M1.8 earthquake 8 km ESE of Tracy, California

Magnitude

1.8 (md), micro

Local time

Tue, Dec 8, 1981, 8:43 AM PST

UTC

1981-12-08 16:43:17 UTC

Depth

78.5 km (48.8 mi), intermediate-depth

Epicenter

37.706° N, 121.336° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 5.0 km horizontally, 6.8 km in depth

Magnitude uncertainty

±0.15

Depth from

From location

Station coverage gap

246°, poorly surrounded by stations

Stations used

5

• Tracy, CaliforniaPopulation 87,075. Forecast9 kmESE
• Stockton, CaliforniaPopulation 305,658. Forecast28 kmS
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast493 kmNNW

After

1. 2.07 km NW of El Nido, CaliforniaTue, Dec 8, 4:37 PM PST · 16359 days ago · 10 km deep · 91 km away
2. 1.71 km SSE of North Gate, CaliforniaWed, Dec 9, 8:14 AM PST · 16358 days ago · 10 km deep · 61 km away
3. 2.3Northern CaliforniaWed, Dec 9, 7:10 PM PST · 16358 days ago · 15 km deep · 82 km away
4. 2.3Northern CaliforniaWed, Dec 9, 7:13 PM PST · 16358 days ago · 16 km deep · 82 km away
5. 1.7Northern CaliforniaThu, Dec 10, 1:03 AM PST · 16358 days ago · 10 km deep · 61 km away
6. 1.69 km E of San Martin, CaliforniaThu, Dec 10, 1:59 AM PST · 16358 days ago · 8 km deep · 70 km away
7. 2.54 km WNW of San Juan Bautista, CaliforniaThu, Dec 10, 10:24 AM PST · 16357 days ago · 6 km deep · 97 km away
8. 1.79 km NE of San Martin, CaliforniaThu, Dec 10, 10:57 PM PST · 16357 days ago · 5 km deep · 64 km away
9. 1.96 km SSE of Gilroy, CaliforniaFri, Dec 11, 5:55 AM PST · 16356 days ago · 4 km deep · 86 km away
10. 1.89 km NNE of San Juan Bautista, CaliforniaFri, Dec 11, 5:56 AM PST · 16356 days ago · 2 km deep · 88 km away
11. 3.72 km WNW of Portola Valley, CaliforniaSat, Dec 12, 7:11 AM PST · 16355 days ago · 8 km deep · 89 km away
12. 2.82 km WNW of Portola Valley, CaliforniaSat, Dec 12, 7:54 AM PST · 16355 days ago · 7 km deep · 89 km away
13. 2.02 km WNW of Portola Valley, CaliforniaSat, Dec 12, 1:22 PM PST · 16355 days ago · 7 km deep · 89 km away
14. 2.29 km E of Gilroy, CaliforniaSat, Dec 12, 8:23 PM PST · 16355 days ago · 6 km deep · 78 km away
15. 2.22 km ENE of Knightsen, CaliforniaTue, Dec 15, 12:58 AM PST · 16353 days ago · 14 km deep · 40 km away
16. 2.08 km ENE of San Martin, CaliforniaTue, Dec 15, 7:09 PM PST · 16352 days ago · 7 km deep · 68 km away
17. 1.68 km ENE of San Martin, CaliforniaTue, Dec 15, 7:57 PM PST · 16352 days ago · 7 km deep · 68 km away
18. 1.88 km ENE of Morgan Hill, CaliforniaWed, Dec 16, 11:11 AM PST · 16351 days ago · 4 km deep · 64 km away
19. 2.516 km E of East Foothills, CaliforniaThu, Dec 17, 8:51 AM PST · 16350 days ago · 6 km deep · 45 km away
20. 1.72 km WNW of Portola Valley, CaliforniaSat, Dec 19, 1:24 PM PST · 16348 days ago · 7 km deep · 89 km away
21. 1.77 km NE of Aromas, CaliforniaMon, Dec 21, 12:54 AM PST · 16347 days ago · 6 km deep · 89 km away
22. 1.68 km ESE of East Foothills, CaliforniaMon, Dec 21, 8:55 AM PST · 16346 days ago · 6 km deep · 51 km away
23. 1.8Central CaliforniaMon, Dec 21, 5:28 PM PST · 16346 days ago · 3 km deep · 84 km away
24. 1.64 km ESE of Aromas, CaliforniaTue, Dec 22, 7:07 AM PST · 16345 days ago · 7 km deep · 96 km away
25. 1.72 km ESE of Aromas, CaliforniaTue, Dec 22, 6:00 PM PST · 16345 days ago · 8 km deep · 96 km away
26. 2.09 km NNE of Interlaken, CaliforniaWed, Dec 23, 6:02 PM PST · 16344 days ago · 7 km deep · 82 km away
27. 2.82 km ENE of Pacifica, CaliforniaFri, Dec 25, 9:56 AM PST · 16342 days ago · 12 km deep · 100 km away
28. 1.85 km SW of Gilroy, CaliforniaSat, Dec 26, 5:54 AM PST · 16341 days ago · 3 km deep · 85 km away
29. 1.68 km NNE of Interlaken, CaliforniaSat, Dec 26, 10:00 PM PST · 16341 days ago · 10 km deep · 83 km away
30. 1.612 km ENE of Hollister, CaliforniaSat, Dec 26, 10:39 PM PST · 16341 days ago · 4 km deep · 89 km away
31. 2.19 km NW of Hollister, CaliforniaSun, Dec 27, 9:44 AM PST · 16340 days ago · 7 km deep · 88 km away
32. 2.17 km NNW of Pittsburg, CaliforniaFri, Jan 1, 6:29 AM PST · 16335 days ago · 19 km deep · 66 km away
33. 2.38 km ENE of Patterson, CaliforniaSat, Jan 2, 5:56 AM PST · 16334 days ago · 10 km deep · 35 km away
34. 2.012 km SW of Byron, CaliforniaSat, Jan 2, 6:05 PM PST · 16334 days ago · 15 km deep · 38 km away
35. 1.64 km ENE of Lompico, CaliforniaSun, Jan 3, 7:48 PM PST · 16333 days ago · 7 km deep · 88 km away
36. 2.22 km SSW of Hollister, CaliforniaMon, Jan 4, 4:40 PM PST · 16332 days ago · 8 km deep · 97 km away
37. 1.79 km NE of San Martin, CaliforniaWed, Jan 6, 9:50 AM PST · 16330 days ago · 6 km deep · 64 km away
38. 2.217 km E of East Foothills, CaliforniaFri, Jan 8, 2:36 AM PST · 16328 days ago · 6 km deep · 44 km away
39. 2.17 km E of East Foothills, CaliforniaFri, Jan 8, 8:08 PM PST · 16328 days ago · 8 km deep · 51 km away
40. 2.12 km SSE of Concord, CaliforniaSat, Jan 9, 8:20 PM PST · 16327 days ago · 12 km deep · 66 km away
41. 2.516 km ENE of East Foothills, CaliforniaMon, Jan 11, 8:39 AM PST · 16325 days ago · 3 km deep · 42 km away
42. 2.39 km NE of Gilroy, CaliforniaMon, Jan 11, 6:07 PM PST · 16325 days ago · 9 km deep · 73 km away
43. 1.710 km ENE of Blackhawk, CaliforniaMon, Jan 11, 11:32 PM PST · 16325 days ago · 9 km deep · 44 km away
44. 1.910 km ENE of Blackhawk, CaliforniaTue, Jan 12, 11:11 AM PST · 16324 days ago · 4 km deep · 45 km away
45. 1.73 km S of Clayton, CaliforniaThu, Jan 14, 12:05 PM PST · 16322 days ago · 3 km deep · 57 km away
46. 2.12 km SSW of Pittsburg, CaliforniaThu, Jan 14, 4:41 PM PST · 16322 days ago · 16 km deep · 59 km away
47. 1.83 km SW of North Richmond, CaliforniaThu, Jan 14, 5:44 PM PST · 16322 days ago · 5 km deep · 97 km away
48. 1.75 km NNE of Dogtown, CaliforniaSat, Jan 16, 6:47 AM PST · 16320 days ago · 0 km deep · 66 km away
49. 2.08 km NE of Hollister, CaliforniaSun, Jan 17, 2:10 AM PST · 16320 days ago · 2 km deep · 90 km away
50. 2.21 km ESE of Pittsburg, CaliforniaSun, Jan 17, 4:43 AM PST · 16319 days ago · 17 km deep · 59 km away
51. 3.03 km E of Berkeley, CaliforniaMon, Jan 18, 11:13 PM PST · 16318 days ago · 6 km deep · 81 km away
52. 2.210 km NNW of Hollister, CaliforniaWed, Jan 20, 7:43 PM PST · 16316 days ago · 4 km deep · 86 km away
53. 1.71 km SSE of Manteca, CaliforniaThu, Jan 21, 1:02 AM PST · 16316 days ago · 18 km deep · 14 km away
54. 2.03 km E of Berkeley, CaliforniaSun, Jan 24, 8:21 PM PST · 16312 days ago · 10 km deep · 81 km away
55. 2.14 km WSW of Antioch, CaliforniaMon, Jan 25, 5:30 AM PST · 16311 days ago · 15 km deep · 55 km away
56. 2.13 km SSE of Pittsburg, CaliforniaMon, Jan 25, 5:31 AM PST · 16311 days ago · 6 km deep · 57 km away
57. 2.34 km NNE of Benicia, CaliforniaMon, Jan 25, 4:13 PM PST · 16311 days ago · 5 km deep · 82 km away
58. 1.79 km SSW of Lathrop, CaliforniaMon, Jan 25, 11:19 PM PST · 16311 days ago · 6 km deep · 4 km away
59. 1.714 km NE of East Foothills, CaliforniaTue, Jan 26, 9:05 PM PST · 16310 days ago · 5 km deep · 41 km away
60. 1.79 km NE of San Martin, CaliforniaWed, Jan 27, 10:03 AM PST · 16309 days ago · 8 km deep · 65 km away

The first 60 of 78.

Before

1. 1.716 km E of East Foothills, CaliforniaTue, Dec 8, 12:13 AM PST · 16360 days ago · 6 km deep · 45 km away
2. 2.38 km NE of San Martin, CaliforniaSun, Dec 6, 10:31 PM PST · 16361 days ago · 8 km deep · 66 km away
3. 1.72 km NNW of Hollister, CaliforniaFri, Dec 4, 9:04 PM PST · 16363 days ago · 7 km deep · 93 km away
4. 1.93 km WNW of American Canyon, CaliforniaTue, Dec 1, 4:02 PM PST · 16366 days ago · 6 km deep · 100 km away
5. 1.612 km N of Hollister, CaliforniaTue, Dec 1, 5:15 AM PST · 16366 days ago · 6 km deep · 83 km away
6. 1.59 km NE of Morgan Hill, CaliforniaMon, Nov 30, 7:27 PM PST · 16367 days ago · 5 km deep · 61 km away
7. 1.69 km NE of San Martin, CaliforniaMon, Nov 30, 9:10 AM PST · 16367 days ago · 8 km deep · 64 km away
8. 2.09 km E of Gilroy, CaliforniaMon, Nov 30, 6:57 AM PST · 16367 days ago · 9 km deep · 80 km away
9. 2.12 km E of San Juan Bautista, CaliforniaSun, Nov 29, 5:51 PM PST · 16368 days ago · 8 km deep · 97 km away
10. 1.89 km ESE of East Foothills, CaliforniaSat, Nov 28, 10:27 PM PST · 16369 days ago · 7 km deep · 51 km away
11. 2.39 km ESE of East Foothills, CaliforniaSat, Nov 28, 10:11 PM PST · 16369 days ago · 7 km deep · 52 km away
12. 1.77 km E of East Foothills, CaliforniaSat, Nov 28, 4:45 AM PST · 16369 days ago · 9 km deep · 50 km away
13. 1.911 km NNW of Hollister, CaliforniaWed, Nov 25, 8:34 PM PST · 16372 days ago · 7 km deep · 84 km away
14. 1.67 km NE of East Foothills, CaliforniaTue, Nov 24, 11:15 AM PST · 16373 days ago · 10 km deep · 49 km away
15. 1.85 km N of San Leandro, CaliforniaSun, Nov 22, 1:22 AM PST · 16376 days ago · 11 km deep · 73 km away
16. 1.511 km SW of Brentwood, CaliforniaSat, Nov 21, 8:53 PM PST · 16376 days ago · 13 km deep · 42 km away
17. 1.9Northern CaliforniaFri, Nov 20, 6:35 PM PST · 16377 days ago · 16 km deep · 41 km away
18. 1.63 km SW of Loyola, CaliforniaFri, Nov 20, 4:27 AM PST · 16377 days ago · 6 km deep · 82 km away
19. 2.08 km SSE of Gilroy, CaliforniaThu, Nov 19, 10:52 PM PST · 16378 days ago · 6 km deep · 87 km away
20. 2.07 km N of Pittsburg, CaliforniaWed, Nov 18, 7:32 AM PST · 16379 days ago · 18 km deep · 64 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1070124. Read Tue, Sep 22, 2026, 9:42 PM UTC.