M2.1 earthquake 7 km W of Cobb, California

Magnitude

2.1 (md), micro

Local time

Mon, Dec 22, 1975, 3:17 AM PST

UTC

1975-12-22 11:17:00 UTC

Depth

0.5 km (0.3 mi), shallow

Epicenter

38.832° N, 122.813° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.5 km in depth

Magnitude uncertainty

±0.23

Depth from

From location

Station coverage gap

48°

Stations used

18

• Cobb, CaliforniaPopulation 1,778. Forecast8 kmW
• Clearlake, CaliforniaPopulation 15,182. Forecast21 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast44 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast670 kmNW

After

1. 2.27 km W of Cobb, CaliforniaMon, Dec 22, 10:44 AM PST · 18537 days ago · 1 km deep · 1 km away
2. 2.222 km NE of Potter Valley, CaliforniaThu, Dec 25, 2:53 AM PST · 18535 days ago · 8 km deep · 68 km away
3. 3.318 km NE of Upper Lake, CaliforniaThu, Dec 25, 6:13 AM PST · 18534 days ago · 10 km deep · 52 km away
4. 2.220 km WSW of Stonyford, CaliforniaThu, Dec 25, 6:22 AM PST · 18534 days ago · 8 km deep · 54 km away
5. 2.26 km WSW of Cobb, CaliforniaSat, Dec 27, 12:16 AM PST · 18533 days ago · 3 km deep · 3 km away
6. 2.419 km NE of Upper Lake, CaliforniaSat, Dec 27, 11:51 AM PST · 18532 days ago · 9 km deep · 52 km away
7. 1.611 km NNE of Hopland, CaliforniaMon, Dec 29, 8:46 PM PST · 18530 days ago · 6 km deep · 33 km away
8. 1.5Northern CaliforniaWed, Dec 31, 3:44 PM PST · 18528 days ago · 3 km deep · 9 km away
9. 2.420 km WSW of Stonyford, CaliforniaSun, Jan 4, 4:36 AM PST · 18524 days ago · 6 km deep · 52 km away
10. 1.66 km W of Cobb, CaliforniaSun, Jan 4, 9:55 AM PST · 18524 days ago · 3 km deep · 3 km away
11. 1.64 km WSW of Cobb, CaliforniaSun, Jan 4, 1:07 PM PST · 18524 days ago · 1 km deep · 5 km away
12. 1.67 km W of Cobb, CaliforniaMon, Jan 5, 8:13 AM PST · 18523 days ago · 3 km deep · 2 km away
13. 1.56 km W of Cobb, CaliforniaMon, Jan 5, 12:34 PM PST · 18523 days ago · 0 km deep · 2 km away
14. 2.36 km E of Willits, CaliforniaMon, Jan 5, 11:57 PM PST · 18523 days ago · 2 km deep · 75 km away
15. 1.76 km W of Cobb, CaliforniaWed, Jan 7, 6:49 AM PST · 18521 days ago · 3 km deep · 2 km away
16. 2.18 km WSW of Cobb, CaliforniaSat, Jan 10, 12:38 AM PST · 18519 days ago · 3 km deep · 4 km away
17. 2.27 km W of Cobb, CaliforniaSat, Jan 10, 11:50 AM PST · 18518 days ago · 3 km deep · 3 km away
18. 1.64 km WSW of Cobb, CaliforniaTue, Jan 13, 3:00 PM PST · 18515 days ago · 1 km deep · 5 km away
19. 1.63 km SE of Clear Lake Riviera, CaliforniaWed, Jan 14, 12:16 PM PST · 18514 days ago · 0 km deep · 15 km away
20. 1.91 km WNW of Lakeport, CaliforniaThu, Jan 15, 3:55 AM PST · 18513 days ago · 19 km deep · 26 km away
21. 1.98 km WSW of Cobb, CaliforniaThu, Jan 15, 5:56 AM PST · 18513 days ago · 3 km deep · 4 km away
22. 2.08 km WSW of Cobb, CaliforniaThu, Jan 15, 5:58 AM PST · 18513 days ago · 4 km deep · 4 km away
23. 3.46 km W of North Lakeport, CaliforniaSat, Jan 17, 11:38 PM PST · 18511 days ago · 6 km deep · 32 km away
24. 3.36 km WSW of Cobb, CaliforniaSun, Jan 18, 11:25 AM PST · 18510 days ago · -1 km deep · 3 km away
25. 2.010 km W of Cobb, CaliforniaTue, Jan 20, 4:20 AM PST · 18508 days ago · 1 km deep · 3 km away
26. 1.78 km WSW of Cobb, CaliforniaTue, Jan 20, 11:31 AM PST · 18508 days ago · 4 km deep · 4 km away
27. 1.87 km WSW of Cobb, CaliforniaTue, Jan 20, 9:11 PM PST · 18508 days ago · 1 km deep · 3 km away
28. 1.77 km WSW of Cobb, CaliforniaTue, Jan 20, 10:45 PM PST · 18508 days ago · 1 km deep · 4 km away
29. 1.814 km NE of Nice, CaliforniaThu, Jan 22, 11:15 AM PST · 18506 days ago · 7 km deep · 44 km away
30. 2.517 km ENE of Potter Valley, CaliforniaThu, Jan 22, 5:03 PM PST · 18506 days ago · -1 km deep · 60 km away
31. 3.022 km ENE of Potter Valley, CaliforniaFri, Jan 23, 12:22 PM PST · 18505 days ago · 11 km deep · 62 km away
32. 2.54 km WSW of Cobb, CaliforniaMon, Jan 26, 5:08 PM PST · 18502 days ago · 4 km deep · 5 km away
33. 2.17 km WSW of Cobb, CaliforniaTue, Jan 27, 12:53 AM PST · 18502 days ago · 0 km deep · 3 km away
34. 1.614 km SSE of Boonville, CaliforniaSat, Jan 31, 5:10 PM PST · 18497 days ago · 4 km deep · 41 km away
35. 2.319 km ENE of Potter Valley, CaliforniaSun, Feb 1, 5:13 AM PST · 18496 days ago · 10 km deep · 63 km away
36. 2.422 km NE of Potter Valley, CaliforniaSun, Feb 1, 6:13 AM PST · 18496 days ago · 9 km deep · 69 km away
37. 2.07 km W of Cobb, CaliforniaSun, Feb 1, 5:38 PM PST · 18496 days ago · 1 km deep · 2 km away
38. 1.82 km S of Clearlake, CaliforniaMon, Feb 2, 5:04 AM PST · 18495 days ago · 3 km deep · 19 km away
39. 1.77 km W of Cobb, CaliforniaMon, Feb 2, 2:32 PM PST · 18495 days ago · 3 km deep · 2 km away
40. 1.72 km N of Larkfield-Wikiup, CaliforniaWed, Feb 4, 5:05 AM PST · 18493 days ago · 8 km deep · 33 km away
41. 1.88 km SE of Hopland, CaliforniaFri, Feb 6, 3:37 PM PST · 18491 days ago · 1 km deep · 22 km away
42. 2.16 km W of Cobb, CaliforniaFri, Feb 6, 7:56 PM PST · 18491 days ago · 1 km deep · 1 km away
43. 1.76 km W of Cobb, CaliforniaSat, Feb 7, 9:00 AM PST · 18490 days ago · 4 km deep · 2 km away
44. 1.55 km E of Cloverdale, CaliforniaSun, Feb 8, 6:44 AM PST · 18489 days ago · 0 km deep · 12 km away
45. 2.316 km NE of Nice, CaliforniaSun, Feb 8, 8:24 AM PST · 18489 days ago · 8 km deep · 45 km away
46. 1.77 km W of Cobb, CaliforniaSun, Feb 8, 9:10 AM PST · 18489 days ago · 3 km deep · 1 km away
47. 1.67 km WSW of Cobb, CaliforniaTue, Feb 10, 10:55 PM PST · 18487 days ago · 3 km deep · 3 km away
48. 2.63 km NE of Santa Rosa, CaliforniaThu, Feb 12, 7:21 AM PST · 18485 days ago · 8 km deep · 42 km away
49. 3.614 km SSW of Willits, CaliforniaSun, Feb 15, 11:12 AM PST · 18482 days ago · 11 km deep · 71 km away
50. 2.57 km W of Cobb, CaliforniaSun, Feb 15, 5:10 PM PST · 18482 days ago · 4 km deep · 2 km away
51. 2.17 km W of Cobb, CaliforniaSun, Feb 15, 5:10 PM PST · 18482 days ago · 3 km deep · 2 km away
52. 1.87 km W of Cobb, CaliforniaSun, Feb 15, 5:16 PM PST · 18482 days ago · 3 km deep · 2 km away
53. 1.74 km WSW of Cobb, CaliforniaTue, Feb 17, 4:32 AM PST · 18480 days ago · 2 km deep · 5 km away
54. 1.96 km WSW of Cobb, CaliforniaTue, Feb 17, 6:42 PM PST · 18480 days ago · 1 km deep · 3 km away
55. 2.16 km W of Cobb, CaliforniaThu, Feb 19, 1:41 PM PST · 18478 days ago · 3 km deep · 2 km away

Before

1. 1.67 km WSW of Cobb, CaliforniaSat, Dec 20, 7:21 PM PST · 18539 days ago · 1 km deep · 3 km away
2. 2.07 km WSW of Hopland, CaliforniaSat, Dec 20, 12:48 AM PST · 18540 days ago · 5 km deep · 35 km away
3. 2.88 km ESE of Talmage, CaliforniaWed, Dec 17, 4:14 PM PST · 18542 days ago · 7 km deep · 37 km away
4. 2.48 km WSW of Cobb, CaliforniaWed, Dec 17, 2:03 AM PST · 18543 days ago · 3 km deep · 4 km away
5. 1.67 km W of Cobb, CaliforniaTue, Dec 16, 3:12 AM PST · 18543 days ago · 3 km deep · 2 km away
6. 1.9Northern CaliforniaMon, Dec 15, 7:53 AM PST · 18544 days ago · -1 km deep · 4 km away
7. 1.66 km W of Cobb, CaliforniaSun, Dec 14, 3:51 PM PST · 18545 days ago · 4 km deep · 2 km away
8. 3.16 km W of Cobb, CaliforniaSun, Dec 14, 2:35 PM PST · 18545 days ago · -1 km deep · 3 km away
9. 1.64 km NW of Soda Bay, CaliforniaSun, Dec 14, 1:22 AM PST · 18546 days ago · 3 km deep · 22 km away
10. 2.33 km NNW of Larkfield-Wikiup, CaliforniaThu, Dec 11, 4:44 PM PST · 18548 days ago · 4 km deep · 33 km away
11. 1.6near the coast of Northern CaliforniaThu, Dec 11, 4:13 PM PST · 18548 days ago · 6 km deep · 39 km away
12. 2.8Northern CaliforniaThu, Dec 11, 8:28 AM PST · 18548 days ago · 6 km deep · 25 km away
13. 2.16 km SSW of Boonville, CaliforniaMon, Dec 8, 4:56 PM PST · 18551 days ago · 6 km deep · 52 km away
14. 1.67 km W of Cobb, CaliforniaSun, Dec 7, 9:41 PM PST · 18552 days ago · 4 km deep · 2 km away
15. 1.84 km SE of Clear Lake Riviera, CaliforniaThu, Dec 4, 10:58 PM PST · 18555 days ago · 2 km deep · 15 km away
16. 3.18 km NNW of Redwood Valley, CaliforniaThu, Dec 4, 4:56 PM PST · 18555 days ago · 12 km deep · 67 km away
17. 1.7Northern CaliforniaTue, Dec 2, 8:33 AM PST · 18557 days ago · 9 km deep · 26 km away
18. 2.35 km E of Vallejo, CaliforniaMon, Dec 1, 12:34 PM PST · 18558 days ago · 7 km deep · 97 km away
19. 1.98 km WSW of Cobb, CaliforniaSun, Nov 30, 3:17 PM PST · 18559 days ago · 4 km deep · 4 km away
20. 1.67 km W of Cobb, CaliforniaSun, Nov 30, 12:28 PM PST · 18559 days ago · 3 km deep · 2 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1028022. Read Tue, Sep 22, 2026, 10:30 PM UTC.