M2.0 earthquake 6 km W of Cobb, California

Magnitude

2.0 (md), micro

Local time

Tue, Sep 29, 1987, 6:59 PM PDT

UTC

1987-09-30 01:59:10 UTC

Depth

3.4 km (2.1 mi), shallow

Epicenter

38.820° N, 122.795° 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

±0.08

Depth from

From location

Station coverage gap

107°

Stations used

17

• 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. 1.710 km W of Cobb, CaliforniaTue, Sep 29, 8:26 PM PDT · 14242 days ago · 1 km deep · 5 km away
2. 1.57 km W of Cobb, CaliforniaThu, Oct 1, 12:32 AM PDT · 14241 days ago · 3 km deep · 2 km away
3. 1.86 km WSW of Cobb, CaliforniaThu, Oct 1, 11:17 AM PDT · 14240 days ago · 4 km deep · 1 km away
4. 1.96 km S of Clear Lake Riviera, CaliforniaThu, Oct 1, 4:13 PM PDT · 14240 days ago · -1 km deep · 10 km away
5. 2.19 km W of Cobb, CaliforniaThu, Oct 1, 4:51 PM PDT · 14240 days ago · 0 km deep · 3 km away
6. 1.75 km WSW of Cobb, CaliforniaFri, Oct 2, 3:04 AM PDT · 14240 days ago · -1 km deep · 3 km away
7. 1.54 km SW of Kenwood, CaliforniaFri, Oct 2, 12:47 PM PDT · 14239 days ago · 2 km deep · 51 km away
8. 1.85 km W of Cobb, CaliforniaSat, Oct 3, 6:14 AM PDT · 14239 days ago · 1 km deep · 1 km away
9. 1.77 km W of Cobb, CaliforniaSat, Oct 3, 7:59 AM PDT · 14238 days ago · 0 km deep · 1 km away
10. 2.112 km NE of Philo, CaliforniaSat, Oct 3, 1:19 PM PDT · 14238 days ago · -1 km deep · 61 km away
11. 1.57 km W of Cobb, CaliforniaSun, Oct 4, 2:15 AM PDT · 14238 days ago · 3 km deep · 1 km away
12. 1.74 km WSW of Cobb, CaliforniaSun, Oct 4, 8:50 AM PDT · 14237 days ago · 2 km deep · 3 km away
13. 1.57 km W of Cobb, CaliforniaSun, Oct 4, 7:17 PM PDT · 14237 days ago · 0 km deep · 2 km away
14. 1.7Northern CaliforniaMon, Oct 5, 6:07 AM PDT · 14237 days ago · 2 km deep · 51 km away
15. 1.56 km WNW of Cobb, CaliforniaMon, Oct 5, 3:23 PM PDT · 14236 days ago · 0 km deep · 2 km away
16. 1.71 km ENE of American Canyon, CaliforniaTue, Oct 6, 6:18 AM PDT · 14236 days ago · 9 km deep · 86 km away
17. 3.16 km W of Cobb, CaliforniaTue, Oct 6, 9:30 AM PDT · 14235 days ago · 3 km deep · 0 km away
18. 1.611 km WNW of Calistoga, CaliforniaTue, Oct 6, 3:26 PM PDT · 14235 days ago · 7 km deep · 24 km away
19. 1.72 km NNW of Clear Lake Riviera, CaliforniaTue, Oct 6, 9:32 PM PDT · 14235 days ago · 8 km deep · 18 km away
20. 2.04 km SW of Hopland, CaliforniaFri, Oct 9, 1:24 AM PDT · 14233 days ago · 4 km deep · 34 km away
21. 3.16 km W of Cobb, CaliforniaFri, Oct 9, 2:05 AM PDT · 14233 days ago · 4 km deep · 0 km away
22. 1.86 km W of Cobb, CaliforniaFri, Oct 9, 2:07 AM PDT · 14233 days ago · 3 km deep · 0 km away
23. 1.54 km WSW of Cobb, CaliforniaFri, Oct 9, 9:01 AM PDT · 14232 days ago · 1 km deep · 2 km away
24. 1.56 km W of Cobb, CaliforniaFri, Oct 9, 5:49 PM PDT · 14232 days ago · 3 km deep · 0 km away
25. 2.16 km SW of Cobb, CaliforniaSat, Oct 10, 4:18 AM PDT · 14232 days ago · 1 km deep · 4 km away
26. 1.67 km W of Cobb, CaliforniaSat, Oct 10, 5:18 AM PDT · 14232 days ago · 1 km deep · 2 km away
27. 1.85 km WSW of Cobb, CaliforniaSat, Oct 10, 7:36 AM PDT · 14231 days ago · 0 km deep · 3 km away
28. 1.94 km NW of Philo, CaliforniaSat, Oct 10, 2:33 PM PDT · 14231 days ago · -1 km deep · 67 km away
29. 1.59 km WSW of Cobb, CaliforniaSat, Oct 10, 6:43 PM PDT · 14231 days ago · 1 km deep · 3 km away
30. 2.3Northern CaliforniaSun, Oct 11, 3:42 AM PDT · 14231 days ago · 1 km deep · 4 km away
31. 2.37 km NNE of Hopland, CaliforniaSun, Oct 11, 7:08 AM PDT · 14230 days ago · 1 km deep · 33 km away
32. 1.96 km W of Cobb, CaliforniaSun, Oct 11, 8:37 AM PDT · 14230 days ago · 3 km deep · 0 km away
33. 1.66 km W of Cobb, CaliforniaMon, Oct 12, 12:36 AM PDT · 14230 days ago · 3 km deep · 1 km away
34. 1.85 km W of Cobb, CaliforniaMon, Oct 12, 12:38 AM PDT · 14230 days ago · 2 km deep · 0 km away
35. 2.55 km W of Cobb, CaliforniaMon, Oct 12, 12:40 AM PDT · 14230 days ago · 2 km deep · 1 km away
36. 1.68 km W of Cobb, CaliforniaMon, Oct 12, 6:37 AM PDT · 14229 days ago · 3 km deep · 2 km away
37. 1.66 km SW of Cobb, CaliforniaMon, Oct 12, 4:05 PM PDT · 14229 days ago · 0 km deep · 5 km away
38. 2.24 km S of Cobb, CaliforniaMon, Oct 12, 4:41 PM PDT · 14229 days ago · 2 km deep · 8 km away
39. 2.28 km WSW of Cobb, CaliforniaMon, Oct 12, 9:55 PM PDT · 14229 days ago · 0 km deep · 3 km away
40. 1.54 km W of Cobb, CaliforniaTue, Oct 13, 4:13 PM PDT · 14228 days ago · -1 km deep · 2 km away
41. 1.913 km SSW of Willits, CaliforniaTue, Oct 13, 10:45 PM PDT · 14228 days ago · 3 km deep · 78 km away
42. 2.04 km SSE of Napa, CaliforniaWed, Oct 14, 10:35 AM PDT · 14227 days ago · 12 km deep · 77 km away
43. 1.66 km WSW of Cobb, CaliforniaWed, Oct 14, 8:55 PM PDT · 14227 days ago · -1 km deep · 2 km away
44. 2.64 km WSW of Cobb, CaliforniaWed, Oct 14, 10:09 PM PDT · 14227 days ago · 2 km deep · 3 km away
45. 1.74 km WSW of Cobb, CaliforniaWed, Oct 14, 10:10 PM PDT · 14227 days ago · 1 km deep · 3 km away
46. 1.64 km WSW of Cobb, CaliforniaWed, Oct 14, 10:17 PM PDT · 14227 days ago · 1 km deep · 3 km away
47. 1.716 km N of Upper Lake, CaliforniaThu, Oct 15, 3:50 AM PDT · 14227 days ago · 7 km deep · 55 km away
48. 1.66 km SW of Cobb, CaliforniaThu, Oct 15, 8:07 AM PDT · 14226 days ago · 0 km deep · 5 km away
49. 2.18 km WSW of Cobb, CaliforniaThu, Oct 15, 4:48 PM PDT · 14226 days ago · 0 km deep · 3 km away
50. 2.510 km E of Cloverdale, CaliforniaThu, Oct 15, 8:10 PM PDT · 14226 days ago · 5 km deep · 9 km away
51. 1.55 km SSW of Cobb, CaliforniaFri, Oct 16, 10:18 AM PDT · 14225 days ago · 1 km deep · 6 km away
52. 1.86 km W of Cobb, CaliforniaFri, Oct 16, 2:06 PM PDT · 14225 days ago · 3 km deep · 0 km away
53. 1.64 km W of Cobb, CaliforniaSat, Oct 17, 1:42 AM PDT · 14225 days ago · 0 km deep · 2 km away
54. 2.427 km NNE of Potter Valley, CaliforniaSat, Oct 17, 3:50 AM PDT · 14225 days ago · 10 km deep · 80 km away
55. 1.76 km WSW of Cobb, CaliforniaSat, Oct 17, 2:35 PM PDT · 14224 days ago · 3 km deep · 2 km away
56. 1.65 km SW of Cobb, CaliforniaSat, Oct 17, 10:39 PM PDT · 14224 days ago · -1 km deep · 5 km away
57. 2.27 km WSW of Cobb, CaliforniaSun, Oct 18, 3:25 AM PDT · 14224 days ago · 3 km deep · 2 km away
58. 1.56 km WNW of Cobb, CaliforniaSun, Oct 18, 4:11 AM PDT · 14224 days ago · -1 km deep · 2 km away
59. 1.79 km WSW of Cobb, CaliforniaSun, Oct 18, 7:58 AM PDT · 14223 days ago · 2 km deep · 3 km away
60. 1.74 km WSW of Cobb, CaliforniaSun, Oct 18, 4:33 PM PDT · 14223 days ago · -1 km deep · 2 km away

The first 60 of 159.

Before

1. 2.011 km W of Cobb, CaliforniaTue, Sep 29, 9:11 AM PDT · 14242 days ago · 2 km deep · 5 km away
2. 1.64 km N of Clear Lake Riviera, CaliforniaTue, Sep 29, 5:18 AM PDT · 14243 days ago · 1 km deep · 21 km away
3. 3.25 km SW of Cobb, CaliforniaTue, Sep 29, 12:04 AM PDT · 14243 days ago · 0 km deep · 3 km away
4. 3.05 km SW of Cobb, CaliforniaTue, Sep 29, 12:04 AM PDT · 14243 days ago · 0 km deep · 4 km away
5. 1.54 km WSW of Cobb, CaliforniaSun, Sep 27, 6:39 AM PDT · 14244 days ago · 0 km deep · 3 km away
6. 2.62 km ESE of Mendocino, CaliforniaSun, Sep 27, 1:26 AM PDT · 14245 days ago · 26 km deep · 99 km away
7. 1.86 km WSW of Cobb, CaliforniaSun, Sep 27, 12:18 AM PDT · 14245 days ago · 0 km deep · 2 km away
8. 1.77 km WSW of Cobb, CaliforniaSat, Sep 26, 9:50 AM PDT · 14245 days ago · 1 km deep · 3 km away
9. 2.97 km WSW of Cobb, CaliforniaSat, Sep 26, 7:55 AM PDT · 14245 days ago · 1 km deep · 2 km away
10. 2.55 km W of Cobb, CaliforniaFri, Sep 25, 7:39 PM PDT · 14246 days ago · 3 km deep · 0 km away
11. 2.25 km SSW of Cobb, CaliforniaFri, Sep 25, 5:39 PM PDT · 14246 days ago · 12 km deep · 6 km away
12. 1.65 km WSW of Cobb, CaliforniaFri, Sep 25, 2:34 PM PDT · 14246 days ago · 0 km deep · 2 km away
13. 1.76 km SW of Cobb, CaliforniaThu, Sep 24, 4:09 PM PDT · 14247 days ago · 0 km deep · 4 km away
14. 1.86 km WSW of Cobb, CaliforniaThu, Sep 24, 10:47 AM PDT · 14247 days ago · 0 km deep · 1 km away
15. 3.05 km SW of Cobb, CaliforniaThu, Sep 24, 5:50 AM PDT · 14248 days ago · 0 km deep · 5 km away
16. 2.15 km SW of Cobb, CaliforniaThu, Sep 24, 5:49 AM PDT · 14248 days ago · 0 km deep · 5 km away
17. 1.711 km W of Cobb, CaliforniaThu, Sep 24, 5:12 AM PDT · 14248 days ago · 4 km deep · 5 km away
18. 1.78 km W of Cobb, CaliforniaWed, Sep 23, 10:54 PM PDT · 14248 days ago · 1 km deep · 2 km away
19. 2.77 km WSW of Cobb, CaliforniaWed, Sep 23, 1:25 AM PDT · 14249 days ago · 3 km deep · 2 km away
20. 2.06 km WSW of Cobb, CaliforniaTue, Sep 22, 8:15 PM PDT · 14249 days ago · 1 km deep · 1 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc106513. Read Sun, Sep 27, 2026, 1:03 AM UTC.