M1.9 earthquake 5 km W of Cobb, California

Magnitude

1.9 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Wed, Aug 5, 1987, 3:03 AM PDT

UTC

1987-08-05 10:03:00 UTC

Depth

1.4 km (0.9 mi), shallow

Epicenter

38.826° N, 122.791° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.4 km in depth

Magnitude uncertainty

±0.16

Depth from

From location

Station coverage gap

62°

Stations used

15

• Cobb, CaliforniaPopulation 1,778. Forecast6 kmW
• Clearlake, CaliforniaPopulation 15,182. Forecast20 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast43 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast668 kmNW

After

1. 2.14 km WSW of Cobb, CaliforniaThu, Aug 6, 12:53 AM PDT · 14302 days ago · 1 km deep · 3 km away
2. 1.64 km WSW of Cobb, CaliforniaThu, Aug 6, 8:28 AM PDT · 14301 days ago · 1 km deep · 3 km away
3. 1.64 km WSW of Cobb, CaliforniaThu, Aug 6, 8:29 AM PDT · 14301 days ago · 1 km deep · 3 km away
4. 1.75 km WSW of Cobb, CaliforniaThu, Aug 6, 6:29 PM PDT · 14301 days ago · 1 km deep · 2 km away
5. 1.59 km W of Cobb, CaliforniaThu, Aug 6, 7:40 PM PDT · 14301 days ago · 1 km deep · 4 km away
6. 2.35 km WSW of Cobb, CaliforniaThu, Aug 6, 9:26 PM PDT · 14301 days ago · 0 km deep · 3 km away
7. 2.05 km WSW of Cobb, CaliforniaFri, Aug 7, 6:51 AM PDT · 14301 days ago · -1 km deep · 2 km away
8. 1.66 km W of Cobb, CaliforniaSat, Aug 8, 5:46 PM PDT · 14299 days ago · 3 km deep · 1 km away
9. 1.86 km WSW of Cobb, CaliforniaSun, Aug 9, 6:18 AM PDT · 14299 days ago · 3 km deep · 2 km away
10. 1.78 km W of Cobb, CaliforniaSun, Aug 9, 6:14 PM PDT · 14298 days ago · 1 km deep · 3 km away
11. 1.65 km W of Cobb, CaliforniaMon, Aug 10, 4:13 AM PDT · 14298 days ago · 0 km deep · 0 km away
12. 1.65 km W of Cobb, CaliforniaMon, Aug 10, 7:03 AM PDT · 14298 days ago · 0 km deep · 0 km away
13. 1.64 km WSW of Cobb, CaliforniaMon, Aug 10, 10:01 AM PDT · 14297 days ago · 1 km deep · 3 km away
14. 1.66 km W of Cobb, CaliforniaMon, Aug 10, 12:45 PM PDT · 14297 days ago · 3 km deep · 1 km away
15. 1.86 km SW of Cobb, CaliforniaMon, Aug 10, 7:28 PM PDT · 14297 days ago · 1 km deep · 5 km away
16. 1.86 km SW of Cobb, CaliforniaMon, Aug 10, 9:42 PM PDT · 14297 days ago · 1 km deep · 5 km away
17. 1.75 km W of Cobb, CaliforniaMon, Aug 10, 10:10 PM PDT · 14297 days ago · -1 km deep · 1 km away
18. 1.67 km W of Cobb, CaliforniaTue, Aug 11, 12:16 PM PDT · 14296 days ago · 1 km deep · 2 km away
19. 1.86 km SW of Cobb, CaliforniaWed, Aug 12, 1:57 AM PDT · 14296 days ago · 0 km deep · 5 km away
20. 2.010 km SE of Willits, CaliforniaWed, Aug 12, 6:47 AM PDT · 14296 days ago · 0 km deep · 71 km away
21. 1.86 km WSW of Cobb, CaliforniaWed, Aug 12, 10:48 AM PDT · 14295 days ago · 0 km deep · 2 km away
22. 1.86 km WSW of Cobb, CaliforniaWed, Aug 12, 10:59 AM PDT · 14295 days ago · 1 km deep · 2 km away
23. 1.66 km W of Cobb, CaliforniaWed, Aug 12, 4:34 PM PDT · 14295 days ago · 2 km deep · 0 km away
24. 1.83 km N of Cloverdale, CaliforniaWed, Aug 12, 5:48 PM PDT · 14295 days ago · 0 km deep · 20 km away
25. 1.66 km SW of Cobb, CaliforniaWed, Aug 12, 6:47 PM PDT · 14295 days ago · 0 km deep · 5 km away
26. 1.57 km WSW of Cobb, CaliforniaThu, Aug 13, 6:23 AM PDT · 14295 days ago · 3 km deep · 4 km away
27. 1.87 km WSW of Cobb, CaliforniaThu, Aug 13, 12:03 PM PDT · 14294 days ago · 1 km deep · 3 km away
28. 1.79 km SE of Boonville, CaliforniaThu, Aug 13, 12:05 PM PDT · 14294 days ago · 7 km deep · 44 km away
29. 1.56 km W of Cobb, CaliforniaThu, Aug 13, 5:25 PM PDT · 14294 days ago · 2 km deep · 2 km away
30. 1.55 km WNW of Cobb, CaliforniaThu, Aug 13, 10:16 PM PDT · 14294 days ago · 1 km deep · 1 km away
31. 1.74 km W of Cobb, CaliforniaFri, Aug 14, 9:28 AM PDT · 14293 days ago · 1 km deep · 2 km away
32. 2.27 km W of Cobb, CaliforniaFri, Aug 14, 12:09 PM PDT · 14293 days ago · 4 km deep · 2 km away
33. 1.84 km SW of Cobb, CaliforniaFri, Aug 14, 5:35 PM PDT · 14293 days ago · 0 km deep · 4 km away
34. 1.87 km W of Cobb, CaliforniaFri, Aug 14, 7:48 PM PDT · 14293 days ago · 1 km deep · 2 km away
35. 1.87 km WSW of Cobb, CaliforniaSat, Aug 15, 4:55 AM PDT · 14293 days ago · 2 km deep · 3 km away
36. 1.97 km WSW of Cobb, CaliforniaSat, Aug 15, 7:58 PM PDT · 14292 days ago · 1 km deep · 3 km away
37. 1.72 km SSW of Clearlake, CaliforniaSun, Aug 16, 6:37 AM PDT · 14292 days ago · 3 km deep · 18 km away
38. 1.8Northern CaliforniaSun, Aug 16, 12:20 PM PDT · 14291 days ago · 1 km deep · 4 km away
39. 1.59 km ESE of Hidden Valley Lake, CaliforniaSun, Aug 16, 1:02 PM PDT · 14291 days ago · 5 km deep · 30 km away
40. 1.91 km W of Green Valley, CaliforniaSun, Aug 16, 3:59 PM PDT · 14291 days ago · 10 km deep · 83 km away
41. 2.15 km SW of Cobb, CaliforniaMon, Aug 17, 2:46 AM PDT · 14291 days ago · 2 km deep · 5 km away
42. 2.06 km W of Cobb, CaliforniaMon, Aug 17, 6:38 AM PDT · 14291 days ago · 4 km deep · 1 km away
43. 1.65 km W of Cobb, CaliforniaMon, Aug 17, 6:58 AM PDT · 14291 days ago · 1 km deep · 1 km away
44. 1.63 km NNW of Cloverdale, CaliforniaMon, Aug 17, 6:05 PM PDT · 14290 days ago · -1 km deep · 21 km away
45. 1.75 km WSW of Cobb, CaliforniaMon, Aug 17, 11:11 PM PDT · 14290 days ago · 0 km deep · 3 km away
46. 1.811 km SSW of Cloverdale, CaliforniaTue, Aug 18, 5:46 AM PDT · 14290 days ago · 4 km deep · 28 km away
47. 1.64 km SW of Cobb, CaliforniaTue, Aug 18, 11:26 AM PDT · 14289 days ago · 0 km deep · 5 km away
48. 2.58 km W of Cobb, CaliforniaWed, Aug 19, 2:45 AM PDT · 14289 days ago · 0 km deep · 3 km away
49. 2.110 km ENE of Lucerne, CaliforniaWed, Aug 19, 3:19 AM PDT · 14289 days ago · 24 km deep · 36 km away
50. 2.67 km W of Cobb, CaliforniaWed, Aug 19, 6:13 AM PDT · 14289 days ago · 3 km deep · 2 km away
51. 2.16 km W of Cobb, CaliforniaWed, Aug 19, 7:13 PM PDT · 14288 days ago · 3 km deep · 1 km away
52. 1.63 km NNW of Cloverdale, CaliforniaThu, Aug 20, 5:52 PM PDT · 14287 days ago · 2 km deep · 21 km away
53. 1.96 km W of Cobb, CaliforniaThu, Aug 20, 9:50 PM PDT · 14287 days ago · -1 km deep · 1 km away
54. 1.86 km W of Cobb, CaliforniaThu, Aug 20, 9:59 PM PDT · 14287 days ago · 0 km deep · 1 km away
55. 1.96 km W of Cobb, CaliforniaThu, Aug 20, 9:59 PM PDT · 14287 days ago · 0 km deep · 0 km away
56. 1.66 km W of Cobb, CaliforniaFri, Aug 21, 1:55 AM PDT · 14287 days ago · 1 km deep · 1 km away
57. 1.75 km W of Cobb, CaliforniaFri, Aug 21, 2:31 AM PDT · 14287 days ago · 0 km deep · 1 km away
58. 1.86 km W of Cobb, CaliforniaSat, Aug 22, 7:13 AM PDT · 14286 days ago · 3 km deep · 1 km away
59. 2.16 km W of Cobb, CaliforniaSat, Aug 22, 7:33 AM PDT · 14286 days ago · 3 km deep · 1 km away
60. 1.65 km WNW of Cobb, CaliforniaSat, Aug 22, 10:58 AM PDT · 14285 days ago · 1 km deep · 1 km away

The first 60 of 169.

Before

1. 1.76 km WSW of Cobb, CaliforniaTue, Aug 4, 2:03 AM PDT · 14304 days ago · -1 km deep · 3 km away
2. 2.05 km WSW of Cobb, CaliforniaMon, Aug 3, 11:46 AM PDT · 14304 days ago · 1 km deep · 3 km away
3. 2.06 km WSW of Cobb, CaliforniaMon, Aug 3, 7:08 AM PDT · 14305 days ago · 3 km deep · 2 km away
4. 1.73 km W of Cobb, CaliforniaMon, Aug 3, 5:09 AM PDT · 14305 days ago · 0 km deep · 2 km away
5. 2.05 km W of Cobb, CaliforniaSun, Aug 2, 7:13 PM PDT · 14305 days ago · 1 km deep · 1 km away
6. 1.85 km WNW of Cobb, CaliforniaSun, Aug 2, 7:09 PM PDT · 14305 days ago · 3 km deep · 2 km away
7. 1.66 km SW of Glen Ellen, CaliforniaSun, Aug 2, 8:49 AM PDT · 14305 days ago · 8 km deep · 58 km away
8. 2.46 km W of Cobb, CaliforniaSun, Aug 2, 7:13 AM PDT · 14306 days ago · 3 km deep · 1 km away
9. 1.86 km W of Cobb, CaliforniaSun, Aug 2, 6:21 AM PDT · 14306 days ago · 3 km deep · 1 km away
10. 1.94 km SW of Cobb, CaliforniaSat, Aug 1, 6:09 PM PDT · 14306 days ago · 1 km deep · 4 km away
11. 1.67 km W of Cobb, CaliforniaSat, Aug 1, 1:37 PM PDT · 14306 days ago · 1 km deep · 2 km away
12. 1.76 km W of Cobb, CaliforniaSat, Aug 1, 4:49 AM PDT · 14307 days ago · 3 km deep · 1 km away
13. 1.95 km NW of Green Valley, CaliforniaSat, Aug 1, 2:02 AM PDT · 14307 days ago · 4 km deep · 78 km away
14. 1.64 km W of Cobb, CaliforniaFri, Jul 31, 1:15 PM PDT · 14307 days ago · 0 km deep · 1 km away
15. 1.68 km W of Cobb, CaliforniaFri, Jul 31, 8:26 AM PDT · 14307 days ago · 0 km deep · 3 km away
16. 2.75 km SSW of Cobb, CaliforniaThu, Jul 30, 11:19 PM PDT · 14308 days ago · 0 km deep · 6 km away
17. 2.55 km SSW of Cobb, CaliforniaThu, Jul 30, 11:16 PM PDT · 14308 days ago · 0 km deep · 6 km away
18. 2.08 km W of Cobb, CaliforniaThu, Jul 30, 6:13 PM PDT · 14308 days ago · 1 km deep · 3 km away
19. 1.67 km WSW of Cobb, CaliforniaThu, Jul 30, 4:30 PM PDT · 14308 days ago · 4 km deep · 4 km away
20. 1.66 km W of Cobb, CaliforniaThu, Jul 30, 4:25 PM PDT · 14308 days ago · 3 km deep · 1 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc104087. Read Fri, Oct 2, 2026, 2:03 AM UTC.