60.08 N. 61.36 N. 54.20 N. 51.34 N. 56.21 No 58.91 N. 62.99 N. 59.93 N. 60.10 N. 52.38 N. 57.92 N. 62.99 N. 60.30 N. 62.13 N. 58.84 N. 58.56 N. 59.86 N. 61.03 N. 61.63 No 149-51 w. 62.65 N. 51.66 N. 56.87 N. 57.29 N. 61.50 N. 63.12 No 150.81 w. 51.61 N. 51.91 N. 175. 22 \T. 51.28 N. 58.61 N. 62.12 N. 57.61 N. 55.82 N. 61.34 N. 62.91 N. 150.91 -1. 119 52.76 N. 61.84 N. ALASKA--Continued 152.58 w. 176.88 w.

179.21 w. 179.07 w. 179-44 w. 179.38 w. 179.27 w. 179.27 w. 179.16 w. 178.86 w. 150.38 w. 179.18 w. 179.08 w. 160.55 w.

179.20 w. 179.38 w. 147.24 w. 179-16 w. 179.42 w. 179.29 w. 179.30 w. 152.59 w. 150.70 w. 169.53 w. 153-42 w. 149.70 w. 162.45 w. 177.19 E. 154.59 w. 153. 72 w. 150.42 w. 152. so v1. 146.45 w. 168.67 w. 156.72 w. 149.14 w. 146.45 w. 148.99 w. 151.46 w. 142.90 w. 150.76 w. 148.53 w. 151.21 w. 174.20 w. 157.09 w. 152.86 w. 149.35 w.

179.41 w. 178.95 w. 150.60 w. 151.24 w. 169.92 w. 154.40 w. 150.74 w. 173.31 w. 147 151.92 w.

33N 5.0 33N 4.5 33N 4-5 33N 4.9 33N 4.2 33N 4.3 33N 4.5 33N 3.9 33N 33N 4-8 33N 4-3 33N 4.0 33N 4.2 33N 5.2 33N 4. 1 33N 33N 3. 9 33N 4.8 33N 4. 2 33N 4-5 33N

33N 4-8 33N 4-3

Bll

4. OM 3.5M

4.1 3.9 4.6M 4- 7M

4. 6M

G MAY G MAY G MAY IV G t-1AY G MAY G MAY G MAY G MAY G t-1AY G MAY G MAY G MAY G MAY G MAY G MAY G MAY G MAY III G MAY G MAY G MAY G MAY G MAY G MAY G MAY IV G MAY G MAY G MAY G MAY II G MAY G JUNE G JUNE G JUNE G JUNE G JUNE G JUNE G JUNE G JUNE II G JUNE G JUNE IV G JUNE 10 09 A.M. AST G JUNE G JUNE G JUNE III G JUNE 11 09 P.M. AST G JUNE G JUNE G JUNE G JUNE G JUNE G JUNE G JUNE G JUNE III G JUNE 21 06 P.M. BST G JUNE G JUNE G JUNE G JUNE G JUNE G JUNE G JUNE G JUNE G JUNE G JUNE 21 04 A.M. AST 22 02 A.M. BST 22 04 P.M. AST 23 07 P.M. BST 23 07 P.M. BST 23 07 P.M. BST 23 08 P.M. BST 23 08 P.M. BST 23 08 P.M. BST 23 08 P.M. BST 23 08 P.M. BST 23 09 P.M. BST 23 10 P.M. AST 23 10 P.M. BST 23 10 P.M. BST 23 11 P.M. AST 23 10 P.M. BST 23 10 P.M. BST 24 00 A.M. BST 24 03 A.M. AST 24 04 A.M. BST 24 07 A.M. BST 24 11 A.M. BST 24 12 P.M. BST 25 00 A.M. AST 27 04 A.M. AST 28 08 A.M. BST 28 08 p.M. AST 31 08 A.H. AST 2 OS A.M. BST 3 09 A.M. BST 3 01 P.M. AST 4 01 A.M. AST 6 01 A.M. AST 7 02 A.M. AST 7 04 P.M. AST 9 11 A.M. BST 9 10 P.M. AST 10 03 A.M. AST 10 07 P.M. AST 10 09 P.M. AST 11 02 p.M. AST 12 05 A.M. AST 14 01 A.M. AST 18 09 A.M. AST 19 08 A.M. BST 19 04 P.M. AST 20 04 P.M. AST 21 04 P.H. AST 21 07 P.M. AST

21 11 P.M. BST 23 02 P.M. BST 24 01 P.M. AST 24 03 P.M. AST 25 03 P.M. BST 27 01 P.M. AST 28 08 P.M. AST 28 10 P.M. AST 28 10 P.M. BST 30 08 A.M. AST

APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. APR. MAY MAY MAY MAY MAY MAY HAY MAY MAY .HAY MAY MAY MAY MAY HAY MAY MAY MAY I-KAY MAY MAY MAY HAY HAY

t1AY HAY HAY JUNE JUNE JUNE JUNE 11 JUNE 11

10 52 2 7. 4 13 14 23.5 18 13 oo.s 03 23 31.8 23 38 01.7 09 22 16.5 16 00 41-1 11 39 42.4 23 17 06. 5 02 07 39.3 17 22 35.2 04 13 28.0 10 01 05.2 15 00 33.9 12 38 18. 7 00 21 23.6 03 43 07.1 08 54 18.6 17 11 39.6 22 42 36.2 01 38 17. 7 04 19 50.8 13 04 2 7. 8 01 32 59.7 04 58 38.2 OS 13 25.3 21 56 30.2 22 06 32.4 06 08 21-9 03 32 11.8 04 03 46.2 08 02 54.4 18 24 40.2 06 17 29.4 10 37 04.8 09 17 02-3 10 14 14.9 01 07 02-4 06 56 23-3 15 55 40.5 OS 47 32.4 11 56 05.6 11 56 56.6 12 18 u.s 12 28 03.5 17 57 40.6 00 27 47.6 15 49 24.5 00 45 16.8 05 50 57.0 21 56 06.9 22 01 58.2 OS 01 16-5 09 16 so.s 20 14 10. 3 06 43 as. 9 14 12 39.4 18 22 41.3 OS 16 49.2 11 44 45.2 03 57 17-3 16 03 03.8 23 48 52.3 19 08 26.0 20 12 03-9 34.20 N. 37.50 N. 41.47 N. 37.84 N. 40.42 N. 39.14 N. 35.38 N. 32.88 N. 36.21 N. 36.22 N. 40.28 N. 32.82 N. 35.28 N.

36. 75 N.

34.37 N. 34.25 N. 117.08 w. 35.93 N. 39.66 N. 39.68 N. 33.88 N. 39.67 N. 39.67 N. 34.05 N. 39.71 N. 33.00 N. 33.00 N. 33.72 N. 33.98 N. 33.95 N. 33.83 N. 34.23 N. 116.57W. 34.37 N. 33.95 N. 32.85 N. 32.85 N. 37.47 N. 37.47 N. 36.83 N. 37.37 N. 37.38 N. 34.00 N. 37.37 N. 3T. 3 7 N. 37.38 N. 37.38 N. 34.00 N. 37.38 N. 33.48 N. 41.45 N. 40.45 N. 36.64 N. 36.64 N. 32.70 N. 33.90 N. 33.90 N. 34.15 N. 32.87 N. 38.54 N. 32.87 N. 32.87 N. 33.92 N. 33-42 N. 35.87 N. 41.44 N. 41-44 N.

------------------ mtensity source -------------------

CALIFORNIA 116. 97 w. 118.77 w. 121.85 w. 122.06 w. 124.41 w. 123.19 w. 118.63 w. 115.52 w. 118.36 w. 120.10 w. 124.19 w. 115.45 w. 116.83 w. 121.50 w. 118.67 w.

ll8.22 w. 122. 77 w. 122.79 w. 117.55 w. 122.76 w. 122.75 w. 118.97 w. 122.64 w. 115.58 w. 115. 58 w. 118. 37 w. 116. 93 w. 118.30 w. 117.73W.

119.97W. 118. 75 H. 115.42 w. 115.42 w. 118.56 w. 118.57 w. 120.03 w. 121.75 w. 121.75 w. 118.35 w. 121.76 w. 121.76 w. 121.75 w. 121.75 w. 118.45 w. 121.76 w. 116.43 w. 121.88 w. 123. 29 ~J. 121.31 w. 121.31 w. 115.37 w. 119.17 VJ. 119.17VJ. 116.72 w. 115.48 VJ. 122.74 VJ. 115.48 w. 115.48 w. 117.83 w. 116. 70 w. 117.37 w. 121.88 H. 121.89 w.

B12

3.9 4.2P 3.1B 3.SB

2. SB

3.6B 3.2B 3.0P 3.1P 3.SB 3.0B 3.4B 3.1P 3.7P 3.1B 3.Qp 3.Qp 3.SB 3.2B 3.2B 3.Qp

2. 9B

2.4P 2.3P 2.5P 3.1P

2. 7P

3.2P 3.8P 3.7P 3.Qp 3.2P 3.1P 3.5B 3.7B 3.3B 3.4B 3.3B 2.8P 3.8B 3.8B

3. 7B

3.4B 2.9P 3.0B 3.0P 3.1B 3.0B 3.7B 2.9B 3.4P 3.9P 3.2P 3.3P 3.0P 3.8B

2. 7P

2-9P 3.SP 4-4P 3.4P 3.2B 3.SB v p APR.

B APR.

B APR.

B APR.

B APR.

IV G APR.

p APR.

p APR.

G APR.

G APR.

B APR.

p APR.

II p APR.

B APR.

p APR.

p APR.

G APR.

B APR.

B APR. 18 09 A.M. PST II p APR.

B APR.

B APR. III p APR.

G APR.

II p APR. 24 08 P.H. PST II p APR. II p APR.

p APR.

p APR. III p APR.

v p APR. 28 08 p.M. PST IV p MAY p MAY p MAY p :M..AY

B MAY IV B HAY II B MAY III B :t-'f...AY III B MAY III p MAY IV B MAY IV B MAY IV B MAY IV B MAY III p MAY B MAY p HAY B MAY B MAY II B MAY II B MAY p MAY IV p MAY p MAY p MAY p HAY II B HAY p MAY II p MAY v p JUNE v p JUNE p JUNE B JUNE 11 11 A.M. PST II B JUNE 11 12 P.M. PST 1 02 A.M. PST 1 OS A.M. PST 1 10 A.M. PST 3 07 P.M. PST 4 03 P.M. PST 8 01 A.M. PST 9 08 A.M. PST 11 03 A.M. PST 11 03 P.M. PST 11 06 P.M. PST 12 09 A.M. PST 13 08 p.M. PST 14 02 A.M. PST 14 07 A.M. PST 15 04 A.M. PST 16 04 P.M. PST 16 07 P.M. PST 18 00 A.M. PST 18 02 P.M. PST 18 05 P.M. PST 18 08 P.M. PST 22 OS A.M. PST 24 OS P.M. PST

24 09 P.M. PST 25 01 P.M. PST 25 02 P.M. PST 25 10 P.M. PST 28 07 p.H. PST

1 00 A.M. PST 1 10 A.H. PST 1 10 p.H. PST 2 02 A.M. PST 6 01 A.H. PST 6 02 A.tf. PST 7 05 P.H. PST 7 10 P.M. PST 10 07 A.M. PST 10 09 p.H. PST 11 03 A.M. PST 11 03 A.M. PST 11 04 A.M. PST 11 04 A.M. PST 11 09 A.M. PST 11 04 P.M. PST 12 07 A.M. PST 16 04 P.M. PST 19 09 p.M. PST 22 01 P.M. PST 22 02 p.M. PST 22 09 P.H. PST 23 01 A.M. PST 23 12 p.M. PST 24 10 P.M. PST 26 06 A.M. PST 27 10 A.M. PST 30 09 P.M. PST 31 03 A.M. PST 3 07 P.M. PST 5 08 A.M. PST 8 03 P.M. PST

JUNE 12 JUNE 12 JUNE 12 JUNE 12 JUNE 14 JUNE 14 JUNE 16 JUNE 17 JUNE 21 JUNE 22 JUNE 25

APR. APR. APR. APR. MAY MAY }fAY MAY MAY JUNE JUNE 18 JUNE 19 JUNE 29 JUNE 29 JUNE 29

APR. APR. APR. APR. APR. MAY MAY MAY MAY

MAY JUNE JUNE JUNE JUNE 11 JUNE 12 JUNE 13 JUNE 13 JUNE 16 JUNE 18 JUNE 20 JUNE 21 JUNE 22 JUNE 23 JUNE 23 JUNE 30 JUNE 30 Table I.--Summary of U.S. earthquakes for April-June 1978--Continued

03 03 35.2 03 22 2 g. 1 06 17 34.3 09 18 44.1 04 27 49.4 19 44 33.4 04 21 31.9 22 31 24.2 19 26 os.o 06 04 29.2 07 31 11.4

13 46 57.8 08 34 23.0 09 42 14.6 20 15 11.5 07 49 29.6 18 30 25.0 16 34 19.2 21 42 02.9 00 46 35.1 18 38 20.9 23 04 52.7 12 so 54.1 11 28 10.4 11 42 25.1 11 45 04.2

04 28 32.9 13 47 14. 1 02 43 44.2 19 35 28.0 06 55 12.7 17 29 06.4 00 23 57.9 06 45 42.1 07 09 26.7 13 59 15.4 13 41 03.0 OS 16 44.8 01 02 02.1 08 00 44.9 06 07 44.7 21 57 12. 1 02 49 35.0 16 54 01.2 08 22 19.8 03 34 23.7 09 36 53.5 10 20 44.1 04 49 ss.o 08 03 29.7 11 47 58.6 04 31 10.9 22 28 02.8 41.46 N. 40.92 N. 36.09 N. 41.46 N. 34.38 N.

33.50 N. 35.03 N. 35.82 N. 35.28 N. 36.95 N. 34.05 N.

33.37 N. 40.31 N. 40.38 N. 41.57N. 41.57 N. 40.37 N. 40.31 N. 40.44 N. 40.39 N. 40.34 N. 40.31 N. 40.28 N. 41.54 N. 41.91 N. 41.63 N.

39.28 N. 39.78 N. 104.87 w.

19.30 N.

19. 33 N.
20. 83 N.

19.33 N. 19.34 N. 19.29 N. 19.32 N. 19.36 N. 19.31 N. 19.35 N. 19.65 N. 20.30 N. 19.67 N. 19.81 N. 19.33 N. 19.40 N. 18.90 N. 19.34 N. 19.05 N. 19.34 N. 20.67 N. 19.32 N. 19.03 N. 19.13 N.

19. 32 N.

19.36 N. 19.17 N.

------------------ intensity source -------------------

121.86 w. 121.96 w. 118.44 w. 121.86 '-l. 118.63 w. 116.78 w. 119. 13 w. 116.47 w. 118.57 w. 121.45 w. 117.27W.

CALIFORNIA--OFF THE COAST 119. 08 -J. 127.27 H. 126.48 w. 125.61 w. 125.80 w. 125.10 w. 124.57 w. 124.85 w. 126.20 w. 124.84 w. 125.29 w. 124.35 w. 127.43 w. 127.55 w. 127.13 w.

COLORADO 107.32 w.

HAWAII 155.19 w. 155. 13 l~. 10 155.14 w. 155. 12 w. 155.07 w. 155.50 w. 155. 11 w. 156.31 w. 155.22 w. 155.03 w. 156.02 w. 155.74 w. 155.16 w. 155.79 w. 155. 11 w. 155.26 w. 155.46 w. 155.05 w. 156.83 w. 155.02 w. 155.76 w. 155.22 w. 156.78 w. 156.38 w. 155.26 w. 155.12 w. 155.48 w.

Bl3

3. 3B 3.4B 3.8B 2.9P
4. 1P 2.8B 3.1P
5. 7B
6. 7B
7. 8B 4.2B 4.0B
8. 7B 4.4B
9. 8B 4.0B 4.2B
10. 1B
11. 9G

3.0H 3.2H 3.6H 3.1H 3.4H 3.1H 3.0H 3.0H 3.4H 3.3H 3.0H 3.1H 3.2H 3.0H 3.0H 3.0H 3.4H 3.1H 3.0H 3.0H 3.3H 3.4H 3.1H 3.1H 4.2H 3.0H 3.1H B JUNE 11 07 p.~1. PST G JUNE 11 07 P.M. PST G JUNE 11 ·10 P.M. PST II B JUNE 12 01 A.M. PST II p JUNE 13 08 P.M. PST p JUNE 14 11 A.M. PST v p JUNE 15 08 P.M. PST p JUNE 17 02 P.M. PST p JUNE 21 11 A.M. PST B JUNE 21 10 P.M. PST II p JUNE 24 11 P.M. PST

p APR.

G APR.

B APR.

B APR.

B MAY B MAY B MAY IV B MAY B MAY IV B JUNE B JUNE 18 03 P.M. PST B JUNE 19 04 A.M. PST B JUNE 29 03 A.M. PST B JUNE 29 03 A.M. PST G JUNE

G MAY IV G JUNE 10 01 P.M. MST

III H APR. III H APR.

IV H APR.

H APR.

IV H APR.

IV H HAY H MAY H MAY IV H MAY H MAY H MAY H MAY IV H JUNE IV H JUNE H JUNE IV H JUNE 12 11 A.M. HST IV H JUNE 12 04 P.M. HST IV H JUNE 13 06 A.M. HST H JUNE H JUNE 17 OS P.M. HST H JUNE III H JUNE 21 00 A.M. HST H JUNE 21 06 P.M. HST H JUNE 22 10 P.M. HST IV H JUNE 23 01 A.M. HST H JUNE 29 06 P.~1. HST III H JUNE 30 12 P.M. HST 3 OS A.M. PST 11 00 A.M. PST 19 01 A.M. PST 24 12 P.M. PST 4 11 P.M. PST 10 10 A.H. PST 21 08 A.M. PST 23 01 P.M. PST 28 04 P.M. PST 1 10 A.H. PST

29 03 A.M. PST

29 09 A.M. MST

2 06 P.M. HST 6 03 A.M. HST 7 04 P.M. HST 12 09 A.M. HST 12 08 P.M. HST 3 07 A.M. HST 10 02 P.M. HST 15 08 P.M. HST 22 09 P.M. HST 24 03 A.M. HST 27 03 A.M. HST 31 07 P.M. HST 2 03 P.M. HST 4 10 P.M. HST 10 08 P.M. HST

15 10 P.~1. HST

19 11 P.M. HST

APR. APR. APR.

APR.

APR.

APR. APR. APR. MAY

APR. APR. APR. APR. APR. MAY JUNE

JUNE 30 JUNE 30

APR.

APR. APR. JUNE Table I.--Summary of U.S. earthquakes for April-June 1978--Continued

07 31 55.9 15 30 00.2 17 45 00.1 13 15 47.3 13 18 44.5 05 47 55.4 17 00 oo.o

15 29 23.1 20 10 02.4 01 03 45.3 44.05 N. 42.66 N. 43.91 N.

38.42 N.

39.70 N.

32.09 N.

36.62 N.

45.30 N. 46.97 N. 47.00 N. 4.7.00 N.

42.30 N.

40.06 N. 3 7. 30 N. 37.23 N. 35.80 N. 35.80 N. 40.87 N. 37.03 N.

41.07 N. 41.08 N.

35.33 N. 35.50 N. 35.60 N.

42.76 N. 44.55 N. 42.70 N. 116.36 w. 111.55 w. 114. 11 w.

88.46 w.

78.24 w.

MISSISSIPPI 88.58 w.

90.00 w.

110.26W. 113.27 w. 113.31 w. 113.31 w.

101.93 W.

116.42 w. 116.33 w. 116.37 w. 114. 90 w. 114.90 w. 117.26W. 116. 04 vl.

NEW JERSEY 74.20 w. 74.20 w.

74.24 w.

97.91 w.

97.50 w.

97.83 w.

OREGON--OFF THE COAST 126.67 w. 127.24 w. 126.29 w.

Bl4

3.9 4.3 3.2G 2.5G 3.1G

2.8G 4.9G 3.7G 3.2G

5. 3B
6. 4G

2.3T 2.1T IV G APR. IV G APR.

G APR.

G APR.

S APR.

G APR.

v G APR. 23 04 P.M. MST II G APR.

G APR.

E APR.

E APR.

II G APR.

II G APR.

v G MAY 22 09 P.M. PST G JUNE

IV L JUNE 30 03 P.M. EST III L JUNE 30 05 P.M. EST

L APR.

I T MAY III T MAY

G APR.

G APR.

G JUNE 3 02 A.M. PST 20 07 A.M. MST 25 11 P.M. PST

26 02 P.lt. EST

9 05 P.M. CST

3 06 A.M. CST

14 02 A.M. MST 23 04 P.M. MST 19 03 A.M. MST

7 10 A.M. CST

9 11 P.M. PST 11 07 A.M. PST 11 09 A.M. PST 20 05 A.M. PST 20 05 A.M. PST

1 09 A.M. PST

5 09 A.M. EST

17 05 P.M. CST 17 06 P.M. CST 18 06 P.M. CST

15 07 A.M. PST 23 12 P.M. PST 17 05 P.M. PST

APR. JUNE JUNE JUNE JUNE 18 JUNE 19

Table 2.--Summary of macroseismic data for U.S. earthquakes,

9 April (G) Kenai Origin time: Epicenter: Depth: Magnitude: In tensity III: Intensity II:

12 April (G) Kodiak Origin time: Epicenter: Depth: Magnitude:

Intensity V:

Intensity IV:

Intensity III:

Intensity II: 06 36 22.7

Island region Table I.--Summary of U.S. earthquakes for April-June 1978--Continued

17 12 59.9 60.69 N. 9 151.84 W. 101 km 4.5 mb Anchorage (M) 9 Kenai (M). Homer (M).

03 42 03.5 56.42 N. 9 152.69 W. 14 km 6.0 mb, 6.6 MS, 6.5 MS{B), 6.3 MS{P) 9 5.8 ML(A) Sitkinak Island. Kodiak 9 Old Harbor (M). Ouzinkie. Olga Bay {M), Zechar Bay 34.39 N.

33.03 N.

46.86 N.

42.72 No 110.88 w. 43.63 N. YELLOWSTONE NAT. PARK YELLOWSTONE NAT. PARK YELLOWSTONE NAT. PARK YELLOWSTONE NAT. PARK 81.32 w.

100.77 W.

120.96 W.

107.83 w. SOUTH CAROLINA

BlS

Table 2.-Summary of macroseismic data for U.S. earthquakes,

19 April (G) Southern Alaska Origin time: Epicenter: Depth: Magnitude: Intensity II:

19 April (G) Southern Alaska Origin time: Epicenter: Depth: Magnitude: Intensity IV:

21 April (G) Central Origin time: Epicenter: Depth: Magnitude: Intensity II:

24 April (G) Andreano£ Islands, Aleutian Origin time: Epicenter: Depth: Magnitude: Intensity III: Adak. 2.6v

3. 7G

Alaska--Continued G APR.

V G JUNE 16 05 A.M. CST

II W JUNE 26 06 P.M. PST

II G APR.

G JUNE IV III III IV

01 49 03.5 60.14 N. 9 153.54 W. 158 km 4.6 mb Anchorage (M).

14 52 18.1 61.00 N- 9 146.49 w. 40 km

Valdez (M).

Alaska 20 40 37-7 64.53 N., 147.95 W. 30 km 3.7 ML(M) College (M).

04 28 47.0 51.64 N., 176.09 w. 53 km 5.2 mb 9 4.8 MS 22 01 A.M. EST

14 10 P.M. MST JUNE JUNE JUNE 18 03 P.M. MST JUNE 18 10 P.M. MST 6 02 P.M. MST 7 05 A.M. MST 8 08 A.M. PST

Islands Table 2.--Summary of macroseismic data for U.S. earthquakes,

5 May (G) Southern Origin time: Epicenter: Depth: Magnitude: Intensity IV:

Intensity III:

11 May (G) Andreano£ Origin time: Epicenter: Depth: Magnitude: Intensity IV:

12 May (G) Central Origin time: Epicenter: Depth: Magnitude:

Felt throughout the Susitna Valley (press

Intensity IV:

Intensity III: Fairbanks (M).

Intensity II:

24 May (G) Andreano£ Origin time: Epicenter: Depth: Magnitude:

Intensity IV:

24 May (G) Andreano£ Origin time: Epicenter: Depth: Magnitude: Intensity III:

25 May (G) Central Alaska Origin time: Epicenter: Depth: Magnitude: Intensity IV:

31 May (G) Southern Alaska Origin time: Epicenter: Depth: Alaska--Continued

report).

dorf AFB, Gakona, Girdwood, Glennallen, Gold Creek (M), Homer, Kashwitna (M), McKinley Park, Palmer (M), Skwentna, Talkeetna, Wasilla (M), Whittier. OS 32 47.4 63.30 N., 150.97 W. 134 km 5.2 mb Skwentna, Talkeetna, Willow

Anchorage to Palmer (M).

Islands, Aleutian Islands 00 23 3 7. 6 51.67 N., 176.10 W. 59 km 5.6 mb, 5.9 MS, 5.8 MS(B) Adak (M).

12 16 03.9 62.25 N., 149.40 W. 67 km 5.1 mb

Ester, Moose Pass.

Islands, Aleutian Islands 06 16 55.4 51.23 N., 179.21 W. 25 km 6.0 mb, 6.7 MS, 6.4 mb(P), 6.2 MS(P), 6.4 MS(B) Adak (M).

Islands, Aleutian Islands 09 53 03.4 51.13 N., 179.20 W. Normal. 5.2 mb, 5.4 MS Adak.

10 39 57.4 64.55 N•' 152.59 w. Normal.

4. 0 l-1L

Tanana.

18 29 25.6 61.36 N.' 14 9. 70 w. 44 km

Bl6

Table 2.--Summary of macroseismic data for U.S. earthquakes,

10 June (G) Alaska

10 June (G) Southern

12 June (G) Kenai Peninsula, Alaska

22 June (G) Andreano£ Islands, Aleutian Islands

5 May (P) Baja California

April (P) Southern California Alaska--Continued

Magnitude: Intensity II:

Origin time: Epicenter: Depth: Hagnitude: Intensity II : Intensity I:

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

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

Origin time: Epicenter: Depth: Magnitude: Intensity III: Adak (U).

Origin time:

See California listing.

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

City, Llano, Rosamund. Intensity IV:

Bryn Mawr, Cedar Glen, Coachella, Fawnskin, Forest Falls, Green Valley Lake, Highland, Lorna Linda, Lucerne Valley, Redlands, Running Springs, Sunnymead, Yucaipa. Intensity III:

3.0 ML(M)

Palmer (U).

Peninsula 08 23 59.6 57.92 N., 156.72 W. 10 km 4.5 mb, 3.9 MS, 4.6 ML(M) Egegik 0-1) .• King Salmon (M) •

Alaska 19 35 10.2 60.30 N., 146.45 W. 20 km 4.8 mb, 4.7 ML(M) Cordova (M) • Anchorage (M), Valdez (M).

07 30 39.3 59.86 N., 150.76 w. 55 ki!l 4.0 mb

OS 41 27.7 51.61 N., 179.41 w. Normal. 4.8 mb, 5.9 MS, S.O ML(M)

10 52 27.4 34.20 N., 116.97 w. 6 km 4.2 HL, 3.8 mb(G) Angelus Oaks, Big Bear

Big Bear Lake, Blue Jay,

Palm Springs. Table 2.-Summary of macroseismic data for U.S. earthquakes. April-June 1978--Continued

4 April (B) Northern California Origin time: Epicenter: Depth: Magnitude: Intensity II: (B).

8 April (B) Northern California Origin time: Epicenter: Depth: Magnitude: Intensity IV: Intensity III: Redwood Valley, Ukiah.

14 April (P) Central Origin time: Epicenter: Depth: Magnitude: Intensity II:

18 April (P) Southern California Origin time: Epicenter: Depth: Magnitude: Intensity II:

22 April (P) Southern California Origin time: Epicenter: Depth: Magnitude: Intensity III: Malibu to Point Dume (P).

25 April (P) Imperial Valley region Origin time: Epicenter: Depth: Magnitude: Intensity II:

25 April (P) Imperial Valley region Origin time: Epicenter: Depth: Magnitude: Intensity II:

25 April (P) Southern California Origin time: Epicenter: Depth: Magnitude: Intensity II: 03 23 31.8 37.38 N., 122.06 W. 8 km. 2.5 ML Alamo (B), Walnut Creek

09 22 18.9 39.19 N., 123.14 w. 5 km 3.2 ML Talmage, Willits.

California 10 01 05.2 35.28 N., 116.83 W. 5 km 3.7 ML Goldestone Tracking Station.

22 42 36.2 33.88 N., 117.55 w. 6 km 3.0 ML Corona, Riverside.

13 04 27.8 34.05 N., 118.97 w. 14 km 3.4 mb(G), 3.2 ML

04 58 38.2 33.00 N., 115.58 w. 11 km 2.4 ML Brawley (P).

OS 13 25.3 33.00 N., 115.58 w. 9 km 2.3 ML Brawley (P).

21 56 30.2 33o 72 No' 118.37 w. 4 km 2.5 ML Long Beach (P).

Bl7

Table 2.-Summary of macroseismic data for U.S. earthquakes.,

26 April (P) Southern California

29 April (P) Southern California

29 April (P) Southern California

5 May (P) Baja California

May (B) Owens Valley region April-June 19 78--Continued

Origin time: Epicenter: Depth: lfagnitude: Intensity II:

(P), Northern Orange County (press report), Santa Monica (P).

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

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

Riverside. Intensity III: Helendale, Orange, Santa Ana. Intensity II:

report), Big Bear (P), Tustin (press report).

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

Origin time: Epicenter: Depth: Magnitude:

Intensity IV:

Arizona--San Luis, Yuma.

California--Calexico, Del Mar, Campo, El Centro, Heber, Ocotillo, Potrero, Seeley. Intensity III:

California--Plaster City, San Diego.

Origin time: Epicenter: Depth: Magnitude: Intensity IV: 06 08 21.9 33.95 N., 118.30 w. 5 km

2. 7 ML

Hawthorne (P), Los Angeles

03 32 11.8 33.83 N., 117.73 w. 5 km 3.2 ML Santa Ana, Villa Park (P).

04 03 46.2 34.23 N., 116.57 w. 6 km 3.8 ML Landers. Fawnskin, Lake Arrowhead,

08 02 54-4 34.37 N., 119.97 W. 5 km 3.7 ML Goleta, Santa Barbara.

21 03 1 S. 8 32.22 N., 115.32 w.

4.8 mb(G), 4.1 MS(G), S.S ML

10 14 14.9 37.47 N., 118.57 w. 8 km 3.7 ML Bishop. Table 2.-Summary of macroseismic data for U.S. earthquakes,

8 May (B) Central Origin time: Epicenter: Depth: Magnitude: Intensity II:

8 May (B) Central Origin time: Epicenter: Depth: Magnitude:

This earthquake is the beginning of a swarm

Intensity III:

10 May (B) Central California Origin time: Epicenter: Depth: Magnitude: Intensity III: East San Jose (press

11 May (P) Southern California Origin time: Epicenter: Depth: Magnitude: Intensity III: Culver City, Inglewood, Los

11 May (B) Central Origin time: Epicenter: Depth: Magnitude: Intensity IV:

11 May (B) Central Origin time: Epicenter: Depth: Magnitude: Intensity IV:

11 May (B) Central Origin time: Epicenter: Depth: Magnitude: Intensity IV: April-June 1978-Continued

along the Caleveras fault northeast of San Jose.

report).

report).

Angeles, Santa Monica, Southgate. California

California 01 07 02.4 36.83 N., 120.03 W. 9k.m 3.3 ML Madera.

06 56 23.3 3 7. 3 7 N., 121. 75 W. 3 km 3.4 ML

East San Jose (press

15 55 40.5 37.38 N., 121.75 w. 2 k.m 3.3 ML

05 47 32.4 34.00 N., 118.35 w. 5 km 2.8 ML

11 56 05.6 37.37 N., 121.76 W. 3 km 3.8 ML East San Jose.

11 ~6 56.6 37.37 N., 121.76 W. 2 km 3.8 ML East San Jose.

12 18 11.8 37.38 N., 121.75 W. 4 km 3.7 mb(G), 3.7 ML East San Jose.

B18

Table 2.--Summary of macroseismic data for U.S. earthquakes,

11 May (B) Central

11 May (P) Southern

22 May (B) Central

22 May (B) Northern

23 ~fay (P) Southern California

27 May (B) Northern

31 }fay (P) Imperial April-june 1978--Continued

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

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

Santa Monica.

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

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

(B).

Origin time: Epicenter: Depth:

Intensity IV:

(press report), Oxnard (press report), Port Hueneme (press report), Silver Strand Beach. Intensity III: Glendale. Intensity II:

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

County (B).

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

Valley region 12 28 03.5 37.38N., 121.75 W. 4 km 3.4 ML East San Jose.

17 57 40.6 34o 00 No' 118o 45 Wo 5 km 2.9 ML Beverly Hills, Inglewood,

21 56 06.9 36.64 N., 121.31 W. 4 km 3.7 mb(G), 3.5 ML Hollister, Stone Canyon.

22 01 58.2 36.64 N., 121.31 W. 5 km 2.9 ML Hollister (B), Stone Canyon

09 16 50.8 33.90 N., 119.17 w. 5 km 4.0 mb(G), 3.9 ML Compton, Hollywood Beach

Point Mugu.

18 22 41.3 38.54 N., 122.74 W. 9 km 3.8 ML Santa Rosa (B), Sonoma

05 16 49.2 32.87 N., 115.48 w. 10 km 2.7 ML Brawley. Table 2.-Summary of macroseismic data for U.S. earthquakes,

31 May (P) Imperial Origin time: Epicenter: Depth: Magnitude: Intensity II:

4 June (P) Southern California Origin time: Epicenter: Depth: Magnitude:

This earthquake was felt over an area of

Intensity V:

Intensity IV:

Intensity III: Glendora, Glenoaks, Los

Intensity II:

5 June (P) Southern Origin time: Epicenter: Depth: Magnitude:

This earthquake was felt over an area of

Intensity V:

Intensity IV:

approximately 1,700 sq km (fig. 7).

and small objects shifted).

Big Bear City, Bonsall, Brea, Buena Park, Burbank, Costa Mesa, Covina, Cudahy, Cypress, Diamond Bar, Downey, El Segundo, Fawnskin, Fountain Valley, Fullerton, Garden Grove, Gardena, Glendale, Hancock, Ladera Heights, La Habra, Long Beach, Los Angeles, Maywood, Midway City, Monrovia, tfonterey Park, Montrose, Murrieta, Norwalk, Paramount, Pasadena, Placentia, Pomona, San Jacinto, Sierra ~fudre, South Gate, Stanton, Sunset Beach, Vista, West Covina, Westminster, Wildomar, Yorba Linda.

Alamitos, Santa Ana.

Lake, Huntington Beach, Montclair, Phelan, San Gabriel, Van Nuys.

approximately 11,000 sq km (fig. 8).

exterior brick walls, small objects shifted), Winchester (few cracked windows; windows, doors, and dishes rattled).

Bonita, Borrego Springs, Camp Pendleton, El Cajon, Escondido, Guatay, Hemet, Idyllwild, Indio, Jamul, Julian, La Mirada, Laguna Niguel, Lakeside, North Palm Springs, Pala, Palm Springs, Palomar Mountain, Pauma Valley, Pico Rivera, Pine 11 44 45.2 32.87 N., 115.48 W. 10 km 2.9 ML Brawley.

03 57 17.3 33.92 N., 117.83 w. 6 km 3.5 ML

Whittier (light furniture FIGURE 7.--Isoseismal map for the southern Cal-Anaheim, Arcadia, Atwood,

Table 2.--Summary of macroseismic data for U.S. earthquakes,

California 16 03 03.8 33.42 N., 116.70 W. 12 km 3.9 mb(G), 4.4 ML

Anza (hairline cracks in

Aguanga, Alpine, Banning, Intensity III: Boulevard, Del Mar, La

Intensity II:

June (B) Northern California Origin time: Epicenter: Depth: Magnitude: Intensity II:

June (B) Northern California Origin time: Epicenter: Depth: Magnitude: Intensity II:

June (P) Southern California Origin time: Epicenter:

~Avalon

ifornia earthquake of 4 June 1978, 03 57 17.3 urc. Roman numerals represent Modified isoseismals; Arabic numerals are used to represent these intensities at specific sites.

Valley, Pomona, Ramona, Ranchita, San Diego, San Diego NAB, San Marcos, Santa Ysabel, Valley Center, Vista, Warner Springs.

Jolla, Mountain Center, North Shore, Palm Desert, Pico Rivera, Rincon Springs (press report), San Diego--Lindbergh Field, South Whittier.

Lake Elsinore, Mt. Baldy.

20 12 03.9 41.44 N., 121.89 w. 2 km 3.5 ML Mt. Shasta area (B).

09 18 44.1 41.46 N., 121.86 w. 2 km 3.8 ML Mt. Shasta area (B).

04 27 49-4 34.38 N., 118.63 w.

Lagun~ Nigu~l ~I

FIGURE 8.--Isoseismal map for the southern California earthquake of 5 June 1978, 16 03 03.8 UTC. Roman numerals represent Modified isoseismals; Arabic numerals are used to represent these intensities at specific sites.

Depth:

Magnitude:

Intensity II:

16 June (P) Central California Origin time: Epicenter: Depth: Magnitude: Intensity V:

Intensity IV:

Intensity III: Frazier Park, Shafter.

Intensity II:

25 June (P) Southern California Origin time: Epicenter: Depth: Magnitude: Intensity II:

overturned), Pumpkin Center (furniture shifted), Tupman (small objects fell).

(P), New Cuyama, Santa Barbara (P), Saugus. 23 May (B) Northern

10 June (G) Northern Colorado

6 km 2.9 ML Newhall (P).

04 21 31.9 35.03 N., 119.13 w. 5 km The places shown below followed by (H) designate 4.1 mb(G), 4.1 ML, 4.4 ML(B) Mettler (small objects

Fellows, Lebec, Taft.

Buena Vista pumping plant

07 31 11.4 34.05 N., 117.27 w. 5 km 3.1 ML Fontana (P).

B20

intensity values assigned by the Hawaiian Volcano Observatory.

3 April (H) Island of Hawaii

6 April (H) Island of Hawaii California--Off the coast

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

Miranda. Intensity III: Bridgeville, Eel River and Van Duzen River Valleys (press report).

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

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

(1335 Rosemary St, 1680 Hagnolia St, 1603 Clermont St--press report), Thornton (2501 E. 104th St--press report), Henderson (1098 Brighton Road). Intensity III: Commerce City. Intensity II:

Origin time:

Epicenter:

Depth:

Magnitude:

Intensitx III:

Origin time:

Epicenter:

Depth:

Magnitude:

Intensitx III: Hila (H) • 21 42 02.9 40.44 N., 124.85 W. 20 km

4. 4 mb (G), 4. 6 HL

California 18 38 20.9 40.34 N., 124.84 W.

3.7 mb, 4.0 ML(B) Rio Dell.

20 57 53.5 39.78 N., 104.87 w. 20 km 2.9 ML Denver (Park Hill), Denver

Thornton (post office).

04 28 32.9 19.30N., 155.19 w. 9 km 3.0 ML Volcano (H) •

13 4 7 14. 1 19.33 N., 155.13 w. 10 km 3.2 ML Table 2.--Summary of macroseismic data for U.S. earthquakes,

8 April (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity IV:

Intensity III: Glenwood (H), Hawaiian

Intensity II:

13 April (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity IV:

3 May (H) Island of Origin time: Epicenter: Depth: Magnitude: Intensity IV:

23 May (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity IV: Intensity III: Glenwood (H), Hawaii Vol-

3 June (H) Island Origin time: Epicenter: Depth: Magnitude: Intensity IV: Intensity III: Glenwood (H), Hawaii Vol-

4 June (H) Island Origin time: Epicenter: Depth: Hagnitude: Intensity IV: Hawaii--Continued

Pepeekeo (H), Honolii (H).

Volcano Observatory (H), Honokaa (H), Laupahoehoe (H).

Ocean View Estates (H), Waimea (H).

Park (H), Hilo (H).

canoes National Park (H), Mountainview (H), Papaikou (H), Volcano (H).

canoes National Park (H), Honokaa (H), Kalapana (H), Paauilo (H), Volcano (H).

02 43 44.2 19.83 N., 155. 14 w. 29 km 3.6 ML Hilo (H), Papaiko (H),

06 55 12.7 19.34 N., 155.07 w. 8 km 3.4 ML Hawaii Volcanoes National

Hawaii 17 29 06.4 19.29 N., 155.50 W. 8 km 3.1 ML Pahala (H).

07 09 26.7 19.31 N., 155.22 w. 10 km 3.4 ML Hilo (H).

of Hawaii 01 02 02.1 19.67 N., 155.16 W. 14 km

3. 2 ML Hilo (H).

of Hawaii 08 00 44.9 19.81 N., 155.79 W. 16 km 3.0 ML Kona (H).

B21

Table 2.-Summary of macroseismic data for U.S. earthquakes,

12 June (H) Island of Hawaii

13 June (H) Island of Hawaii

13 June (H) Island of Hawaii

21 June (H) Island of Hawaii

23 June (H) Island of Hawaii

30 June (H) Island of Hawaii Hawaii--Continued

Origin time: Epicenter: Depth: Magnitude: Intensity IV: Intensity III: Hawaiian Volcano Observatory (H), Hawaii Volcanoes National Park (H), Volcano (H).

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

Estates (H), Naalehu (H).

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

Intensity III: Mountainview (H), Volcano (H), Wainaku (H).

Origin time: Epicenter: Depth:

Intensity III: Hawaii Volcanoes National Park (H), Pahala (H), Volcano (H).

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

canoes National Park, Hamakua (H), Hilo, Honokaa, Honomu, Keaau, Kukuihaele, Kurtistown, Naalehu, Paauhau, Paauilo, Pahala, Pahoa, Papaikou, Pepeekeo, Puna (H), Volcano. Intensity III: Kau, Kohala, Kona. Intensity II:

Origin time: Epicenter: Depth: Magnitude: Intensity III: Hawaiian Ocean View Estates (H). 21 57 12.1 19.40 N., 155.26 w.

3.0 ML Kilauea Caldera (H).

02 49 35.0 18.90 N., 155.46 W. 15 km 3.4 ML Hawaiian Ocean View

16 54 01.2 19.34 N., 155.05 W. 6 km 3.1 ML Kalapana (H), Kapaahu

10 20 44.1 19.32 N., 155.22 W. 10 km 3.4 ML

11 47 52.6 19.32 N., 155.26 w. 11 km 4.9 mb(G), 4.2 ML Captain Cook, Hawaii Vol-

Kalaupapa.

22 28 02.8 19.17 N., 155.48 w.

3.1 ML Table 2.--Summary of macroseismic data for U.S. earthquakes.,

3 April (G) Western Origin time: Epicenter: Depth: Magnitude: Intensity IV:

20 April (G) Southeastern Idaho Origin time: Epicenter: Depth: Magnitude: Intensity IV: Intensity III:

23 April (G) Western Montana Origin time:

See Montana listing.

2 June (S) Southern Origin time: Epicenter: Depth: Magnitude: Intensity IV:

23 April (G) Western Origin time: Epicenter: Depth: Magnitude:

This earthquake was felt over an area

Intensity V:

Intensity IV: April-June 19 78--Continued

report).

of approximately 94,000 sq km of eastern Idaho and western Montana (fig. 9).

Montana--Ovando (hanging pictures fell), Ravalli (small objects overturned).

Idaho--Calder, North Fork. Montana--Anaconda, Arlee, Augusta, Big Arm, Black Eagle, Bonner, Boulder, Butte, Canyon Creek, Carter, Charlo, Choteau, Clancy, Clinton, Conrad, Corvallis, Deer Lodge, Table 2.--Summary of macroseismic data for U.S. earthquakes,

Idaho 1010 08.1 44.05 N., 116. 36 W. 5 km 3.2HL, 3.6ML(D) Sweet.

14 56 47.6 42.66 N., 111.55 w. 5 km 2.5 ML Conda. Soda Springs (telephone

Illinois 02 07 28.8 38.42 N., 88.46 W. 20 km 3.5 mbLg(V) Fairfield, Flora. 23 April (G) Western Montana

Montana 23 24 37-0 46.97 N., 113.27 W. 5 km 4.5 mb, 4.3 MS, 4.9 ML 7 May (G) Central Nebraska Intensity III:

Intensity II:

Origin time: Epicenter: Depth:

Intensity II:

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

Intensity III: Elsie, 56 km north of Dixon, East Helena, Elliston, Fairfield, Florence, Frenchtown, Garrison, Great Falls, Greenough, Hall, Hamilton, Helena, Helmville, Hot Springs, Jefferson City, Kalispell, Lincoln, Lolo, ~~rysville, Milltown, Missoula, Moiese, Monarch, Montana City, Oilmont, Pablo, Paradise, Pendroy, Philipsburg, Polson, Power, Radersburg, Rollins, Ronan, Saint Ignatius, Saint Regis, Saltese, Seeley Lake, Silver Star, Simms, Sunburst, Sun River, Superior, Swan Lake, Toston, Townsend, Trout Creek, Troy, Ulm, Valier, Victor, Warmsprings, Whitehall, White Sulphur Springs, Winston.

Idaho--Elk River, Headquarters. Montana--Basin, Brady, Cascade, Darby, Dutton, Essex, Fort Shaw, Jackson, Kevin, Orofino, Raynesford, Stockett, Sula, Vaughn, Willow Creek, Wolf Creek.

Idaho--Kellogg. Montana--Fort Benton, Heart Butte, Polaris, Sand Coulee, Wise River, Wisdom.

phone report).

north and 5 km east of Ashby, 27 km north of Ashby, 26 km north of Ashby, 16 km north of Ashby, 10 km south of Ashby, 26 km south of Ashby, 27 km north of Bingham, 60 km west of Hyannis, 13 km southwest of Lewellen, 13 km north of Mullen, Whitman, 37 km north of Whitman.

Hyannis, 40 km north-northeast of Mullen, 5 km west of Oshkosh. April-June 1978--Continued

Nebraska 23 36 43.7 47.00 N., 113.31 w. 5 km 3.7 ML Dixon, Polson (tele-

16 06 19.6 42.30 N., 101.93 w. 15 km 4.3 mbLg, 4.0 mbLg(S) Arthur, Ashby, 27 km FIGURE 9.--Isoseismal map for the western Montana earthquake of 23 April 1978, 23 24 37.0 UTC.

Table 2.--Summary of macroseismic data for U.S. earthquakes,

11 April (E) Southern Nevada Origin time: Epicenter: Depth: Magnitude:

Nevada Test Site explosion "FONDOTTA"

Felt at intensity 5

at 37 17'58.66" N., 116 19'36.12" w., surface elevation 2099 m, depth of burial 633 m.

IDAHO

Roman numerals represent Modified Mercalli intensities between isoseismals; Arabic numerals are used to represent these intensities at specific sites.

Nevada 15 30 00.161 37.30 N., 116.33 w. 0 km 5.3 mb(G), 5.3 ML(B)

Table 2.--Summary of macroseismic data for U.S. earthquakes,

11 April (E) Southern Nevada

B23

Origin time: Epicenter: Depth: Magnitude:

Nevada Test Site explosion "BACKBEACH"

at 37 14'00. 57" N., 116 22'06. 49" w., surface elevation 2066 m, depth of burial 611 m.

livingston

50 km

17 45 00.073 37.23 N., 116.37 w. 0 km 5.5 mb(G), 4.5 MS(G), 5.3ML(B) Table 2.-Summary of macroseismic data for U.S. earthquakes,

20 April (G) Southern Nevada Origin time: Epicenter: Depth: Magnitude: Intensity II:

20 April (G) Southern Nevada Origin time: Epicenter: Depth: Magnitude: Intensity II:

23 May (G) Northern Origin time: Epicenter: Depth: Magnitude: Intensity V: Intensity IV:

30 June (L) Northern Origin time: Epicenter: Depth: Magnitude: Intensity IV:

Intensity III:

30 June (L) Northern New Jersey Origin time: Epicenter: Depth: Magnitude: Intensity III: Oakland, New Jersey-

16 June (G) West Texas Origin time:

See Texas listing.

New Jersey--Mahwah (press report), Oakland (press report). New York--Hillburn (press report), Suffern (press report).

New York--Pine Grove (press report), Sloatsburg (press report), Tuxedo Park (press report).

Suffern, New York area (press report).

13 15 47.3 35.80 N., 114.90 w. 10 km 1.9 ML Boulder City.

13 18 44.5 35.80 N., 114.90 w. 10 km 1.9 ML Boulder City.

Nevada OS 4 7 55.4 40.87 N., 117.26 W. 11 km 4.1 mb, 4.6 ML(B) Battle Mountain, Valmy. Golconda, Winnemucca.

New Jersey 20 13 43.6 41.07 N., 74.20 W. 5 km 2.9 mbLg

22 39 49.7 41.08 N., 74.20 w. 6 km 2.2 ML

11 46 54. 2 Table 2.--Summary of macroseismic data for U.S. earthquakes,

30 June (L) Northern New Jersey Origin time:

See New Jersey listing.

30 June (L) Northern New Jersey Origin time:

See New Jersey listing.

17 May (T) Central Origin time: Epicenter: Depth: Magnitude: Intensity I:

18 May (T) Central Origin time: Epicenter: Depth: Magnitude: Intensity III:

18 May (T) Central Oklahoma Origin time: Epicenter: Depth: Magnitude: Intensity II:

16 June (G) West Texas Origin time: Epicenter: Depth: Magnitude:

This earthquake was felt over an area

Intensity V: April-June 1978--Continued

of approximately 52,000 sq km of west Texas (fig. 10).

Texas--Carlsbad (hanging pictures fell, small objects broke), Fluvanna (one broken window, hanging pictures fell, light furniture shifted), Justiceburg (unconfirmed report of cracked plaster), Peacock (few cracked windows), Rotan (light furniture shifted), Snyder (cracked Oklahoma

Texas 20 13 43.6

23 11 15. 7 35.53 N., 97.91 W. 5 km 2.3 mbLg El Reno (T).

00 19 22.4 35.50 N., 97.50 W. 5 km 2.7 mbLg El Reno (T).

00 32 17.6 35.60 N., 97.83 w. 5 km 2.1 mbLg El Reno (T).

11 46 54.2 33.03 N., 100.77 w. 10 km 4.4 mb, 5.3 ML, 4.6 mbLg(S) Roman FIGURE 10.--Isoseismal map for the west Texas earthquake of 16 June 1978, 11 46 54.2 UTC. Arabic numerals represent Modified Mercalli intensities between isoseismals; numerals are used to represent these intensities at specific sites.

B25

Table 2.--Summary of macroseismic data for U.S. earthquakes, Table 2.-Summary of macroseismic data for U.S. earthquakes,

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