M1.8 earthquake 6 km SW of Cobb, California

Magnitude

1.8 (md), micro

Local time

Wed, Apr 15, 1987, 6:51 PM PDT

UTC

1987-04-16 01:51:43 UTC

Depth

2.3 km (1.4 mi), shallow

Epicenter

38.791° N, 122.779° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.4 km in depth

Magnitude uncertainty

±0.17

Depth from

From location

Station coverage gap

76°

Stations used

20

• 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. Forecast665 kmNW

After

1. 1.77 km W of Kenwood, CaliforniaThu, Apr 30, 5:08 PM PDT · 14390 days ago · 6 km deep · 43 km away
2. 1.57 km WSW of Cobb, CaliforniaFri, May 1, 9:40 PM PDT · 14389 days ago · 3 km deep · 2 km away
3. 2.010 km WNW of Bolinas, CaliforniaFri, May 1, 9:55 PM PDT · 14389 days ago · 6 km deep · 92 km away
4. 1.715 km E of Comptche, CaliforniaSat, May 2, 4:36 AM PDT · 14388 days ago · 3 km deep · 76 km away
5. 2.27 km W of Cobb, CaliforniaSat, May 2, 5:16 AM PDT · 14388 days ago · 3 km deep · 4 km away
6. 2.212 km NNE of Angwin, CaliforniaSat, May 2, 4:43 PM PDT · 14388 days ago · 8 km deep · 37 km away
7. 1.76 km W of Cobb, CaliforniaSat, May 2, 7:40 PM PDT · 14388 days ago · 3 km deep · 4 km away
8. 2.38 km SSW of Calistoga, CaliforniaSat, May 2, 8:35 PM PDT · 14388 days ago · 6 km deep · 35 km away
9. 1.77 km W of Cobb, CaliforniaSun, May 3, 3:29 AM PDT · 14387 days ago · 3 km deep · 4 km away
10. 2.05 km W of Cobb, CaliforniaMon, May 4, 4:26 AM PDT · 14386 days ago · 0 km deep · 4 km away
11. 1.66 km W of Cobb, CaliforniaMon, May 4, 3:26 PM PDT · 14386 days ago · 3 km deep · 3 km away
12. 2.54 km WSW of Cobb, CaliforniaMon, May 4, 9:54 PM PDT · 14386 days ago · 1 km deep · 2 km away
13. 1.58 km WSW of Cobb, CaliforniaTue, May 5, 2:02 AM PDT · 14386 days ago · 3 km deep · 4 km away
14. 1.56 km SW of Cobb, CaliforniaTue, May 5, 9:50 PM PDT · 14385 days ago · 0 km deep · 1 km away
15. 2.55 km SW of Cobb, CaliforniaTue, May 5, 9:51 PM PDT · 14385 days ago · -1 km deep · 1 km away
16. 2.66 km W of Cobb, CaliforniaWed, May 6, 7:23 AM PDT · 14384 days ago · 3 km deep · 4 km away
17. 1.55 km W of Cobb, CaliforniaWed, May 6, 10:49 AM PDT · 14384 days ago · 0 km deep · 3 km away
18. 1.75 km WSW of Hopland, CaliforniaWed, May 6, 3:12 PM PDT · 14384 days ago · 5 km deep · 38 km away
19. 1.97 km WSW of Cobb, CaliforniaThu, May 7, 2:57 AM PDT · 14384 days ago · -1 km deep · 2 km away
20. 3.55 km W of Cobb, CaliforniaThu, May 7, 10:25 AM PDT · 14383 days ago · 4 km deep · 3 km away
21. 2.012 km N of Comptche, CaliforniaThu, May 7, 1:36 PM PDT · 14383 days ago · 2 km deep · 96 km away
22. 3.04 km WNW of Cobb, CaliforniaFri, May 8, 7:28 AM PDT · 14382 days ago · 2 km deep · 5 km away
23. 1.77 km WSW of Calistoga, CaliforniaFri, May 8, 10:39 AM PDT · 14382 days ago · 0 km deep · 29 km away
24. 1.74 km WSW of Cobb, CaliforniaFri, May 8, 1:13 PM PDT · 14382 days ago · 0 km deep · 3 km away
25. 2.29 km WSW of Cobb, CaliforniaFri, May 8, 2:36 PM PDT · 14382 days ago · 1 km deep · 4 km away
26. 2.04 km WNW of Potter Valley, CaliforniaFri, May 8, 4:09 PM PDT · 14382 days ago · 0 km deep · 69 km away
27. 1.65 km SSW of Cobb, CaliforniaFri, May 8, 9:50 PM PDT · 14382 days ago · 0 km deep · 2 km away
28. 1.619 km N of Upper Lake, CaliforniaSat, May 9, 2:47 PM PDT · 14381 days ago · 4 km deep · 61 km away
29. 1.56 km W of Cobb, CaliforniaSat, May 9, 3:48 PM PDT · 14381 days ago · 0 km deep · 4 km away
30. 1.85 km W of Cobb, CaliforniaSat, May 9, 5:46 PM PDT · 14381 days ago · 1 km deep · 4 km away
31. 1.6Northern CaliforniaSat, May 9, 5:47 PM PDT · 14381 days ago · 0 km deep · 5 km away
32. 1.67 km WSW of Cobb, CaliforniaSun, May 10, 2:59 PM PDT · 14380 days ago · 3 km deep · 2 km away
33. 1.918 km NE of Upper Lake, CaliforniaSun, May 10, 4:04 PM PDT · 14380 days ago · 8 km deep · 55 km away
34. 1.74 km SW of Cobb, CaliforniaSun, May 10, 8:07 PM PDT · 14380 days ago · -1 km deep · 1 km away
35. 2.08 km W of Cobb, CaliforniaMon, May 11, 8:44 PM PDT · 14379 days ago · 1 km deep · 5 km away
36. 2.54 km SW of Glen Ellen, CaliforniaTue, May 12, 9:41 PM PDT · 14378 days ago · 6 km deep · 54 km away
37. 1.78 km WNW of Cobb, CaliforniaTue, May 12, 11:31 PM PDT · 14378 days ago · 3 km deep · 7 km away
38. 1.88 km W of Cobb, CaliforniaWed, May 13, 3:12 AM PDT · 14377 days ago · 1 km deep · 5 km away
39. 1.714 km ESE of Hidden Valley Lake, CaliforniaWed, May 13, 2:40 PM PDT · 14377 days ago · 1 km deep · 32 km away
40. 2.220 km NE of Potter Valley, CaliforniaWed, May 13, 4:36 PM PDT · 14377 days ago · 7 km deep · 73 km away
41. 2.14 km SW of Glen Ellen, CaliforniaWed, May 13, 5:09 PM PDT · 14377 days ago · 6 km deep · 54 km away
42. 2.14 km SW of Glen Ellen, CaliforniaWed, May 13, 10:48 PM PDT · 14377 days ago · 6 km deep · 54 km away
43. 2.25 km W of Cobb, CaliforniaThu, May 14, 4:09 AM PDT · 14376 days ago · 1 km deep · 4 km away
44. 1.66 km W of Cobb, CaliforniaThu, May 14, 5:59 AM PDT · 14376 days ago · 3 km deep · 4 km away
45. 2.02 km SE of Larkfield-Wikiup, CaliforniaThu, May 14, 7:19 PM PDT · 14376 days ago · 4 km deep · 33 km away
46. 1.84 km WSW of Cobb, CaliforniaFri, May 15, 2:09 AM PDT · 14376 days ago · 1 km deep · 1 km away
47. 2.05 km WNW of Cobb, CaliforniaFri, May 15, 3:36 AM PDT · 14375 days ago · 3 km deep · 5 km away
48. 1.56 km WSW of Cobb, CaliforniaFri, May 15, 9:37 AM PDT · 14375 days ago · 3 km deep · 2 km away
49. 1.67 km WSW of Cobb, CaliforniaFri, May 15, 3:03 PM PDT · 14375 days ago · 4 km deep · 2 km away
50. 1.62 km SSW of Sutter, CaliforniaFri, May 15, 11:45 PM PDT · 14375 days ago · 5 km deep · 96 km away
51. 1.75 km SW of Cobb, CaliforniaSat, May 16, 12:11 PM PDT · 14374 days ago · 2 km deep · 1 km away
52. 2.65 km WSW of Cobb, CaliforniaSat, May 16, 6:29 PM PDT · 14374 days ago · 1 km deep · 2 km away
53. 1.57 km W of Cobb, CaliforniaSat, May 16, 8:54 PM PDT · 14374 days ago · 0 km deep · 3 km away
54. 1.88 km WSW of Cobb, CaliforniaSat, May 16, 11:44 PM PDT · 14374 days ago · 3 km deep · 3 km away
55. 1.84 km W of Cobb, CaliforniaSat, May 16, 11:58 PM PDT · 14374 days ago · -1 km deep · 3 km away
56. 1.66 km W of Cobb, CaliforniaSun, May 17, 6:25 AM PDT · 14373 days ago · 3 km deep · 3 km away
57. 2.35 km W of Cobb, CaliforniaSun, May 17, 1:18 PM PDT · 14373 days ago · 0 km deep · 3 km away
58. 2.07 km W of Cobb, CaliforniaSun, May 17, 7:09 PM PDT · 14373 days ago · 1 km deep · 5 km away
59. 1.77 km W of Cobb, CaliforniaSun, May 17, 9:58 PM PDT · 14373 days ago · 3 km deep · 3 km away
60. 1.58 km W of Cobb, CaliforniaMon, May 18, 12:03 AM PDT · 14373 days ago · -1 km deep · 5 km away

The first 60 of 178.

From the USGS Earthquake Hazards Program and its partner networks, event nc98715. Read Tue, Sep 22, 2026, 9:35 PM UTC.