M1.5 earthquake 7 km W of Cobb, California

Magnitude

1.5 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Fri, Dec 31, 1976, 5:46 AM PST

UTC

1976-12-31 13:46:32 UTC

Depth

-0.9 km (-0.6 mi), shallow

Epicenter

38.819° N, 122.808° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.5 km horizontally, 1.4 km in depth

Magnitude uncertainty

±0.12

Depth from

From location

Station coverage gap

82°

Stations used

13

• Cobb, CaliforniaPopulation 1,778. Forecast7 kmW
• Clearlake, CaliforniaPopulation 15,182. Forecast22 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast43 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast669 kmNW

After

1. 1.95 km E of Clearlake, CaliforniaFri, Dec 31, 8:06 AM PST · 18172 days ago · 6 km deep · 26 km away
2. 2.06 km W of Cobb, CaliforniaFri, Dec 31, 6:15 PM PST · 18172 days ago · -1 km deep · 1 km away
3. 2.09 km SE of Talmage, CaliforniaFri, Dec 31, 10:09 PM PST · 18172 days ago · 3 km deep · 37 km away
4. 1.68 km W of Cobb, CaliforniaFri, Dec 31, 11:26 PM PST · 18172 days ago · 6 km deep · 1 km away
5. 1.87 km W of Cobb, CaliforniaSat, Jan 1, 9:04 PM PST · 18171 days ago · 3 km deep · 1 km away
6. 1.68 km W of Cobb, CaliforniaSun, Jan 2, 3:35 PM PST · 18170 days ago · 0 km deep · 1 km away
7. 1.69 km NE of Hopland, CaliforniaSun, Jan 2, 4:55 PM PST · 18170 days ago · 7 km deep · 31 km away
8. 1.96 km WSW of Cobb, CaliforniaTue, Jan 4, 10:14 PM PST · 18168 days ago · 4 km deep · 1 km away
9. 1.87 km W of Cobb, CaliforniaWed, Jan 5, 9:40 PM PST · 18167 days ago · 3 km deep · 0 km away
10. 1.89 km E of Hidden Valley Lake, CaliforniaThu, Jan 6, 12:17 AM PST · 18167 days ago · 7 km deep · 31 km away
11. 1.87 km WSW of Cobb, CaliforniaThu, Jan 6, 6:36 AM PST · 18166 days ago · -1 km deep · 2 km away
12. 1.86 km W of Cobb, CaliforniaThu, Jan 6, 2:19 PM PST · 18166 days ago · 4 km deep · 1 km away
13. 1.93 km ESE of Moskowite Corner, CaliforniaThu, Jan 6, 10:18 PM PST · 18166 days ago · 16 km deep · 72 km away
14. 2.54 km S of Moskowite Corner, CaliforniaThu, Jan 6, 10:19 PM PST · 18166 days ago · 9 km deep · 70 km away
15. 2.04 km SSW of Moskowite Corner, CaliforniaThu, Jan 6, 10:25 PM PST · 18166 days ago · 12 km deep · 70 km away
16. 1.66 km W of Cobb, CaliforniaFri, Jan 7, 8:03 AM PST · 18165 days ago · 3 km deep · 1 km away
17. 2.110 km W of Cobb, CaliforniaFri, Jan 7, 1:48 PM PST · 18165 days ago · 1 km deep · 4 km away
18. 2.07 km NE of Hopland, CaliforniaSun, Jan 9, 2:55 AM PST · 18164 days ago · 3 km deep · 31 km away
19. 2.18 km WSW of Cobb, CaliforniaSun, Jan 9, 2:39 PM PST · 18163 days ago · 0 km deep · 2 km away
20. 1.98 km E of Hopland, CaliforniaSun, Jan 9, 8:22 PM PST · 18163 days ago · 5 km deep · 25 km away
21. 1.78 km W of Cobb, CaliforniaMon, Jan 10, 10:05 PM PST · 18162 days ago · 0 km deep · 2 km away
22. 2.80 km SSE of Larkfield-Wikiup, CaliforniaTue, Jan 11, 4:04 PM PST · 18161 days ago · 5 km deep · 34 km away
23. 2.26 km W of Cobb, CaliforniaTue, Jan 11, 11:53 PM PST · 18161 days ago · 3 km deep · 1 km away
24. 1.86 km W of Cobb, CaliforniaWed, Jan 12, 2:54 AM PST · 18161 days ago · 3 km deep · 1 km away
25. 2.66 km W of Cobb, CaliforniaThu, Jan 13, 11:49 PM PST · 18159 days ago · 1 km deep · 1 km away
26. 1.82 km NNE of Clearlake, CaliforniaFri, Jan 14, 12:38 AM PST · 18159 days ago · 0 km deep · 25 km away
27. 1.75 km ESE of Lucerne, CaliforniaFri, Jan 14, 5:35 AM PST · 18158 days ago · 1 km deep · 30 km away
28. 1.87 km W of Cobb, CaliforniaSat, Jan 15, 6:23 PM PST · 18157 days ago · 4 km deep · 1 km away
29. 1.55 km N of Cobb, CaliforniaSun, Jan 16, 10:25 AM PST · 18156 days ago · 1 km deep · 10 km away
30. 2.220 km NE of Upper Lake, CaliforniaSun, Jan 16, 2:53 PM PST · 18156 days ago · 8 km deep · 55 km away
31. 1.54 km WNW of Lower Lake, CaliforniaMon, Jan 17, 4:48 AM PST · 18155 days ago · 2 km deep · 18 km away
32. 1.98 km S of Calistoga, CaliforniaMon, Jan 17, 2:45 PM PST · 18155 days ago · 7 km deep · 41 km away
33. 1.54 km WSW of Cobb, CaliforniaTue, Jan 18, 9:17 AM PST · 18154 days ago · 1 km deep · 3 km away
34. 1.84 km WSW of Cobb, CaliforniaTue, Jan 18, 9:50 AM PST · 18154 days ago · 1 km deep · 4 km away
35. 2.320 km WSW of Stonyford, CaliforniaTue, Jan 18, 1:11 PM PST · 18154 days ago · 0 km deep · 57 km away
36. 1.74 km WSW of Cobb, CaliforniaTue, Jan 18, 2:14 PM PST · 18154 days ago · 1 km deep · 4 km away
37. 1.67 km W of Cobb, CaliforniaTue, Jan 18, 8:35 PM PST · 18154 days ago · 3 km deep · 0 km away
38. 2.43 km NNW of Larkfield-Wikiup, CaliforniaWed, Jan 19, 4:30 AM PST · 18153 days ago · 7 km deep · 31 km away
39. 2.23 km NNW of Larkfield-Wikiup, CaliforniaWed, Jan 19, 5:33 AM PST · 18153 days ago · 7 km deep · 31 km away
40. 1.63 km N of Larkfield-Wikiup, CaliforniaWed, Jan 19, 11:52 PM PST · 18153 days ago · 6 km deep · 31 km away
41. 1.57 km WSW of Cobb, CaliforniaThu, Jan 20, 9:48 AM PST · 18152 days ago · 0 km deep · 1 km away
42. 1.57 km WSW of Cobb, CaliforniaThu, Jan 20, 7:10 PM PST · 18152 days ago · 3 km deep · 3 km away
43. 2.17 km W of Cobb, CaliforniaFri, Jan 21, 6:38 AM PST · 18151 days ago · 3 km deep · 0 km away
44. 1.917 km NNE of Angwin, CaliforniaMon, Jan 24, 5:43 AM PST · 18148 days ago · 10 km deep · 39 km away
45. 2.12 km ENE of Santa Rosa, CaliforniaWed, Jan 26, 8:43 PM PST · 18146 days ago · 9 km deep · 42 km away
46. 1.96 km WSW of Cobb, CaliforniaThu, Jan 27, 1:00 PM PST · 18145 days ago · 1 km deep · 2 km away
47. 2.77 km WSW of Cobb, CaliforniaThu, Jan 27, 6:03 PM PST · 18145 days ago · 4 km deep · 2 km away
48. 1.77 km WSW of Cobb, CaliforniaFri, Jan 28, 11:53 PM PST · 18144 days ago · 2 km deep · 2 km away
49. 1.90 km SSE of Lakeport, CaliforniaSun, Jan 30, 5:22 AM PST · 18142 days ago · 1 km deep · 26 km away
50. 1.610 km WSW of Cobb, CaliforniaTue, Feb 1, 6:20 PM PST · 18140 days ago · 1 km deep · 4 km away
51. 2.03 km WSW of Cobb, CaliforniaWed, Feb 2, 9:27 AM PST · 18139 days ago · 2 km deep · 4 km away
52. 1.95 km SW of Clearlake, CaliforniaWed, Feb 9, 2:13 AM PST · 18133 days ago · 2 km deep · 17 km away
53. 2.27 km W of Cobb, CaliforniaWed, Feb 9, 5:39 PM PST · 18132 days ago · 3 km deep · 1 km away
54. 2.217 km NE of Nice, CaliforniaWed, Feb 9, 8:09 PM PST · 18132 days ago · 9 km deep · 47 km away
55. 2.44 km WSW of Cobb, CaliforniaWed, Feb 9, 8:38 PM PST · 18132 days ago · 1 km deep · 4 km away
56. 2.113 km NNE of Angwin, CaliforniaWed, Feb 9, 10:26 PM PST · 18132 days ago · 12 km deep · 40 km away
57. 3.07 km WSW of Cobb, CaliforniaThu, Feb 10, 11:18 AM PST · 18131 days ago · 2 km deep · 2 km away
58. 2.39 km ESE of Black Point-Green Point, CaliforniaSat, Feb 12, 6:50 PM PST · 18129 days ago · 12 km deep · 88 km away
59. 1.88 km W of Cobb, CaliforniaSun, Feb 13, 8:04 AM PST · 18128 days ago · 0 km deep · 1 km away
60. 2.24 km ESE of Santa Rosa, CaliforniaMon, Feb 14, 2:37 AM PST · 18128 days ago · 10 km deep · 45 km away

The first 60 of 82.

Before

1. 1.75 km W of Cobb, CaliforniaThu, Dec 30, 3:58 PM PST · 18173 days ago · 0 km deep · 2 km away
2. 2.04 km WSW of Cobb, CaliforniaThu, Dec 30, 12:37 AM PST · 18174 days ago · 3 km deep · 3 km away
3. 2.43 km SSE of Moskowite Corner, CaliforniaWed, Dec 29, 5:02 PM PST · 18174 days ago · 12 km deep · 71 km away
4. 2.05 km NNE of Penngrove, CaliforniaWed, Dec 29, 9:31 AM PST · 18174 days ago · 5 km deep · 55 km away
5. 2.46 km NNE of Penngrove, CaliforniaWed, Dec 29, 9:08 AM PST · 18174 days ago · 7 km deep · 55 km away
6. 1.67 km SW of Calistoga, CaliforniaTue, Dec 28, 5:13 PM PST · 18175 days ago · 5 km deep · 36 km away
7. 1.8Northern CaliforniaTue, Dec 28, 3:36 AM PST · 18175 days ago · 0 km deep · 2 km away
8. 2.59 km W of Cobb, CaliforniaSun, Dec 26, 6:54 PM PST · 18177 days ago · 0 km deep · 2 km away
9. 1.90 km NNE of Larkfield-Wikiup, CaliforniaSun, Dec 26, 5:18 AM PST · 18177 days ago · 4 km deep · 34 km away
10. 1.816 km SW of Stonyford, CaliforniaSat, Dec 25, 7:10 PM PST · 18178 days ago · 1 km deep · 53 km away
11. 2.218 km NE of Nice, CaliforniaSat, Dec 25, 7:09 PM PST · 18178 days ago · 3 km deep · 49 km away
12. 2.96 km W of Cobb, CaliforniaThu, Dec 23, 11:10 AM PST · 18180 days ago · 4 km deep · 1 km away
13. 3.48 km WSW of Cobb, CaliforniaWed, Dec 22, 5:23 PM PST · 18181 days ago · 4 km deep · 2 km away
14. 1.6Northern CaliforniaWed, Dec 22, 1:41 PM PST · 18181 days ago · 3 km deep · 1 km away
15. 2.76 km W of Cobb, CaliforniaWed, Dec 22, 1:12 PM PST · 18181 days ago · 3 km deep · 1 km away
16. 1.510 km W of Cobb, CaliforniaWed, Dec 22, 9:26 AM PST · 18181 days ago · 1 km deep · 3 km away
17. 2.1Northern CaliforniaWed, Dec 22, 2:24 AM PST · 18182 days ago · 9 km deep · 34 km away
18. 1.86 km W of Cobb, CaliforniaTue, Dec 21, 11:26 PM PST · 18182 days ago · 0 km deep · 1 km away
19. 1.96 km W of Cobb, CaliforniaTue, Dec 21, 5:49 PM PST · 18182 days ago · 0 km deep · 2 km away
20. 3.5Northern CaliforniaTue, Dec 21, 4:42 PM PST · 18182 days ago · 1 km deep · 2 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1033040. Read Fri, Oct 2, 2026, 10:46 PM UTC.