M1.9 earthquake 8 km WSW of Cobb, California

Magnitude

1.9 (md), micro

Local time

Sun, Nov 30, 1975, 3:17 PM PST

UTC

1975-11-30 23:17:41 UTC

Depth

3.7 km (2.3 mi), shallow

Epicenter

38.797° N, 122.812° 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

±0.15

Depth from

From location

Station coverage gap

61°

Stations used

18

• Cobb, CaliforniaPopulation 1,778. Forecast8 kmWSW
• Healdsburg, CaliforniaPopulation 11,742. Forecast21 kmNNE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast40 kmNNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast667 kmNW

After

1. 2.35 km E of Vallejo, CaliforniaMon, Dec 1, 12:34 PM PST · 18558 days ago · 7 km deep · 93 km away
2. 1.7Northern CaliforniaTue, Dec 2, 8:33 AM PST · 18557 days ago · 9 km deep · 22 km away
3. 3.18 km NNW of Redwood Valley, CaliforniaThu, Dec 4, 4:56 PM PST · 18555 days ago · 12 km deep · 71 km away
4. 1.84 km SE of Clear Lake Riviera, CaliforniaThu, Dec 4, 10:58 PM PST · 18555 days ago · 2 km deep · 18 km away
5. 1.67 km W of Cobb, CaliforniaSun, Dec 7, 9:41 PM PST · 18552 days ago · 4 km deep · 2 km away
6. 2.16 km SSW of Boonville, CaliforniaMon, Dec 8, 4:56 PM PST · 18551 days ago · 6 km deep · 53 km away
7. 2.8Northern CaliforniaThu, Dec 11, 8:28 AM PST · 18548 days ago · 6 km deep · 21 km away
8. 1.6near the coast of Northern CaliforniaThu, Dec 11, 4:13 PM PST · 18548 days ago · 6 km deep · 40 km away
9. 2.33 km NNW of Larkfield-Wikiup, CaliforniaThu, Dec 11, 4:44 PM PST · 18548 days ago · 4 km deep · 29 km away
10. 1.64 km NW of Soda Bay, CaliforniaSun, Dec 14, 1:22 AM PST · 18546 days ago · 3 km deep · 26 km away
11. 3.16 km W of Cobb, CaliforniaSun, Dec 14, 2:35 PM PST · 18545 days ago · -1 km deep · 2 km away
12. 1.66 km W of Cobb, CaliforniaSun, Dec 14, 3:51 PM PST · 18545 days ago · 4 km deep · 2 km away
13. 1.9Northern CaliforniaMon, Dec 15, 7:53 AM PST · 18544 days ago · -1 km deep · 2 km away
14. 1.67 km W of Cobb, CaliforniaTue, Dec 16, 3:12 AM PST · 18543 days ago · 3 km deep · 2 km away
15. 2.48 km WSW of Cobb, CaliforniaWed, Dec 17, 2:03 AM PST · 18542 days ago · 3 km deep · 0 km away
16. 2.88 km ESE of Talmage, CaliforniaWed, Dec 17, 4:14 PM PST · 18542 days ago · 7 km deep · 40 km away
17. 2.07 km WSW of Hopland, CaliforniaSat, Dec 20, 12:48 AM PST · 18540 days ago · 5 km deep · 37 km away
18. 1.67 km WSW of Cobb, CaliforniaSat, Dec 20, 7:21 PM PST · 18539 days ago · 1 km deep · 1 km away
19. 2.17 km W of Cobb, CaliforniaMon, Dec 22, 3:17 AM PST · 18537 days ago · 0 km deep · 4 km away
20. 2.27 km W of Cobb, CaliforniaMon, Dec 22, 10:44 AM PST · 18537 days ago · 1 km deep · 3 km away
21. 2.222 km NE of Potter Valley, CaliforniaThu, Dec 25, 2:53 AM PST · 18534 days ago · 8 km deep · 72 km away
22. 3.318 km NE of Upper Lake, CaliforniaThu, Dec 25, 6:13 AM PST · 18534 days ago · 10 km deep · 56 km away
23. 2.220 km WSW of Stonyford, CaliforniaThu, Dec 25, 6:22 AM PST · 18534 days ago · 8 km deep · 58 km away
24. 2.26 km WSW of Cobb, CaliforniaSat, Dec 27, 12:16 AM PST · 18533 days ago · 3 km deep · 2 km away
25. 2.419 km NE of Upper Lake, CaliforniaSat, Dec 27, 11:51 AM PST · 18532 days ago · 9 km deep · 56 km away
26. 1.611 km NNE of Hopland, CaliforniaMon, Dec 29, 8:46 PM PST · 18530 days ago · 6 km deep · 37 km away
27. 1.5Northern CaliforniaWed, Dec 31, 3:44 PM PST · 18528 days ago · 3 km deep · 8 km away
28. 2.420 km WSW of Stonyford, CaliforniaSun, Jan 4, 4:36 AM PST · 18524 days ago · 6 km deep · 56 km away
29. 1.66 km W of Cobb, CaliforniaSun, Jan 4, 9:55 AM PST · 18524 days ago · 3 km deep · 2 km away
30. 1.64 km WSW of Cobb, CaliforniaSun, Jan 4, 1:07 PM PST · 18524 days ago · 1 km deep · 4 km away
31. 1.67 km W of Cobb, CaliforniaMon, Jan 5, 8:13 AM PST · 18523 days ago · 3 km deep · 2 km away
32. 1.56 km W of Cobb, CaliforniaMon, Jan 5, 12:34 PM PST · 18523 days ago · 0 km deep · 3 km away
33. 2.36 km E of Willits, CaliforniaMon, Jan 5, 11:57 PM PST · 18523 days ago · 2 km deep · 79 km away
34. 1.76 km W of Cobb, CaliforniaWed, Jan 7, 6:49 AM PST · 18521 days ago · 3 km deep · 3 km away
35. 2.18 km WSW of Cobb, CaliforniaSat, Jan 10, 12:38 AM PST · 18519 days ago · 3 km deep · 0 km away
36. 2.27 km W of Cobb, CaliforniaSat, Jan 10, 11:50 AM PST · 18518 days ago · 3 km deep · 1 km away
37. 1.64 km WSW of Cobb, CaliforniaTue, Jan 13, 3:00 PM PST · 18515 days ago · 1 km deep · 4 km away
38. 1.63 km SE of Clear Lake Riviera, CaliforniaWed, Jan 14, 12:16 PM PST · 18514 days ago · 0 km deep · 18 km away
39. 1.91 km WNW of Lakeport, CaliforniaThu, Jan 15, 3:55 AM PST · 18513 days ago · 19 km deep · 30 km away
40. 1.98 km WSW of Cobb, CaliforniaThu, Jan 15, 5:56 AM PST · 18513 days ago · 3 km deep · 0 km away
41. 2.08 km WSW of Cobb, CaliforniaThu, Jan 15, 5:58 AM PST · 18513 days ago · 4 km deep · 0 km away
42. 3.46 km W of North Lakeport, CaliforniaSat, Jan 17, 11:38 PM PST · 18511 days ago · 6 km deep · 36 km away
43. 3.36 km WSW of Cobb, CaliforniaSun, Jan 18, 11:25 AM PST · 18510 days ago · -1 km deep · 2 km away
44. 2.010 km W of Cobb, CaliforniaTue, Jan 20, 4:20 AM PST · 18508 days ago · 1 km deep · 4 km away
45. 1.78 km WSW of Cobb, CaliforniaTue, Jan 20, 11:31 AM PST · 18508 days ago · 4 km deep · 0 km away
46. 1.87 km WSW of Cobb, CaliforniaTue, Jan 20, 9:11 PM PST · 18508 days ago · 1 km deep · 1 km away
47. 1.77 km WSW of Cobb, CaliforniaTue, Jan 20, 10:45 PM PST · 18508 days ago · 1 km deep · 1 km away
48. 1.814 km NE of Nice, CaliforniaThu, Jan 22, 11:15 AM PST · 18506 days ago · 7 km deep · 47 km away
49. 2.517 km ENE of Potter Valley, CaliforniaThu, Jan 22, 5:03 PM PST · 18506 days ago · -1 km deep · 64 km away
50. 3.022 km ENE of Potter Valley, CaliforniaFri, Jan 23, 12:22 PM PST · 18505 days ago · 11 km deep · 66 km away
51. 2.54 km WSW of Cobb, CaliforniaMon, Jan 26, 5:08 PM PST · 18502 days ago · 4 km deep · 4 km away
52. 2.17 km WSW of Cobb, CaliforniaTue, Jan 27, 12:53 AM PST · 18502 days ago · 0 km deep · 1 km away

Before

1. 1.67 km W of Cobb, CaliforniaSun, Nov 30, 12:28 PM PST · 18559 days ago · 3 km deep · 2 km away
2. 1.61 km NE of Clear Lake Riviera, CaliforniaSat, Nov 29, 3:50 AM PST · 18560 days ago · 1 km deep · 21 km away
3. 1.76 km W of Cobb, CaliforniaFri, Nov 28, 8:30 AM PST · 18561 days ago · 0 km deep · 2 km away
4. 2.23 km NNW of Larkfield-Wikiup, CaliforniaThu, Nov 27, 7:59 PM PST · 18562 days ago · 5 km deep · 28 km away
5. 1.73 km ESE of Cloverdale, CaliforniaWed, Nov 26, 11:37 PM PST · 18563 days ago · 3 km deep · 14 km away
6. 1.911 km NE of Angwin, CaliforniaMon, Nov 24, 4:25 PM PST · 18565 days ago · 11 km deep · 42 km away
7. 1.94 km W of Cobb, CaliforniaMon, Nov 24, 11:20 AM PST · 18565 days ago · 4 km deep · 4 km away
8. 2.58 km ENE of Willits, CaliforniaSat, Nov 22, 12:54 AM PST · 18568 days ago · -1 km deep · 82 km away
9. 3.14 km ENE of Willits, CaliforniaSat, Nov 22, 12:33 AM PST · 18568 days ago · 10 km deep · 82 km away
10. 2.47 km NE of Sonoma, CaliforniaThu, Nov 20, 6:43 PM PST · 18569 days ago · 11 km deep · 62 km away
11. 1.76 km W of Cobb, CaliforniaWed, Nov 19, 5:09 PM PST · 18570 days ago · 4 km deep · 3 km away
12. 1.55 km SE of Clear Lake Riviera, CaliforniaWed, Nov 19, 3:32 AM PST · 18570 days ago · 2 km deep · 18 km away
13. 1.86 km W of Cobb, CaliforniaMon, Nov 17, 10:45 PM PST · 18572 days ago · 3 km deep · 3 km away
14. 2.28 km WSW of Cobb, CaliforniaMon, Nov 17, 12:10 PM PST · 18572 days ago · -1 km deep · 1 km away
15. 1.89 km NW of Cobb, CaliforniaSat, Nov 15, 8:20 PM PST · 18574 days ago · 2 km deep · 9 km away
16. 2.719 km SW of Stonyford, CaliforniaFri, Nov 14, 11:45 PM PST · 18575 days ago · 10 km deep · 52 km away
17. 1.66 km WSW of Cobb, CaliforniaWed, Nov 12, 6:15 AM PST · 18577 days ago · 1 km deep · 2 km away
18. 1.84 km WSW of Cobb, CaliforniaSun, Nov 9, 4:34 AM PST · 18580 days ago · 3 km deep · 3 km away
19. 1.56 km WSW of Cobb, CaliforniaSat, Nov 8, 8:04 PM PST · 18581 days ago · 1 km deep · 2 km away
20. 1.86 km W of Cobb, CaliforniaSat, Nov 8, 1:14 PM PST · 18581 days ago · 1 km deep · 3 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1027756. Read Tue, Sep 22, 2026, 8:52 PM UTC.