M1.8 earthquake 4 km WSW of Cobb, California

Magnitude

1.8 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Sun, Oct 3, 1976, 6:42 PM PDT

UTC

1976-10-04 01:42:17 UTC

Depth

1.2 km (0.8 mi), shallow

Epicenter

38.804° N, 122.768° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.4 km in depth

Magnitude uncertainty

±0.03

Depth from

From location

Station coverage gap

61°

Stations used

25

• Cobb, CaliforniaPopulation 1,778. Forecast4 kmWSW
• Clearlake, CaliforniaPopulation 15,182. Forecast21 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast41 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast665 kmNW

After

1. 1.84 km WSW of Cobb, CaliforniaSun, Oct 3, 6:42 PM PDT · 18263 days ago · 1 km deep · 0 km away
2. 2.08 km W of Cobb, CaliforniaSun, Oct 3, 7:17 PM PDT · 18263 days ago · 0 km deep · 5 km away
3. 1.76 km W of Cobb, CaliforniaSun, Oct 3, 7:46 PM PDT · 18263 days ago · 3 km deep · 4 km away
4. 1.64 km WSW of Cobb, CaliforniaMon, Oct 4, 10:22 PM PDT · 18262 days ago · 1 km deep · 1 km away
5. 1.71 km NE of Clear Lake Riviera, CaliforniaTue, Oct 5, 10:49 AM PDT · 18261 days ago · 0 km deep · 19 km away
6. 2.38 km W of Healdsburg, CaliforniaWed, Oct 6, 3:48 PM PDT · 18260 days ago · 0 km deep · 26 km away
7. 1.77 km W of Cobb, CaliforniaWed, Oct 6, 5:14 PM PDT · 18260 days ago · -1 km deep · 3 km away
8. 1.77 km W of Cobb, CaliforniaThu, Oct 7, 3:25 AM PDT · 18259 days ago · 1 km deep · 4 km away
9. 1.75 km E of Hopland, CaliforniaFri, Oct 8, 4:52 AM PDT · 18258 days ago · 5 km deep · 31 km away
10. 2.54 km SSE of Clear Lake Riviera, CaliforniaFri, Oct 8, 8:11 PM PDT · 18258 days ago · 4 km deep · 14 km away
11. 1.79 km SE of Hopland, CaliforniaFri, Oct 8, 8:43 PM PDT · 18258 days ago · 1 km deep · 26 km away
12. 1.76 km NW of Cobb, CaliforniaSun, Oct 10, 8:13 AM PDT · 18256 days ago · 2 km deep · 7 km away
13. 1.67 km W of Cobb, CaliforniaMon, Oct 11, 4:35 AM PDT · 18255 days ago · 3 km deep · 4 km away
14. 2.56 km W of Cobb, CaliforniaTue, Oct 12, 2:45 AM PDT · 18254 days ago · 4 km deep · 3 km away
15. 1.56 km W of Cobb, CaliforniaTue, Oct 12, 3:07 AM PDT · 18254 days ago · 3 km deep · 4 km away
16. 2.06 km W of Cobb, CaliforniaTue, Oct 12, 6:25 AM PDT · 18254 days ago · 3 km deep · 4 km away
17. 1.67 km WSW of Cobb, CaliforniaTue, Oct 12, 4:56 PM PDT · 18254 days ago · 3 km deep · 3 km away
18. 1.86 km WSW of Cobb, CaliforniaThu, Oct 14, 4:13 AM PDT · 18252 days ago · 3 km deep · 2 km away
19. 2.47 km SSW of Calistoga, CaliforniaFri, Oct 15, 4:06 PM PDT · 18251 days ago · 7 km deep · 33 km away
20. 1.66 km W of Cobb, CaliforniaMon, Oct 18, 7:19 AM PDT · 18248 days ago · 5 km deep · 4 km away
21. 1.66 km W of Cobb, CaliforniaTue, Oct 19, 8:20 PM PDT · 18247 days ago · 3 km deep · 4 km away
22. 1.76 km W of Cobb, CaliforniaTue, Oct 19, 10:38 PM PDT · 18247 days ago · 3 km deep · 3 km away
23. 2.47 km W of Cobb, CaliforniaWed, Oct 20, 4:58 AM PDT · 18246 days ago · 0 km deep · 3 km away
24. 1.67 km W of Cobb, CaliforniaWed, Oct 20, 9:05 PM PDT · 18246 days ago · 3 km deep · 4 km away
25. 1.910 km E of Hidden Valley Lake, CaliforniaThu, Oct 21, 10:57 PM PDT · 18245 days ago · 9 km deep · 28 km away
26. 2.77 km SW of Calistoga, CaliforniaFri, Oct 22, 8:52 AM PDT · 18244 days ago · 6 km deep · 33 km away
27. 1.66 km W of Cobb, CaliforniaSun, Oct 24, 5:56 PM PDT · 18242 days ago · 3 km deep · 3 km away
28. 1.76 km W of Cobb, CaliforniaSun, Oct 24, 10:01 PM PDT · 18242 days ago · 3 km deep · 3 km away
29. 1.67 km SSW of Calistoga, CaliforniaMon, Oct 25, 5:05 AM PDT · 18241 days ago · 6 km deep · 34 km away
30. 2.17 km NE of Hidden Valley Lake, CaliforniaWed, Oct 27, 5:43 AM PDT · 18239 days ago · 5 km deep · 25 km away
31. 2.06 km W of Cobb, CaliforniaWed, Oct 27, 7:34 PM PDT · 18239 days ago · 4 km deep · 3 km away
32. 2.46 km W of Cobb, CaliforniaFri, Oct 29, 11:31 AM PDT · 18237 days ago · 3 km deep · 3 km away
33. 1.67 km W of Cobb, CaliforniaSun, Oct 31, 5:33 AM PST · 18235 days ago · 3 km deep · 4 km away
34. 1.97 km WSW of Cobb, CaliforniaMon, Nov 1, 8:40 AM PST · 18234 days ago · 4 km deep · 3 km away
35. 2.16 km WSW of Cobb, CaliforniaMon, Nov 1, 7:40 PM PST · 18234 days ago · 1 km deep · 2 km away
36. 1.99 km WNW of Cobb, CaliforniaTue, Nov 2, 12:23 AM PST · 18234 days ago · 3 km deep · 8 km away
37. 1.84 km NW of Clearlake, CaliforniaThu, Nov 4, 10:56 PM PST · 18231 days ago · 1 km deep · 22 km away
38. 1.910 km E of Hidden Valley Lake, CaliforniaFri, Nov 5, 2:10 AM PST · 18230 days ago · 10 km deep · 28 km away
39. 1.58 km W of Cobb, CaliforniaFri, Nov 5, 9:45 PM PST · 18230 days ago · -1 km deep · 5 km away
40. 2.57 km W of Cobb, CaliforniaSun, Nov 7, 7:03 PM PST · 18228 days ago · 3 km deep · 4 km away
41. 2.45 km SW of Kenwood, CaliforniaTue, Nov 9, 3:56 AM PST · 18226 days ago · 7 km deep · 50 km away
42. 3.07 km ESE of Willits, CaliforniaWed, Nov 10, 6:33 PM PST · 18225 days ago · 11 km deep · 77 km away
43. 2.515 km SE of Hidden Valley Lake, CaliforniaThu, Nov 11, 8:16 PM PST · 18224 days ago · 4 km deep · 32 km away
44. 2.015 km ESE of Hidden Valley Lake, CaliforniaThu, Nov 11, 8:26 PM PST · 18224 days ago · 6 km deep · 32 km away
45. 2.214 km ESE of Hidden Valley Lake, CaliforniaThu, Nov 11, 10:48 PM PST · 18224 days ago · 6 km deep · 32 km away
46. 1.73 km N of Windsor, CaliforniaFri, Nov 12, 7:50 AM PST · 18223 days ago · 6 km deep · 25 km away
47. 1.76 km W of Cobb, CaliforniaFri, Nov 12, 2:51 PM PST · 18223 days ago · 3 km deep · 3 km away
48. 2.01 km W of Clearlake, CaliforniaFri, Nov 12, 6:16 PM PST · 18223 days ago · 0 km deep · 20 km away
49. 1.62 km WSW of Clearlake, CaliforniaFri, Nov 12, 7:18 PM PST · 18223 days ago · 5 km deep · 19 km away
50. 2.01 km ESE of Clear Lake Riviera, CaliforniaFri, Nov 12, 8:13 PM PST · 18223 days ago · 1 km deep · 17 km away
51. 1.94 km WSW of Cobb, CaliforniaSun, Nov 14, 1:49 AM PST · 18221 days ago · 1 km deep · 1 km away
52. 2.521 km W of Stonyford, CaliforniaSun, Nov 14, 7:48 AM PST · 18221 days ago · 14 km deep · 65 km away
53. 2.123 km W of Stonyford, CaliforniaMon, Nov 15, 12:07 AM PST · 18221 days ago · 1 km deep · 62 km away
54. 2.56 km W of Cobb, CaliforniaMon, Nov 15, 1:21 AM PST · 18220 days ago · 3 km deep · 3 km away
55. 1.97 km WSW of Cobb, CaliforniaTue, Nov 16, 2:50 AM PST · 18219 days ago · 2 km deep · 3 km away
56. 1.66 km WSW of Cobb, CaliforniaTue, Nov 16, 4:41 PM PST · 18219 days ago · 3 km deep · 3 km away
57. 2.26 km W of Cobb, CaliforniaThu, Nov 18, 7:12 AM PST · 18217 days ago · 3 km deep · 3 km away
58. 1.87 km W of Cobb, CaliforniaMon, Nov 22, 2:18 PM PST · 18213 days ago · 3 km deep · 4 km away
59. 1.98 km W of Cobb, CaliforniaTue, Nov 23, 6:32 AM PST · 18212 days ago · 0 km deep · 5 km away
60. 1.84 km WSW of Cobb, CaliforniaWed, Nov 24, 4:06 AM PST · 18211 days ago · 2 km deep · 0 km away

The first 60 of 91.

Before

1. 2.118 km SW of Stonyford, CaliforniaSun, Oct 3, 2:34 PM PDT · 18263 days ago · 9 km deep · 51 km away
2. 1.96 km WSW of Cobb, CaliforniaSat, Oct 2, 10:30 AM PDT · 18264 days ago · 1 km deep · 2 km away
3. 1.95 km WSW of Cobb, CaliforniaWed, Sep 29, 11:52 PM PDT · 18267 days ago · 0 km deep · 2 km away
4. 2.33 km NE of Santa Rosa, CaliforniaWed, Sep 29, 10:21 AM PDT · 18267 days ago · 9 km deep · 39 km away
5. 1.610 km WSW of Cobb, CaliforniaTue, Sep 28, 1:38 PM PDT · 18268 days ago · 3 km deep · 7 km away
6. 1.56 km W of Cobb, CaliforniaTue, Sep 28, 8:00 AM PDT · 18268 days ago · 3 km deep · 3 km away
7. 2.318 km WSW of Stonyford, CaliforniaMon, Sep 27, 10:51 PM PDT · 18269 days ago · 11 km deep · 58 km away
8. 1.87 km W of Cobb, CaliforniaMon, Sep 27, 10:02 PM PDT · 18269 days ago · 3 km deep · 4 km away
9. 1.57 km WSW of Cobb, CaliforniaSun, Sep 26, 11:14 PM PDT · 18270 days ago · 2 km deep · 3 km away
10. 1.94 km WSW of Cobb, CaliforniaSun, Sep 26, 7:00 PM PDT · 18270 days ago · 2 km deep · 0 km away
11. 1.68 km W of Cobb, CaliforniaSun, Sep 26, 5:18 PM PDT · 18270 days ago · -1 km deep · 5 km away
12. 1.67 km WSW of Cobb, CaliforniaSun, Sep 26, 8:31 AM PDT · 18270 days ago · 3 km deep · 3 km away
13. 2.24 km SW of Cobb, CaliforniaSat, Sep 25, 10:45 PM PDT · 18271 days ago · 0 km deep · 1 km away
14. 2.56 km NNE of Penngrove, CaliforniaFri, Sep 24, 2:24 AM PDT · 18272 days ago · 7 km deep · 52 km away
15. 2.46 km W of Cobb, CaliforniaWed, Sep 22, 4:23 PM PDT · 18274 days ago · 3 km deep · 3 km away
16. 1.67 km W of Cobb, CaliforniaTue, Sep 21, 12:12 PM PDT · 18275 days ago · 0 km deep · 4 km away
17. 1.96 km W of Cobb, CaliforniaMon, Sep 20, 11:05 PM PDT · 18276 days ago · 4 km deep · 2 km away
18. 1.66 km W of Cobb, CaliforniaMon, Sep 20, 2:51 AM PDT · 18276 days ago · -1 km deep · 3 km away
19. 2.114 km SE of Sea Ranch, CaliforniaSun, Sep 19, 3:41 AM PDT · 18277 days ago · 7 km deep · 56 km away
20. 3.032 km NNE of Potter Valley, CaliforniaFri, Sep 17, 4:09 AM PDT · 18279 days ago · 15 km deep · 86 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1031772. Read Sun, Oct 4, 2026, 8:37 PM UTC.