M1.9 earthquake 7 km WSW of Cobb, California

Magnitude

1.9 (md), micro

Local time

Wed, May 20, 1981, 9:45 PM PDT

UTC

1981-05-21 04:45:59 UTC

Depth

2.3 km (1.4 mi), shallow

Epicenter

38.801° N, 122.808° 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

±0.05

Depth from

From location

Station coverage gap

39°

Stations used

24

• Cobb, CaliforniaPopulation 1,778. Forecast8 kmWSW
• Healdsburg, CaliforniaPopulation 11,742. Forecast22 kmNNE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast41 kmNNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast667 kmNW

After

1. 1.86 km W of Cobb, CaliforniaWed, May 20, 11:36 PM PDT · 16568 days ago · 2 km deep · 1 km away
2. 1.76 km WSW of Cobb, CaliforniaWed, May 20, 11:37 PM PDT · 16568 days ago · 1 km deep · 1 km away
3. 1.74 km WSW of Cobb, CaliforniaThu, May 21, 5:15 AM PDT · 16568 days ago · 4 km deep · 3 km away
4. 2.27 km W of Cobb, CaliforniaThu, May 21, 8:31 AM PDT · 16567 days ago · 3 km deep · 1 km away
5. 1.76 km W of Cobb, CaliforniaFri, May 22, 6:00 PM PDT · 16566 days ago · 1 km deep · 2 km away
6. 2.021 km ENE of Potter Valley, CaliforniaSat, May 23, 11:24 AM PDT · 16565 days ago · 6 km deep · 64 km away
7. 2.22 km NNE of Upper Lake, CaliforniaSun, May 24, 2:18 AM PDT · 16565 days ago · 0 km deep · 43 km away
8. 1.82 km SE of Clear Lake Riviera, CaliforniaSun, May 24, 5:29 AM PDT · 16565 days ago · 4 km deep · 18 km away
9. 1.55 km WSW of Cobb, CaliforniaSun, May 24, 6:29 PM PDT · 16564 days ago · 2 km deep · 2 km away
10. 2.511 km N of Cloverdale, CaliforniaSun, May 24, 6:35 PM PDT · 16564 days ago · 3 km deep · 20 km away
11. 1.710 km NNE of Cloverdale, CaliforniaSun, May 24, 6:40 PM PDT · 16564 days ago · 3 km deep · 19 km away
12. 1.78 km WSW of Cobb, CaliforniaWed, May 27, 3:51 AM PDT · 16562 days ago · 1 km deep · 1 km away
13. 1.86 km WSW of Cobb, CaliforniaWed, May 27, 6:49 PM PDT · 16561 days ago · 3 km deep · 1 km away
14. 1.69 km E of Hidden Valley Lake, CaliforniaThu, May 28, 4:00 AM PDT · 16561 days ago · 7 km deep · 31 km away
15. 1.95 km WSW of Cobb, CaliforniaThu, May 28, 5:04 AM PDT · 16561 days ago · -1 km deep · 2 km away
16. 2.122 km NE of Potter Valley, CaliforniaThu, May 28, 8:13 AM PDT · 16560 days ago · 8 km deep · 75 km away
17. 1.94 km SSW of Lagunitas-Forest Knolls, CaliforniaThu, May 28, 5:36 PM PDT · 16560 days ago · 0 km deep · 92 km away
18. 2.06 km W of Cobb, CaliforniaThu, May 28, 10:55 PM PDT · 16560 days ago · 2 km deep · 3 km away
19. 2.16 km W of Cobb, CaliforniaFri, May 29, 4:57 AM PDT · 16560 days ago · 0 km deep · 1 km away
20. 1.98 km ENE of Larkfield-Wikiup, CaliforniaFri, May 29, 7:57 AM PDT · 16560 days ago · 6 km deep · 33 km away
21. 2.76 km W of Cobb, CaliforniaSat, May 30, 6:42 AM PDT · 16559 days ago · 1 km deep · 1 km away
22. 2.46 km WSW of Cobb, CaliforniaSat, May 30, 6:43 AM PDT · 16559 days ago · 1 km deep · 2 km away
23. 2.14 km S of Cobb, CaliforniaSat, May 30, 8:45 AM PDT · 16558 days ago · 0 km deep · 8 km away
24. 1.67 km WSW of Cobb, CaliforniaSat, May 30, 8:55 AM PDT · 16558 days ago · 1 km deep · 0 km away
25. 1.69 km WSW of Cobb, CaliforniaSat, May 30, 1:37 PM PDT · 16558 days ago · -1 km deep · 2 km away
26. 1.79 km ENE of Hidden Valley Lake, CaliforniaSun, May 31, 12:48 PM PDT · 16557 days ago · 7 km deep · 31 km away
27. 1.83 km ESE of Clear Lake Riviera, CaliforniaSun, May 31, 4:49 PM PDT · 16557 days ago · -1 km deep · 19 km away
28. 1.58 km NW of Redwood Valley, CaliforniaSun, May 31, 6:39 PM PDT · 16557 days ago · 5 km deep · 70 km away
29. 1.66 km W of Cobb, CaliforniaSun, May 31, 8:22 PM PDT · 16557 days ago · 2 km deep · 2 km away
30. 2.015 km NNW of Guinda, CaliforniaTue, Jun 2, 7:10 AM PDT · 16556 days ago · 9 km deep · 52 km away
31. 3.59 km ESE of Willits, CaliforniaThu, Jun 4, 5:23 AM PDT · 16554 days ago · 9 km deep · 76 km away
32. 1.69 km ESE of Willits, CaliforniaThu, Jun 4, 8:06 AM PDT · 16553 days ago · 8 km deep · 76 km away
33. 1.79 km E of Hidden Valley Lake, CaliforniaFri, Jun 5, 2:14 AM PDT · 16553 days ago · 7 km deep · 31 km away
34. 1.78 km WSW of Cobb, CaliforniaFri, Jun 5, 9:23 AM PDT · 16552 days ago · 3 km deep · 1 km away
35. 2.26 km WSW of Calistoga, CaliforniaSat, Jun 6, 6:22 AM PDT · 16552 days ago · 5 km deep · 31 km away
36. 2.114 km NNW of Guinda, CaliforniaSat, Jun 6, 7:04 PM PDT · 16551 days ago · 8 km deep · 51 km away
37. 1.69 km WSW of Cobb, CaliforniaSat, Jun 6, 8:51 PM PDT · 16551 days ago · 2 km deep · 2 km away
38. 2.111 km SSE of Comptche, CaliforniaMon, Jun 8, 9:17 PM PDT · 16549 days ago · 3 km deep · 77 km away
39. 2.56 km WSW of Cobb, CaliforniaTue, Jun 9, 3:38 AM PDT · 16549 days ago · 4 km deep · 1 km away
40. 1.85 km WSW of Cobb, CaliforniaWed, Jun 10, 4:33 AM PDT · 16548 days ago · 1 km deep · 3 km away
41. 2.39 km WSW of Cobb, CaliforniaWed, Jun 10, 10:14 AM PDT · 16547 days ago · 2 km deep · 2 km away
42. 1.612 km N of Brooktrails, CaliforniaThu, Jun 11, 1:18 AM PDT · 16547 days ago · 8 km deep · 96 km away
43. 1.95 km NNE of Brooktrails, CaliforniaThu, Jun 11, 5:52 PM PDT · 16546 days ago · 7 km deep · 90 km away
44. 1.74 km S of Cobb, CaliforniaFri, Jun 12, 2:40 AM PDT · 16546 days ago · 1 km deep · 7 km away
45. 2.15 km SW of Cobb, CaliforniaSun, Jun 14, 9:43 AM PDT · 16543 days ago · 1 km deep · 3 km away
46. 1.724 km WNW of Elk Creek, CaliforniaSun, Jun 14, 3:04 PM PDT · 16543 days ago · 5 km deep · 95 km away
47. 1.6Northern CaliforniaSun, Jun 14, 7:18 PM PDT · 16543 days ago · 1 km deep · 1 km away
48. 1.73 km E of Windsor, CaliforniaMon, Jun 15, 9:48 AM PDT · 16542 days ago · 4 km deep · 29 km away
49. 2.18 km W of Cobb, CaliforniaTue, Jun 16, 1:40 AM PDT · 16542 days ago · 1 km deep · 2 km away
50. 1.86 km W of Cobb, CaliforniaTue, Jun 16, 2:11 AM PDT · 16542 days ago · 3 km deep · 2 km away
51. 1.75 km SW of Cobb, CaliforniaTue, Jun 16, 4:51 AM PDT · 16542 days ago · -1 km deep · 4 km away
52. 1.76 km W of Cobb, CaliforniaWed, Jun 17, 7:28 AM PDT · 16541 days ago · 4 km deep · 2 km away
53. 2.35 km SW of Cobb, CAFri, Jun 19, 2:40 PM PDT · 16538 days ago · -1 km deep · 4 km away
54. 1.76 km W of Lower Lake, CaliforniaFri, Jun 19, 4:07 PM PDT · 16538 days ago · 3 km deep · 15 km away
55. 2.57 km WSW of Cobb, CaliforniaFri, Jun 19, 7:21 PM PDT · 16538 days ago · 1 km deep · 1 km away
56. 1.67 km WSW of Cobb, CaliforniaSat, Jun 20, 1:35 AM PDT · 16538 days ago · 3 km deep · 1 km away
57. 1.66 km W of Cobb, CaliforniaSun, Jun 21, 8:02 AM PDT · 16537 days ago · 4 km deep · 2 km away
58. 1.65 km NNE of Rohnert Park, CaliforniaMon, Jun 22, 2:05 AM PDT · 16536 days ago · 16 km deep · 48 km away
59. 3.518 km WSW of Williams, CaliforniaMon, Jun 22, 6:32 AM PDT · 16536 days ago · 12 km deep · 51 km away
60. 1.66 km W of Cobb, CaliforniaMon, Jun 22, 7:56 AM PDT · 16536 days ago · 0 km deep · 2 km away

The first 60 of 119.

Before

1. 1.512 km E of Angwin, CaliforniaTue, May 19, 7:17 PM PDT · 16569 days ago · 5 km deep · 50 km away
2. 2.216 km SSE of Sea Ranch, CaliforniaTue, May 19, 10:08 AM PDT · 16569 days ago · 1 km deep · 56 km away
3. 1.64 km WSW of Cobb, CaliforniaTue, May 19, 5:26 AM PDT · 16570 days ago · 2 km deep · 3 km away
4. 1.57 km WSW of Cobb, CaliforniaTue, May 19, 4:36 AM PDT · 16570 days ago · 2 km deep · 0 km away
5. 1.83 km E of Clear Lake Riviera, CaliforniaTue, May 19, 1:57 AM PDT · 16570 days ago · 3 km deep · 20 km away
6. 1.53 km E of Clear Lake Riviera, CaliforniaTue, May 19, 1:47 AM PDT · 16570 days ago · -1 km deep · 20 km away
7. 1.63 km ENE of Clear Lake Riviera, CaliforniaTue, May 19, 1:45 AM PDT · 16570 days ago · 3 km deep · 21 km away
8. 2.37 km WSW of Cobb, CaliforniaMon, May 18, 5:17 AM PDT · 16571 days ago · 4 km deep · 1 km away
9. 2.04 km WSW of Cobb, CaliforniaSat, May 16, 10:43 PM PDT · 16572 days ago · 2 km deep · 3 km away
10. 1.714 km SW of Guinda, CaliforniaThu, May 14, 2:07 PM PDT · 16574 days ago · 5 km deep · 44 km away
11. 2.313 km WSW of Esparto, CaliforniaThu, May 14, 1:57 PM PDT · 16574 days ago · 4 km deep · 58 km away
12. 2.314 km S of Guinda, CaliforniaThu, May 14, 12:37 PM PDT · 16574 days ago · 4 km deep · 52 km away
13. 1.86 km ENE of Brooktrails, CaliforniaThu, May 14, 1:58 AM PDT · 16575 days ago · 7 km deep · 86 km away
14. 2.011 km E of Geyserville, CaliforniaWed, May 13, 10:52 PM PDT · 16575 days ago · 6 km deep · 11 km away
15. 2.16 km NE of Hidden Valley Lake, CaliforniaWed, May 13, 7:51 AM PDT · 16576 days ago · 57 km deep · 27 km away
16. 1.916 km WSW of Williams, CaliforniaTue, May 12, 5:01 PM PDT · 16576 days ago · 2 km deep · 54 km away
17. 1.75 km WSW of Lower Lake, CaliforniaTue, May 12, 10:54 AM PDT · 16576 days ago · 4 km deep · 16 km away
18. 1.77 km N of Hopland, CaliforniaMon, May 11, 5:17 PM PDT · 16577 days ago · 6 km deep · 37 km away
19. 1.62 km NE of Potter Valley, CaliforniaMon, May 11, 1:22 PM PDT · 16577 days ago · 4 km deep · 64 km away
20. 2.36 km W of Cobb, CaliforniaMon, May 11, 11:16 AM PDT · 16577 days ago · 3 km deep · 3 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1063852. Read Wed, Sep 30, 2026, 2:33 AM UTC.