M3.1 earthquake 5 km SW of Cobb, California

Magnitude

3.1 (Md, duration), minor

Magnitude from

Northern California Seismic System

Local time

Sat, Aug 6, 1983, 11:09 PM PDT

UTC

1983-08-07 06:09:24 UTC

Depth

0.3 km (0.2 mi), shallow

Epicenter

38.785° N, 122.769° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.3 km in depth

Magnitude uncertainty

±0.14

Depth from

From location

Station coverage gap

38°

Stations used

30

• Cobb, CaliforniaPopulation 1,778. Forecast6 kmSW
• Healdsburg, CaliforniaPopulation 11,742. Forecast21 kmNNE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast39 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast664 kmNW

After

1. 2.85 km SW of Cobb, CaliforniaSat, Aug 6, 11:10 PM PDT · 15762 days ago · 0 km deep · 1 km away
2. 1.65 km WSW of Cobb, CaliforniaSun, Aug 7, 3:17 AM PDT · 15762 days ago · 1 km deep · 2 km away
3. 1.60 km W of Kelseyville, CaliforniaSun, Aug 7, 5:34 PM PDT · 15761 days ago · 2 km deep · 22 km away
4. 1.96 km W of Cobb, CaliforniaSun, Aug 7, 6:10 PM PDT · 15761 days ago · 3 km deep · 4 km away
5. 1.713 km NNW of Moskowite Corner, CaliforniaSun, Aug 7, 11:10 PM PDT · 15761 days ago · 0 km deep · 51 km away
6. 1.612 km WNW of Cobb, CaliforniaMon, Aug 8, 10:18 PM PDT · 15760 days ago · 1 km deep · 11 km away
7. 1.67 km W of Cobb, CaliforniaWed, Aug 10, 3:49 AM PDT · 15759 days ago · 3 km deep · 5 km away
8. 1.8Northern CaliforniaWed, Aug 10, 12:11 PM PDT · 15758 days ago · 7 km deep · 24 km away
9. 1.7near the coast of Northern CaliforniaWed, Aug 10, 2:47 PM PDT · 15758 days ago · 4 km deep · 29 km away
10. 2.16 km WSW of Cobb, CaliforniaWed, Aug 10, 5:45 PM PDT · 15758 days ago · 1 km deep · 3 km away
11. 1.66 km W of Cobb, CaliforniaThu, Aug 11, 10:05 PM PDT · 15757 days ago · 4 km deep · 5 km away
12. 1.57 km W of Cobb, CaliforniaFri, Aug 12, 4:23 AM PDT · 15757 days ago · 3 km deep · 5 km away
13. 1.94 km SE of Guerneville, CaliforniaFri, Aug 12, 5:47 PM PDT · 15756 days ago · 2 km deep · 38 km away
14. 1.79 km ESE of Willits, CaliforniaFri, Aug 12, 9:42 PM PDT · 15756 days ago · 7 km deep · 78 km away
15. 1.51 km SSW of Bodega Bay, CaliforniaSat, Aug 13, 4:02 AM PDT · 15756 days ago · 4 km deep · 57 km away
16. 1.53 km SE of Clear Lake Riviera, CaliforniaSat, Aug 13, 5:42 AM PDT · 15755 days ago · 1 km deep · 18 km away
17. 2.03 km SE of Calpella, CaliforniaSun, Aug 14, 6:14 AM PDT · 15754 days ago · 5 km deep · 59 km away
18. 1.85 km WSW of Cobb, CaliforniaSun, Aug 14, 12:05 PM PDT · 15754 days ago · -1 km deep · 1 km away
19. 2.05 km WSW of Cobb, CaliforniaSun, Aug 14, 12:06 PM PDT · 15754 days ago · 0 km deep · 2 km away
20. 1.819 km NNE of Upper Lake, CaliforniaMon, Aug 15, 12:12 PM PDT · 15753 days ago · 5 km deep · 61 km away
21. 1.75 km W of Cobb, CaliforniaTue, Aug 16, 5:12 AM PDT · 15752 days ago · 2 km deep · 4 km away
22. 1.84 km WSW of Cobb, CaliforniaTue, Aug 16, 5:42 AM PDT · 15752 days ago · 1 km deep · 2 km away
23. 2.01 km ESE of Larkfield-Wikiup, CaliforniaTue, Aug 16, 8:26 AM PDT · 15752 days ago · 4 km deep · 31 km away
24. 1.89 km WSW of Cobb, CaliforniaTue, Aug 16, 11:45 AM PDT · 15752 days ago · 2 km deep · 5 km away
25. 1.56 km WSW of Cobb, CaliforniaWed, Aug 17, 8:08 PM PDT · 15751 days ago · 0 km deep · 3 km away
26. 2.06 km ESE of Willits, CaliforniaWed, Aug 17, 11:52 PM PDT · 15751 days ago · 9 km deep · 81 km away
27. 1.66 km ESE of Willits, CaliforniaThu, Aug 18, 12:07 AM PDT · 15751 days ago · 9 km deep · 81 km away
28. 1.822 km NE of Potter Valley, CaliforniaThu, Aug 18, 12:22 AM PDT · 15751 days ago · 7 km deep · 79 km away
29. 2.04 km NNE of Glen Ellen, CaliforniaThu, Aug 18, 9:12 AM PDT · 15750 days ago · 3 km deep · 49 km away
30. 2.53 km ESE of Kenwood, CaliforniaThu, Aug 18, 5:02 PM PDT · 15750 days ago · 1 km deep · 49 km away
31. 2.25 km SW of Cobb, CaliforniaThu, Aug 18, 8:17 PM PDT · 15750 days ago · -1 km deep · 1 km away
32. 2.06 km SW of Cobb, CaliforniaThu, Aug 18, 8:17 PM PDT · 15750 days ago · -1 km deep · 1 km away
33. 2.37 km W of Cobb, CaliforniaThu, Aug 18, 10:52 PM PDT · 15750 days ago · 2 km deep · 4 km away
34. 1.98 km WSW of Cobb, CaliforniaFri, Aug 19, 5:05 AM PDT · 15749 days ago · 3 km deep · 4 km away
35. 2.29 km WSW of Cobb, CaliforniaSat, Aug 20, 1:18 AM PDT · 15749 days ago · 2 km deep · 5 km away
36. 3.07 km W of Cobb, CaliforniaSat, Aug 20, 4:32 PM PDT · 15748 days ago · 3 km deep · 5 km away
37. 1.68 km WSW of Cobb, CaliforniaSun, Aug 21, 11:50 PM PDT · 15747 days ago · 2 km deep · 5 km away
38. 1.77 km W of Cobb, CaliforniaMon, Aug 22, 5:04 AM PDT · 15746 days ago · 3 km deep · 5 km away
39. 1.65 km W of Cobb, CaliforniaMon, Aug 22, 5:50 AM PDT · 15746 days ago · 0 km deep · 4 km away
40. 1.89 km W of Redwood Valley, CaliforniaMon, Aug 22, 4:12 PM PDT · 15746 days ago · 6 km deep · 72 km away
41. 3.16 km WSW of Cobb, CaliforniaTue, Aug 23, 1:40 PM PDT · 15745 days ago · 1 km deep · 3 km away
42. 2.16 km WSW of Cobb, CaliforniaTue, Aug 23, 1:44 PM PDT · 15745 days ago · -1 km deep · 3 km away
43. 1.67 km WSW of Cobb, CaliforniaTue, Aug 23, 1:53 PM PDT · 15745 days ago · -1 km deep · 3 km away
44. 1.7Northern CaliforniaTue, Aug 23, 2:41 PM PDT · 15745 days ago · -1 km deep · 4 km away
45. 1.69 km WSW of Cobb, CaliforniaTue, Aug 23, 2:58 PM PDT · 15745 days ago · 1 km deep · 5 km away
46. 1.57 km WSW of Cobb, CaliforniaWed, Aug 24, 12:38 AM PDT · 15745 days ago · 2 km deep · 4 km away
47. 1.626 km N of Potter Valley, CaliforniaWed, Aug 24, 1:25 PM PDT · 15744 days ago · -1 km deep · 91 km away
48. 1.87 km ENE of Brooktrails, CaliforniaWed, Aug 24, 4:37 PM PDT · 15744 days ago · 8 km deep · 89 km away
49. 1.75 km SW of Oakville, CaliforniaWed, Aug 24, 10:14 PM PDT · 15744 days ago · 4 km deep · 51 km away
50. 2.07 km W of Cobb, CaliforniaThu, Aug 25, 8:58 AM PDT · 15743 days ago · 3 km deep · 4 km away
51. 3.07 km WSW of Cobb, CaliforniaThu, Aug 25, 3:23 PM PDT · 15743 days ago · 1 km deep · 3 km away
52. 1.76 km S of Cobb, CaliforniaThu, Aug 25, 4:21 PM PDT · 15743 days ago · 0 km deep · 5 km away
53. 1.76 km ESE of Calpella, CaliforniaThu, Aug 25, 4:49 PM PDT · 15743 days ago · -1 km deep · 58 km away
54. 1.66 km W of Cobb, CaliforniaThu, Aug 25, 9:58 PM PDT · 15743 days ago · 2 km deep · 4 km away
55. 1.64 km S of Cobb, CaliforniaThu, Aug 25, 10:38 PM PDT · 15743 days ago · 0 km deep · 4 km away
56. 2.37 km WSW of Cobb, CaliforniaFri, Aug 26, 2:25 AM PDT · 15743 days ago · 0 km deep · 4 km away
57. 1.87 km W of Cobb, CaliforniaFri, Aug 26, 4:10 AM PDT · 15743 days ago · 3 km deep · 5 km away
58. 1.65 km SSW of Cobb, CaliforniaFri, Aug 26, 1:47 PM PDT · 15742 days ago · 0 km deep · 1 km away
59. 1.66 km WSW of Cobb, CaliforniaSat, Aug 27, 6:20 PM PDT · 15741 days ago · 1 km deep · 4 km away
60. 1.66 km W of Cobb, CaliforniaSun, Aug 28, 6:34 PM PDT · 15740 days ago · 1 km deep · 4 km away

The first 60 of 185.

Before

1. 1.78 km NW of Redwood Valley, CaliforniaFri, Aug 5, 8:20 PM PDT · 15763 days ago · 5 km deep · 74 km away
2. 2.16 km W of Cobb, CaliforniaFri, Aug 5, 5:11 PM PDT · 15763 days ago · 1 km deep · 4 km away
3. 1.67 km ENE of Brooktrails, CaliforniaFri, Aug 5, 8:33 AM PDT · 15763 days ago · 8 km deep · 90 km away
4. 1.66 km WSW of Cobb, CaliforniaThu, Aug 4, 3:09 PM PDT · 15764 days ago · 4 km deep · 3 km away
5. 1.67 km W of Cobb, CaliforniaThu, Aug 4, 12:19 PM PDT · 15764 days ago · 3 km deep · 5 km away
6. 2.57 km W of Cobb, CaliforniaThu, Aug 4, 9:20 AM PDT · 15764 days ago · 3 km deep · 5 km away
7. 1.914 km N of Potter Valley, CaliforniaThu, Aug 4, 3:46 AM PDT · 15765 days ago · 8 km deep · 80 km away
8. 2.17 km WSW of Cobb, CaliforniaWed, Aug 3, 8:11 AM PDT · 15765 days ago · 2 km deep · 4 km away
9. 2.36 km ESE of Santa Rosa, CaliforniaMon, Aug 1, 8:11 PM PDT · 15767 days ago · 0 km deep · 42 km away
10. 1.67 km WSW of Cobb, CaliforniaMon, Aug 1, 10:24 AM PDT · 15767 days ago · 3 km deep · 3 km away
11. 2.27 km W of Cobb, CaliforniaMon, Aug 1, 10:11 AM PDT · 15767 days ago · 3 km deep · 5 km away
12. 1.85 km WSW of Cobb, CaliforniaMon, Aug 1, 9:29 AM PDT · 15767 days ago · 0 km deep · 2 km away
13. 1.95 km NNE of Cobb, CaliforniaMon, Aug 1, 7:02 AM PDT · 15767 days ago · 1 km deep · 11 km away
14. 1.59 km NW of Redwood Valley, CaliforniaSun, Jul 31, 10:56 PM PDT · 15768 days ago · 6 km deep · 74 km away
15. 2.99 km E of Hidden Valley Lake, CaliforniaSun, Jul 31, 5:04 PM PDT · 15768 days ago · 8 km deep · 28 km away
16. 1.97 km W of Cobb, CaliforniaSun, Jul 31, 9:33 AM PDT · 15768 days ago · 3 km deep · 5 km away
17. 1.67 km W of Cobb, CaliforniaSat, Jul 30, 8:35 PM PDT · 15769 days ago · 0 km deep · 5 km away
18. 1.910 km NE of Cazadero, CaliforniaSat, Jul 30, 7:10 PM PDT · 15769 days ago · 1 km deep · 29 km away
19. 1.96 km WSW of Cobb, CaliforniaSat, Jul 30, 6:52 PM PDT · 15769 days ago · 2 km deep · 3 km away
20. 1.68 km WSW of Cobb, CaliforniaSat, Jul 30, 4:53 AM PDT · 15769 days ago · 1 km deep · 5 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1099983. Read Thu, Oct 1, 2026, 10:54 PM UTC.