M1.7 earthquake 7 km WSW of Cobb, California

Magnitude

1.7 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Sun, Jul 3, 1983, 2:31 AM PDT

UTC

1983-07-03 09:31:11 UTC

Depth

0.8 km (0.5 mi), shallow

Epicenter

38.804° N, 122.805° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 0.4 km in depth

Magnitude uncertainty

±0.16

Depth from

From location

Station coverage gap

77°

Stations used

13

• Cobb, CaliforniaPopulation 1,778. Forecast7 kmWSW
• Healdsburg, CaliforniaPopulation 11,742. Forecast22 kmNNE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast41 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast667 kmNW

After

1. 1.54 km NW of Redwood Valley, CaliforniaSun, Jul 3, 6:13 AM PDT · 15796 days ago · 4 km deep · 67 km away
2. 2.07 km W of Cobb, CaliforniaSun, Jul 3, 12:09 PM PDT · 15796 days ago · 1 km deep · 1 km away
3. 1.78 km NE of Hopland, CaliforniaMon, Jul 4, 12:41 AM PDT · 15795 days ago · 5 km deep · 32 km away
4. 2.18 km NE of Hopland, CaliforniaMon, Jul 4, 12:41 AM PDT · 15795 days ago · 4 km deep · 33 km away
5. 1.56 km NE of Rohnert Park, CaliforniaMon, Jul 4, 3:52 AM PDT · 15795 days ago · 0 km deep · 49 km away
6. 2.01 km SSE of Green Valley, CaliforniaMon, Jul 4, 7:49 AM PDT · 15795 days ago · 11 km deep · 84 km away
7. 2.07 km W of Cobb, CaliforniaMon, Jul 4, 1:33 PM PDT · 15795 days ago · 3 km deep · 2 km away
8. 2.37 km E of Clearlake Oaks, CaliforniaMon, Jul 4, 7:55 PM PDT · 15795 days ago · -1 km deep · 32 km away
9. 2.07 km E of Clearlake Oaks, CaliforniaMon, Jul 4, 7:56 PM PDT · 15795 days ago · -1 km deep · 32 km away
10. 2.16 km W of Cobb, CaliforniaTue, Jul 5, 1:44 AM PDT · 15794 days ago · 1 km deep · 1 km away
11. 2.27 km WSW of Cobb, CaliforniaTue, Jul 5, 1:46 PM PDT · 15794 days ago · 1 km deep · 0 km away
12. 1.618 km NNE of Upper Lake, CaliforniaTue, Jul 5, 11:50 PM PDT · 15793 days ago · -1 km deep · 56 km away
13. 2.418 km NE of Upper Lake, CaliforniaWed, Jul 6, 1:58 AM PDT · 15793 days ago · 6 km deep · 55 km away
14. 1.618 km NE of Upper Lake, CaliforniaWed, Jul 6, 2:46 AM PDT · 15793 days ago · 0 km deep · 55 km away
15. 1.67 km WSW of Cobb, CaliforniaWed, Jul 6, 12:35 PM PDT · 15793 days ago · 3 km deep · 2 km away
16. 1.68 km WSW of Cobb, CaliforniaWed, Jul 6, 4:14 PM PDT · 15793 days ago · 0 km deep · 1 km away
17. 1.88 km W of Cobb, CaliforniaWed, Jul 6, 5:29 PM PDT · 15793 days ago · 1 km deep · 2 km away
18. 1.67 km S of Cobb, CaliforniaWed, Jul 6, 6:14 PM PDT · 15793 days ago · -1 km deep · 10 km away
19. 1.9Northern CaliforniaThu, Jul 7, 3:50 AM PDT · 15792 days ago · 2 km deep · 1 km away
20. 2.09 km WSW of Cobb, CaliforniaFri, Jul 8, 11:02 PM PDT · 15790 days ago · 1 km deep · 2 km away
21. 1.5Northern CaliforniaSat, Jul 9, 2:08 PM PDT · 15790 days ago · 1 km deep · 2 km away
22. 2.316 km ENE of Potter Valley, CaliforniaSat, Jul 9, 3:34 PM PDT · 15790 days ago · 8 km deep · 66 km away
23. 2.37 km W of Cobb, CaliforniaSat, Jul 9, 6:29 PM PDT · 15790 days ago · 3 km deep · 2 km away
24. 1.57 km WSW of Cobb, CaliforniaSun, Jul 10, 4:55 AM PDT · 15789 days ago · 2 km deep · 0 km away
25. 1.68 km W of Cobb, CaliforniaSun, Jul 10, 2:46 PM PDT · 15789 days ago · 1 km deep · 3 km away
26. 1.87 km W of Cobb, CaliforniaMon, Jul 11, 10:58 AM PDT · 15788 days ago · 3 km deep · 1 km away
27. 2.17 km N of Cobb, CaliforniaMon, Jul 11, 4:09 PM PDT · 15788 days ago · 2 km deep · 11 km away
28. 1.77 km S of Cobb, CaliforniaMon, Jul 11, 4:40 PM PDT · 15788 days ago · -1 km deep · 10 km away
29. 1.67 km WSW of Cobb, CaliforniaMon, Jul 11, 9:59 PM PDT · 15787 days ago · 0 km deep · 0 km away
30. 1.83 km N of Larkfield-Wikiup, CaliforniaTue, Jul 12, 2:29 AM PDT · 15787 days ago · 7 km deep · 29 km away
31. 2.222 km W of Elk Creek, CaliforniaTue, Jul 12, 7:49 AM PDT · 15787 days ago · 4 km deep · 93 km away
32. 1.522 km WNW of Elk Creek, CaliforniaTue, Jul 12, 7:50 AM PDT · 15787 days ago · 4 km deep · 94 km away
33. 1.54 km NW of Redwood Valley, CaliforniaTue, Jul 12, 10:00 AM PDT · 15787 days ago · 6 km deep · 67 km away
34. 1.86 km W of Cobb, CaliforniaTue, Jul 12, 10:59 AM PDT · 15787 days ago · 1 km deep · 1 km away
35. 2.27 km W of Cobb, CaliforniaTue, Jul 12, 5:38 PM PDT · 15787 days ago · 2 km deep · 1 km away
36. 1.816 km ENE of Potter Valley, CaliforniaTue, Jul 12, 10:12 PM PDT · 15786 days ago · 10 km deep · 66 km away
37. 1.96 km WSW of Cobb, CaliforniaWed, Jul 13, 3:09 AM PDT · 15786 days ago · 1 km deep · 1 km away
38. 1.56 km NE of Rohnert Park, CaliforniaWed, Jul 13, 5:05 AM PDT · 15786 days ago · 4 km deep · 50 km away
39. 1.611 km ENE of Hidden Valley Lake, CaliforniaWed, Jul 13, 9:26 PM PDT · 15785 days ago · 8 km deep · 32 km away
40. 2.020 km NNE of Upper Lake, CaliforniaThu, Jul 14, 8:00 AM PDT · 15785 days ago · 5 km deep · 59 km away
41. 1.818 km ENE of Potter Valley, CaliforniaFri, Jul 15, 3:44 AM PDT · 15784 days ago · 7 km deep · 64 km away
42. 3.62 km SSE of Point Arena, CaliforniaFri, Jul 15, 12:00 PM PDT · 15784 days ago · 10 km deep · 76 km away
43. 1.818 km ENE of Potter Valley, CaliforniaFri, Jul 15, 1:26 PM PDT · 15784 days ago · 5 km deep · 64 km away
44. 1.519 km ENE of Potter Valley, CaliforniaFri, Jul 15, 3:12 PM PDT · 15784 days ago · 9 km deep · 65 km away
45. 1.75 km WSW of Moskowite Corner, CaliforniaFri, Jul 15, 8:06 PM PDT · 15784 days ago · 14 km deep · 65 km away
46. 2.35 km ESE of Manchester, CaliforniaFri, Jul 15, 9:47 PM PDT · 15783 days ago · 2 km deep · 73 km away
47. 1.818 km ENE of Potter Valley, CaliforniaSat, Jul 16, 5:16 AM PDT · 15783 days ago · 0 km deep · 64 km away
48. 1.54 km SSE of Kelseyville, CaliforniaSat, Jul 16, 9:02 AM PDT · 15783 days ago · 2 km deep · 15 km away
49. 1.62 km SE of Redwood Valley, CaliforniaSat, Jul 16, 3:43 PM PDT · 15783 days ago · 6 km deep · 60 km away
50. 2.77 km W of Cobb, CaliforniaSun, Jul 17, 5:15 PM PDT · 15782 days ago · 3 km deep · 2 km away
51. 1.64 km WSW of Cobb, CaliforniaMon, Jul 18, 1:31 AM PDT · 15781 days ago · 4 km deep · 3 km away
52. 1.63 km ESE of Calpella, CaliforniaMon, Jul 18, 12:31 PM PDT · 15781 days ago · 4 km deep · 56 km away
53. 1.92 km S of Geyserville, CaliforniaMon, Jul 18, 7:16 PM PDT · 15781 days ago · 4 km deep · 16 km away
54. 1.58 km WSW of Cobb, CaliforniaTue, Jul 19, 12:03 AM PDT · 15780 days ago · 4 km deep · 1 km away
55. 1.65 km S of Cobb, CaliforniaTue, Jul 19, 9:24 PM PDT · 15779 days ago · 1 km deep · 7 km away
56. 1.611 km SE of Hidden Valley Lake, CaliforniaWed, Jul 20, 10:02 AM PDT · 15779 days ago · 2 km deep · 31 km away
57. 1.63 km WSW of Calpella, CaliforniaWed, Jul 20, 5:31 PM PDT · 15779 days ago · 8 km deep · 60 km away
58. 1.8Northern CaliforniaThu, Jul 21, 4:42 AM PDT · 15778 days ago · 3 km deep · 1 km away
59. 1.88 km S of Cobb, CaliforniaThu, Jul 21, 4:37 PM PDT · 15778 days ago · 0 km deep · 10 km away
60. 1.95 km S of Cobb, CaliforniaThu, Jul 21, 7:19 PM PDT · 15778 days ago · -1 km deep · 9 km away

The first 60 of 184.

Before

1. 1.66 km WSW of Cobb, CaliforniaSat, Jul 2, 5:07 AM PDT · 15797 days ago · 0 km deep · 2 km away
2. 1.63 km SSW of Cobb, CaliforniaFri, Jul 1, 10:51 PM PDT · 15797 days ago · 0 km deep · 6 km away
3. 2.34 km S of Cobb, CaliforniaFri, Jul 1, 10:50 PM PDT · 15797 days ago · 0 km deep · 8 km away
4. 1.67 km NW of Cobb, CaliforniaFri, Jul 1, 8:12 AM PDT · 15798 days ago · -1 km deep · 7 km away
5. 2.18 km WSW of Cobb, CaliforniaFri, Jul 1, 5:09 AM PDT · 15798 days ago · 0 km deep · 1 km away
6. 2.36 km W of Cobb, CaliforniaFri, Jul 1, 12:55 AM PDT · 15798 days ago · 3 km deep · 2 km away
7. 1.713 km ESE of Hidden Valley Lake, CaliforniaThu, Jun 30, 5:35 PM PDT · 15799 days ago · 2 km deep · 34 km away
8. 2.49 km WSW of Cobb, CaliforniaThu, Jun 30, 5:29 PM PDT · 15799 days ago · 2 km deep · 2 km away
9. 1.65 km SSE of Clear Lake Riviera, CaliforniaThu, Jun 30, 6:52 AM PDT · 15799 days ago · 4 km deep · 15 km away
10. 1.77 km WSW of Cobb, CaliforniaTue, Jun 28, 9:09 PM PDT · 15800 days ago · 3 km deep · 1 km away
11. 1.56 km ENE of Healdsburg, CaliforniaTue, Jun 28, 1:10 PM PDT · 15801 days ago · 3 km deep · 20 km away
12. 1.73 km W of Clear Lake Riviera, CaliforniaTue, Jun 28, 7:55 AM PDT · 15801 days ago · 5 km deep · 17 km away
13. 1.78 km WSW of Cobb, CaliforniaTue, Jun 28, 1:43 AM PDT · 15801 days ago · 4 km deep · 2 km away
14. 2.57 km W of Cobb, CaliforniaMon, Jun 27, 9:28 PM PDT · 15801 days ago · 0 km deep · 1 km away
15. 2.16 km ENE of Santa Rosa, CaliforniaMon, Jun 27, 12:36 AM PDT · 15802 days ago · 10 km deep · 41 km away
16. 1.84 km W of Cobb, CaliforniaMon, Jun 27, 12:02 AM PDT · 15802 days ago · 0 km deep · 3 km away
17. 1.84 km E of Boonville, CaliforniaSun, Jun 26, 9:28 PM PDT · 15802 days ago · 7 km deep · 50 km away
18. 1.87 km WSW of Cobb, CaliforniaSun, Jun 26, 5:07 PM PDT · 15803 days ago · 2 km deep · 0 km away
19. 1.85 km N of Cobb, CaliforniaSun, Jun 26, 4:55 PM PDT · 15803 days ago · 0 km deep · 11 km away
20. 2.67 km WSW of Cobb, CaliforniaSun, Jun 26, 1:52 PM PDT · 15803 days ago · 1 km deep · 1 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1097952. Read Thu, Oct 1, 2026, 3:07 PM UTC.