M1.5 earthquake 8 km W of Cobb, California

Magnitude

1.5 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Sun, Dec 7, 1986, 5:08 PM PST

UTC

1986-12-08 01:08:07 UTC

Depth

1.0 km (0.6 mi), shallow

Epicenter

38.823° N, 122.816° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 0.7 km in depth

Magnitude uncertainty

±0.07

Depth from

From location

Station coverage gap

69°

Stations used

11

• Cobb, CaliforniaPopulation 1,778. Forecast8 kmW
• Clearlake, CaliforniaPopulation 15,182. Forecast22 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast43 kmNNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast670 kmNW

After

1. 2.26 km N of Green Valley, CaliforniaMon, Dec 8, 1:29 AM PST · 14545 days ago · 10 km deep · 80 km away
2. 1.66 km SW of Cobb, CaliforniaMon, Dec 8, 4:12 PM PST · 14544 days ago · -1 km deep · 6 km away
3. 1.79 km W of Cobb, CaliforniaMon, Dec 8, 9:28 PM PST · 14544 days ago · 1 km deep · 1 km away
4. 1.87 km N of Green Valley, CaliforniaTue, Dec 9, 8:08 AM PST · 14544 days ago · 10 km deep · 79 km away
5. 2.26 km W of Cobb, CaliforniaTue, Dec 9, 6:58 PM PST · 14543 days ago · 1 km deep · 2 km away
6. 1.64 km WSW of Cobb, CaliforniaWed, Dec 10, 3:01 AM PST · 14543 days ago · 1 km deep · 5 km away
7. 1.66 km W of Cobb, CaliforniaWed, Dec 10, 6:05 PM PST · 14542 days ago · 1 km deep · 2 km away
8. 1.617 km ENE of Potter Valley, CaliforniaWed, Dec 10, 6:37 PM PST · 14542 days ago · 10 km deep · 63 km away
9. 1.86 km S of Cobb, CaliforniaThu, Dec 11, 12:29 AM PST · 14542 days ago · -1 km deep · 10 km away
10. 1.64 km WSW of Cobb, CaliforniaThu, Dec 11, 7:56 AM PST · 14542 days ago · 1 km deep · 5 km away
11. 1.65 km E of Healdsburg, CaliforniaThu, Dec 11, 6:45 PM PST · 14541 days ago · 2 km deep · 25 km away
12. 1.920 km ENE of Potter Valley, CaliforniaFri, Dec 12, 2:52 AM PST · 14541 days ago · -1 km deep · 62 km away
13. 3.3Northern CaliforniaFri, Dec 12, 5:47 PM PST · 14540 days ago · 10 km deep · 80 km away
14. 1.54 km SW of Cobb, CaliforniaSat, Dec 13, 12:14 AM PST · 14540 days ago · 3 km deep · 5 km away
15. 1.78 km ESE of Hidden Valley Lake, CaliforniaSat, Dec 13, 3:08 PM PST · 14539 days ago · 8 km deep · 31 km away
16. 1.79 km ESE of Hidden Valley Lake, CaliforniaSun, Dec 14, 7:42 AM PST · 14539 days ago · 8 km deep · 32 km away
17. 1.810 km ESE of Hidden Valley Lake, CaliforniaSun, Dec 14, 8:00 AM PST · 14539 days ago · 9 km deep · 32 km away
18. 1.85 km SSW of Cobb, CaliforniaSun, Dec 14, 9:47 AM PST · 14539 days ago · 1 km deep · 8 km away
19. 2.79 km E of Hidden Valley Lake, CaliforniaSun, Dec 14, 2:43 PM PST · 14538 days ago · 11 km deep · 31 km away
20. 3.38 km E of Hidden Valley Lake, CaliforniaSun, Dec 14, 2:58 PM PST · 14538 days ago · 9 km deep · 31 km away
21. 3.38 km E of Hidden Valley Lake, CaliforniaSun, Dec 14, 3:00 PM PST · 14538 days ago · 9 km deep · 31 km away
22. 2.98 km E of Hidden Valley Lake, CaliforniaSun, Dec 14, 3:01 PM PST · 14538 days ago · 7 km deep · 31 km away
23. 2.58 km ESE of Hidden Valley Lake, CaliforniaSun, Dec 14, 3:11 PM PST · 14538 days ago · 7 km deep · 31 km away
24. 1.99 km ESE of Hidden Valley Lake, CaliforniaSun, Dec 14, 3:11 PM PST · 14538 days ago · 7 km deep · 31 km away
25. 1.89 km ESE of Hidden Valley Lake, CaliforniaSun, Dec 14, 3:28 PM PST · 14538 days ago · 7 km deep · 32 km away
26. 1.57 km E of Hidden Valley Lake, CaliforniaSun, Dec 14, 3:58 PM PST · 14538 days ago · 8 km deep · 30 km away
27. 2.29 km ESE of Hidden Valley Lake, CaliforniaSun, Dec 14, 4:05 PM PST · 14538 days ago · 8 km deep · 32 km away
28. 1.78 km E of Hidden Valley Lake, CaliforniaSun, Dec 14, 4:40 PM PST · 14538 days ago · 8 km deep · 30 km away
29. 1.58 km E of Hidden Valley Lake, CaliforniaSun, Dec 14, 5:03 PM PST · 14538 days ago · 7 km deep · 31 km away
30. 2.98 km E of Hidden Valley Lake, CaliforniaSun, Dec 14, 5:08 PM PST · 14538 days ago · 9 km deep · 31 km away
31. 1.88 km ESE of Hidden Valley Lake, CaliforniaSun, Dec 14, 6:36 PM PST · 14538 days ago · 7 km deep · 30 km away
32. 1.88 km ESE of Hidden Valley Lake, CaliforniaSun, Dec 14, 6:39 PM PST · 14538 days ago · 7 km deep · 31 km away
33. 1.88 km E of Hidden Valley Lake, CaliforniaSun, Dec 14, 8:07 PM PST · 14538 days ago · 6 km deep · 31 km away
34. 2.67 km E of Hidden Valley Lake, CaliforniaSun, Dec 14, 11:37 PM PST · 14538 days ago · 7 km deep · 30 km away
35. 2.18 km E of Hidden Valley Lake, CaliforniaSun, Dec 14, 11:39 PM PST · 14538 days ago · 10 km deep · 31 km away
36. 2.16 km W of Cobb, CaliforniaSun, Dec 14, 11:59 PM PST · 14538 days ago · -1 km deep · 2 km away
37. 1.67 km W of Cobb, CaliforniaMon, Dec 15, 1:55 AM PST · 14538 days ago · 3 km deep · 1 km away
38. 1.68 km ESE of Hidden Valley Lake, CaliforniaMon, Dec 15, 4:28 AM PST · 14538 days ago · 7 km deep · 31 km away
39. 1.68 km W of Cobb, CaliforniaMon, Dec 15, 12:02 PM PST · 14537 days ago · -1 km deep · 1 km away
40. 1.89 km ESE of Hidden Valley Lake, CaliforniaMon, Dec 15, 2:28 PM PST · 14537 days ago · 7 km deep · 31 km away
41. 2.04 km SW of Cobb, CaliforniaMon, Dec 15, 3:14 PM PST · 14537 days ago · 1 km deep · 7 km away
42. 2.09 km ESE of Hidden Valley Lake, CaliforniaMon, Dec 15, 4:07 PM PST · 14537 days ago · 7 km deep · 31 km away
43. 1.88 km ESE of Hidden Valley Lake, CaliforniaTue, Dec 16, 1:31 AM PST · 14537 days ago · 7 km deep · 31 km away
44. 2.88 km E of Hidden Valley Lake, CaliforniaTue, Dec 16, 1:46 AM PST · 14537 days ago · 11 km deep · 31 km away
45. 1.810 km NNE of Angwin, CaliforniaTue, Dec 16, 2:15 AM PST · 14537 days ago · 2 km deep · 40 km away
46. 1.62 km E of Larkfield-Wikiup, CaliforniaTue, Dec 16, 2:26 AM PST · 14537 days ago · 8 km deep · 36 km away
47. 3.09 km ESE of Hidden Valley Lake, CaliforniaTue, Dec 16, 3:26 AM PST · 14537 days ago · 8 km deep · 32 km away
48. 2.77 km W of Cobb, CaliforniaTue, Dec 16, 4:14 AM PST · 14537 days ago · 1 km deep · 1 km away
49. 2.57 km WSW of Cobb, CaliforniaTue, Dec 16, 4:16 AM PST · 14537 days ago · 1 km deep · 2 km away
50. 2.57 km E of Hidden Valley Lake, CaliforniaTue, Dec 16, 10:11 AM PST · 14537 days ago · 9 km deep · 30 km away
51. 1.78 km ESE of Hidden Valley Lake, CaliforniaTue, Dec 16, 5:44 PM PST · 14536 days ago · 7 km deep · 31 km away
52. 1.88 km ESE of Hidden Valley Lake, CaliforniaTue, Dec 16, 6:01 PM PST · 14536 days ago · 7 km deep · 31 km away
53. 1.718 km ENE of Potter Valley, CaliforniaTue, Dec 16, 11:54 PM PST · 14536 days ago · 5 km deep · 60 km away
54. 2.76 km SW of Cobb, CaliforniaWed, Dec 17, 12:56 PM PST · 14535 days ago · 0 km deep · 6 km away
55. 1.77 km E of Geyserville, CaliforniaWed, Dec 17, 4:06 PM PST · 14535 days ago · 2 km deep · 14 km away
56. 1.98 km ESE of Hidden Valley Lake, CaliforniaThu, Dec 18, 2:25 AM PST · 14535 days ago · 7 km deep · 31 km away
57. 1.69 km NW of Cobb, CaliforniaThu, Dec 18, 3:25 AM PST · 14535 days ago · 1 km deep · 6 km away
58. 1.98 km ESE of Hidden Valley Lake, CaliforniaThu, Dec 18, 8:45 AM PST · 14535 days ago · 7 km deep · 31 km away
59. 1.96 km ENE of Sonoma, CaliforniaThu, Dec 18, 8:30 PM PST · 14534 days ago · 10 km deep · 68 km away
60. 1.66 km W of Cobb, CaliforniaFri, Dec 19, 12:44 AM PST · 14534 days ago · 3 km deep · 2 km away

The first 60 of 180.

Before

1. 1.66 km WSW of Cobb, CaliforniaSun, Dec 7, 9:10 AM PST · 14546 days ago · 0 km deep · 3 km away
2. 1.84 km WNW of Cobb, CaliforniaSat, Dec 6, 6:03 PM PST · 14546 days ago · 1 km deep · 5 km away
3. 1.79 km W of Cobb, CaliforniaSat, Dec 6, 5:51 AM PST · 14547 days ago · 2 km deep · 2 km away
4. 1.66 km W of Cobb, CaliforniaFri, Dec 5, 12:35 PM PST · 14547 days ago · 2 km deep · 1 km away
5. 1.76 km W of Cobb, CaliforniaFri, Dec 5, 12:33 PM PST · 14547 days ago · 0 km deep · 1 km away
6. 1.94 km WSW of Cobb, CaliforniaFri, Dec 5, 5:59 AM PST · 14548 days ago · 2 km deep · 4 km away
7. 1.910 km ESE of Hidden Valley Lake, CaliforniaFri, Dec 5, 12:09 AM PST · 14548 days ago · 6 km deep · 32 km away
8. 1.610 km ESE of Hidden Valley Lake, CaliforniaFri, Dec 5, 12:08 AM PST · 14548 days ago · 6 km deep · 32 km away
9. 1.73 km WSW of Cobb, CaliforniaThu, Dec 4, 8:14 AM PST · 14549 days ago · -1 km deep · 5 km away
10. 1.98 km W of Cobb, CaliforniaThu, Dec 4, 5:51 AM PST · 14549 days ago · 1 km deep · 1 km away
11. 2.67 km NE of Willits, CaliforniaWed, Dec 3, 10:45 PM PST · 14549 days ago · 7 km deep · 81 km away
12. 1.76 km W of Cobb, CaliforniaWed, Dec 3, 12:52 AM PST · 14550 days ago · 3 km deep · 2 km away
13. 2.75 km WSW of Cobb, CaliforniaTue, Dec 2, 1:51 AM PST · 14551 days ago · -1 km deep · 4 km away
14. 2.010 km ESE of Hidden Valley Lake, CaliforniaMon, Dec 1, 8:28 AM PST · 14552 days ago · 7 km deep · 32 km away
15. 2.05 km SW of Cobb, CaliforniaMon, Dec 1, 4:12 AM PST · 14552 days ago · 1 km deep · 6 km away
16. 1.89 km NW of Elk Creek, CaliforniaSun, Nov 30, 6:05 PM PST · 14552 days ago · 4 km deep · 94 km away
17. 1.67 km W of Cobb, CaliforniaSun, Nov 30, 1:52 PM PST · 14552 days ago · -1 km deep · 1 km away
18. 1.97 km W of Cobb, CaliforniaSun, Nov 30, 1:52 PM PST · 14552 days ago · 1 km deep · 1 km away
19. 1.76 km SW of Lower Lake, CaliforniaSun, Nov 30, 7:26 AM PST · 14553 days ago · -1 km deep · 14 km away
20. 1.94 km SW of Clearlake, CaliforniaSun, Nov 30, 7:24 AM PST · 14553 days ago · 3 km deep · 18 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1145702. Read Sun, Oct 4, 2026, 6:17 AM UTC.