M1.6 earthquake 4 km WSW of Cobb, California

Magnitude

1.6 (md), micro

Local time

Sat, Apr 4, 1987, 6:27 PM PST

UTC

1987-04-05 02:27:15 UTC

Depth

-0.0 km (-0.0 mi), shallow

Epicenter

38.800° N, 122.767° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 0.6 km in depth

Magnitude uncertainty

±0.16

Depth from

From location

Station coverage gap

74°

Stations used

10

• Cobb, CaliforniaPopulation 1,778. Forecast4 kmWSW
• Clearlake, CaliforniaPopulation 15,182. Forecast21 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast40 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast665 kmNW

After

1. 1.811 km NNE of Geyserville, CaliforniaTue, Apr 21, 9:29 AM PDT · 14399 days ago · 3 km deep · 7 km away
2. 1.77 km W of Cobb, CaliforniaTue, Apr 21, 6:26 PM PDT · 14399 days ago · 3 km deep · 4 km away
3. 1.76 km W of Cobb, CaliforniaTue, Apr 21, 9:27 PM PDT · 14399 days ago · 4 km deep · 3 km away
4. 1.84 km W of Moskowite Corner, CaliforniaWed, Apr 22, 7:05 AM PDT · 14398 days ago · 7 km deep · 61 km away
5. 1.76 km WSW of Cobb, CaliforniaWed, Apr 22, 2:34 PM PDT · 14398 days ago · 1 km deep · 3 km away
6. 1.87 km W of Cobb, CaliforniaThu, Apr 23, 2:51 AM PDT · 14398 days ago · 3 km deep · 4 km away
7. 1.74 km SSW of Cobb, CaliforniaThu, Apr 23, 8:35 AM PDT · 14397 days ago · -1 km deep · 2 km away
8. 2.15 km WNW of Cobb, CaliforniaThu, Apr 23, 10:14 PM PDT · 14397 days ago · 0 km deep · 4 km away
9. 1.65 km W of Cobb, CaliforniaFri, Apr 24, 1:11 AM PDT · 14397 days ago · 1 km deep · 3 km away
10. 1.65 km W of Cobb, CaliforniaFri, Apr 24, 4:01 AM PDT · 14396 days ago · -1 km deep · 3 km away
11. 2.47 km WSW of Cobb, CaliforniaFri, Apr 24, 5:00 AM PDT · 14396 days ago · 1 km deep · 3 km away
12. 2.2Northern CaliforniaFri, Apr 24, 5:02 AM PDT · 14396 days ago · 2 km deep · 5 km away
13. 1.56 km W of Cobb, CaliforniaFri, Apr 24, 1:03 PM PDT · 14396 days ago · 1 km deep · 3 km away
14. 1.75 km WNW of Cobb, CaliforniaFri, Apr 24, 2:07 PM PDT · 14396 days ago · 1 km deep · 4 km away
15. 1.85 km WNW of Cobb, CaliforniaSat, Apr 25, 6:51 AM PDT · 14395 days ago · 1 km deep · 4 km away
16. 2.85 km SW of Cobb, CaliforniaSat, Apr 25, 10:26 AM PDT · 14395 days ago · 2 km deep · 2 km away
17. 1.86 km W of Cobb, CaliforniaSat, Apr 25, 1:06 PM PDT · 14395 days ago · 3 km deep · 3 km away
18. 2.10 km SSW of Kelseyville, CaliforniaSun, Apr 26, 12:15 AM PDT · 14395 days ago · 4 km deep · 21 km away
19. 1.70 km SSW of Kelseyville, CaliforniaSun, Apr 26, 12:19 AM PDT · 14395 days ago · 4 km deep · 21 km away
20. 1.60 km N of Kelseyville, CaliforniaSun, Apr 26, 12:34 AM PDT · 14395 days ago · 4 km deep · 21 km away
21. 2.7Northern CaliforniaSun, Apr 26, 2:54 AM PDT · 14395 days ago · 4 km deep · 21 km away
22. 2.0Northern CaliforniaSun, Apr 26, 3:01 AM PDT · 14395 days ago · 4 km deep · 21 km away
23. 1.80 km N of Kelseyville, CaliforniaSun, Apr 26, 3:03 AM PDT · 14395 days ago · 3 km deep · 21 km away
24. 2.80 km WSW of Kelseyville, CaliforniaSun, Apr 26, 3:09 AM PDT · 14395 days ago · 3 km deep · 21 km away
25. 1.70 km WSW of Kelseyville, CaliforniaSun, Apr 26, 3:20 AM PDT · 14394 days ago · 4 km deep · 21 km away
26. 2.8Northern CaliforniaSun, Apr 26, 4:35 AM PDT · 14394 days ago · 4 km deep · 21 km away
27. 1.80 km N of Kelseyville, CaliforniaSun, Apr 26, 7:18 AM PDT · 14394 days ago · 3 km deep · 21 km away
28. 1.70 km NNW of Kelseyville, CaliforniaSun, Apr 26, 7:34 AM PDT · 14394 days ago · 2 km deep · 21 km away
29. 1.77 km WSW of Cobb, CaliforniaSun, Apr 26, 9:34 AM PDT · 14394 days ago · 3 km deep · 4 km away
30. 1.615 km ENE of Potter Valley, CaliforniaSun, Apr 26, 12:03 PM PDT · 14394 days ago · 6 km deep · 64 km away
31. 2.15 km WSW of Cobb, CaliforniaSun, Apr 26, 9:52 PM PDT · 14394 days ago · 4 km deep · 1 km away
32. 2.54 km SW of Cobb, CaliforniaMon, Apr 27, 12:34 AM PDT · 14394 days ago · 0 km deep · 1 km away
33. 1.74 km W of Cobb, CaliforniaMon, Apr 27, 1:05 AM PDT · 14394 days ago · -1 km deep · 2 km away
34. 2.90 km ENE of Kelseyville, CaliforniaMon, Apr 27, 1:06 AM PDT · 14394 days ago · 4 km deep · 21 km away
35. 1.90 km WNW of Kelseyville, CaliforniaMon, Apr 27, 4:15 AM PDT · 14393 days ago · 3 km deep · 21 km away
36. 1.60 km ENE of Kelseyville, CaliforniaMon, Apr 27, 6:02 AM PDT · 14393 days ago · 4 km deep · 21 km away
37. 1.87 km NE of Upper Lake, CaliforniaMon, Apr 27, 8:08 AM PDT · 14393 days ago · 6 km deep · 46 km away
38. 2.16 km W of Cobb, CaliforniaMon, Apr 27, 9:59 AM PDT · 14393 days ago · 3 km deep · 3 km away
39. 1.65 km W of Cobb, CaliforniaMon, Apr 27, 10:02 AM PDT · 14393 days ago · 2 km deep · 3 km away
40. 1.78 km WSW of Cobb, CaliforniaWed, Apr 29, 3:06 PM PDT · 14391 days ago · 0 km deep · 4 km away
41. 1.97 km WSW of Kenwood, CaliforniaWed, Apr 29, 6:32 PM PDT · 14391 days ago · 2 km deep · 47 km away
42. 1.56 km WSW of Cobb, CaliforniaThu, Apr 30, 8:10 AM PDT · 14390 days ago · 3 km deep · 3 km away
43. 1.96 km WSW of Cobb, CaliforniaThu, Apr 30, 8:11 AM PDT · 14390 days ago · 3 km deep · 3 km away
44. 1.76 km WNW of Kenwood, CaliforniaThu, Apr 30, 1:40 PM PDT · 14390 days ago · 5 km deep · 43 km away
45. 1.77 km W of Kenwood, CaliforniaThu, Apr 30, 5:08 PM PDT · 14390 days ago · 6 km deep · 43 km away
46. 1.57 km WSW of Cobb, CaliforniaFri, May 1, 9:40 PM PDT · 14389 days ago · 3 km deep · 3 km away
47. 2.010 km WNW of Bolinas, CaliforniaFri, May 1, 9:55 PM PDT · 14389 days ago · 6 km deep · 94 km away
48. 1.715 km E of Comptche, CaliforniaSat, May 2, 4:36 AM PDT · 14388 days ago · 3 km deep · 76 km away
49. 2.27 km W of Cobb, CaliforniaSat, May 2, 5:16 AM PDT · 14388 days ago · 3 km deep · 4 km away
50. 2.212 km NNE of Angwin, CaliforniaSat, May 2, 4:43 PM PDT · 14388 days ago · 8 km deep · 36 km away
51. 1.76 km W of Cobb, CaliforniaSat, May 2, 7:40 PM PDT · 14388 days ago · 3 km deep · 4 km away
52. 2.38 km SSW of Calistoga, CaliforniaSat, May 2, 8:35 PM PDT · 14388 days ago · 6 km deep · 35 km away
53. 1.77 km W of Cobb, CaliforniaSun, May 3, 3:29 AM PDT · 14387 days ago · 3 km deep · 4 km away
54. 2.05 km W of Cobb, CaliforniaMon, May 4, 4:26 AM PDT · 14386 days ago · 0 km deep · 3 km away
55. 1.66 km W of Cobb, CaliforniaMon, May 4, 3:26 PM PDT · 14386 days ago · 3 km deep · 3 km away
56. 2.54 km WSW of Cobb, CaliforniaMon, May 4, 9:54 PM PDT · 14386 days ago · 1 km deep · 0 km away
57. 1.58 km WSW of Cobb, CaliforniaTue, May 5, 2:02 AM PDT · 14386 days ago · 3 km deep · 4 km away
58. 1.56 km SW of Cobb, CaliforniaTue, May 5, 9:50 PM PDT · 14385 days ago · 0 km deep · 2 km away
59. 2.55 km SW of Cobb, CaliforniaTue, May 5, 9:51 PM PDT · 14385 days ago · -1 km deep · 2 km away
60. 2.66 km W of Cobb, CaliforniaWed, May 6, 7:23 AM PDT · 14384 days ago · 3 km deep · 3 km away

The first 60 of 178.

From the USGS Earthquake Hazards Program and its partner networks, event nc1148847. Read Tue, Sep 22, 2026, 9:39 PM UTC.