M2.4 earthquake 4 km WSW of Cobb, California

Magnitude

2.4 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Wed, Feb 9, 1977, 8:38 PM PST

UTC

1977-02-10 04:38:06 UTC

Depth

1.2 km (0.7 mi), shallow

Epicenter

38.806° N, 122.771° 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

±0.04

Depth from

From location

Station coverage gap

52°

Stations used

26

• Cobb, CaliforniaPopulation 1,778. Forecast5 kmWSW
• Clearlake, CaliforniaPopulation 15,182. Forecast21 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast41 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast666 kmNW

After

1. 2.113 km NNE of Angwin, CaliforniaWed, Feb 9, 10:26 PM PST · 18133 days ago · 12 km deep · 36 km away
2. 3.07 km WSW of Cobb, CaliforniaThu, Feb 10, 11:18 AM PST · 18132 days ago · 2 km deep · 3 km away
3. 2.39 km ESE of Black Point-Green Point, CaliforniaSat, Feb 12, 6:50 PM PST · 18130 days ago · 12 km deep · 86 km away
4. 1.88 km W of Cobb, CaliforniaSun, Feb 13, 8:04 AM PST · 18130 days ago · 0 km deep · 4 km away
5. 2.24 km ESE of Santa Rosa, CaliforniaMon, Feb 14, 2:37 AM PST · 18129 days ago · 10 km deep · 43 km away
6. 1.99 km WSW of Cobb, CaliforniaMon, Feb 14, 1:35 PM PST · 18128 days ago · 0 km deep · 5 km away
7. 1.76 km ENE of Vallejo, CaliforniaMon, Feb 14, 3:46 PM PST · 18128 days ago · 2 km deep · 91 km away
8. 2.87 km SSE of Dunnigan, CaliforniaMon, Feb 14, 6:19 PM PST · 18128 days ago · 9 km deep · 72 km away
9. 2.2Northern CaliforniaMon, Feb 14, 8:09 PM PST · 18128 days ago · 3 km deep · 4 km away
10. 2.87 km SSE of Dunnigan, CaliforniaMon, Feb 14, 9:42 PM PST · 18128 days ago · 10 km deep · 72 km away
11. 1.67 km W of Cobb, CaliforniaTue, Feb 15, 8:32 PM PST · 18127 days ago · 3 km deep · 4 km away
12. 1.77 km ENE of Larkfield-Wikiup, CaliforniaFri, Feb 18, 1:35 AM PST · 18125 days ago · 6 km deep · 32 km away
13. 2.16 km W of Cobb, CaliforniaFri, Feb 18, 3:54 AM PST · 18125 days ago · 3 km deep · 3 km away
14. 3.28 km ESE of Willits, CaliforniaMon, Feb 21, 3:09 AM PST · 18122 days ago · 14 km deep · 77 km away
15. 1.64 km WSW of Cobb, CaliforniaTue, Feb 22, 7:40 AM PST · 18121 days ago · 1 km deep · 0 km away
16. 2.17 km WSW of Cobb, CaliforniaWed, Feb 23, 4:39 AM PST · 18120 days ago · 4 km deep · 3 km away
17. 1.913 km NNE of Angwin, CaliforniaWed, Feb 23, 2:32 PM PST · 18119 days ago · 9 km deep · 35 km away
18. 2.46 km W of Cobb, CaliforniaThu, Feb 24, 3:01 AM PST · 18119 days ago · 4 km deep · 3 km away
19. 1.52 km ESE of Boonville, CaliforniaThu, Feb 24, 1:10 PM PST · 18118 days ago · 8 km deep · 54 km away
20. 1.62 km ESE of Boonville, CaliforniaThu, Feb 24, 2:18 PM PST · 18118 days ago · 6 km deep · 54 km away
21. 2.66 km E of Larkfield-Wikiup, CaliforniaThu, Feb 24, 2:40 PM PST · 18118 days ago · 6 km deep · 33 km away
22. 2.22 km ESE of Boonville, CaliforniaThu, Feb 24, 3:23 PM PST · 18118 days ago · 7 km deep · 54 km away
23. 2.02 km ESE of Boonville, CaliforniaThu, Feb 24, 3:36 PM PST · 18118 days ago · 6 km deep · 54 km away
24. 2.46 km W of Cobb, CaliforniaSat, Feb 26, 8:06 AM PST · 18117 days ago · 0 km deep · 3 km away
25. 2.426 km ENE of Potter Valley, CaliforniaSun, Feb 27, 9:25 AM PST · 18115 days ago · 5 km deep · 72 km away
26. 2.512 km E of Geyserville, CaliforniaSun, Feb 27, 11:17 AM PST · 18115 days ago · 8 km deep · 11 km away
27. 2.87 km ENE of Willits, CaliforniaTue, Mar 1, 1:32 AM PST · 18114 days ago · -1 km deep · 84 km away
28. 2.622 km ENE of Potter Valley, CaliforniaTue, Mar 1, 10:29 PM PST · 18113 days ago · 8 km deep · 71 km away
29. 1.67 km W of Cobb, CaliforniaWed, Mar 2, 2:22 PM PST · 18112 days ago · 3 km deep · 3 km away
30. 2.18 km W of Cobb, CaliforniaThu, Mar 3, 10:57 PM PST · 18111 days ago · -1 km deep · 5 km away
31. 1.61 km SW of Geyserville, CaliforniaFri, Mar 4, 5:36 AM PST · 18111 days ago · 5 km deep · 18 km away
32. 1.61 km SW of Geyserville, CaliforniaFri, Mar 4, 9:06 AM PST · 18111 days ago · 2 km deep · 18 km away
33. 1.62 km SW of Geyserville, CaliforniaFri, Mar 4, 11:29 AM PST · 18110 days ago · 3 km deep · 18 km away
34. 2.711 km ESE of Hidden Valley Lake, CaliforniaSat, Mar 5, 3:43 AM PST · 18110 days ago · 6 km deep · 30 km away
35. 1.54 km WSW of Cobb, CaliforniaSat, Mar 5, 4:04 AM PST · 18110 days ago · 1 km deep · 0 km away
36. 2.07 km W of Cobb, CaliforniaSun, Mar 6, 2:31 AM PST · 18109 days ago · 4 km deep · 3 km away
37. 2.43 km NNE of Santa Rosa, CaliforniaSun, Mar 6, 12:40 PM PST · 18108 days ago · 8 km deep · 38 km away
38. 2.13 km ESE of Cloverdale, CaliforniaSun, Mar 6, 3:33 PM PST · 18108 days ago · 6 km deep · 18 km away
39. 1.63 km ESE of Cloverdale, CaliforniaWed, Mar 9, 6:00 AM PST · 18106 days ago · 6 km deep · 18 km away
40. 2.38 km WSW of Cobb, CaliforniaThu, Mar 10, 5:13 AM PST · 18105 days ago · 0 km deep · 4 km away
41. 1.7Northern CaliforniaThu, Mar 10, 9:45 AM PST · 18104 days ago · 1 km deep · 4 km away
42. 1.62 km ESE of Boonville, CaliforniaFri, Mar 11, 12:18 AM PST · 18104 days ago · 5 km deep · 54 km away
43. 1.72 km SE of North Lakeport, CaliforniaFri, Mar 11, 9:41 PM PST · 18103 days ago · 1 km deep · 31 km away
44. 2.118 km NE of Nice, CaliforniaSun, Mar 13, 12:44 AM PST · 18102 days ago · 8 km deep · 48 km away
45. 2.910 km NNE of Brooktrails, CaliforniaTue, Mar 15, 12:40 PM PST · 18099 days ago · 3 km deep · 93 km away
46. 1.74 km WSW of Cobb, CaliforniaTue, Mar 15, 4:37 PM PST · 18099 days ago · 1 km deep · 0 km away
47. 1.74 km WSW of Cobb, CaliforniaTue, Mar 15, 4:58 PM PST · 18099 days ago · 1 km deep · 0 km away
48. 1.84 km WSW of Cobb, CaliforniaTue, Mar 15, 5:11 PM PST · 18099 days ago · 1 km deep · 0 km away
49. 1.98 km W of Saint Helena, CaliforniaFri, Mar 18, 7:18 AM PST · 18097 days ago · 7 km deep · 38 km away
50. 1.96 km W of Cobb, CaliforniaFri, Mar 18, 9:14 AM PST · 18096 days ago · 3 km deep · 3 km away
51. 2.721 km NNE of Upper Lake, CaliforniaSat, Mar 19, 4:37 AM PST · 18096 days ago · 10 km deep · 58 km away
52. 2.40 km WSW of Larkfield-Wikiup, CaliforniaSat, Mar 19, 6:16 AM PST · 18096 days ago · 2 km deep · 33 km away
53. 1.96 km W of Cobb, CaliforniaSun, Mar 20, 11:46 PM PST · 18094 days ago · 2 km deep · 2 km away
54. 1.86 km W of Cobb, CaliforniaMon, Mar 21, 1:48 AM PST · 18094 days ago · 3 km deep · 3 km away
55. 1.75 km WSW of Cobb, CaliforniaMon, Mar 21, 2:39 PM PST · 18093 days ago · 4 km deep · 1 km away
56. 2.18 km WSW of Cobb, CaliforniaTue, Mar 22, 5:06 PM PST · 18092 days ago · 4 km deep · 4 km away
57. 2.06 km S of Calistoga, CaliforniaTue, Mar 22, 11:05 PM PST · 18092 days ago · 5 km deep · 35 km away
58. 2.421 km NNE of Upper Lake, CaliforniaWed, Mar 23, 12:39 PM PST · 18091 days ago · 8 km deep · 60 km away
59. 2.46 km W of Cobb, CaliforniaWed, Mar 23, 1:10 PM PST · 18091 days ago · 3 km deep · 3 km away
60. 2.26 km S of Moskowite Corner, CaliforniaThu, Mar 24, 2:39 AM PST · 18091 days ago · 12 km deep · 68 km away

The first 60 of 78.

Before

1. 2.217 km NE of Nice, CaliforniaWed, Feb 9, 8:09 PM PST · 18133 days ago · 9 km deep · 48 km away
2. 2.27 km W of Cobb, CaliforniaWed, Feb 9, 5:39 PM PST · 18133 days ago · 3 km deep · 4 km away
3. 1.95 km SW of Clearlake, CaliforniaWed, Feb 9, 2:13 AM PST · 18134 days ago · 2 km deep · 16 km away
4. 2.03 km WSW of Cobb, CaliforniaWed, Feb 2, 9:27 AM PST · 18140 days ago · 2 km deep · 1 km away
5. 1.610 km WSW of Cobb, CaliforniaTue, Feb 1, 6:20 PM PST · 18141 days ago · 1 km deep · 6 km away
6. 1.90 km SSE of Lakeport, CaliforniaSun, Jan 30, 5:22 AM PST · 18144 days ago · 1 km deep · 29 km away
7. 1.77 km WSW of Cobb, CaliforniaFri, Jan 28, 11:53 PM PST · 18145 days ago · 2 km deep · 3 km away
8. 2.77 km WSW of Cobb, CaliforniaThu, Jan 27, 6:03 PM PST · 18146 days ago · 4 km deep · 3 km away
9. 1.96 km WSW of Cobb, CaliforniaThu, Jan 27, 1:00 PM PST · 18146 days ago · 1 km deep · 2 km away
10. 2.12 km ENE of Santa Rosa, CaliforniaWed, Jan 26, 8:43 PM PST · 18147 days ago · 9 km deep · 40 km away
11. 1.917 km NNE of Angwin, CaliforniaMon, Jan 24, 5:43 AM PST · 18150 days ago · 10 km deep · 35 km away
12. 2.17 km W of Cobb, CaliforniaFri, Jan 21, 6:38 AM PST · 18153 days ago · 3 km deep · 4 km away
13. 1.57 km WSW of Cobb, CaliforniaThu, Jan 20, 7:10 PM PST · 18153 days ago · 3 km deep · 3 km away
14. 1.57 km WSW of Cobb, CaliforniaThu, Jan 20, 9:48 AM PST · 18153 days ago · 0 km deep · 3 km away
15. 1.63 km N of Larkfield-Wikiup, CaliforniaWed, Jan 19, 11:52 PM PST · 18154 days ago · 6 km deep · 29 km away
16. 2.23 km NNW of Larkfield-Wikiup, CaliforniaWed, Jan 19, 5:33 AM PST · 18155 days ago · 7 km deep · 29 km away
17. 2.43 km NNW of Larkfield-Wikiup, CaliforniaWed, Jan 19, 4:30 AM PST · 18155 days ago · 7 km deep · 29 km away
18. 1.67 km W of Cobb, CaliforniaTue, Jan 18, 8:35 PM PST · 18155 days ago · 3 km deep · 3 km away
19. 1.74 km WSW of Cobb, CaliforniaTue, Jan 18, 2:14 PM PST · 18155 days ago · 1 km deep · 0 km away
20. 2.320 km WSW of Stonyford, CaliforniaTue, Jan 18, 1:11 PM PST · 18155 days ago · 0 km deep · 58 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1033813. Read Sun, Oct 4, 2026, 4:41 AM UTC.