Earthquakes in the United States, January-March 1976

29 n 30 n 33 n 36 n 39 n 42 n 44 n 46 n

son 53 n 55 n 58 n 6i n 62 n es n

A2

n 31 n 34 n 37 n 40 n

A4

O D Magnitude <5.0 O D Magnitude 5.0-5.9 O D Magnitude ^6.0

A8

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.

XI. Disturbances in ground many and widespread, varying with ground material. Broad

n^ >

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.

XII. Damage total practically all works of 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

A9

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.

< ^ * D^p- *w

'ii

... ... ... ... ...*iv ... ... ii ... ... ... ... ... ... ... ... ... 'ii ... ... ... ... ... in ... ... ... 4!! !!'. '.'.'. ... in ... ... ... ... ...

in ... ... ...

Table I. Summary of U.S. earthquakes for January-March 1976 Continued

... *vi ... ... ... in ...VI II II ...*iv in ... '.!'. ii ... ... ... . . . ... iff

ii 'ii

All

iii in ... ... in ... ... ...

in ... ... ii

...'ii

ii ...'ii in ii ii

A14

7 January (G) Southern Alaska Origin time: Epicenter: Depth: Magnitude: Intensity III; Palmer (press report).

13 January (G) Andreanof Islands, Aleutian Islands Origin time: Epicenter: Depth: Magnitude: Intensity II;

15 January (G) Southern Alaska Origin time: Epicenter: Depth: Magnitude: Intensity II;

15 January (G) Southern Alaska Origin time: Epicenter: Depth: Magnitude: Intensity IV;

17 January (G) Southern Alaska Origin time: Epicenter: Depth: Magnitude: Intensity II;

22 January (G) Southern Alaska Origin time: Epicenter: Depth: Magnitude: Intensity II;

23 January (G) Fox Islands, Aleutian Islands Origin time: Epicenter: Depth: Magnitude: Intensity IV:

17 18 46.7 61.86 N., 150.67 W. 44 km None computed.

23 48 22.6 51.79 N. , 174.70 W. Normal. 3.9 mb Adak.

02 17 20.4 61.74 N., 149.77 W. 30 km None computed. Willow.

13 12 31.2 62.26 N., 1^0.46 W. Normal. 3.3 ML(M) Talkeetna.

09 09 51.4 61.44 N., 148.38 W. 28 km 2.6 ML(M) Palmer (M).

07 59 20.0 61.57 N., 149.96 W. 59 km None computed. Nancy Lake (M).

13 03 04.7 53.52 N., 166.49 W. 104 km 3.7 mb Unalaska, Dutch Harbor (M),

A15 5 February (G) Kenai Peninsula, Alaska

18 February (G) Andreanof Islands, Aleutian

19 February (G) Andreanof Islands, Aleutian

22 February (G) Andreanof Islands, Aleutian

28 February (G) .Andreanof Islands, Aleutian

8 March (G) Andreanof Islands, Aleutian Islands

13 March (G) Central Alaska Table 2. Summary of macroseismic data for U.S. earthquakes, January-March 1976 Con.

Origin time: 09 36 36.5 Epicenter: 59.99 N., 149.35 W. Depth: 35 km Magnitude: 5.2 mb, 3.9 MS, 4.8 ML(M)

Intensity data from Alaska Tsunami Warning Center. Intensity V; Seward. Intensity IV: Moose Pass area. Intensity III: Anchorage, Whittier. Intensity II: Palmer.

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

Origin time: Epicenter: Depth: Magnitude: Intensity II; Adak (K).

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

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

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

Origin time: Epicenter: Depth: Magnitude: Intensity V: Intensity III; Broad Pass, Sun Trana.

Islands 08 00 58.6 51.57 N., 178.68 W. 39 km 4.9 mb, 4.3 MS Adak (K).

Islands 10 28 33.5 52.49 N., 179.52 W. 212 km 4.9 mb

Islands 07 21 25.8 51.73 N., 176.87 W. 58 km 5.0 mb Adak (K).

Islands 09 43 58.0 51.56 N., 178.54 W. 32 km 4.8 mb Adak (K).

02 28 47.7 51.34 N., 178.03'W. 54 km 4.7 mb, 4.1 MS

14 33 42.5 65.50 N., 148.67 W. 22 km 3.9 mb, 4.2 ML(M) Cantwell, Summit area, 13 March (G) Central Alaska Origin time: Epicenter: Depth: Magnitude: Intensity III: Cantwell.

21 March (G) Kenai Peninsula Origin time: 17 20 27.9 Epicenter: 60.87 N., 149.69 W. Depth: 59 km Magnitude: None computed. Intensity III: Alyeska, Anchorage, Palmer

25 March (G) Kodiak Island region, Aleutian

Origin time:

Epicenter:

Depth:

Magnitude:

Intensity III: Sitkinak Island (Trinity

26 March (G) Central Alaska Origin time: Epicenter: Depth: Magnitude: Intensity IV:

4 February (G) Central Arizona Origin time: 00 04 58.1 Epicenter: 34.66N., 112.50 W. Depth: 12 km Magnitude: 4.9 mb, 5.1 ML, 5.2 ML(P)

A field survey of the epicentral area was

The earthquake was felt from Yuma to Tucson

Most of the housing in the sparsely populated Table 2. Summary of macroseismic data for U.S. earthquakes, January-March 1976 Con.

Alaska Cont inued Arizona Continued

(M).

Island group), Old Harbor area.

conducted by USGS personnel following this earthquake. Listed below are the results of this survey:

and as far north as Flagstaff. It was felt most strongly in the vicinity of Prescott. Sheriff Byron Langdell of Yavapi County reported that telephone service was interrupted for a short time such that calls could be made but none received. Aftershocks were felt at 10 p.m., February 3 and at 2 a.m. and 6 a.m., February 4 (local time), waking many.

area surveyed consisted of mobile-trailer homes, some of which were placed on concrete platforms and called "modular homes." Many were placed on cinderblocks and "skirted" with sheet-metal or some other material. There were almost no brick chimneys in the area. 15 18 57.8 63.51 N., 148.70 W. 45 km 3.3 ML(M)

Islands 07 49 33.6 57.01 N., 153.70 W. 28 km 5.0 mb

14 40 14.2 63.60 N., 147.65 W. Normal. 4.1 mb, 4.2 ML(M) Fairbanks.

A16

Many fallen rocks and boulders were observed south of Prescott on Highway 89, a winding, mountainous road in Prescott National Forest. These were believed to have resulted from an intense rainstorm on February 4-5 and not from the earthquake.

An area around the epicenter having a radius of 360 km was canvassed, and 362 questionnaires were mailed. Figure 7 shows the results of this canvass. The quake was felt over an area of approximately 25,000 sq km. Intensity VI:

Chino Valley At the Buckaroo shopping center and liquor store bottles were thrown from shelves along the north wall. Estimated loss due to breakage was about $100, according to Gladys Armstrong, owner. She said bottles along the shelves on the west wall rattled but did not fall. This one-story building of recent frame construction on flat ground had ceiling beams from east to west. One beam was loosened slightly and the plaster separated from the ceiling. The beams were not structural members of the building, but ornamental. The proprietor of the Shell gas station in this town said he believed cracks in the cinderblock partition in his garage were due to the earthquake. The building was in such poor condition, however, that it would be difficult to say any damage was due to the shock. He related to local TV reporters that he saw waves on the ground and nearly fell over. He also told us he had lived in California for 30 years before coming to Arizona. The Forest Ranger said there was a report of muddied water in a well in the area. This was unconfirmed. Cottonwood Slight damage. Miller Valley In this northern suburb of Prescott, the recently constructed addition to the Safeway supermarket had small cracks in the west wall, beginning at the ceiling and extending downward about 1 m where they disappeared behind shelves. These cracks were located at the juncture of the old and new section of the store. The addition to the building was made in early 1975. The mortar joining the cinderblocks was cracked in a way that might have indicated settling. The assistant manager was sure the cracks were not present before the earthquake. The liquor department just adjacent to the cracked wall is in the new section along the west wall. The bottles rattled and clinked together, the manager stated, but. none were thrown from the shelf.

Arizona Continued Arizona Continued

Paulden This small community is about 12 km north of Chino Valley. The barmaid at the only bar in town said she heard of a mirror falling from the wall at one home. A lamp hanging in the bar swung considerably during the earthquake, she said when asked. The retired deputy-sheriff reported that the most significant thing he noticed was the sound of a large explosion coming from a northeasterly direction. That would be at or near the Dillard's Verde River Ranch, he thought. One resident reported that the waste-line to his son's trailer-home had been broken off by the earthquake. He also stated that it had been loose for some time and that when the shock occurred, the waste-line became disconnected. Intensity V; Clarkdale, Cornville, Dewey, Jerome, Mayer, Peeples Valley (field report), Rio Verde Ranch (southeast of Paulden), Skull Valley. (Interviews in Skull Valley and Peeples Valley, and in small wayside stops, gas stations, and cafes revealed that almost everybody felt the main shock and the aftershocks. Most of those who noticed the swing of hanging objects stated that the direction was from north to south. Many believed damage reports heard on radio and TV were exaggerated. The places mentioned here were all south and west of Prescott.)

23 February (G) Central Arizona

16 January (G) Northern Arkansas

A17

Intensity IV: Ash Fork, Humboldt, Parker Dam, Phoenix, Picacho, Rimrock, Wickenburg, Wide Ruin, Yarnell. Intensity III: Bouse, Wikieup. Intensity II; Chloride, Seligman. Between February 4 and February 9, 12 aftershocks were reported by the Arizona State University Seismograph Station.

Origin time: 14 09 54.4 Epicenter: Depth: Magnitude: Intensity VI: Intensity V;

Valley. Intensity IV; Dewey, Paulden.

Origin time: 19 42 57.0 Epicenter: 35.92 N., 92.12 W. Depth: 14 km Magnitude: 3.2 ML(S) Intensity V; Blanchard Springs Cavern (underground rocks fell). Intensity IV; Bull Shoals, Cotter, Fifty-six, Mountain View, Norfolk. Intensity III; Mountain Home (telephone report). 34.68 N., 112.43 W. 10 km 3.5 ML Chino Valley. Humboldt, Prescott, Skull

Intensity VI; Arkansas Bay, Biggers, Blytheville, Brookland, Bunker, Cash, Datto, Decatur (unconfirmed reports of minor property damage; ceiling tiles fell and some roof

'MISS SSIPPI

A18

damage press report), Delaplaine, Dolph, Egypt, Hardy, Harrisburg, Jonesboro (power blackout, telephone lines down; ceilings, walls floors shook violently at state police headquarters, which is 7.6 m underground press report), Knobel, Lake City, Lepanto, Luxora, Marked Tree, McDougal, Minturn, Okean, Paragould (windows broken; $700 damage estimated press report), Peach Orchard, Portia, Sedgwick, Smithville, Tomato, Trumann, Walnut Ridge (windows blown out in downtown businesses press report), Wynne. Kentucky Fancy Farm. Mississippi Abbeville, Arkabulta, De Soto County (press report), Falkner, Lafayette County (press report), Lee County (press report), Michigan City, Monroe County (press report), Panola County (press report), Quitman County (press report), Tate County (press report), Tunica County (press report), Tupelo (cracked masonry press report).

Alabama Albertville, Bankston, Cherokee, Coker, Florence (furniture moved press report), Lawrence County (some downed powerlines press report), Lexington, Muscle Shoals (press report), Waterloo. Arkansas Alexander, Augusta, Balch, Bassett, Batesville (powerlines down press report), Beech Grove, Bexar, Biscoe, Black Oak, Black Rock, Boswell, Brickeys, Brinkley, Burdette, Caldwell, Camp, Cave City, Chatfield, Cherry Valley, Clarendon, Concord, Cord, Corning, Cotter, Coy, Crawfordsville, Cushman, Dardanelle, Dell, Devalls Bluff, Diaz, Dyess, Earle, Edmondson, Ethel, Etowah, Fisher, Forrest City, Franklin, Gepp, Gillett, Gilmore, Glencoe, Goodwin, Greenway, Gregory, Griffithville, Grubbs, Helena, Hender.son, Heth, Higden, Higginson, Howell, Hoxie, Hughes, Humphrey, Hunter, Imboden, Jacksonport, Jefferson, Joiner, Jordah, Keiser, Kensett, Keo, La Grange, Leachville, Light, Locust Grove, Lynn, Mammoth Spring, Manila, Marcella, Marianna, Marmaduke, Marvell, Maynard, Mcrae, Mellwood, Moro, Moscow, Mountain View, Mount Pleasant, Mountain Home, Newark, Newport, Nimmons, Norfork, Oil Trough, Osceola, Oxford, Palestine, Pineville, Pleasant Grove, Pocahontas, Powhatan, Proctor, Ravenden, Ravenden Springs, Reydell, Reyno, Roe, Rosie, Round Pond, Saffell, Saint Charles, Saint Francis, Shoffner, Smithville, Stonewall, Strawberry, Sweet Home, Swifton, Tilly, Tucker, Tuckerman, Turner, Tyronza, Vanndale, Violet Hill, Wabbaseka, Walcott, Waldenburg, Weiner, Weldon, West Helena, West Memphis, West Ridge, Wheatley, Wideman, Widener, Williford, Wilson. Illinois Cisne, Edwardsville. Kentucky Canton, Clinton, Farmington, Fulton, Grand Rivers, Lovelaceville, Intensity IV; Wingo. Mississippi Alligator, Ashland, Askew, Batesville (powerlines down press report), Belen, Blue Mountain, Blue Springs, Carthage, Cleveland, Coahoma, Coffeeville, Coldwater, Como, Crenshaw, Darling, Derma, Duck Hill, Dumas, Duncan,

Dundee, Ecru, Elliott, Etta, Friars Point, Glendora, Gore Springs, Hernando (powerlines down press report), Hickory Flat, Holly Springs (all residents alarmed press report), Lake Cormorant, Lamar, Le Flore, Marks, Mattson, Mineral Wells, Minter City, Moorhead, Nesbit, Olive Branch, Oxford (press report), Pittsboro, Pleasant Grove, Potts Camp, Red Banks, Rienzi, Robinsonville, Rome, Rosedale, Sarah, Scobey, Sherman, Taylor, Thaxton, Tie Plant, Tiplersville, Toccopola, Tula, Tunica, Victoria, Walls, Waterford, Water Valley, Webb. Missouri Alton, Bakersfield, Blodgett, Bloomfield, Bradleyville, Bragg City, Braggadocio, Briar, Broseley, Brownwood, Canalou, Cardwell, Charleston, Clarkton, Conran, Cooter, Couch, Deering, Dexter, Doniphan, Dudley, Ellington, Fairdealing, Fisk, Fremont, Gibson, Gideon, Gipsy, Gobler, Grayridge, Greenville, Hardenville, Harviell, Hayti, Hendrickson, Hiram, Holcomb, Holland, Hornersville, Kennett, Kewanee, Kinder, Maiden (telephone service disrupted press report), Mill Spring, Montier, Mountain Grove, Mountain View, Myrtle, Neelyville, Oxly, Pascola, Patterson, Peace Valley, Perkins, Piedmont, Pomona, Qulin, Risco, Rives, Senath, Sikeston, Sturdivant, Tallapoosa, Teresita, Thayer, Vanduser, Wardell, Washington, West Plains (press report), Winona, Zalma. Tennessee Alamo, Atwood, Beech Bluff, Bells, Bolivar, Braden, Brighton, Brownsville, Burlison, Cedar Grove, Clifton, College Grove, Collierville, Covington, Crockett Mills, Denmark, Denver, Dukedom, Dyer, Elora, Finley, Fort Pillow, Friendship, Fruitland, Fruitvale, Gadsden, Gallaway, Gattes, Grand Junction, Greenfield, Guys, Halls, Henderson, Hickory Valley, Hickory Withe, Hornbeak, Hornsby, Idlewild, Jackson, La Grange, Laconia, Lavinia, Leach, Lexington, Luray, Llyles, Maury City, Medina, Milledgeville, Millington, Munford, Newbern, North Memphis (press report), Oakfield, Obion, Pinson, Ramer, Ridgely, Ripley, Rives, Rutherford, Samburg, Saulsbury, Selmer, Silerton, Somerville, Trenton, Trimble, Troy, Williston, Yorkville.

Alabama Adger, Brent, Burnwell, Cloverdale, Crestwood, Echola, Ethelsville, Ford City (press report), Gainesville, Hamilton (press report), Killen, New Market, Northport (press report), Northwood, Ragland, Samantha, Sheffield (press report), Tanner, Table 2. Summary of macroseismic data for Table 2. Summary of macroseismic data for U.S. earthquakes, January-March 1976 Con. U.S. earthquakes, January-March 1976 Con.

1 January (P) Southern California Origin time: 17 20 12.9 Epicenter: 33.97N., 117.89 W. Depth: 6 km Magnitude: 4.2 ML, 4.6 mb(G)

This earthquake was felt in Los Angeles, Orange, Riverside, and San Bernardino Counties. It disturbed millions of residents but caused no injuries and did no serious damage (press report). Some telephone service was interrupted (press report). The USGS (C. F. Porcella, written commun., 1977) reported 11 strong-motion accelerograph records were obtained from within a 14 km radius of the epicenter. The maximum recorded acceleration of. 0.28 g occurred in Whittier, about 13.8 km west of the epicenter.

An area around the epicenter having a radius of 60 km was canvassed, and 158 questionnaires were mailed. Figure 9 shows the results of this survey.

10 January (G) Baja California, Mexico Intensity VI: Bell, Cudahy, Maywood. Intensity V: Anaheim, Artesia, Atwood, Brea, Buena Park, Claremont, Compton, Duarte, Fullerton, Huntington Beach, La Habra (earthquake knocked phone service out and rearranged all the pictures on the

117° 14 January (P) Southern California

14 January (B) Central California

A21 Intensity IV: Arcadia, Azusa, Baldwin Park,

Intensity III; Altadena, Chino, Covina,

Intensity II: Bell Gardens, Downey, Lomita,

Origin time: 12 58 15.9 Epicenter: Depth: Magnitude: Intensity III: El Centre (press report).

Origin time: Epicenter: Depth: Magnitude:

Origin time: 21 43 59.3 Epicenter: 36.UN., 120. 16 W. Depth: 5 km Magnitude: 5.1 mb, 4.9 ML(B)

An area around the epicenter having a radius

Intensity VI: Avenal. Intensity V: Mount Hamilton. Intensity IV: Cholame, Coalinga, Creston,

Intensity III: Caruthers, Delano. Intensity II; Laton. Table 2. Summary of macroseismic data for U.S. earthquakes, January-March 1976 Con.

wall press report), La Mirada, Long Beach, Los Angeles, Monrovia, Monterey Park, Orange, Pomona, Rosemead, Seal Beach, Sunset Beach, Upland (press report), Walnut, West Covina, Whittier.

Bassett, Bellflower, Cerritos, Corona, Costa Mesa, Cypress, El Monte, El Segundo, Etiwanda, Fontana, Garden Grove, Glendale, Glendora, Hacienda Heights, Inglewood, La Puente, Laverne, Midway City, Mira Loma, Montclair, Montebello, Mt. Baldy, Newport Beach, Norco (press report), Paramount, Phelan, Placentia, San Dimas, Santa Ana, South Gate, South Pasadena, Stanton, Tustin, Westminster, Wilmington, Yorba Linda.

Huntington Park, Lakewood, Ontario, Silverado, Sunnymead, Temple City.

Montrose, Riverside, San Diego, Sierra Madre.

of 200 km was canvassed, and 290 questionnaires were mailed.

Dos Palos, Five Points, Friant, Huron, Kettleman City, King City, Lemoore, Lost Hills, Piedra, Riverdale, Stratford, Templeton, Westhaven, Yosemite National Park. 115.54 W. 32.05 N. Normal. 4.6 mb

20 26 24.5 33.09 N., 116.65 W. 13 km 3.4 ML 15 January (B) Central California Origin time: 00 09 37.4 Epicenter: 36.15 N. , 120.25 -). Depth: 7 km Magnitude: 3.5 ML(B)

Aftershock of 14 January 21 43 58.5 UTC

Intensity II; San Joaquin Valley (press

L8 January (B) Northern California Origin time: Epicenter: Depth: Magnitude: Intensity IV;

18 January (B) Northern California Origin time: Epicenter: Depth: Magnitude: Intensity III; Lakeport vicinity.

1 February (B) Northern California Origin time: Epicenter: Depth: Magnitude: Intensity II;

19 February (P) Southern California Origin time: Epicenter: Depth: Magnitude: Intensity III; Soledad, Sylmar (P)

24 February (B) Northern California Origin time: Epicenter: Depth: Magnitude: Intensity IV:

1 March (B) Central California Origin time: Epicenter: Depth: Magnitude: Intensity II;

report)

earthquake.

report). San Joaquin Valley (press

01 00 24.7 40.64 N., 124.35 W. 23 km 4.0 mb, 3.7 ML(B) Ferndale.

07 38 25.2 39.06 N., 122.96 W. 7 km 2.6 ML(B)

02 57 39.7 37.93 N., 122.31 W. 4 km 2.6 ML Richmond.

22 09 55.1 34.39 N., 118.35 W. 9 km 3.1 ML

15 13 10.5 40.29 N., 124.37 W. The locations shown below followed by (H) 6 km 3.5 mb(G), 3.5 ML Fo r tuna, Kneeland.

17 06 i( 121.96 W. 3V.73 N. 7 km 2.8 ML Dublin.

A22

6 March (B) Central California

8 March (B) Central California

9 March (B) Central California

17 March (B) Central California

20 January (G) Northern California

designate intensity values assigned by the Hawaiian Volcano Observatory.

1 January (H) Island of Hawaii

Origin time: 13 51 08.1 Epicenter: Depth: Magnitude: Intensity II;

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

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

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

California Off the coast

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

Origin time: 18 54 23.0 Epicenter: 18.85 N., 155.08 W. Depth: 26 km Magnitude: 4.5 ML Intensity III; Kalapana (H). Intensity II; Kona (H), Naalehu (H). 38.83 N., 122.83 W. 4 km 2.9 ML Cobb.

20 23 27.3 37.39 N., 120.10 W. 2 km 2.5 ML(B) Mariposa.

19 45 00.3 37.33 N., 122.18 W. 7 km 2.6 ML Palo Alto.

04 01 52.7 36.82 N., 121.13 W. 8 km 4.2 mb(G), 4.3 ML 15 km northeast of Gilroy,

13 59 37.2 40.38 N., 125.34 W. Normal. 4.8 mb, 4.7 ML(B) Eureka, Ferndale, Petrolia

Hawaii 2 January (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity III; Volcano (H).

7 January (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity III; Pahoa (H).

12 January (H) Island of Hawaii Origin time: 00 05 40.1 Epicenter: 19.51 N., 155.27 W. Depth: 24 km Magnitude: 4.2 ML, 4.5 mb(G), 4.2 MS(G) Intensity IV; Felt islandwide (houses shaken

Intensity III; Kau (H).

Intensity II; Kamuela (H), Kona (H).

12 January (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity III; Nanawale (H).

14 January (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity II;

15 January (H) Island of Hawaii Origin time: 22 41 45.2 Epicenter: 19.41 N., 155.29 W. Depth: 14 km Magnitude: 4.4 ML Intensity V; Intensity IV;

Intensity II;

15 January (H) Island of Hawaii Origin time: 22 59 26.0 Epicenter: 19.41 N., 155.29 W. Depth: 16 km Magnitude: 4.8 mb(G), 4.5 ML Intensity V; Intensity IV;

Intensity III; Felt islandwide (press

Intensity II; Oahu Island (H).

Hawaii Continued Hawaii Cont inued

on the eastern side of the island of Hawaii press report), Hilo (H), Puna (H).

(H).

(H).

report). 01 36 47.2 19.36 N., 155.25 W. 9 km 3.5 ML

11 44 33.2 19.45 N., 154.88 W. 9 km 3.8 ML

13 48 32.9 19.37 N., 155.12 W. 9 km 3.0 ML

22 09 51.9 19.38 N., 155.11 W. 7 km 2.3 ML Volcano (H).

Hilo (H). Other parts of Hawaii Island

Oahu Island (H).

Hilo (H). Other parts of Hawaii Island

A23

17 January (H) Island of Hawaii

18 January (H) Island of Hawaii

18 January (H) Island of Hawaii

19 January (H) Island of Hawaii

19 January (H) Island of Hawaii

21 January (H) Island of Hawaii

23 January (H) Island of Hawaii

27 January (H) Island of Hawaii

Origin time: Epicenter: Depth: Magnitude: Intensity IV; Intensity III; Puna (H), Volcano (H),

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

(H).

Origin time: 14 49 28.3 Epicenter: 19.36N., 155.25 W. Depth: 10 km Magnitude: 3.6 ML Intensity III; Hilo (H), Volcano (H), Intensity II; Puna (H).

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

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

Volcano (H).

Origin time: 21 41 21.2 Epicenter: 19.37 N., 155.12 W. Depth: 9 km Magnitude: 4.1 ML Intensity III; Hilo (H). Intensity II; Honomu (H), Kalapana (H), Papaikou (H), Volcano (H).

Origin time: 12 47 40.0 Epicenter: 19.36 N., 155.09 W. Depth: 9 km Magnitude: 3.7 ML Intensity III; Hilo (H), Puna (H). Intensity II; Kahuku (H), Volcano (H).

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

Kurtistown (H), Volcano (H). 05 29 13.8 19.38 N., 155.11 W. 8 km 3.7 ML Hilo (H).

06 00 03.9 19.35 N., 155.00 W. 4 km 3.2 ML Hilo (H), Kalapana (H). Parts of Puna (H), Volcano

00 13 37.8 19.36 N., 155.13 W. 8 km 3.6 ML Hawaii National Park (H)

09 57 46.4 19.38 N., 155.10 W. 8 km 3.5 ML Hawaii National Park (H),

15 35 51.3 19.35 N., 155.10 W. 9 km 3.6 ML Hilo (H). Glenwood (H), Keaau (H), 27 January (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity II;

28 January (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity IV; Intensity III; Puna areas (H), Volcano (H).

29 January (H) Island of Hawaii Origin time: 20 19 56.4 Epicenter: 19.38N., 155.00 W. Depth: 8 km Magnitude: 4.7 ML, 4.5 mb(G)

Minor household breakage at unknown location

Intensity IV: Hilo (H), Puna areas.

Intensity III; Kau (H), Volcano (H).

Intensity II; Kona (H), northern part of the

1 February (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity III: Hilo (H). Intensity II: Glenwood (H).

4 February (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity III; Intensity II;

4 February (H) Island of Hawaii Origin time: 06 50 58.3 Epicenter: Depth: Magnitude: Intensity III: Intensity II;

8 February (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity III; Volcano (H). Table 2. Summary of macroseismic data for U.S. earthquakes, January-March 1976 Con.

Hawaii Continued Hawaii Continued

(press report).

island.

Kurtistown (H), Mountainview (H). 21 34 04.5 19.34 N., 155.09 W. 7 km 2.9 ML Hawaii National Park (H),

08 26 28.1 19.34 N., 155.11 W. 9 km 4.0 ML Hilo (H).

06 07 26.9 19.37 N., 155.08 W. 8 km 3.3 ML

02 42 13.4 19.38 N., 155.10 W. 8 km 3.4 ML Glenwood (H). Volcano (H).

19.36 N., 155.25 W. 10 km 3.5 ML Hilo (H), Volcano (H). Glenwood (H), Keaau (H),

08 48 12.2 19.33 N., 155.13 W. 8 km 3.2 ML

A24

12 February (H) Island of Hawaii

13 February (H) Island of Hawaii

13 February (H) Island of Hawaii

19 February (H) Island of Hawaii

21 February (G) Island of Hawaii

24 February (H) Island of Hawaii

25 February (H) Island of Hawaii Table 2. Summary of macroseismic data for U.S. earthquakes, January-March 1976 Con.

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

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

(H), Kealakekua (H).

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

Origin time: 04 40 52.5 Epicenter: 19.43N., 155.28 W. Depth: 1 km Magnitude: 2.8 ML Intensity III; Hawaii National Park (H). Intensity II; Hilo (H), Volcano (H).

Origin time: 05 51 13.8 Epicenter: 20.21N., 156.27 W. Depth: Normal. Magnitude: 4.9 mb(G), 4.0 MS(G), 5.1 ML Intensity V; Hana (on Maui Island press report), Honolulu, Hoolehua, Kahului, Kamuela, Kapaau, Kealakekua, Paauhau, Paia. Intensity IV: Captain Cook, Holualoa, Honokaa, Honomu, Kamuela (H), Kohala (H), Kualapuu, Lanai City, Makawao, Maunaloa, Papaikou, Volcano, Wheeler AFB. Intensity III: Kaaawa, southern parts of Hawaii Island (H). Intensity II; Kaneohe, Ookala.

Felt islandwide: Maui (H), Oahu (H).

Origin time: 15 50 19.1 Epicenter: 19.37 N., 155.11 W. Depth: 9 km Magnitude: 4.2 ML Intensity III: Mountainview (H), Volcano (H).

Origin time: 23 48 20.3 Epicenter: 19.37 N., 155.11 W. Depth: 9 km Magnitude: 3.9 ML Intensity III; Hilo (H). Intensity II; Pahoa (H), Volcano (H). 16 18 26.2 19.36 N., 155.06 W. 8 km 3.2 ML Hilo (H).

10 49 51.8 19.52 N., 155.96 W. 10 km 3.6 ML Captain Cook (H), Holualoa

17 12 29.1 19.37 N., 155.84 W. 7 km 2.9 ML Hilo (H).

3 March (H) Island of Hawaii 20 March (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity II;

3 March (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity II;

5 March (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity II;

6 March (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity III; Wahaula Visitors Center (H),

8 March (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity III:

16 March (H) Island of Hawaii 24 March (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity II;

19 March (H) Island of Hawaii Origin time: 13 04 01.3 Epicenter: 19.41 N., 155.26 W. Depth: 4 km Magnitude: 2.7 ML Intensity III; Hawaii National Park (H), Intensity II; Volcano (H).

19 March (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity III; Hilo (H). Intensity II; Volcano (H).

Hawaii Continued Hawaii Continued

Volcano (H).

Volcano (H).

16 52 01.2 19.40 N., 155.26 W. 5 km 2.5 ML Hawaii National Park (H),

23 06 10.3 19.43 N., 155.28 W. 1 km 2.2 ML Hawaii National Park (H),

13 16 52.4 19.61 N., 155.13 W. 11 km 2.6 ML Glenwood (H), Hilo (H)

22 23 04.6 19.36 N., 155.03 W. 7 km 3.5 ML

02 25 34.6 W 19.36 N., 155.12 8 km 3.7 ML Volcano (H).

16 48 16.9 19.37 N., 155.12 W. 8 km 2.8 ML Volcano (H).

23 24 30.3 19.36 N., 155.06 W. 8 km 3.9 ML

A25

21 March (H) Island of Hawaii

22 March (H) Island of Hawaii

23 March (H) Island of Hawaii

23 March (H) Island of Hawaii

24 March (H) Island of Hawaii

29 March (H) Island of Hawaii

Origin time:

Epicenter:

Depth:

Magnitude:

Intensity II;

Origin time:

Epicenter:

Depth:

Magnitude:

Intensity II;

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

Origin time: 06 48 26.9 Epicenter: 19.37N., 155.09 W. Depth: 8 km Magnitude: 3.3 ML Intensity III; Hilo (H).

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

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

Origin time: 01 06 03.1 Epicenter: 19.32N., 155.31 W. Depth: 9 km Magnitude: 3.7 ML Intensity III; Kona (H). Intensity II; Hawaii National Park (H), Hilo (H).

Origin time: 15 09 51.9 Epicenter: 19.37 N., 155.25 W. Depth: 10 km Magnitude: 3.7 ML Intensity III; Hilo (H). Intensity II: Hawaii National Park (H), Keaau (H), Volcano (H).

23 13 19.8 19.33 N., 155.11 W. 9 km 3.1 ML Hilo (H).

23 58 00.2 19.35 N., 155.19 W. 7 km 2.6 ML Volcano (H).

17 27 41.6 19.29 N., 155.36 W. 9 km 2.4 ML Waikeauka (H).

07 19 56.6 19.34 N., 155.11 W. 9 km 3.1 ML Hilo (H).

00 38 11.1 19.33 N., 155.19 W. 8 km 2.8 Volcano (H). 29 March (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity II;

31 March (H) Island of Hawaii Origin time: Epicenter: Depth: Magnitude: Intensity III; Hilo (H).

10 March (G) Northern Idaho Origin time: 02 29 50.7 Epicenter: 47.40 N., 115.80 W. Depth: 0 km Magnitude: 2.7 ML(D)

Rockburst in Star mine.

Intensity III: Star mine, Mullan.

19 January (G) Eastern Kentucky Origin time: 06 20 39.5 Epicenter: 36.88 N. , 83.82 W. Depth: 5 km Magnitude: 4.0 mb, 3.8 ML(S).

This earthquake was felt in southeastern

An area around the epicenter having a radius

Intensity VI;

Hawaii Continued Kentucky Continued

Kentucky, northeastern Tennessee, northwestern North Carolina, southwestern West Virginia, and western Virginia.

of 200 km was canvassed, and 1,528 questionnaires were mailed. Figure 10 shows the results of this canvass and of the re-evaluated questionnaires obtained from G. R. Keller, University of Kentucky, who made an on-site survey.

Kentucky Minor damage reported in Knox and Bell Counties (press report). Artemus (windows broken), Barbourville (objects knocked from shelves in stores, cracked plaster at Union College Univ. of Kentucky commun.), Bimble (fence fell on railroad tracks telephone report), Flat Lick (windows broken Univ. of Kentucky commun.), 18 31 29.8 19.40 N., 155.26 W. 14 km 3.0 ML Volcano (H).

00 52 10.2 19.34 N., 155.12 W. 9 km 3.4 ML

14 March (C) Cape Cod, Massachusetts

Greenroad (sidewalk cracked), Himyar, Hinkle, Jenson, Julip, Kettle Island (plaster cracked), Lexington (at Eastover Mine rocks fell on tracks, material from ceiling fell press report), Pineville (walls cracked), Trosper, Walker (cracks in brick school building), Williamsburg (press report). Intensity V;

Kentucky Bryants Store, Bypro, Callaway, Calvin, Cannon, Corbin, Cubage, Emlyn, Four Mile, Frakes, Gausdale, Girdler, Gray, Hulen, Ingram, Jeffersonville, Lida, London, Marydell, Nevisdale, Pine Knot, Pulaski, Revelo, Salt Gum, Sasser, Scalf, Sile.r, Sizerock, Somerset (press report), Steubenville, Strunk, Tinsley, West Liberty, Woodbine. North Carolina Tuckasegee. Tennessee Andersonville (press report), Duff, Eagan, Jellico, Johnson City (press report), La Follette, Midway, Shawanee, Tri-County \irport (press report), Vonore, Walland. Virginia Ewing, Rose Hill. .West Virginia Naugatuck. Intensity IV;

Kentucky Arjay, Baileys Switch, Beauty, Bush, Buskirk, Dice, Garrard, Hazel Green (press report), Hector, Keavy, Kona, Loyall, Manchester, Mount Sterling, Napfor, Pointer, River, Ruth, Sitka, Tedders, Tuttle, Walden, Wendover, Wittensville. North Carolina Alexander, Montreat. Tennessee Clairfield, Gatlinburg, Jacksboro, Knoxville, Kodak, Maryville, Oneida, Speedwell, Tallassee. Intensity III;

Kentucky Chenoa, Dana, Faubush, Field, Harlan (Univ. of Kentucky commun.), Hyden (Univ. of Kentucky commun.), Middlesboro (press report). North Carolina Almond. Tennessee Lafayette. Intensity II;

Kentucky Ashland (Univ. of Kentucky commun.), Cumberland (press report), Molus (press report), Paint Lick, Summersville. West Virginia Switzer.

Origin time: 23 12 24.6 Epicenter: 41.66 N., 69.97 W. Depth: 0 km Magnitude: 3.0 ML(L) Intensity V; Harwich, North Chatham, West Dennis, West Harwich.

2 February (0) Southwestern Ontario, Canada Origin time: 21 14 02.0 Epicenter: 41.96 N., 82.67 W. Depth: 10 km Magnitude: 3.4 ML

The intensities listed below are based on press reports:

Intensity V;

Michigan Flat Rock (rattled windows and frightened residents).

A27

23 January (S) New Madrid, Missouri

13 March (S) Eastern Missouri

Intensity IV;

Michigan Rockwood, Trenton. Intensity III;

Michigan New Boston, Grosse lie.

Ontario, Canada Colchester, Leamington.

Origin time: 00 56 39.6 Epicenter: Depth: Magnitude: Intensity IV: Marston.

Origin time: 07 25 00.4 Epicenter: 38.12 N., 91.07 W. Depth: 0 km Magnitude: None computed.

Pea Ridge mine explosion 420 tons of explosives.

36.55 N., 89.60 W. 9 km 2.0 ML

21 January (G) Northwestern Montana Origin time: 13 43 29.6 Epicenter: 48.22 N., 114.10 W. Depth: 5 km Magnitude: 3.1 ML Intensity IV: Creston, Hungry Horse, Somers. Intensity III; Flathead Lake region (press

13 February (G) Western Montana Origin time: Epicenter: Depth: Magnitude: Intensity IV:

Intensity II:

3 January (A) Southern Nevada Origin time: Epicenter: Depth: Magnitude:

Nevada Test Site (NTS) explosion at 37°

3 January (G) Southern Nevada Origin time: 22 20 25.0 Epicenter: 37.30 N., 116.33 W. Depth: 0 km Magnitude: 3.6 ML(B)

Collapse from the NTS explosion on 3 January,

4 January (G) Southern Nevada Origin time: 03 23 24.7 Epicenter: 37.30 N., 116.33 W. Depth: 0 km Magnitude: None computed.

Collapse from the NTS explosion on 3 January,

4 January (G) Southern Nevada Origin time: 16 16 09.0 Epicenter: 37.30 N., 116.33 W. Depth: 0 km Magnitude: 4.2 ML(B)

Collapse from the NTS explosion on 3 January, report).

Marysville.

17'47.48" N.,116°19'59.47" W., elevation 2,109 m. Depth of burial 1,451 m.

19 L5 00.2 UTC.

19 15 00.2 UTC.

19 15 00.2 UTC.

06 13 43.1 46.75 N., 112.13 W. 1 km 3.8 ML Clancy, East Helena,

Helena.

19 15 00.2 37.30 N., 116.33 W. 0 km 6.2 mb(G), 5.5 MS(G), 6.2 ML(P), 6.3 ML(B)

A28

4 February (A) Southern Nevada

4 February (A) Southern Nevada

8 February (G) Northwestern Nevada

12 February (A) Southern Nevada

12 February (G) Southern Nevada

14 February (A) Southern Nevada

Origin time: 14 20 00.1 Epicenter: 37.07N., 116.03 W. Depth: 0 km Magnitude: 5.8 mb(G), 5.4 ML(B)

Nevada Test Site explosion at 37°04'09.32"

N., 116°01'48.58" W., elevation 1,245'm.

Depth of burial 640 m.

Origin time: 14 40 00.2 Epicenter: 37.11 N., 116.04 W. Depth: 0 km Magnitude: 5.7 mb(G), 5.6 ML(B)

Nevada Test Site explosion at 37°06'23.74"

N., 116°02'14.73" W., elevation 1,285 m.

Depth of burial 655 m.

Origin time: 06 09 26.5 Epicenter: 39.47N., 119.76 W. Depth: 5 km Magnitude: 3.4 ML(B) Intensity IV; Virginia City. Intensity III; Reno. Intensity II; Steamboat (telephone report).

Origin time: 14 45 00.2 Epicenter: 37.27 N., 116.49 W. Depth: 0 km Magnitude: 6.3 mb(G), 5.5 MS(G), 6.3 ML(B)

Nevada Test Site explosion at 37°16'17.07"

N., 116°29'18.40" W., elevation 1,864 m.

Depth of burial 1,219 m.

Origin time: 17 37 29.0 Epicenter: 37.27 N., 116.49 W. Depth: 0 km Magnitude: 4.8 mb, 4.3 ML(B)

Collapse from the NTS explosion on 12 February, 14 45 00.2 UTC.

Origin time: 11 30 00.2 Epicenter: 37.24 N., 116.42 W. Depth: 0 km Magnitude: 6.0 mb(G), 5.7 ML(B)

Nevada Test Site explosion at 37°14'33.49"

N., 116°25'12.76" W., elevation 1,974 m.

Depth of burial 1,167 m.

Nevada Test Site explosion at 37°18'35.87"

9 March (G) Southern Nevada Origin time: 16 55 02.0 Epicenter: 37.31 N., 116.36 W. Depth: 0 km Magnitude: 4.1 mb, 4.0 ML(B)

Collapse from the NTS explosion on 9 March,

14 March (A) Southern Nevada Origin time: Epicenter: Depth: Magnitude:

Nevada Test Site explosion at 37°18'21.58"

14 March (G) Southern Nevada Origin time: 13 52 42.5 Epicenter: 37.31 N., 116.47 W. Depth: 0 km Magnitude: None computed.

Collapse from the NTS explosion on 14 March,

14 March (G) Southern Nevada Origin time: 14 09 52.0 Epicenter: 37.31 N., 116.47 W. Depth: 0 km Magnitude: 4.3 mb

Collapse from the NTS explosion on 14 March,

14 March (G) Southern Nevada Origin time: 14 18 15.0 Epicenter: 37.31 N., 116.47 W. Depth: 0 km Magnitude: 4.2 mb

Collapse from the NTS explosion on 14 March,

14 March (G) Southern Nevada Origin time: 14 59 22.2 Epicenter: 37.31 N., 116.47 W. Depth: 0 km Magnitude: 4.3 mb

N., 116°21'51.19" W., elevation 2,053 m. Depth of burial 869 m.

14 00 00.1 UTC.

N., 116°28'17.34" W., elevation 1,931 m. Depth of burial 1,273 m.

12 30 00.2 UTC.

12 30 00.2 UTC.

12 30 00.2 UTC. 12 30 00.2 37.31 N., 116.47 W. 0 km 6.3 mb(G), 5.3 MS(G), 6.2 ML(B).

A29 14 March (G) Southern Nevada

17 March (A) southern Nevada

17 March (A) Southern Nevada

11 March (L) Central New Jersey

Collapse from the NTS explosion on 14 March, 12 30 00.2 UTC.

Origin time: 15 24 28.8 Epicenter: 37.31 N., 116.47 W. Depth: 0 km Magnitude: 4.1 mb, 4.7 ML(B)

Collapse from the NTS explosion on 14 March, 12 30 00.2 UTC

Origin time: Epicenter: Depth: Magnitude:

Nevada Test Site explosion at 37°15'21.20"

N., 116°18'42.89" W., elevation 2,108 m.

Depth of burial 879 m.

Origin time: Epicenter: Depth: Magnitude:

Nevada Test Site explosion at 37°06'26.22"

N., 116°03'08.91" W., elevation 1,271 m.

Depth of burial 780 m.

Origin time: 21 07 20.4 Epicenter: 40.96 N., 74.37 W. Depth: 4 km Magnitude: 2.4 mbLg

The densely populated areas of Morris and Passaic Counties, along with a few places in Bergen County in northern New Jersey felt this earthquake. The Lamont-Doherty Geological Observatory (LOGO), Columbia University, Palisades, N. Y. placed an earthquake questionnaire form in several community newspapers in the area. The 56 completed forms received by LOGO and forwarded to USGS were evaluated by the USGS-NEIS as well as by LOGO. There was one report of cracked and fallen plaster, an Intensity VI. There were five returns of Intensity V, reporting that small objects moved, chinaware fell, and pictures were knocked askew; some people were frightened, especially children and animals. Twenty-six Intensity IV reports 14 15 00.1 37.26 N., 116.31 W. 0 km 6.1 mb(G), 4.5 MS(G), 5.8 ML(B)

14 45 00.1 37.11 N., 116.05 W. 0 km 5.8 mb(G), 4.2 MS(G), 5.6 ML(B)

indicated that the earthquake was felt by many; buildings and their contents rattled. 5 January (G) Northwestern New Mexico Twenty-two letters evaluated at Intensity III reported direction and (or) deviation of the event. Two Intensity II returns reported that people felt the earthquake, giving no other information. There were no "not felt" reports forwarded to us. The results of the USGS canvass were as follows: Intensity VI: Pompton Lakes (reports of ceiling cracks from fireplace to center of room, with small pieces of plaster found on rug; pictures dislodged confirmed by LDGO personnel). Intensity V; Butler, Kinnelon (pictures crooked on walls, some chinaware fell), Smoke Rise, West Milford (Shady Lake and High Crest Lake, subdivisions of West Milford). Intensity IV; Blootningdale, Montville, Newfoundland, Totowa Boro. Intensity III; Lake Edenwold, Midvale, Riverdale, Wayne. Intensity II; Ringwood.

A30

Origin time: 06 23 32.9 Epicenter: 35.84 N., 108.34 W. Depth: 25 km Magnitude: 5.0 mb, 4.6 ML

An area around the epicenter having a radius of 300 km was canvassed, and 359 questionnaires were mailed. Figure 11 shows the result of this canvass, combined with information from Dr. Allan R. Sanford, New Mexico Institute of Mining Technology, and the results of a USGS field survey. The earthquake was felt over an area of approximately 115,000 sq km.

Intensity VI;

Arizona Leupp (cracked plaster).

Colorado Cahone (cracked plaster, chimney cracked), Hesperus (new cracks in new concrete platform telephone report). New Mexico Crownpoint (cracked plaster), Cubero, Fort Wingate (cracked plaster), Gallup (minor damage press report),

Intensity V;

Intensity IV;

Intensity III;

Intensity II;

14 January (G) Central New Mexico Origin time: Epicenter: Depth: Magnitude: Intensity II;

16 March (T) Eastern Oklahoma Origin time: 07 39 54.5 Epicenter: 35.30 N., 95.50 W. Depth: None computed. Magnitude: 2.3 ML

The epicenter and intensity data were

U.S. earthquakes, January-March 1976 Con.

New Mexico Continued Oklahoma Continued

Laguna, Mexican Springs (cracked plaster), Regina, Standing Rock (cracked plaster), Thoreau (cracked plaster), Toadlena (cracked plaster), Vanderwagen (cracked plaster).

Arizona Fort Defiance, Indian Wells, Houck, Lukachukai, Lupton, Navajo, St. Johns, Wide Ruins. Colorado Ignazio, Marvel. New Mexico Aztec, Bluewater, Brimhall, Casa Blanca, Church Rock, Cuchillo, Farmington (groceries fell from shelves press report), Fence Lake (bottles fell from shelf), Galina, Gamerco, Grants (press report), Jemez Springs, Kirtland, Lake Valley School, Lumberton, Mentmore, Nageez, Navajo Dam, Ponderosa, Prewitt, Pueblo Pintado School, Quemado, Ramah, Rehoboth, San Mateo, Tohatchi, Waterflow.

Arizona Chambers, Chinle, Petrified Forest National Park, Pinetop, Sanders, Sawmill, Woodruff. Colorado Bayfield, Chimney Rock, Chromo, Cortez, Creede, Dove Creek, Durango, Maher, Mesa Verde, Pagosa Springs, Rico, Towaoc. New Mexico Aneth, Blanco, Bloomfield, Continental Divide, Cuba, Dulce, La Jara, La Puente, Llaves, Los Ojos, Magdalena, New Laguna, Nulan, Rutherton, San Rafael, Seboyeta, Silver City, Thoreau, Zuni.

Colorado Woody Creek, Yellow Jacket. New Mexico Milan. Utah Wellington.

Colorado Pleasant View, Walsenburg. New Mexico Grady.

provided by J. Lawson, Earth Sciences Laboratory, University of Oklahoma, Leonard. 07 01 32.0 34.17 N., 106.81 W. None computed. None computed. 10 km east of Socorro.

Oklahoma 30 March (G) Northwestern Oklahoma

11 March (C) Southeastern Rhode Island

4 February (G) Tennessee-Georgia border

Intensity III; Eufaula, Stidham, Vivian. Intensity II; 8 km northwest of Hannah, Lenna.

Origin time: 09 27 01.0 Epicenter: 36.61 N., 102.08 W. Depth: 5 km Magnitude: 2.7 ML(T) An earlier and smaller shock occurred at 07 05 (T). Intensity V; Boise City, Keyes. Intensity IV; Griggs (press report).

Origin time: 08 29 32.2 Epicenter: Depth: Magnitude: Intensity VI;

Connecticut Rogers (plaster cracked). Intensity V;

Massachusetts Dartmouth, Fairhaven, Fall River (press report), Marshfield Hills, New Bedford, Somerset (press report), Swansea, Westport (knocked snow from roof press report), Westport Point. Rhode Island Bristol, Coventry, Exeter, Hope Valley, Jamestown, Little Compton, Newport (lamp fell from table), North Kingston (press report), North Scituate, Providence (press report), Tiverton, Warren, Warwick. Intensity IV;

Massachusetts Dennisport, Edgartown, Elmwood, Leicester, Osterville, Plymouth, Wakefield. Rhode Island Oakland, Richmond. Intensity III:

Massachusetts Hyannis. Intensity II;

Massachusetts West Falmouth.

Origin time: Epicenter: Depth: Magnitude: Intensity VI:

Tennessee Conasauga (cracked masonry;

everyone frightened). Intensity V:

Georgia Cisco. Intensity IV:

Tennessee Copperhill, Ducktown. Intensity III;

Tennessee Chattanooga (telephone report), 41.56 N., 71.21 W. 0 km 3.5 mbLg

19 53 52.9 35.00 N., 84.75 W. 5 km 3.0 mbLg(V) 19 January (G) Southwestern Texas Origin time: Epicenter: Depth: Magnitude: Intensity IV:

22 January (G) Southwestern Texas Origin time: Epicenter: Depth: Magnitude: Intensity III; Kermit (press report),

25 January (G) Southwestern Texas Origin time: 04 48 27.9 Epicenter: Depth: Magnitude: Intensity V;

Intensity IV;

Intensity III;

11 February (U) Northern Utah Origin time: Epicenter: Depth: Magnitude: Intensity III; Ogden (U).

27 February (G) Northern Utah Origin time: Epicenter: Depth: Magnitude: Intensity II;

5 January (W) Puget Sound, Washington Origin time: 13 25 43.8 Epicenter: 47.46N., 122.60 W. Depth: 42 km Magnitude: 2.7 ML(G) Intensity IV; Hurley, Olympia, Port Orchard. Intensity III; Bremerton (press report),

Intensity II; Steilacoom, Tacoma (press

Texas Kermit.

New Mexico Jal. Texas Notrees.

New Mexico Lea County (press reports), Texas ECtor and Winkler Counties.

View, Roy (all from press reports)

Eatonville, La Grande, Preston.

report).

04 03 30.5 31.90 N., 103.08 W. 1 km 3.3 ML Remit.

07 21 57.0 31.90 N., 103.07 W. 1 km 2.8 ML

31.90 N., 103.08 W. 2 km 4.1 ML

03 28 14.7 41.27 N., 111.84 W. 13 km 2.7 ML(U)

07 18 16.4 41.24 N., 111.27 W. 5 km 2.4 ML(U) Hill AFB, Ogden, Pleasant

A32 27 January (W) Northwestern Washington

31 January (W) Northwestern Washington

27 January (G) Southern Wyoming

furnished data to the National Earthquake Information Service for use in this circular:

ALASKA: Staff of NOAA, Alaska Tsunami Warning

CALIFORNIA: Clarence R. Alien, Seismological

HAWAII: Robert Y. Koyanagi, U.S. Geological

KENTUCKY: G. R. Keller, University of Kentucky,

MISSOURI: Otto Nuttli, Dept. of Geology and

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

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

Stanwood.

Origin time: 10 54 38.7 Epicenter: 41.95N., 107.22 W. Depth: 5 km Magnitude: 2.3 ML Intensity V; Rawlins (knocked lamp off table, pictures off wall press report),

Listed below are the collaborators who 03 09 31.3 47.88 N., 122.17 W. 19 km 2.1 ML(G) Snohomish.

12 27 14.0 48.3-5 N., 122.32 W. 18 km 2.4 ML(G) Camano Islanrt, Silvana.

Center, Palmer. J. B. Townshend, College Observatory, College.

Laboratory, California Institute of Technology, Pasadena. Bruce A. Bolt, Seismograph Station, University of California, Berkeley. Gary S. Fuis, U.S. Geological Survey, Pasadena.

Survey, Hawaiian Volcano Observatory, Hawaii National Park.

Lexington.

Geophysics, St. Louis University, St. Louis. NEW MEXICO: Allan R. Sanford, New Mexico

NEW YORK: Lynn R. Sykes and Yash P. Aggarwal,

OKLAHOMA: James E. Lawson, Jr., University of

UTAH: Department of Geological and

VIRGINIA: G. A. Bollinger, Department of

Acknowledgment is also given to B. B. Poppe for processing the intensity data and drafting the isoseismal maps, and to Paula Smith for doing the computerized manuscript. Institute of Mining and Technology, Socorro.

Lamont-Doherty Geological Observatory, Columbia University, Palisades.

Oklahoma, Earth Sciences Observatory, Leonard.

Geophysical Sciences, University of Utah, Salt Lake City.

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

A33 Bath, Markus, 1966, Earthquake energy and

Fuis, G. S., Friedman, M. E., and Hileman, J. A.,

Gutenberg, B. and Richter, C. F., 1956, Magnitude

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

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

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

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

1977, Preliminary catalog of earthquakes in southern California, July 1974-September 1976: U.S. Geol. Survey Open-File Report 77-181, 107 p.

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

magnitude relations for eastern North America: Jour. Geophys. Research, v. 78, no. 5, p. 876-885.

Francisco, Calif., W. H. Freeman and Co., Inc., 768 p.

Mercalli Intensity Scale of 1931; Seismol. Soc. America Bull., v. 21, no. 4, p. 277-283.

Where this page came from

This page was imported from U.S. Geological Survey. Published by the U.S. Geological Survey and, as a work of the United States government, in the public domain.

Nobody has written it yet — it is the source material at a new address, which is why search engines are asked to skip it and why no one earns from it. It is up for grabs: take it on, and it is yours to rewrite and to earn from.