M1.7 earthquake 5 km SW of Cobb, California

Magnitude

1.7 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Mon, Sep 5, 1983, 7:20 AM PDT

UTC

1983-09-05 14:20:10 UTC

Depth

0.2 km (0.1 mi), shallow

Epicenter

38.790° N, 122.776° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 1.4 km in depth

Magnitude uncertainty

±0.40

Depth from

From location

Station coverage gap

95°

Stations used

8

• Cobb, CaliforniaPopulation 1,778. Forecast6 kmSW
• Healdsburg, CaliforniaPopulation 11,742. Forecast22 kmNNE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast39 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast665 kmNW

After

1. 1.710 km NNE of Cloverdale, CaliforniaMon, Sep 5, 8:45 AM PDT · 15732 days ago · 12 km deep · 22 km away
2. 1.78 km WSW of Cobb, CaliforniaMon, Sep 5, 6:25 PM PDT · 15732 days ago · 3 km deep · 3 km away
3. 2.69 km WSW of Cobb, CaliforniaMon, Sep 5, 11:42 PM PDT · 15731 days ago · 1 km deep · 5 km away
4. 1.67 km SSE of Cobb, CaliforniaTue, Sep 6, 2:12 AM PDT · 15731 days ago · -1 km deep · 7 km away
5. 1.98 km WSW of Cobb, CaliforniaTue, Sep 6, 7:03 AM PDT · 15731 days ago · 1 km deep · 4 km away
6. 2.66 km W of Cobb, CaliforniaWed, Sep 7, 3:48 AM PDT · 15730 days ago · 3 km deep · 4 km away
7. 1.87 km W of Cobb, CaliforniaThu, Sep 8, 11:26 AM PDT · 15729 days ago · 0 km deep · 5 km away
8. 1.76 km W of Cobb, CaliforniaThu, Sep 8, 4:04 PM PDT · 15729 days ago · 3 km deep · 4 km away
9. 2.06 km W of Cobb, CaliforniaThu, Sep 8, 5:47 PM PDT · 15729 days ago · 3 km deep · 4 km away
10. 2.06 km SE of College City, CaliforniaFri, Sep 9, 7:15 AM PDT · 15728 days ago · 1 km deep · 74 km away
11. 2.18 km WSW of Cobb, CaliforniaFri, Sep 9, 7:22 AM PDT · 15728 days ago · -1 km deep · 4 km away
12. 2.57 km NNE of Dunnigan, CaliforniaFri, Sep 9, 9:04 AM PDT · 15728 days ago · 2 km deep · 74 km away
13. 2.63 km WNW of Dunnigan, CaliforniaFri, Sep 9, 10:45 AM PDT · 15728 days ago · 11 km deep · 67 km away
14. 2.35 km SW of Cobb, CaliforniaFri, Sep 9, 3:03 PM PDT · 15728 days ago · 0 km deep · 0 km away
15. 1.89 km S of Moskowite Corner, CaliforniaSat, Sep 10, 2:35 PM PDT · 15727 days ago · 7 km deep · 70 km away
16. 1.510 km ESE of Hidden Valley Lake, CaliforniaSun, Sep 11, 1:15 AM PDT · 15726 days ago · 6 km deep · 29 km away
17. 1.58 km NNW of Redwood Valley, CaliforniaSun, Sep 11, 2:10 PM PDT · 15726 days ago · 8 km deep · 73 km away
18. 1.86 km S of Cobb, CaliforniaSun, Sep 11, 4:51 PM PDT · 15726 days ago · 0 km deep · 6 km away
19. 1.615 km ESE of Comptche, CaliforniaMon, Sep 12, 1:47 AM PDT · 15725 days ago · -1 km deep · 74 km away
20. 1.69 km WSW of Cobb, CaliforniaMon, Sep 12, 10:26 PM PDT · 15724 days ago · 2 km deep · 4 km away
21. 1.96 km WSW of Cobb, CaliforniaWed, Sep 14, 9:59 AM PDT · 15723 days ago · -1 km deep · 2 km away
22. 1.74 km W of Cobb, CaliforniaThu, Sep 15, 6:41 AM PDT · 15722 days ago · 4 km deep · 4 km away
23. 1.66 km S of Cobb, CaliforniaThu, Sep 15, 9:47 PM PDT · 15721 days ago · -1 km deep · 6 km away
24. 1.87 km W of Cobb, CaliforniaFri, Sep 16, 4:11 AM PDT · 15721 days ago · 3 km deep · 4 km away
25. 1.615 km NE of Clearlake, CaliforniaFri, Sep 16, 8:46 AM PDT · 15721 days ago · 2 km deep · 38 km away
26. 2.06 km W of Cobb, CaliforniaFri, Sep 16, 11:25 AM PDT · 15721 days ago · 7 km deep · 3 km away
27. 2.014 km N of Upper Lake, CaliforniaFri, Sep 16, 1:52 PM PDT · 15721 days ago · 15 km deep · 57 km away
28. 1.611 km NNE of Cloverdale, CaliforniaFri, Sep 16, 4:27 PM PDT · 15721 days ago · 4 km deep · 21 km away
29. 2.16 km WSW of Cobb, CaliforniaFri, Sep 16, 4:35 PM PDT · 15721 days ago · 0 km deep · 3 km away
30. 1.96 km WSW of Cobb, CaliforniaFri, Sep 16, 4:35 PM PDT · 15721 days ago · 0 km deep · 2 km away
31. 2.06 km WSW of Cobb, CaliforniaFri, Sep 16, 4:44 PM PDT · 15721 days ago · 3 km deep · 3 km away
32. 1.85 km SW of Cobb, CaliforniaSat, Sep 17, 9:23 AM PDT · 15720 days ago · 0 km deep · 0 km away
33. 2.311 km ESE of Hidden Valley Lake, CaliforniaSat, Sep 17, 11:20 AM PDT · 15720 days ago · 4 km deep · 30 km away
34. 1.55 km ENE of Willits, CaliforniaSat, Sep 17, 4:42 PM PDT · 15720 days ago · 5 km deep · 84 km away
35. 2.04 km ESE of Vallejo, CaliforniaSat, Sep 17, 8:12 PM PDT · 15719 days ago · 5 km deep · 92 km away
36. 2.417 km N of Upper Lake, CaliforniaSun, Sep 18, 12:03 AM PDT · 15719 days ago · 6 km deep · 60 km away
37. 2.5Northern CaliforniaSun, Sep 18, 7:42 PM PDT · 15718 days ago · 1 km deep · 3 km away
38. 1.65 km W of Cobb, CaliforniaMon, Sep 19, 8:35 AM PDT · 15718 days ago · 1 km deep · 3 km away
39. 2.16 km W of Cobb, CaliforniaMon, Sep 19, 9:38 AM PDT · 15718 days ago · -1 km deep · 5 km away
40. 1.59 km SW of Clear Lake Riviera, CaliforniaMon, Sep 19, 1:04 PM PDT · 15718 days ago · -1 km deep · 11 km away
41. 1.813 km ESE of Hidden Valley Lake, CaliforniaMon, Sep 19, 2:26 PM PDT · 15718 days ago · -1 km deep · 31 km away
42. 2.09 km SE of Suisun, CaliforniaMon, Sep 19, 5:17 PM PDT · 15718 days ago · 5 km deep · 99 km away
43. 1.914 km SW of Cloverdale, CaliforniaMon, Sep 19, 10:10 PM PDT · 15717 days ago · 3 km deep · 31 km away
44. 1.97 km W of Cobb, CaliforniaTue, Sep 20, 8:18 AM PDT · 15717 days ago · 0 km deep · 5 km away
45. 2.68 km W of Cobb, CaliforniaTue, Sep 20, 8:26 AM PDT · 15717 days ago · -1 km deep · 5 km away
46. 2.57 km W of Cobb, CaliforniaTue, Sep 20, 8:27 AM PDT · 15717 days ago · -1 km deep · 5 km away
47. 2.19 km W of Cobb, CaliforniaTue, Sep 20, 8:27 AM PDT · 15717 days ago · -1 km deep · 6 km away
48. 1.98 km W of Cobb, CaliforniaTue, Sep 20, 8:29 AM PDT · 15717 days ago · 1 km deep · 5 km away
49. 1.67 km W of Cobb, CaliforniaTue, Sep 20, 10:55 AM PDT · 15717 days ago · 1 km deep · 5 km away
50. 1.66 km S of Cobb, CaliforniaTue, Sep 20, 3:51 PM PDT · 15717 days ago · 0 km deep · 6 km away
51. 1.725 km SE of Covelo, CaliforniaTue, Sep 20, 5:58 PM PDT · 15717 days ago · 5 km deep · 95 km away
52. 1.810 km W of North Lakeport, CaliforniaWed, Sep 21, 9:03 AM PDT · 15716 days ago · 5 km deep · 39 km away
53. 1.513 km N of Upper Lake, CaliforniaWed, Sep 21, 3:00 PM PDT · 15716 days ago · 13 km deep · 57 km away
54. 1.69 km WSW of Cobb, CaliforniaThu, Sep 22, 7:37 AM PDT · 15715 days ago · 2 km deep · 4 km away
55. 1.57 km W of Cobb, CaliforniaThu, Sep 22, 6:55 PM PDT · 15714 days ago · 0 km deep · 5 km away
56. 1.93 km NE of Santa Rosa, CaliforniaThu, Sep 22, 8:30 PM PDT · 15714 days ago · 8 km deep · 37 km away
57. 1.97 km WSW of Cobb, CaliforniaFri, Sep 23, 7:32 AM PDT · 15714 days ago · 2 km deep · 3 km away
58. 1.75 km SW of Cobb, CaliforniaFri, Sep 23, 2:24 PM PDT · 15714 days ago · 4 km deep · 1 km away
59. 2.09 km WSW of Cobb, CaliforniaSat, Sep 24, 6:07 AM PDT · 15713 days ago · 1 km deep · 5 km away
60. 2.87 km WSW of Cobb, CaliforniaSat, Sep 24, 7:45 AM PDT · 15713 days ago · 3 km deep · 3 km away

The first 60 of 173.

Before

1. 1.65 km SW of Cobb, CaliforniaMon, Sep 5, 6:35 AM PDT · 15732 days ago · 0 km deep · 0 km away
2. 1.78 km W of Cobb, CaliforniaSun, Sep 4, 10:02 PM PDT · 15732 days ago · 0 km deep · 5 km away
3. 2.16 km W of Cobb, CaliforniaSun, Sep 4, 7:59 PM PDT · 15732 days ago · 3 km deep · 4 km away
4. 1.56 km W of Cobb, CaliforniaSat, Sep 3, 10:07 PM PDT · 15733 days ago · 3 km deep · 4 km away
5. 1.56 km W of Cobb, CaliforniaSat, Sep 3, 1:23 PM PDT · 15734 days ago · 3 km deep · 4 km away
6. 1.58 km WSW of Cobb, CaliforniaFri, Sep 2, 7:19 PM PDT · 15734 days ago · 1 km deep · 4 km away
7. 2.01 km ENE of Middletown, CaliforniaFri, Sep 2, 4:14 PM PDT · 15735 days ago · 55 km deep · 16 km away
8. 1.57 km W of Cobb, CaliforniaFri, Sep 2, 10:59 AM PDT · 15735 days ago · 3 km deep · 4 km away
9. 1.88 km W of Cobb, CaliforniaThu, Sep 1, 3:30 PM PDT · 15736 days ago · 0 km deep · 5 km away
10. 1.610 km SSW of Comptche, CaliforniaThu, Sep 1, 2:00 PM PDT · 15736 days ago · 3 km deep · 84 km away
11. 1.69 km SW of Clear Lake Riviera, CaliforniaThu, Sep 1, 7:15 AM PDT · 15736 days ago · 9 km deep · 11 km away
12. 1.7Northern CaliforniaWed, Aug 31, 8:37 PM PDT · 15736 days ago · 13 km deep · 81 km away
13. 1.65 km SSW of Cobb, CaliforniaWed, Aug 31, 4:49 PM PDT · 15737 days ago · -1 km deep · 3 km away
14. 1.69 km WSW of Cobb, CaliforniaWed, Aug 31, 3:56 PM PDT · 15737 days ago · 2 km deep · 4 km away
15. 2.012 km WSW of Hopland, CaliforniaWed, Aug 31, 1:11 PM PDT · 15737 days ago · 0 km deep · 44 km away
16. 2.17 km W of Cobb, CaliforniaWed, Aug 31, 3:21 AM PDT · 15737 days ago · 3 km deep · 4 km away
17. 1.92 km ENE of Calpella, CaliforniaWed, Aug 31, 1:48 AM PDT · 15737 days ago · 8 km deep · 61 km away
18. 2.25 km E of Lower Lake, CaliforniaTue, Aug 30, 9:07 PM PDT · 15737 days ago · 5 km deep · 24 km away
19. 1.55 km SSW of Cobb, CaliforniaTue, Aug 30, 5:25 PM PDT · 15738 days ago · 0 km deep · 2 km away
20. 1.54 km S of Cobb, CaliforniaTue, Aug 30, 11:54 AM PDT · 15738 days ago · 1 km deep · 4 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1102012. Read Thu, Oct 1, 2026, 1:00 PM UTC.