M2.8 earthquake 6 km W of Cobb, California

Magnitude

2.8 (md), micro

Local time

Tue, Dec 1, 1987, 8:28 PM PST

UTC

1987-12-02 04:28:29 UTC

Depth

1.1 km (0.7 mi), shallow

Epicenter

38.828° N, 122.799° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 0.4 km in depth

Magnitude uncertainty

±0.10

Depth from

From location

Station coverage gap

45°

Stations used

28

• Cobb, CaliforniaPopulation 1,778. Forecast7 kmW
• Clearlake, CaliforniaPopulation 15,182. Forecast21 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast44 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast669 kmNW

After

1. 1.79 km ESE of Hidden Valley Lake, CaliforniaSun, Dec 6, 4:40 PM PST · 14170 days ago · 7 km deep · 30 km away
2. 1.94 km WSW of Cobb, CaliforniaMon, Dec 7, 1:56 AM PST · 14169 days ago · 1 km deep · 3 km away
3. 1.94 km WSW of Cobb, CaliforniaMon, Dec 7, 11:32 AM PST · 14169 days ago · 2 km deep · 3 km away
4. 1.97 km SW of Cobb, CaliforniaTue, Dec 8, 12:04 AM PST · 14168 days ago · -1 km deep · 7 km away
5. 2.16 km W of Cobb, CaliforniaTue, Dec 8, 12:35 AM PST · 14168 days ago · 3 km deep · 1 km away
6. 1.68 km WNW of American Canyon, CaliforniaTue, Dec 8, 2:37 AM PST · 14168 days ago · 13 km deep · 80 km away
7. 3.25 km SW of Cobb, CaliforniaTue, Dec 8, 7:32 AM PST · 14168 days ago · 1 km deep · 6 km away
8. 1.65 km SW of Cobb, CaliforniaTue, Dec 8, 7:35 AM PST · 14168 days ago · -1 km deep · 6 km away
9. 2.08 km W of Cobb, CaliforniaTue, Dec 8, 6:13 PM PST · 14167 days ago · 1 km deep · 2 km away
10. 1.68 km W of Cobb, CaliforniaWed, Dec 9, 12:40 AM PST · 14167 days ago · 4 km deep · 2 km away
11. 1.78 km W of Cobb, CaliforniaWed, Dec 9, 9:12 PM PST · 14166 days ago · 2 km deep · 1 km away
12. 1.94 km WSW of Cobb, CaliforniaWed, Dec 9, 10:14 PM PST · 14166 days ago · -1 km deep · 3 km away
13. 2.9near the coast of Northern CaliforniaThu, Dec 10, 8:52 AM PST · 14166 days ago · -1 km deep · 73 km away
14. 1.7Northern CaliforniaThu, Dec 10, 2:24 PM PST · 14166 days ago · 2 km deep · 3 km away
15. 2.16 km WSW of Cobb, CaliforniaFri, Dec 11, 12:24 PM PST · 14165 days ago · 3 km deep · 2 km away
16. 1.64 km WSW of Cobb, CaliforniaSat, Dec 12, 10:06 PM PST · 14163 days ago · 0 km deep · 4 km away
17. 2.06 km SW of Cobb, CaliforniaSun, Dec 13, 3:03 AM PST · 14163 days ago · 1 km deep · 5 km away
18. 1.96 km SW of Cobb, CaliforniaSun, Dec 13, 3:07 AM PST · 14163 days ago · 1 km deep · 5 km away
19. 1.75 km SW of Cobb, CaliforniaSun, Dec 13, 3:43 AM PST · 14163 days ago · 1 km deep · 5 km away
20. 1.75 km WNW of Cobb, CaliforniaSun, Dec 13, 3:44 AM PST · 14163 days ago · 4 km deep · 2 km away
21. 1.68 km W of Cobb, CaliforniaSun, Dec 13, 7:05 AM PST · 14163 days ago · 0 km deep · 3 km away
22. 1.67 km WSW of Cobb, CaliforniaSun, Dec 13, 2:06 PM PST · 14163 days ago · 4 km deep · 3 km away
23. 2.15 km W of Cobb, CaliforniaSun, Dec 13, 2:36 PM PST · 14163 days ago · 3 km deep · 1 km away
24. 1.86 km W of Cobb, CaliforniaSun, Dec 13, 2:51 PM PST · 14163 days ago · 2 km deep · 1 km away
25. 1.77 km W of Cobb, CaliforniaMon, Dec 14, 8:38 PM PST · 14161 days ago · 0 km deep · 1 km away
26. 1.76 km W of Cobb, CaliforniaTue, Dec 15, 12:24 AM PST · 14161 days ago · 2 km deep · 1 km away
27. 1.89 km S of Moskowite Corner, CaliforniaTue, Dec 15, 3:07 AM PST · 14161 days ago · 8 km deep · 74 km away
28. 1.76 km W of Cobb, CaliforniaTue, Dec 15, 4:30 AM PST · 14161 days ago · 3 km deep · 1 km away
29. 2.14 km S of Cobb, CaliforniaTue, Dec 15, 2:32 PM PST · 14161 days ago · 1 km deep · 9 km away
30. 1.64 km ESE of Santa Rosa, CaliforniaTue, Dec 15, 4:22 PM PST · 14161 days ago · 9 km deep · 46 km away
31. 1.77 km WSW of Cobb, CaliforniaTue, Dec 15, 10:28 PM PST · 14160 days ago · -1 km deep · 3 km away
32. 2.918 km NNE of Upper Lake, CaliforniaWed, Dec 16, 5:02 PM PST · 14159 days ago · 3 km deep · 55 km away
33. 2.27 km W of Cobb, CaliforniaWed, Dec 16, 8:03 PM PST · 14159 days ago · 3 km deep · 1 km away
34. 1.85 km WNW of Cobb, CaliforniaThu, Dec 17, 2:58 AM PST · 14159 days ago · 2 km deep · 2 km away
35. 1.66 km S of Cobb, CaliforniaThu, Dec 17, 3:15 AM PST · 14159 days ago · -1 km deep · 9 km away
36. 1.79 km W of Cobb, CaliforniaThu, Dec 17, 9:25 PM PST · 14158 days ago · -1 km deep · 3 km away
37. 1.86 km WSW of Cobb, CaliforniaThu, Dec 17, 10:41 PM PST · 14158 days ago · 3 km deep · 2 km away
38. 1.55 km SW of Cobb, CaliforniaSat, Dec 19, 2:00 AM PST · 14157 days ago · 1 km deep · 5 km away
39. 1.96 km WSW of Cobb, CaliforniaSat, Dec 19, 4:22 AM PST · 14157 days ago · 4 km deep · 3 km away
40. 2.02 km E of Cobb, CaliforniaSat, Dec 19, 10:41 AM PST · 14157 days ago · 3 km deep · 9 km away
41. 1.66 km W of Cobb, CaliforniaTue, Dec 22, 1:58 AM PST · 14154 days ago · 3 km deep · 1 km away
42. 2.6Northern CaliforniaTue, Dec 22, 12:52 PM PST · 14154 days ago · 1 km deep · 12 km away
43. 2.08 km WSW of Cobb, CaliforniaTue, Dec 22, 1:47 PM PST · 14154 days ago · 3 km deep · 4 km away
44. 1.85 km SW of Cobb, CaliforniaWed, Dec 23, 5:21 AM PST · 14153 days ago · -1 km deep · 6 km away
45. 1.55 km SSW of Cobb, CaliforniaThu, Dec 24, 12:15 AM PST · 14152 days ago · 0 km deep · 7 km away
46. 1.85 km WSW of Cobb, CaliforniaThu, Dec 24, 1:41 PM PST · 14152 days ago · 2 km deep · 3 km away
47. 1.67 km ENE of Larkfield-Wikiup, CaliforniaFri, Dec 25, 4:29 AM PST · 14151 days ago · 6 km deep · 35 km away
48. 1.68 km WSW of Cobb, CaliforniaFri, Dec 25, 7:27 AM PST · 14151 days ago · -1 km deep · 4 km away
49. 2.14 km WSW of Cobb, CaliforniaFri, Dec 25, 1:16 PM PST · 14151 days ago · -1 km deep · 4 km away
50. 1.75 km SSW of Cobb, CaliforniaFri, Dec 25, 2:36 PM PST · 14151 days ago · 1 km deep · 7 km away
51. 2.17 km WSW of Cobb, CaliforniaFri, Dec 25, 3:10 PM PST · 14151 days ago · -1 km deep · 4 km away
52. 1.89 km W of Cobb, CaliforniaSat, Dec 26, 7:00 AM PST · 14150 days ago · 0 km deep · 3 km away
53. 1.68 km W of Cobb, CaliforniaSat, Dec 26, 7:00 AM PST · 14150 days ago · 1 km deep · 2 km away
54. 1.75 km WSW of Cobb, CaliforniaSat, Dec 26, 3:30 PM PST · 14150 days ago · 0 km deep · 4 km away
55. 1.94 km W of Cobb, CaliforniaSun, Dec 27, 4:52 PM PST · 14148 days ago · 0 km deep · 2 km away
56. 1.77 km WSW of Cobb, CaliforniaMon, Dec 28, 12:35 AM PST · 14148 days ago · 1 km deep · 3 km away
57. 1.87 km WSW of Cobb, CaliforniaMon, Dec 28, 1:38 AM PST · 14148 days ago · 5 km deep · 4 km away
58. 1.57 km WSW of Cobb, CaliforniaMon, Dec 28, 4:25 AM PST · 14148 days ago · 2 km deep · 4 km away
59. 2.66 km W of Cobb, CaliforniaMon, Dec 28, 1:09 PM PST · 14148 days ago · 3 km deep · 1 km away
60. 2.112 km ESE of Angwin, CaliforniaMon, Dec 28, 1:15 PM PST · 14148 days ago · 3 km deep · 53 km away

The first 60 of 169.

From the USGS Earthquake Hazards Program and its partner networks, event nc109383. Read Tue, Sep 22, 2026, 12:16 PM UTC.