M3.4 earthquake 9 km NNW of Princeton, California

Magnitude

3.4 (md), minor

Local time

Sat, Sep 7, 1985, 10:13 PM PDT

UTC

1985-09-08 05:13:31 UTC

Depth

18.9 km (11.8 mi), shallow

Epicenter

39.482° N, 122.057° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.5 km horizontally, 0.8 km in depth

Magnitude uncertainty

±0.20

Depth from

From location

Station coverage gap

75°

Stations used

76

• Willows, CaliforniaPopulation 6,069. Forecast13 kmESE
• Chico, CaliforniaPopulation 121,345. Forecast33 kmSW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast693 kmNNW

After

1. 1.74 km SSW of Cobb, CaliforniaSun, Sep 8, 12:33 AM PDT · 14989 days ago · 2 km deep · 98 km away
2. 1.98 km W of Cobb, CaliforniaMon, Sep 9, 6:19 AM PDT · 14988 days ago · 1 km deep · 99 km away
3. 1.59 km ESE of Hidden Valley Lake, CaliforniaMon, Sep 9, 8:59 PM PDT · 14987 days ago · 4 km deep · 87 km away
4. 1.89 km W of Cobb, CaliforniaMon, Sep 9, 11:46 PM PDT · 14987 days ago · 1 km deep · 100 km away
5. 1.78 km W of Cobb, CaliforniaMon, Sep 9, 11:47 PM PDT · 14987 days ago · 0 km deep · 100 km away
6. 1.99 km NW of Cobb, CaliforniaMon, Sep 9, 11:47 PM PDT · 14987 days ago · 1 km deep · 94 km away
7. 1.63 km SW of Cobb, CaliforniaTue, Sep 10, 9:41 AM PDT · 14987 days ago · 0 km deep · 97 km away
8. 2.010 km NW of Cobb, CaliforniaTue, Sep 10, 1:18 PM PDT · 14987 days ago · 0 km deep · 94 km away
9. 2.06 km W of Cobb, CaliforniaTue, Sep 10, 1:30 PM PDT · 14987 days ago · 1 km deep · 98 km away
10. 1.920 km NE of Upper Lake, CaliforniaTue, Sep 10, 3:44 PM PDT · 14987 days ago · -1 km deep · 64 km away
11. 1.96 km W of Cobb, CaliforniaWed, Sep 11, 11:39 AM PDT · 14986 days ago · 4 km deep · 97 km away
12. 1.98 km W of Cobb, CaliforniaThu, Sep 12, 7:15 AM PDT · 14985 days ago · 1 km deep · 98 km away
13. 1.812 km NE of Upper Lake, CaliforniaThu, Sep 12, 8:59 AM PDT · 14985 days ago · 2 km deep · 70 km away
14. 2.2Northern CaliforniaThu, Sep 12, 7:01 PM PDT · 14984 days ago · 2 km deep · 69 km away
15. 1.66 km W of Cobb, CaliforniaFri, Sep 13, 5:23 AM PDT · 14984 days ago · 0 km deep · 97 km away
16. 2.512 km NE of Upper Lake, CaliforniaFri, Sep 13, 12:07 PM PDT · 14984 days ago · 3 km deep · 69 km away
17. 1.64 km W of Cobb, CaliforniaFri, Sep 13, 1:03 PM PDT · 14984 days ago · 0 km deep · 96 km away
18. 1.68 km W of Cobb, CaliforniaFri, Sep 13, 1:09 PM PDT · 14984 days ago · 1 km deep · 99 km away
19. 2.44 km E of Williams, CaliforniaFri, Sep 13, 4:22 PM PDT · 14984 days ago · 16 km deep · 37 km away
20. 1.65 km W of Cobb, CaliforniaFri, Sep 13, 5:16 PM PDT · 14984 days ago · 1 km deep · 97 km away
21. 1.812 km NE of Upper Lake, CaliforniaFri, Sep 13, 7:29 PM PDT · 14983 days ago · 2 km deep · 69 km away
22. 1.85 km W of Cobb, CaliforniaSat, Sep 14, 6:03 AM PDT · 14983 days ago · 0 km deep · 98 km away
23. 1.612 km NE of Upper Lake, CaliforniaSat, Sep 14, 11:08 AM PDT · 14983 days ago · 4 km deep · 70 km away
24. 1.94 km WSW of Cobb, CaliforniaSat, Sep 14, 5:26 PM PDT · 14983 days ago · 1 km deep · 97 km away
25. 2.36 km W of Cobb, CaliforniaSat, Sep 14, 6:28 PM PDT · 14982 days ago · 3 km deep · 97 km away
26. 1.86 km W of Cobb, CaliforniaSun, Sep 15, 4:14 AM PDT · 14982 days ago · 3 km deep · 97 km away
27. 1.66 km WNW of Cobb, CaliforniaSun, Sep 15, 5:53 AM PDT · 14982 days ago · 1 km deep · 96 km away
28. 1.78 km WNW of Cobb, CaliforniaSun, Sep 15, 5:56 AM PDT · 14982 days ago · -1 km deep · 94 km away
29. 2.05 km NE of Williams, CaliforniaSun, Sep 15, 2:49 PM PDT · 14982 days ago · 18 km deep · 34 km away
30. 1.86 km E of Williams, CaliforniaSun, Sep 15, 6:28 PM PDT · 14981 days ago · 4 km deep · 36 km away
31. 1.66 km W of Cobb, CaliforniaSun, Sep 15, 8:07 PM PDT · 14981 days ago · 3 km deep · 98 km away
32. 3.67 km W of Cobb, CaliforniaSun, Sep 15, 11:03 PM PDT · 14981 days ago · 10 km deep · 98 km away
33. 2.15 km SW of Cobb, CaliforniaMon, Sep 16, 3:25 AM PDT · 14981 days ago · -1 km deep · 99 km away
34. 1.95 km SW of Cobb, CaliforniaMon, Sep 16, 3:27 AM PDT · 14981 days ago · 0 km deep · 99 km away
35. 1.76 km W of Cobb, CaliforniaMon, Sep 16, 11:36 AM PDT · 14981 days ago · 2 km deep · 98 km away
36. 1.95 km SW of Cobb, CaliforniaMon, Sep 16, 1:40 PM PDT · 14981 days ago · 0 km deep · 99 km away
37. 1.86 km WSW of Cobb, CaliforniaMon, Sep 16, 5:20 PM PDT · 14981 days ago · 4 km deep · 98 km away
38. 1.65 km SW of Cobb, CaliforniaMon, Sep 16, 8:59 PM PDT · 14980 days ago · 0 km deep · 99 km away
39. 2.55 km SW of Cobb, CaliforniaTue, Sep 17, 12:48 AM PDT · 14980 days ago · 1 km deep · 99 km away
40. 2.55 km ENE of Williams, CaliforniaTue, Sep 17, 8:44 PM PDT · 14979 days ago · 10 km deep · 34 km away
41. 2.09 km WNW of Arbuckle, CaliforniaTue, Sep 17, 9:03 PM PDT · 14979 days ago · 5 km deep · 47 km away
42. 2.07 km ESE of Williams, CaliforniaTue, Sep 17, 9:11 PM PDT · 14979 days ago · 8 km deep · 40 km away
43. 2.36 km ENE of Williams, CaliforniaTue, Sep 17, 9:13 PM PDT · 14979 days ago · 16 km deep · 35 km away
44. 1.66 km SW of Cobb, CaliforniaTue, Sep 17, 11:15 PM PDT · 14979 days ago · 0 km deep · 99 km away
45. 1.85 km E of Clearlake Oaks, CaliforniaWed, Sep 18, 8:52 AM PDT · 14979 days ago · -1 km deep · 69 km away
46. 2.14 km SW of Cobb, CaliforniaThu, Sep 19, 12:01 AM PDT · 14978 days ago · -1 km deep · 97 km away
47. 1.610 km NW of Cobb, CaliforniaThu, Sep 19, 11:10 AM PDT · 14978 days ago · 1 km deep · 94 km away
48. 2.013 km SW of Durham, CaliforniaThu, Sep 19, 3:01 PM PDT · 14978 days ago · 18 km deep · 15 km away
49. 1.86 km WSW of Cobb, CaliforniaThu, Sep 19, 9:37 PM PDT · 14977 days ago · 1 km deep · 99 km away
50. 1.97 km W of Cobb, CaliforniaThu, Sep 19, 9:38 PM PDT · 14977 days ago · 0 km deep · 99 km away
51. 2.16 km W of Cobb, CaliforniaThu, Sep 19, 11:40 PM PDT · 14977 days ago · 1 km deep · 97 km away
52. 2.27 km W of Cobb, CaliforniaFri, Sep 20, 5:20 AM PDT · 14977 days ago · 3 km deep · 98 km away
53. 2.127 km ESE of Covelo, CaliforniaFri, Sep 20, 5:57 AM PDT · 14977 days ago · 4 km deep · 81 km away
54. 1.95 km SW of Cobb, CaliforniaFri, Sep 20, 11:31 PM PDT · 14976 days ago · 2 km deep · 99 km away
55. 2.46 km W of Cobb, CaliforniaSat, Sep 21, 3:26 PM PDT · 14976 days ago · 1 km deep · 96 km away
56. 1.99 km W of Cobb, CaliforniaSun, Sep 22, 4:21 PM PDT · 14975 days ago · 0 km deep · 100 km away
57. 1.57 km WSW of Cobb, CaliforniaSun, Sep 22, 4:32 PM PDT · 14975 days ago · 0 km deep · 100 km away
58. 1.63 km SW of Cobb, CaliforniaSun, Sep 22, 6:51 PM PDT · 14974 days ago · 1 km deep · 97 km away
59. 1.57 km W of Cobb, CaliforniaMon, Sep 23, 2:17 AM PDT · 14974 days ago · 1 km deep · 98 km away
60. 1.65 km WSW of Cobb, CaliforniaMon, Sep 23, 7:48 AM PDT · 14974 days ago · 1 km deep · 98 km away

The first 60 of 177.

From the USGS Earthquake Hazards Program and its partner networks, event nc54724 (also filed as usp0002jhd). Read Tue, Sep 22, 2026, 12:18 PM UTC.