M2.4 earthquake 20 km WSW of Williams, California

Magnitude

2.4 (md), micro

Local time

Sat, Mar 30, 1985, 4:47 AM PST

UTC

1985-03-30 12:47:52 UTC

Depth

0.3 km (0.2 mi), shallow

Epicenter

39.107° N, 122.375° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.4 km horizontally, 7.4 km in depth

Magnitude uncertainty

±0.14

Depth from

From location

Station coverage gap

173°

Stations used

16

• Williams, CaliforniaPopulation 5,196. Forecast20 kmWSW
• Clearlake, CaliforniaPopulation 15,182. Forecast27 kmNE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast80 kmNNE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast672 kmNNW

After

1. 2.16 km WSW of Cobb, CaliforniaTue, Apr 9, 3:50 AM PST · 15141 days ago · 3 km deep · 49 km away
2. 1.56 km WSW of Cobb, CaliforniaTue, Apr 9, 3:50 AM PST · 15141 days ago · 4 km deep · 49 km away
3. 1.513 km ESE of Hidden Valley Lake, CaliforniaTue, Apr 9, 5:08 AM PST · 15141 days ago · 5 km deep · 40 km away
4. 2.08 km WSW of Cobb, CaliforniaTue, Apr 9, 10:21 AM PST · 15141 days ago · 4 km deep · 51 km away
5. 1.67 km WSW of Cobb, CaliforniaTue, Apr 9, 1:08 PM PST · 15141 days ago · 1 km deep · 51 km away
6. 2.516 km NNE of Elk Creek, CaliforniaTue, Apr 9, 11:32 PM PST · 15140 days ago · 0 km deep · 71 km away
7. 2.24 km SW of Cobb, CaliforniaWed, Apr 10, 8:07 AM PST · 15140 days ago · 1 km deep · 49 km away
8. 2.29 km WSW of Cobb, CaliforniaWed, Apr 10, 2:34 PM PST · 15140 days ago · 1 km deep · 52 km away
9. 2.67 km WSW of Cobb, CaliforniaFri, Apr 12, 12:41 PM PST · 15138 days ago · 1 km deep · 50 km away
10. 2.57 km WSW of Cobb, CaliforniaFri, Apr 12, 12:43 PM PST · 15138 days ago · 1 km deep · 50 km away
11. 3.45 km SW of Cobb, CaliforniaSat, Apr 13, 2:15 AM PST · 15137 days ago · 1 km deep · 49 km away
12. 2.55 km SW of Cobb, CaliforniaSat, Apr 13, 2:16 AM PST · 15137 days ago · 1 km deep · 49 km away
13. 1.61 km S of Cotati, CaliforniaSat, Apr 13, 10:30 AM PST · 15137 days ago · 17 km deep · 92 km away
14. 1.67 km WSW of Cobb, CaliforniaSat, Apr 13, 11:14 AM PST · 15137 days ago · 3 km deep · 51 km away
15. 1.75 km W of Cobb, CaliforniaSun, Apr 14, 4:46 AM PST · 15136 days ago · 4 km deep · 48 km away
16. 2.23 km SW of Cobb, CaliforniaSun, Apr 14, 6:19 AM PST · 15136 days ago · 1 km deep · 47 km away
17. 2.0Northern CaliforniaSun, Apr 14, 7:55 AM PST · 15136 days ago · 1 km deep · 50 km away
18. 2.08 km WSW of Cobb, CaliforniaSun, Apr 14, 11:32 AM PST · 15136 days ago · 3 km deep · 51 km away
19. 2.58 km WNW of Guinda, CaliforniaSun, Apr 14, 7:33 PM PST · 15135 days ago · 2 km deep · 29 km away
20. 2.47 km WNW of Guinda, CaliforniaMon, Apr 15, 7:23 AM PST · 15135 days ago · 1 km deep · 29 km away
21. 2.28 km WSW of Cobb, CaliforniaMon, Apr 15, 1:50 PM PST · 15135 days ago · 0 km deep · 51 km away
22. 1.918 km NE of Upper Lake, CaliforniaMon, Apr 15, 6:36 PM PST · 15134 days ago · 7 km deep · 41 km away
23. 2.38 km WSW of Cobb, CaliforniaTue, Apr 16, 12:02 AM PST · 15134 days ago · 3 km deep · 51 km away
24. 2.0Northern CaliforniaWed, Apr 17, 6:44 AM PST · 15133 days ago · 1 km deep · 48 km away
25. 2.17 km NNW of Richvale, CaliforniaWed, Apr 17, 1:34 PM PST · 15133 days ago · 5 km deep · 71 km away
26. 2.07 km W of Cobb, CaliforniaWed, Apr 17, 10:10 PM PST · 15132 days ago · 1 km deep · 49 km away
27. 2.221 km WSW of Williams, CaliforniaWed, Apr 17, 10:57 PM PST · 15132 days ago · 0 km deep · 2 km away
28. 3.710 km WSW of Meridian, CaliforniaThu, Apr 18, 8:29 AM PST · 15132 days ago · 18 km deep · 29 km away
29. 2.29 km WSW of Meridian, CaliforniaThu, Apr 18, 8:40 AM PST · 15132 days ago · 12 km deep · 31 km away
30. 1.67 km WSW of Cobb, CaliforniaThu, Apr 18, 6:01 PM PST · 15131 days ago · 0 km deep · 50 km away
31. 1.611 km W of Cobb, CaliforniaFri, Apr 19, 10:37 AM PST · 15131 days ago · -1 km deep · 53 km away
32. 1.77 km W of Cobb, CaliforniaFri, Apr 19, 10:37 AM PST · 15131 days ago · 0 km deep · 50 km away
33. 2.57 km W of Cobb, CaliforniaFri, Apr 19, 10:38 AM PST · 15131 days ago · 1 km deep · 49 km away
34. 2.57 km W of Cobb, CaliforniaFri, Apr 19, 10:42 AM PST · 15131 days ago · 1 km deep · 49 km away
35. 1.67 km W of Cobb, CaliforniaFri, Apr 19, 10:42 AM PST · 15131 days ago · 1 km deep · 49 km away
36. 2.57 km W of Cobb, CaliforniaFri, Apr 19, 10:49 AM PST · 15131 days ago · 1 km deep · 49 km away
37. 2.014 km N of Upper Lake, CaliforniaFri, Apr 19, 3:19 PM PST · 15131 days ago · 5 km deep · 51 km away
38. 2.88 km NNE of Arbuckle, CaliforniaFri, Apr 19, 10:52 PM PST · 15130 days ago · 3 km deep · 31 km away
39. 1.710 km ESE of Covelo, CaliforniaSat, Apr 20, 6:24 AM PST · 15130 days ago · 1 km deep · 97 km away
40. 2.322 km WSW of Williams, CaliforniaSat, Apr 20, 12:30 PM PST · 15130 days ago · 3 km deep · 2 km away
41. 1.57 km W of Cobb, CaliforniaSat, Apr 20, 6:09 PM PST · 15129 days ago · 1 km deep · 49 km away
42. 1.66 km W of Cobb, CaliforniaSun, Apr 21, 7:40 AM PST · 15129 days ago · 3 km deep · 48 km away
43. 1.68 km WSW of Cobb, CaliforniaSun, Apr 21, 8:07 AM PST · 15129 days ago · 3 km deep · 51 km away
44. 2.41 km SSW of Green Valley, CaliforniaSun, Apr 21, 8:19 AM PST · 15129 days ago · 12 km deep · 98 km away
45. 2.02 km S of Green Valley, CaliforniaSun, Apr 21, 8:21 AM PST · 15129 days ago · 11 km deep · 99 km away
46. 2.58 km WSW of Meridian, CaliforniaSun, Apr 21, 12:20 PM PST · 15129 days ago · 12 km deep · 31 km away
47. 1.64 km SW of Hopland, CaliforniaSun, Apr 21, 3:09 PM PST · 15129 days ago · 5 km deep · 70 km away
48. 2.37 km WSW of Cobb, CaliforniaMon, Apr 22, 5:35 PM PST · 15127 days ago · 4 km deep · 51 km away
49. 1.66 km W of Cobb, CaliforniaMon, Apr 22, 10:12 PM PST · 15127 days ago · 1 km deep · 49 km away
50. 1.78 km WSW of Cobb, CaliforniaTue, Apr 23, 6:01 AM PST · 15127 days ago · 3 km deep · 51 km away
51. 1.85 km NNW of Geyserville, CaliforniaTue, Apr 23, 8:08 PM PST · 15126 days ago · 5 km deep · 62 km away
52. 1.97 km WSW of Cobb, CaliforniaThu, Apr 25, 1:35 PM PST · 15125 days ago · 2 km deep · 50 km away
53. 1.97 km WSW of Cobb, CaliforniaFri, Apr 26, 2:19 AM PST · 15124 days ago · 1 km deep · 50 km away
54. 2.16 km W of Cobb, CaliforniaFri, Apr 26, 10:49 PM PST · 15123 days ago · 3 km deep · 48 km away
55. 2.06 km W of Cobb, CaliforniaFri, Apr 26, 10:50 PM PST · 15123 days ago · 3 km deep · 48 km away
56. 2.28 km WSW of Cobb, CaliforniaSat, Apr 27, 5:37 AM PST · 15123 days ago · 3 km deep · 51 km away
57. 1.76 km NE of Brooktrails, CaliforniaSat, Apr 27, 3:57 PM PST · 15123 days ago · 6 km deep · 92 km away
58. 1.7Northern CaliforniaSun, Apr 28, 1:13 PM PDT · 15122 days ago · 2 km deep · 50 km away
59. 2.1Northern CaliforniaSun, Apr 28, 3:51 PM PDT · 15122 days ago · 2 km deep · 70 km away
60. 2.74 km W of Cobb, CaliforniaSun, Apr 28, 6:37 PM PDT · 15121 days ago · 0 km deep · 47 km away

The first 60 of 180.

From the USGS Earthquake Hazards Program and its partner networks, event nc44975. Read Tue, Sep 22, 2026, 11:33 AM UTC.