M2.8 earthquake 5 km SW of Cobb, California

Magnitude

2.8 (md), micro

Local time

Sat, Apr 25, 1987, 10:26 AM PDT

UTC

1987-04-25 17:26:23 UTC

Depth

1.5 km (0.9 mi), shallow

Epicenter

38.785° N, 122.772° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.1 km horizontally, 0.4 km in depth

Magnitude uncertainty

±0.14

Depth from

From location

Station coverage gap

37°

Stations used

36

• Cobb, CaliforniaPopulation 1,778. Forecast6 kmSW
• Healdsburg, CaliforniaPopulation 11,742. Forecast21 kmNNE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast39 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast664 kmNW

After

1. 2.54 km SW of Glen Ellen, CaliforniaTue, May 12, 9:41 PM PDT · 14378 days ago · 6 km deep · 53 km away
2. 1.78 km WNW of Cobb, CaliforniaTue, May 12, 11:31 PM PDT · 14378 days ago · 3 km deep · 8 km away
3. 1.88 km W of Cobb, CaliforniaWed, May 13, 3:12 AM PDT · 14378 days ago · 1 km deep · 6 km away
4. 1.714 km ESE of Hidden Valley Lake, CaliforniaWed, May 13, 2:40 PM PDT · 14377 days ago · 1 km deep · 31 km away
5. 2.220 km NE of Potter Valley, CaliforniaWed, May 13, 4:36 PM PDT · 14377 days ago · 7 km deep · 73 km away
6. 2.14 km SW of Glen Ellen, CaliforniaWed, May 13, 5:09 PM PDT · 14377 days ago · 6 km deep · 53 km away
7. 2.14 km SW of Glen Ellen, CaliforniaWed, May 13, 10:48 PM PDT · 14377 days ago · 6 km deep · 53 km away
8. 2.25 km W of Cobb, CaliforniaThu, May 14, 4:09 AM PDT · 14377 days ago · 1 km deep · 5 km away
9. 1.66 km W of Cobb, CaliforniaThu, May 14, 5:59 AM PDT · 14377 days ago · 3 km deep · 5 km away
10. 2.02 km SE of Larkfield-Wikiup, CaliforniaThu, May 14, 7:19 PM PDT · 14376 days ago · 4 km deep · 32 km away
11. 1.84 km WSW of Cobb, CaliforniaFri, May 15, 2:09 AM PDT · 14376 days ago · 1 km deep · 2 km away
12. 2.05 km WNW of Cobb, CaliforniaFri, May 15, 3:36 AM PDT · 14376 days ago · 3 km deep · 6 km away
13. 1.56 km WSW of Cobb, CaliforniaFri, May 15, 9:37 AM PDT · 14375 days ago · 3 km deep · 3 km away
14. 1.67 km WSW of Cobb, CaliforniaFri, May 15, 3:03 PM PDT · 14375 days ago · 4 km deep · 3 km away
15. 1.62 km SSW of Sutter, CaliforniaFri, May 15, 11:45 PM PDT · 14375 days ago · 5 km deep · 96 km away
16. 1.75 km SW of Cobb, CaliforniaSat, May 16, 12:11 PM PDT · 14374 days ago · 2 km deep · 0 km away
17. 2.65 km WSW of Cobb, CaliforniaSat, May 16, 6:29 PM PDT · 14374 days ago · 1 km deep · 3 km away
18. 1.57 km W of Cobb, CaliforniaSat, May 16, 8:54 PM PDT · 14374 days ago · 0 km deep · 4 km away
19. 1.88 km WSW of Cobb, CaliforniaSat, May 16, 11:44 PM PDT · 14374 days ago · 3 km deep · 3 km away
20. 1.84 km W of Cobb, CaliforniaSat, May 16, 11:58 PM PDT · 14374 days ago · -1 km deep · 3 km away
21. 1.66 km W of Cobb, CaliforniaSun, May 17, 6:25 AM PDT · 14374 days ago · 3 km deep · 4 km away
22. 2.35 km W of Cobb, CaliforniaSun, May 17, 1:18 PM PDT · 14373 days ago · 0 km deep · 4 km away
23. 2.07 km W of Cobb, CaliforniaSun, May 17, 7:09 PM PDT · 14373 days ago · 1 km deep · 6 km away
24. 1.77 km W of Cobb, CaliforniaSun, May 17, 9:58 PM PDT · 14373 days ago · 3 km deep · 4 km away
25. 1.58 km W of Cobb, CaliforniaMon, May 18, 12:03 AM PDT · 14373 days ago · -1 km deep · 5 km away
26. 1.52 km SSE of Calistoga, CaliforniaMon, May 18, 2:23 PM PDT · 14372 days ago · 2 km deep · 31 km away
27. 1.710 km NW of Cobb, CaliforniaMon, May 18, 4:26 PM PDT · 14372 days ago · 0 km deep · 11 km away
28. 2.58 km W of Cobb, CaliforniaMon, May 18, 9:40 PM PDT · 14372 days ago · 1 km deep · 6 km away
29. 1.78 km W of Cobb, CaliforniaTue, May 19, 8:00 AM PDT · 14372 days ago · 4 km deep · 6 km away
30. 2.04 km W of Cobb, CaliforniaTue, May 19, 11:28 AM PDT · 14371 days ago · 0 km deep · 4 km away
31. 2.86 km W of Cobb, CaliforniaTue, May 19, 6:28 PM PDT · 14371 days ago · 3 km deep · 4 km away
32. 1.69 km W of Cobb, CaliforniaWed, May 20, 7:18 AM PDT · 14371 days ago · 0 km deep · 6 km away
33. 1.95 km WSW of Cobb, CaliforniaWed, May 20, 3:10 PM PDT · 14370 days ago · 1 km deep · 2 km away
34. 1.68 km W of Cobb, CaliforniaWed, May 20, 6:40 PM PDT · 14370 days ago · -1 km deep · 6 km away
35. 1.56 km W of Cobb, CaliforniaWed, May 20, 7:30 PM PDT · 14370 days ago · 3 km deep · 5 km away
36. 1.65 km W of Cobb, CaliforniaWed, May 20, 8:26 PM PDT · 14370 days ago · -1 km deep · 4 km away
37. 1.5Northern CaliforniaThu, May 21, 2:45 AM PDT · 14370 days ago · 8 km deep · 26 km away
38. 1.86 km SSE of Cottonwood, CaliforniaThu, May 21, 4:48 AM PDT · 14370 days ago · 0 km deep · 75 km away
39. 1.56 km W of Cobb, CaliforniaThu, May 21, 6:22 PM PDT · 14369 days ago · 4 km deep · 5 km away
40. 1.67 km WSW of Cobb, CaliforniaFri, May 22, 1:17 PM PDT · 14368 days ago · 1 km deep · 3 km away
41. 1.65 km N of Winters, CaliforniaFri, May 22, 6:09 PM PDT · 14368 days ago · 1 km deep · 74 km away
42. 2.11 km NNW of Winters, CaliforniaFri, May 22, 6:09 PM PDT · 14368 days ago · 2 km deep · 74 km away
43. 2.14 km W of Cobb, CaliforniaSat, May 23, 7:46 AM PDT · 14368 days ago · 0 km deep · 4 km away
44. 1.86 km W of Cobb, CaliforniaSat, May 23, 4:36 PM PDT · 14367 days ago · 3 km deep · 5 km away
45. 2.39 km W of Cobb, CaliforniaSun, May 24, 7:43 AM PDT · 14367 days ago · 0 km deep · 6 km away
46. 1.78 km W of Cobb, CaliforniaSun, May 24, 7:44 AM PDT · 14367 days ago · -1 km deep · 6 km away
47. 1.86 km W of Cobb, CaliforniaSun, May 24, 10:41 PM PDT · 14366 days ago · 3 km deep · 4 km away
48. 2.09 km W of Cobb, CaliforniaSun, May 24, 11:45 PM PDT · 14366 days ago · 0 km deep · 7 km away
49. 1.6Northern CaliforniaMon, May 25, 1:23 AM PDT · 14366 days ago · 4 km deep · 12 km away
50. 1.85 km WSW of Cobb, CaliforniaMon, May 25, 6:47 AM PDT · 14366 days ago · 1 km deep · 2 km away
51. 2.19 km SE of Sea Ranch, CaliforniaMon, May 25, 7:01 AM PDT · 14366 days ago · -1 km deep · 55 km away
52. 1.8Northern CaliforniaMon, May 25, 10:11 AM PDT · 14365 days ago · 9 km deep · 4 km away
53. 1.75 km SW of Cobb, CaliforniaMon, May 25, 12:38 PM PDT · 14365 days ago · 5 km deep · 1 km away
54. 1.85 km SW of Cobb, CaliforniaMon, May 25, 1:06 PM PDT · 14365 days ago · 4 km deep · 1 km away
55. 1.56 km WSW of Cobb, CaliforniaMon, May 25, 10:00 PM PDT · 14365 days ago · 3 km deep · 3 km away
56. 2.07 km W of Cobb, CaliforniaTue, May 26, 6:22 AM PDT · 14365 days ago · 1 km deep · 5 km away
57. 2.28 km WSW of Cobb, CaliforniaTue, May 26, 7:31 PM PDT · 14364 days ago · 2 km deep · 4 km away
58. 1.77 km WSW of Cobb, CaliforniaTue, May 26, 7:46 PM PDT · 14364 days ago · 3 km deep · 3 km away
59. 2.07 km W of Cobb, CaliforniaWed, May 27, 1:41 AM PDT · 14364 days ago · 1 km deep · 6 km away
60. 1.65 km W of Cobb, CaliforniaWed, May 27, 5:31 AM PDT · 14364 days ago · 2 km deep · 5 km away

The first 60 of 177.

From the USGS Earthquake Hazards Program and its partner networks, event nc99238. Read Wed, Sep 23, 2026, 3:21 AM UTC.