M2.1 earthquake 7 km WSW of Cobb, California

Magnitude

2.1 (md), micro

Local time

Sun, Aug 9, 1981, 2:59 PM PDT

UTC

1981-08-09 21:59:40 UTC

Depth

3.9 km (2.4 mi), shallow

Epicenter

38.803° N, 122.800° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.3 km in depth

Magnitude uncertainty

±0.20

Depth from

From location

Station coverage gap

44°

Stations used

28

• Cobb, CaliforniaPopulation 1,778. Forecast7 kmWSW
• Healdsburg, CaliforniaPopulation 11,742. Forecast22 kmNNE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast41 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast667 kmNW

After

1. 1.82 km WNW of Cobb, CaliforniaMon, Aug 10, 4:37 AM PDT · 16486 days ago · 0 km deep · 5 km away
2. 1.78 km WSW of Cobb, CaliforniaTue, Aug 11, 4:22 PM PDT · 16485 days ago · 1 km deep · 2 km away
3. 1.76 km E of Suisun, CaliforniaTue, Aug 11, 8:28 PM PDT · 16485 days ago · 5 km deep · 96 km away
4. 1.77 km E of Fairfield, CaliforniaTue, Aug 11, 9:17 PM PDT · 16485 days ago · 5 km deep · 96 km away
5. 2.110 km N of Moskowite Corner, CaliforniaWed, Aug 12, 2:23 AM PDT · 16484 days ago · 7 km deep · 61 km away
6. 1.57 km W of Cobb, CaliforniaWed, Aug 12, 11:11 AM PDT · 16484 days ago · 1 km deep · 3 km away
7. 2.67 km W of Cobb, CaliforniaWed, Aug 12, 11:11 AM PDT · 16484 days ago · 1 km deep · 3 km away
8. 1.78 km W of Cobb, CaliforniaWed, Aug 12, 11:32 AM PDT · 16484 days ago · 1 km deep · 3 km away
9. 1.69 km WSW of Cobb, CaliforniaWed, Aug 12, 3:10 PM PDT · 16484 days ago · 2 km deep · 2 km away
10. 1.69 km WSW of Cobb, CaliforniaWed, Aug 12, 3:11 PM PDT · 16484 days ago · 2 km deep · 2 km away
11. 1.610 km ESE of Willits, CaliforniaFri, Aug 14, 12:00 AM PDT · 16482 days ago · 6 km deep · 75 km away
12. 1.54 km WNW of Potter Valley, CaliforniaFri, Aug 14, 5:16 AM PDT · 16482 days ago · 9 km deep · 67 km away
13. 2.09 km WSW of Cobb, CaliforniaFri, Aug 14, 5:18 PM PDT · 16482 days ago · 2 km deep · 2 km away
14. 2.53 km NNW of Larkfield-Wikiup, CaliforniaFri, Aug 14, 7:23 PM PDT · 16482 days ago · 2 km deep · 29 km away
15. 1.76 km W of Cobb, CaliforniaSat, Aug 15, 12:21 AM PDT · 16481 days ago · 4 km deep · 2 km away
16. 1.69 km NE of Comptche, CaliforniaSat, Aug 15, 10:29 AM PDT · 16481 days ago · 5 km deep · 85 km away
17. 2.11 km WSW of Geyserville, CaliforniaSun, Aug 16, 4:24 AM PDT · 16480 days ago · 5 km deep · 15 km away
18. 1.74 km S of Cobb, CaliforniaSun, Aug 16, 12:25 PM PDT · 16480 days ago · 1 km deep · 7 km away
19. 1.67 km NNW of Redwood Valley, CaliforniaSun, Aug 16, 12:28 PM PDT · 16480 days ago · 4 km deep · 69 km away
20. 2.17 km W of Cobb, CaliforniaSun, Aug 16, 7:05 PM PDT · 16480 days ago · 4 km deep · 2 km away
21. 1.54 km WNW of Potter Valley, CaliforniaMon, Aug 17, 4:12 AM PDT · 16479 days ago · -1 km deep · 67 km away
22. 1.93 km NNW of Larkfield-Wikiup, CaliforniaMon, Aug 17, 9:01 PM PDT · 16479 days ago · 3 km deep · 29 km away
23. 2.27 km W of Cobb, CaliforniaMon, Aug 17, 11:26 PM PDT · 16478 days ago · 4 km deep · 2 km away
24. 1.74 km S of Cobb, CaliforniaWed, Aug 19, 3:20 AM PDT · 16477 days ago · 1 km deep · 7 km away
25. 1.8near the coast of Northern CaliforniaThu, Aug 20, 1:25 PM PDT · 16476 days ago · 5 km deep · 57 km away
26. 2.49 km WSW of Cobb, CaliforniaFri, Aug 21, 6:52 AM PDT · 16475 days ago · 1 km deep · 2 km away
27. 2.78 km WSW of Cobb, CaliforniaSat, Aug 22, 12:39 AM PDT · 16474 days ago · 2 km deep · 2 km away
28. 1.79 km WSW of Cobb, CaliforniaSat, Aug 22, 12:42 AM PDT · 16474 days ago · 3 km deep · 2 km away
29. 1.59 km WSW of Cobb, CaliforniaSat, Aug 22, 1:02 AM PDT · 16474 days ago · 3 km deep · 2 km away
30. 3.26 km W of Cobb, CaliforniaSat, Aug 22, 5:30 AM PDT · 16474 days ago · 4 km deep · 2 km away
31. 1.810 km W of Cobb, CaliforniaSat, Aug 22, 3:50 PM PDT · 16474 days ago · -1 km deep · 4 km away
32. 1.56 km W of Cobb, CaliforniaSun, Aug 23, 3:41 AM PDT · 16473 days ago · 1 km deep · 1 km away
33. 1.711 km WNW of Cobb, CaliforniaSun, Aug 23, 3:55 AM PDT · 16473 days ago · 1 km deep · 6 km away
34. 1.66 km WSW of Cobb, CaliforniaMon, Aug 24, 4:12 AM PDT · 16472 days ago · 4 km deep · 0 km away
35. 1.66 km WSW of Cobb, CaliforniaMon, Aug 24, 4:13 AM PDT · 16472 days ago · 3 km deep · 1 km away
36. 2.17 km WSW of Cobb, CaliforniaMon, Aug 24, 8:34 PM PDT · 16472 days ago · 0 km deep · 1 km away
37. 1.87 km WSW of Cobb, CaliforniaMon, Aug 24, 9:50 PM PDT · 16472 days ago · 1 km deep · 0 km away
38. 1.99 km WSW of Cobb, CaliforniaTue, Aug 25, 4:48 AM PDT · 16471 days ago · 2 km deep · 2 km away
39. 1.723 km NE of Potter Valley, CaliforniaTue, Aug 25, 9:45 PM PDT · 16471 days ago · 10 km deep · 75 km away
40. 1.87 km W of Cobb, CaliforniaWed, Aug 26, 12:33 PM PDT · 16470 days ago · 2 km deep · 2 km away
41. 1.71 km NW of Larkfield-Wikiup, CaliforniaWed, Aug 26, 1:37 PM PDT · 16470 days ago · 1 km deep · 32 km away
42. 1.89 km NW of Cobb, CaliforniaWed, Aug 26, 7:01 PM PDT · 16470 days ago · 2 km deep · 8 km away
43. 1.719 km ENE of Potter Valley, CaliforniaSun, Aug 30, 8:18 AM PDT · 16466 days ago · 11 km deep · 67 km away
44. 1.57 km SW of Clear Lake Riviera, CaliforniaMon, Aug 31, 4:35 PM PDT · 16465 days ago · 2 km deep · 11 km away
45. 1.85 km NNW of Redwood Valley, CaliforniaMon, Aug 31, 7:36 PM PDT · 16465 days ago · 8 km deep · 67 km away
46. 1.67 km NE of Hopland, CaliforniaMon, Aug 31, 11:42 PM PDT · 16464 days ago · 2 km deep · 33 km away
47. 2.37 km WSW of Cobb, CaliforniaTue, Sep 1, 10:32 AM PDT · 16464 days ago · 2 km deep · 1 km away
48. 1.825 km NNE of Potter Valley, CaliforniaTue, Sep 1, 2:18 PM PDT · 16464 days ago · 9 km deep · 81 km away
49. 1.726 km NNE of Potter Valley, CaliforniaTue, Sep 1, 2:19 PM PDT · 16464 days ago · 10 km deep · 82 km away
50. 1.711 km NNW of Potter Valley, CaliforniaTue, Sep 1, 8:22 PM PDT · 16464 days ago · 8 km deep · 75 km away
51. 1.79 km WSW of Cobb, CaliforniaThu, Sep 3, 6:15 PM PDT · 16462 days ago · 1 km deep · 2 km away
52. 1.75 km SW of Cobb, CaliforniaThu, Sep 3, 11:40 PM PDT · 16461 days ago · 1 km deep · 3 km away
53. 1.67 km ESE of Willits, CaliforniaFri, Sep 4, 7:10 AM PDT · 16461 days ago · 6 km deep · 77 km away
54. 1.71 km WNW of Redwood Valley, CaliforniaFri, Sep 4, 8:50 AM PDT · 16461 days ago · 6 km deep · 63 km away
55. 1.65 km SSW of Clear Lake Riviera, CaliforniaSun, Sep 6, 7:48 PM PDT · 16459 days ago · 1 km deep · 12 km away
56. 1.96 km WSW of Cobb, CaliforniaMon, Sep 7, 8:46 AM PDT · 16458 days ago · 3 km deep · 0 km away
57. 2.06 km WSW of Cobb, CaliforniaMon, Sep 7, 2:07 PM PDT · 16458 days ago · 1 km deep · 1 km away
58. 1.66 km WSW of Cobb, CaliforniaWed, Sep 9, 5:48 AM PDT · 16456 days ago · 0 km deep · 1 km away
59. 1.67 km WSW of Cobb, CaliforniaWed, Sep 9, 8:19 PM PDT · 16456 days ago · 2 km deep · 0 km away
60. 2.16 km W of Cobb, CaliforniaFri, Sep 11, 6:03 AM PDT · 16454 days ago · 4 km deep · 1 km away

The first 60 of 112.

Before

1. 1.66 km ESE of Talmage, CaliforniaSun, Aug 9, 2:31 PM PDT · 16487 days ago · 8 km deep · 43 km away
2. 2.04 km WSW of Cobb, CaliforniaSun, Aug 9, 9:04 AM PDT · 16487 days ago · 4 km deep · 3 km away
3. 1.76 km W of Cobb, CaliforniaSun, Aug 9, 3:25 AM PDT · 16487 days ago · 3 km deep · 1 km away
4. 1.713 km NNE of Angwin, CaliforniaSat, Aug 8, 11:41 PM PDT · 16487 days ago · 9 km deep · 37 km away
5. 1.79 km WSW of Cobb, CaliforniaTue, Aug 4, 11:28 PM PDT · 16491 days ago · 2 km deep · 2 km away
6. 2.07 km WSW of Cobb, CaliforniaTue, Aug 4, 10:35 PM PDT · 16491 days ago · 0 km deep · 1 km away
7. 1.96 km SSW of Green Valley, CaliforniaTue, Aug 4, 8:55 PM PDT · 16492 days ago · 8 km deep · 86 km away
8. 1.99 km NW of Redwood Valley, CaliforniaSun, Aug 2, 8:18 PM PDT · 16494 days ago · 5 km deep · 71 km away
9. 1.66 km W of Cobb, CaliforniaFri, Jul 31, 2:15 PM PDT · 16496 days ago · 3 km deep · 2 km away
10. 1.66 km W of Cobb, CaliforniaFri, Jul 31, 11:19 AM PDT · 16496 days ago · 3 km deep · 2 km away
11. 1.55 km SW of Cobb, CaliforniaFri, Jul 31, 7:33 AM PDT · 16496 days ago · -1 km deep · 3 km away
12. 2.65 km SW of Cobb, CaliforniaFri, Jul 31, 5:56 AM PDT · 16496 days ago · 1 km deep · 3 km away
13. 1.95 km SW of Cobb, CaliforniaFri, Jul 31, 5:52 AM PDT · 16496 days ago · 0 km deep · 3 km away
14. 1.86 km W of Cobb, CaliforniaThu, Jul 30, 10:12 AM PDT · 16497 days ago · 0 km deep · 3 km away
15. 2.522 km NE of Potter Valley, CaliforniaThu, Jul 30, 4:51 AM PDT · 16497 days ago · 12 km deep · 75 km away
16. 1.59 km WSW of Cobb, CaliforniaThu, Jul 30, 3:38 AM PDT · 16497 days ago · 2 km deep · 2 km away
17. 1.54 km SSE of Potter Valley, CaliforniaWed, Jul 29, 11:50 PM PDT · 16497 days ago · 10 km deep · 60 km away
18. 2.22 km ENE of Windsor, CaliforniaWed, Jul 29, 7:26 AM PDT · 16498 days ago · 1 km deep · 27 km away
19. 1.76 km WSW of Cobb, CaliforniaWed, Jul 29, 3:31 AM PDT · 16498 days ago · 3 km deep · 1 km away
20. 2.322 km WNW of Elk Creek, CaliforniaTue, Jul 28, 10:40 PM PDT · 16498 days ago · 7 km deep · 95 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1066522. Read Tue, Sep 29, 2026, 5:01 PM UTC.