M1.6 earthquake 6 km W of Cobb, California

Magnitude

1.6 (md), micro

Local time

Wed, Dec 21, 1983, 4:34 AM PST

UTC

1983-12-21 12:34:49 UTC

Depth

3.4 km (2.1 mi), shallow

Epicenter

38.821° N, 122.796° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 0.7 km in depth

Magnitude uncertainty

±0.18

Depth from

From location

Station coverage gap

72°

Stations used

11

• Cobb, CaliforniaPopulation 1,778. Forecast6 kmW
• Clearlake, CaliforniaPopulation 15,182. Forecast21 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast43 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast668 kmNW

After

1. 1.86 km W of Cobb, CaliforniaFri, Jan 6, 8:42 PM PST · 15600 days ago · 3 km deep · 0 km away
2. 2.014 km NNW of Moskowite Corner, CaliforniaSat, Jan 7, 4:23 AM PST · 15599 days ago · 2 km deep · 55 km away
3. 2.017 km ENE of Potter Valley, CaliforniaSun, Jan 8, 11:56 AM PST · 15598 days ago · 7 km deep · 62 km away
4. 1.63 km ESE of Larkfield-Wikiup, CaliforniaSun, Jan 8, 12:04 PM PST · 15598 days ago · 8 km deep · 36 km away
5. 1.77 km WSW of Cobb, CaliforniaSun, Jan 8, 3:52 PM PST · 15598 days ago · 1 km deep · 2 km away
6. 2.26 km W of Cobb, CaliforniaSun, Jan 8, 10:13 PM PST · 15598 days ago · 3 km deep · 0 km away
7. 1.65 km NW of Napa, CaliforniaMon, Jan 9, 3:51 AM PST · 15597 days ago · 11 km deep · 68 km away
8. 1.78 km W of Cobb, CaliforniaMon, Jan 9, 11:30 AM PST · 15597 days ago · 8 km deep · 2 km away
9. 1.77 km W of Cobb, CaliforniaMon, Jan 9, 11:50 AM PST · 15597 days ago · 3 km deep · 1 km away
10. 2.6Northern CaliforniaMon, Jan 9, 4:36 PM PST · 15597 days ago · -1 km deep · 3 km away
11. 1.65 km SSW of Calistoga, CaliforniaTue, Jan 10, 8:00 AM PST · 15596 days ago · 6 km deep · 35 km away
12. 1.715 km NE of Angwin, CaliforniaTue, Jan 10, 9:17 PM PST · 15596 days ago · 20 km deep · 42 km away
13. 1.86 km ENE of Windsor, CaliforniaWed, Jan 11, 9:07 AM PST · 15595 days ago · 1 km deep · 27 km away
14. 2.16 km W of Cobb, CaliforniaWed, Jan 11, 9:34 AM PST · 15595 days ago · 1 km deep · 1 km away
15. 1.67 km WSW of Cobb, CaliforniaWed, Jan 11, 5:21 PM PST · 15595 days ago · 1 km deep · 2 km away
16. 1.818 km NNE of Upper Lake, CaliforniaWed, Jan 11, 6:07 PM PST · 15595 days ago · 7 km deep · 55 km away
17. 1.97 km S of Willows, CaliforniaWed, Jan 11, 10:36 PM PST · 15595 days ago · 24 km deep · 88 km away
18. 1.76 km W of Cobb, CaliforniaThu, Jan 12, 8:44 AM PST · 15594 days ago · 3 km deep · 0 km away
19. 2.36 km WSW of Cobb, CaliforniaThu, Jan 12, 9:58 AM PST · 15594 days ago · 0 km deep · 1 km away
20. 1.86 km WSW of Cobb, CaliforniaThu, Jan 12, 12:26 PM PST · 15594 days ago · 3 km deep · 2 km away
21. 1.96 km W of Cobb, CaliforniaThu, Jan 12, 7:06 PM PST · 15594 days ago · 4 km deep · 1 km away
22. 1.67 km ENE of Black Point-Green Point, CaliforniaFri, Jan 13, 5:04 AM PST · 15593 days ago · 16 km deep · 81 km away
23. 1.97 km WSW of Cobb, CaliforniaFri, Jan 13, 3:33 PM PST · 15593 days ago · 1 km deep · 2 km away
24. 2.57 km WSW of Cobb, CaliforniaFri, Jan 13, 4:11 PM PST · 15593 days ago · 1 km deep · 2 km away
25. 2.15 km SW of Cobb, CaliforniaFri, Jan 13, 7:52 PM PST · 15593 days ago · 0 km deep · 5 km away
26. 1.59 km WSW of Cobb, CaliforniaFri, Jan 13, 10:45 PM PST · 15593 days ago · 1 km deep · 4 km away
27. 1.97 km WSW of Cobb, CaliforniaSat, Jan 14, 8:28 AM PST · 15592 days ago · 2 km deep · 2 km away
28. 2.26 km W of Cobb, CaliforniaSat, Jan 14, 5:51 PM PST · 15592 days ago · 0 km deep · 1 km away
29. 1.6Northern CaliforniaSat, Jan 14, 9:11 PM PST · 15592 days ago · 1 km deep · 3 km away
30. 1.55 km WSW of Cobb, CaliforniaSun, Jan 15, 1:34 AM PST · 15592 days ago · 0 km deep · 3 km away
31. 1.77 km WSW of Cobb, CaliforniaSun, Jan 15, 6:52 AM PST · 15591 days ago · 1 km deep · 2 km away
32. 2.69 km WSW of Cobb, CaliforniaSun, Jan 15, 6:53 AM PST · 15591 days ago · 2 km deep · 3 km away
33. 1.75 km WSW of Cobb, CaliforniaSun, Jan 15, 7:11 AM PST · 15591 days ago · 3 km deep · 3 km away
34. 2.69 km WSW of Cobb, CaliforniaSun, Jan 15, 8:20 AM PST · 15591 days ago · 2 km deep · 3 km away
35. 1.621 km NE of Potter Valley, CaliforniaSun, Jan 15, 2:52 PM PST · 15591 days ago · 5 km deep · 70 km away
36. 1.57 km WSW of Cobb, CaliforniaTue, Jan 17, 5:24 PM PST · 15589 days ago · 3 km deep · 3 km away
37. 1.57 km WSW of Cobb, CaliforniaTue, Jan 17, 11:37 PM PST · 15589 days ago · 3 km deep · 3 km away
38. 1.68 km ENE of Hidden Valley Lake, CaliforniaWed, Jan 18, 11:15 AM PST · 15588 days ago · 7 km deep · 29 km away
39. 1.76 km W of Cobb, CaliforniaWed, Jan 18, 2:49 PM PST · 15588 days ago · 3 km deep · 0 km away
40. 2.46 km W of Cobb, CaliforniaWed, Jan 18, 10:24 PM PST · 15588 days ago · 3 km deep · 0 km away
41. 2.66 km W of Cobb, CaliforniaThu, Jan 19, 5:30 AM PST · 15587 days ago · 2 km deep · 1 km away
42. 1.77 km W of Cobb, CaliforniaThu, Jan 19, 6:39 AM PST · 15587 days ago · 3 km deep · 1 km away
43. 1.714 km S of Lodoga, CaliforniaThu, Jan 19, 6:58 AM PST · 15587 days ago · 15 km deep · 47 km away
44. 1.64 km SSW of Cobb, CaliforniaThu, Jan 19, 12:01 PM PST · 15587 days ago · -1 km deep · 7 km away
45. 2.36 km W of Cobb, CaliforniaThu, Jan 19, 9:34 PM PST · 15587 days ago · 1 km deep · 1 km away
46. 1.69 km SSE of Sea Ranch, CaliforniaFri, Jan 20, 5:09 AM PST · 15586 days ago · 2 km deep · 56 km away
47. 1.914 km NE of Upper Lake, CaliforniaFri, Jan 20, 6:25 AM PST · 15586 days ago · 7 km deep · 50 km away
48. 1.97 km WSW of Cobb, CaliforniaFri, Jan 20, 3:47 PM PST · 15586 days ago · 2 km deep · 2 km away
49. 2.07 km W of Cobb, CaliforniaFri, Jan 20, 6:35 PM PST · 15586 days ago · 3 km deep · 2 km away
50. 1.612 km NNW of Moskowite Corner, CaliforniaFri, Jan 20, 9:15 PM PST · 15586 days ago · 2 km deep · 57 km away
51. 1.622 km NE of Potter Valley, CaliforniaFri, Jan 20, 10:40 PM PST · 15586 days ago · 7 km deep · 74 km away
52. 1.68 km WSW of Cobb, CaliforniaSat, Jan 21, 1:37 PM PST · 15585 days ago · 3 km deep · 3 km away
53. 2.14 km NW of Kelseyville, CaliforniaSat, Jan 21, 8:18 PM PST · 15585 days ago · 4 km deep · 22 km away
54. 1.65 km WSW of Cobb, CaliforniaSat, Jan 21, 10:18 PM PST · 15585 days ago · 1 km deep · 2 km away
55. 2.26 km W of Cobb, CaliforniaSun, Jan 22, 10:30 PM PST · 15584 days ago · 3 km deep · 1 km away
56. 1.68 km WSW of Cobb, CaliforniaSun, Jan 22, 10:58 PM PST · 15584 days ago · 3 km deep · 3 km away
57. 2.46 km W of Cobb, CaliforniaSun, Jan 22, 11:52 PM PST · 15584 days ago · 3 km deep · 0 km away
58. 1.76 km W of Cobb, CaliforniaSun, Jan 22, 11:52 PM PST · 15584 days ago · 3 km deep · 0 km away
59. 1.70 km ESE of Crockett, CaliforniaMon, Jan 23, 5:47 AM PST · 15583 days ago · 9 km deep · 100 km away
60. 1.9near the coast of Northern CaliforniaTue, Jan 24, 4:39 PM PST · 15582 days ago · 8 km deep · 76 km away

The first 60 of 167.

From the USGS Earthquake Hazards Program and its partner networks, event nc1108809. Read Tue, Sep 22, 2026, 10:23 PM UTC.