M2.1 earthquake 6 km WSW of Cobb, California

Magnitude

2.1 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Tue, Nov 4, 1986, 12:14 PM PST

UTC

1986-11-04 20:14:53 UTC

Depth

3.6 km (2.2 mi), shallow

Epicenter

38.805° N, 122.796° 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

±0.13

Depth from

From location

Station coverage gap

57°

Stations used

14

• Cobb, CaliforniaPopulation 1,778. Forecast7 kmWSW
• Healdsburg, CaliforniaPopulation 11,742. Forecast22 kmNNE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast41 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast667 kmNW

After

1. 1.97 km WSW of Cobb, CaliforniaTue, Nov 4, 7:01 PM PST · 14575 days ago · 1 km deep · 1 km away
2. 1.75 km WSW of Cobb, CaliforniaTue, Nov 4, 10:20 PM PST · 14575 days ago · 0 km deep · 2 km away
3. 1.79 km W of Cobb, CaliforniaWed, Nov 5, 1:19 AM PST · 14575 days ago · 1 km deep · 3 km away
4. 2.06 km NW of Green Valley, CaliforniaWed, Nov 5, 7:14 AM PST · 14575 days ago · 8 km deep · 76 km away
5. 2.110 km E of Hidden Valley Lake, CaliforniaWed, Nov 5, 3:00 PM PST · 14575 days ago · 2 km deep · 31 km away
6. 2.610 km NW of Cazadero, CaliforniaWed, Nov 5, 7:22 PM PST · 14574 days ago · 18 km deep · 41 km away
7. 1.62 km SSW of Angwin, CaliforniaWed, Nov 5, 8:23 PM PST · 14574 days ago · 13 km deep · 40 km away
8. 1.74 km SSW of Calistoga, CaliforniaThu, Nov 6, 2:27 AM PST · 14574 days ago · 4 km deep · 33 km away
9. 1.68 km SW of Hopland, CaliforniaThu, Nov 6, 10:21 AM PST · 14574 days ago · 4 km deep · 35 km away
10. 1.96 km WNW of Montalvin, CaliforniaThu, Nov 6, 3:32 PM PST · 14573 days ago · 31 km deep · 94 km away
11. 2.17 km W of Cobb, CaliforniaThu, Nov 6, 6:05 PM PST · 14573 days ago · 3 km deep · 2 km away
12. 2.310 km N of Cloverdale, CaliforniaFri, Nov 7, 5:56 AM PST · 14573 days ago · 22 km deep · 20 km away
13. 2.19 km W of Cobb, CaliforniaFri, Nov 7, 9:14 PM PST · 14572 days ago · -1 km deep · 3 km away
14. 1.66 km W of Cobb, CaliforniaFri, Nov 7, 9:15 PM PST · 14572 days ago · 2 km deep · 2 km away
15. 1.79 km WNW of Cazadero, CaliforniaSat, Nov 8, 7:38 PM PST · 14571 days ago · 4 km deep · 44 km away
16. 2.67 km W of Cobb, CaliforniaSun, Nov 9, 4:28 AM PST · 14571 days ago · 3 km deep · 2 km away
17. 1.94 km W of Cobb, CaliforniaSun, Nov 9, 1:28 PM PST · 14571 days ago · 0 km deep · 2 km away
18. 2.811 km S of Kelseyville, CaliforniaSun, Nov 9, 2:11 PM PST · 14571 days ago · 2 km deep · 9 km away
19. 2.46 km WSW of Cobb, CaliforniaSun, Nov 9, 5:05 PM PST · 14570 days ago · 1 km deep · 0 km away
20. 2.218 km W of Cloverdale, CaliforniaSun, Nov 9, 6:59 PM PST · 14570 days ago · 5 km deep · 38 km away
21. 1.75 km SW of Cobb, CaliforniaSun, Nov 9, 11:41 PM PST · 14570 days ago · 0 km deep · 3 km away
22. 2.85 km SW of Cobb, CaliforniaMon, Nov 10, 7:22 AM PST · 14570 days ago · 0 km deep · 2 km away
23. 3.75 km SW of Cobb, CaliforniaMon, Nov 10, 7:22 AM PST · 14570 days ago · 0 km deep · 2 km away
24. 1.85 km WSW of Cobb, CaliforniaMon, Nov 10, 7:24 AM PST · 14570 days ago · 0 km deep · 2 km away
25. 1.65 km WSW of Cobb, CaliforniaMon, Nov 10, 6:32 PM PST · 14569 days ago · 1 km deep · 2 km away
26. 1.610 km W of Ukiah, CaliforniaMon, Nov 10, 11:07 PM PST · 14569 days ago · 4 km deep · 59 km away
27. 1.54 km WNW of Cobb, CaliforniaTue, Nov 11, 12:04 AM PST · 14569 days ago · 2 km deep · 4 km away
28. 1.75 km WSW of Cobb, CaliforniaTue, Nov 11, 7:15 AM PST · 14569 days ago · 2 km deep · 2 km away
29. 1.95 km WSW of Cobb, CaliforniaTue, Nov 11, 2:30 PM PST · 14569 days ago · 4 km deep · 1 km away
30. 1.66 km W of Cobb, CaliforniaTue, Nov 11, 4:10 PM PST · 14568 days ago · 1 km deep · 3 km away
31. 2.16 km W of Cobb, CaliforniaTue, Nov 11, 4:19 PM PST · 14568 days ago · 2 km deep · 1 km away
32. 2.06 km W of Cobb, CaliforniaWed, Nov 12, 2:07 AM PST · 14568 days ago · 3 km deep · 2 km away
33. 2.53 km NNE of Guerneville, CaliforniaThu, Nov 13, 8:26 PM PST · 14566 days ago · 0 km deep · 34 km away
34. 3.010 km W of Cobb, CaliforniaFri, Nov 14, 1:24 PM PST · 14566 days ago · 0 km deep · 4 km away
35. 2.87 km W of Cobb, CaliforniaFri, Nov 14, 1:27 PM PST · 14566 days ago · 1 km deep · 3 km away
36. 1.52 km NE of Hidden Valley Lake, CaliforniaFri, Nov 14, 10:01 PM PST · 14565 days ago · 4 km deep · 23 km away
37. 2.57 km W of Cobb, CaliforniaSat, Nov 15, 7:09 PM PST · 14564 days ago · -1 km deep · 1 km away
38. 2.16 km SSW of Clear Lake Riviera, CaliforniaSun, Nov 16, 4:14 AM PST · 14564 days ago · 1 km deep · 11 km away
39. 1.99 km ESE of Hidden Valley Lake, CaliforniaMon, Nov 17, 11:04 AM PST · 14563 days ago · 6 km deep · 29 km away
40. 2.22 km NE of Green Valley, CaliforniaTue, Nov 18, 4:46 AM PST · 14562 days ago · 12 km deep · 82 km away
41. 3.06 km W of Cobb, CaliforniaTue, Nov 18, 11:01 AM PST · 14562 days ago · 4 km deep · 1 km away
42. 2.11 km SSW of Hopland, CaliforniaWed, Nov 19, 12:43 AM PST · 14561 days ago · 6 km deep · 33 km away
43. 2.04 km WNW of Cobb, CaliforniaWed, Nov 19, 7:50 AM PST · 14561 days ago · 2 km deep · 4 km away
44. 1.79 km WSW of Cobb, CaliforniaWed, Nov 19, 6:58 PM PST · 14560 days ago · 0 km deep · 3 km away
45. 1.85 km E of Hidden Valley Lake, CaliforniaWed, Nov 19, 8:52 PM PST · 14560 days ago · 11 km deep · 26 km away
46. 2.311 km ESE of Hidden Valley Lake, CaliforniaThu, Nov 20, 3:30 AM PST · 14560 days ago · 11 km deep · 32 km away
47. 2.08 km WSW of Cobb, CaliforniaThu, Nov 20, 5:02 PM PST · 14559 days ago · 3 km deep · 2 km away
48. 2.312 km WNW of Calistoga, CaliforniaFri, Nov 21, 12:08 AM PST · 14559 days ago · 6 km deep · 22 km away
49. 1.99 km WSW of Cobb, CaliforniaFri, Nov 21, 3:59 AM PST · 14559 days ago · 3 km deep · 2 km away
50. 2.712 km E of Hidden Valley Lake, CaliforniaFri, Nov 21, 6:27 PM PST · 14558 days ago · 13 km deep · 33 km away
51. 1.911 km ESE of Hidden Valley Lake, CaliforniaFri, Nov 21, 6:56 PM PST · 14558 days ago · 6 km deep · 31 km away
52. 1.922 km NNE of Upper Lake, CaliforniaSat, Nov 22, 11:18 AM PST · 14558 days ago · 0 km deep · 62 km away
53. 2.17 km WSW of Cobb, CaliforniaSun, Nov 23, 7:03 AM PST · 14557 days ago · 0 km deep · 1 km away
54. 2.46 km W of Cobb, CaliforniaSun, Nov 23, 7:06 AM PST · 14557 days ago · 2 km deep · 2 km away
55. 2.67 km WSW of Cobb, CaliforniaSun, Nov 23, 7:07 AM PST · 14557 days ago · 0 km deep · 1 km away
56. 2.38 km W of Cobb, CaliforniaSun, Nov 23, 11:48 PM PST · 14556 days ago · 4 km deep · 2 km away
57. 1.811 km E of Hidden Valley Lake, CaliforniaMon, Nov 24, 3:19 AM PST · 14556 days ago · 11 km deep · 32 km away
58. 2.39 km W of Cobb, CaliforniaMon, Nov 24, 1:01 PM PST · 14556 days ago · 0 km deep · 3 km away
59. 2.05 km W of Cobb, CaliforniaMon, Nov 24, 3:06 PM PST · 14556 days ago · 1 km deep · 3 km away
60. 1.510 km ESE of Hidden Valley Lake, CaliforniaTue, Nov 25, 1:17 AM PST · 14555 days ago · 7 km deep · 30 km away

The first 60 of 176.

Before

1. 2.121 km NE of Potter Valley, CaliforniaTue, Nov 4, 12:03 PM PST · 14576 days ago · 10 km deep · 75 km away
2. 1.68 km W of Cobb, CaliforniaTue, Nov 4, 12:33 AM PST · 14576 days ago · 1 km deep · 3 km away
3. 1.64 km WSW of Clear Lake Riviera, CaliforniaTue, Nov 4, 12:15 AM PST · 14576 days ago · 0 km deep · 15 km away
4. 2.06 km NW of Cobb, CaliforniaSun, Nov 2, 4:44 PM PST · 14577 days ago · -1 km deep · 7 km away
5. 1.74 km WSW of Cobb, CaliforniaSun, Nov 2, 11:36 AM PST · 14578 days ago · 0 km deep · 2 km away
6. 2.110 km NNW of Redwood Valley, CaliforniaSat, Nov 1, 7:29 PM PST · 14578 days ago · 4 km deep · 73 km away
7. 2.08 km NNE of Brooktrails, CaliforniaSat, Nov 1, 8:20 AM PST · 14579 days ago · 19 km deep · 93 km away
8. 1.64 km WSW of Cobb, CaliforniaSat, Nov 1, 2:50 AM PST · 14579 days ago · 2 km deep · 2 km away
9. 3.02 km SW of Cobb, CaliforniaSat, Nov 1, 12:40 AM PST · 14579 days ago · 2 km deep · 5 km away
10. 1.54 km WNW of Cobb, CaliforniaFri, Oct 31, 5:41 PM PST · 14579 days ago · -1 km deep · 5 km away
11. 1.67 km W of Cobb, CaliforniaFri, Oct 31, 7:00 AM PST · 14580 days ago · 6 km deep · 2 km away
12. 1.62 km WNW of Sea Ranch, CaliforniaThu, Oct 30, 6:42 AM PST · 14581 days ago · 3 km deep · 60 km away
13. 2.27 km WSW of Cobb, CaliforniaWed, Oct 29, 3:57 PM PST · 14581 days ago · 0 km deep · 1 km away
14. 1.718 km S of Covelo, CaliforniaWed, Oct 29, 8:40 AM PST · 14582 days ago · 4 km deep · 99 km away
15. 1.714 km E of Angwin, CaliforniaWed, Oct 29, 8:10 AM PST · 14582 days ago · 5 km deep · 50 km away
16. 3.15 km W of Cobb, CaliforniaTue, Oct 28, 1:29 PM PST · 14583 days ago · 1 km deep · 2 km away
17. 2.07 km ENE of Clearlake, CaliforniaMon, Oct 27, 10:08 AM PST · 14584 days ago · 13 km deep · 30 km away
18. 1.65 km WSW of Cobb, CaliforniaSun, Oct 26, 1:40 AM PDT · 14585 days ago · 0 km deep · 1 km away
19. 1.67 km WSW of Cobb, CaliforniaSat, Oct 25, 3:17 AM PDT · 14586 days ago · 2 km deep · 0 km away
20. 1.97 km WSW of Cobb, CaliforniaSat, Oct 25, 3:07 AM PDT · 14586 days ago · 1 km deep · 1 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc87251. Read Thu, Oct 1, 2026, 10:46 AM UTC.