M1.8 earthquake 8 km N of Upper Lake, California

Magnitude

1.8 (md), micro

Local time

Sun, Dec 1, 1985, 3:13 AM PST

UTC

1985-12-01 11:13:07 UTC

Depth

5.5 km (3.4 mi), shallow

Epicenter

39.242° N, 122.892° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 2.6 km horizontally, 1.1 km in depth

Magnitude uncertainty

±0.05

Depth from

From location

Station coverage gap

244°, poorly surrounded by stations

Stations used

5

• Upper Lake, CaliforniaPopulation 1,052. Forecast9 kmN
• Ukiah, CaliforniaPopulation 15,917. Forecast29 kmENE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast90 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast710 kmNW

After

1. 1.67 km WSW of Cobb, CaliforniaFri, Dec 13, 2:20 AM PST · 14893 days ago · 1 km deep · 50 km away
2. 1.69 km ENE of Hidden Valley Lake, CaliforniaFri, Dec 13, 4:17 AM PST · 14893 days ago · 9 km deep · 59 km away
3. 1.89 km ENE of Hidden Valley Lake, CaliforniaFri, Dec 13, 9:06 AM PST · 14893 days ago · 8 km deep · 59 km away
4. 1.66 km W of Cobb, CaliforniaFri, Dec 13, 4:17 PM PST · 14893 days ago · -1 km deep · 48 km away
5. 2.05 km WSW of Cobb, CaliforniaFri, Dec 13, 5:35 PM PST · 14893 days ago · 2 km deep · 49 km away
6. 1.67 km E of Willits, CaliforniaSat, Dec 14, 11:27 PM PST · 14892 days ago · 8 km deep · 38 km away
7. 1.66 km WSW of Cobb, CaliforniaSun, Dec 15, 5:30 AM PST · 14891 days ago · 3 km deep · 49 km away
8. 1.916 km NE of Lucerne, CaliforniaSun, Dec 15, 1:53 PM PST · 14891 days ago · 5 km deep · 18 km away
9. 2.25 km SW of Cobb, CaliforniaSun, Dec 15, 2:26 PM PST · 14891 days ago · 0 km deep · 52 km away
10. 1.68 km W of Cobb, CaliforniaMon, Dec 16, 3:51 AM PST · 14890 days ago · 1 km deep · 46 km away
11. 1.96 km W of Cobb, CaliforniaMon, Dec 16, 9:44 PM PST · 14890 days ago · 3 km deep · 48 km away
12. 2.05 km SW of Cobb, CaliforniaTue, Dec 17, 12:59 AM PST · 14890 days ago · 1 km deep · 52 km away
13. 1.54 km WSW of Cobb, CaliforniaTue, Dec 17, 3:30 PM PST · 14889 days ago · 1 km deep · 50 km away
14. 1.67 km W of Cobb, CaliforniaTue, Dec 17, 6:07 PM PST · 14889 days ago · 4 km deep · 48 km away
15. 1.77 km WSW of Cobb, CaliforniaWed, Dec 18, 2:51 AM PST · 14888 days ago · 1 km deep · 49 km away
16. 1.518 km ENE of Sea Ranch, CaliforniaWed, Dec 18, 9:56 PM PST · 14888 days ago · 3 km deep · 59 km away
17. 1.624 km WNW of Paskenta, CaliforniaWed, Dec 18, 10:10 PM PST · 14888 days ago · 4 km deep · 84 km away
18. 1.76 km W of Cobb, CaliforniaWed, Dec 18, 10:27 PM PST · 14888 days ago · 3 km deep · 48 km away
19. 2.39 km WSW of Cobb, CaliforniaThu, Dec 19, 2:05 AM PST · 14887 days ago · 1 km deep · 49 km away
20. 1.68 km WSW of Cobb, CaliforniaThu, Dec 19, 4:39 AM PST · 14887 days ago · 0 km deep · 50 km away
21. 1.57 km W of Cobb, CaliforniaThu, Dec 19, 11:51 AM PST · 14887 days ago · 3 km deep · 48 km away
22. 1.76 km W of Cobb, CaliforniaFri, Dec 20, 6:08 AM PST · 14886 days ago · 1 km deep · 46 km away
23. 1.78 km W of Cobb, CaliforniaSat, Dec 21, 6:19 AM PST · 14885 days ago · 0 km deep · 48 km away
24. 2.57 km W of Cobb, CaliforniaSat, Dec 21, 1:35 PM PST · 14885 days ago · 1 km deep · 48 km away
25. 1.78 km W of Cobb, CaliforniaSat, Dec 21, 6:14 PM PST · 14885 days ago · 1 km deep · 47 km away
26. 2.17 km WSW of Cobb, CaliforniaSat, Dec 21, 11:02 PM PST · 14885 days ago · 1 km deep · 49 km away
27. 1.94 km WNW of Cobb, CaliforniaSat, Dec 21, 11:46 PM PST · 14885 days ago · 0 km deep · 47 km away
28. 1.65 km W of Cobb, CaliforniaSun, Dec 22, 12:33 AM PST · 14885 days ago · 1 km deep · 48 km away
29. 1.57 km W of Cobb, CaliforniaSun, Dec 22, 7:21 AM PST · 14884 days ago · 3 km deep · 48 km away
30. 1.56 km W of Cobb, CaliforniaSun, Dec 22, 12:00 PM PST · 14884 days ago · 1 km deep · 46 km away
31. 1.77 km WSW of Cobb, CaliforniaSun, Dec 22, 12:45 PM PST · 14884 days ago · 0 km deep · 49 km away
32. 2.21 km S of Fulton, CaliforniaMon, Dec 23, 6:50 AM PST · 14883 days ago · 6 km deep · 85 km away
33. 2.526 km W of Paskenta, CaliforniaMon, Dec 23, 4:21 PM PST · 14883 days ago · -1 km deep · 77 km away
34. 1.722 km ENE of Potter Valley, CaliforniaTue, Dec 24, 1:15 AM PST · 14883 days ago · 10 km deep · 18 km away
35. 1.56 km W of Cobb, CaliforniaTue, Dec 24, 7:55 PM PST · 14882 days ago · 3 km deep · 47 km away
36. 1.77 km WSW of Cobb, CaliforniaTue, Dec 24, 8:32 PM PST · 14882 days ago · 1 km deep · 49 km away
37. 1.85 km W of Cobb, CaliforniaTue, Dec 24, 8:45 PM PST · 14882 days ago · -1 km deep · 48 km away
38. 1.97 km W of Cobb, CaliforniaWed, Dec 25, 7:48 AM PST · 14881 days ago · 1 km deep · 47 km away
39. 1.84 km SSW of Hopland, CaliforniaWed, Dec 25, 2:03 PM PST · 14881 days ago · 6 km deep · 40 km away
40. 1.910 km NNE of Brooktrails, CaliforniaThu, Dec 26, 2:22 AM PST · 14880 days ago · 8 km deep · 50 km away
41. 1.56 km W of Cobb, CaliforniaThu, Dec 26, 3:07 AM PST · 14880 days ago · 3 km deep · 48 km away
42. 1.84 km WSW of Cobb, CaliforniaThu, Dec 26, 4:14 AM PST · 14880 days ago · 1 km deep · 50 km away
43. 1.55 km WSW of Cobb, CaliforniaThu, Dec 26, 6:37 AM PST · 14880 days ago · 0 km deep · 50 km away
44. 1.64 km SSW of Hopland, CaliforniaThu, Dec 26, 5:23 PM PST · 14880 days ago · 6 km deep · 40 km away
45. 2.14 km SSW of Hopland, CaliforniaThu, Dec 26, 6:06 PM PST · 14880 days ago · 6 km deep · 40 km away
46. 2.09 km WSW of Cobb, CaliforniaFri, Dec 27, 1:15 AM PST · 14880 days ago · 2 km deep · 50 km away
47. 1.75 km W of Cobb, CaliforniaFri, Dec 27, 2:45 AM PST · 14879 days ago · 1 km deep · 47 km away
48. 1.99 km ENE of Hidden Valley Lake, CaliforniaFri, Dec 27, 5:06 AM PST · 14879 days ago · 9 km deep · 59 km away
49. 2.35 km SW of Cobb, CaliforniaFri, Dec 27, 12:34 PM PST · 14879 days ago · 0 km deep · 52 km away
50. 1.57 km WSW of Cobb, CaliforniaFri, Dec 27, 1:07 PM PST · 14879 days ago · 2 km deep · 49 km away
51. 2.34 km W of Cobb, CaliforniaSat, Dec 28, 1:29 PM PST · 14878 days ago · 0 km deep · 48 km away
52. 1.94 km W of Cobb, CaliforniaSat, Dec 28, 1:29 PM PST · 14878 days ago · 1 km deep · 48 km away
53. 1.64 km W of Cobb, CaliforniaSat, Dec 28, 1:30 PM PST · 14878 days ago · -1 km deep · 48 km away
54. 2.65 km SW of Cobb, CaliforniaSat, Dec 28, 2:26 PM PST · 14878 days ago · 0 km deep · 52 km away
55. 1.55 km SW of Cobb, CaliforniaSat, Dec 28, 2:32 PM PST · 14878 days ago · 0 km deep · 51 km away
56. 1.66 km WNW of Cobb, CaliforniaSat, Dec 28, 9:53 PM PST · 14878 days ago · 1 km deep · 46 km away
57. 1.57 km W of Cobb, CaliforniaSat, Dec 28, 11:31 PM PST · 14878 days ago · 2 km deep · 46 km away
58. 1.65 km SW of Cobb, CaliforniaSun, Dec 29, 7:35 PM PST · 14877 days ago · 0 km deep · 51 km away
59. 1.64 km S of Cobb, CaliforniaSun, Dec 29, 10:20 PM PST · 14877 days ago · 1 km deep · 53 km away
60. 1.64 km S of Cobb, CaliforniaSun, Dec 29, 10:21 PM PST · 14877 days ago · 2 km deep · 54 km away

The first 60 of 177.

From the USGS Earthquake Hazards Program and its partner networks, event nc1133376. Read Tue, Sep 22, 2026, 9:33 PM UTC.