M1.7 earthquake 7 km W of Cobb, California

Magnitude

1.7 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Sat, Dec 9, 1978, 9:58 PM PST

UTC

1978-12-10 05:58:00 UTC

Depth

-1.0 km (-0.6 mi), shallow

Epicenter

38.826° N, 122.809° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.5 km horizontally, 1.9 km in depth

Magnitude uncertainty

±0.06

Depth from

From location

Station coverage gap

140°

Stations used

8

• Cobb, CaliforniaPopulation 1,778. Forecast7 kmW
• Clearlake, CaliforniaPopulation 15,182. Forecast22 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast44 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast669 kmNW

After

1. 2.110 km SE of Sonoma, CaliforniaMon, Dec 11, 3:46 AM PST · 17463 days ago · 7 km deep · 77 km away
2. 1.810 km SE of Hopland, CaliforniaTue, Dec 12, 6:55 PM PST · 17461 days ago · 2 km deep · 21 km away
3. 1.912 km ESE of Hidden Valley Lake, CaliforniaWed, Dec 13, 10:06 AM PST · 17461 days ago · 8 km deep · 34 km away
4. 3.26 km W of Cobb, CaliforniaThu, Dec 14, 7:01 PM PST · 17459 days ago · 4 km deep · 2 km away
5. 1.56 km W of Cobb, CaliforniaThu, Dec 14, 10:07 PM PST · 17459 days ago · 3 km deep · 1 km away
6. 1.611 km ESE of Willits, CaliforniaFri, Dec 15, 8:28 AM PST · 17459 days ago · 4 km deep · 71 km away
7. 2.33 km SE of Calpella, CaliforniaMon, Dec 18, 1:21 AM PST · 17456 days ago · 6 km deep · 54 km away
8. 1.75 km W of Cobb, CaliforniaMon, Dec 18, 5:45 PM PST · 17455 days ago · 0 km deep · 2 km away
9. 1.67 km WSW of Cobb, CaliforniaTue, Dec 19, 7:52 AM PST · 17455 days ago · 1 km deep · 2 km away
10. 2.411 km ESE of Hidden Valley Lake, CaliforniaTue, Dec 19, 11:42 PM PST · 17454 days ago · 10 km deep · 33 km away
11. 1.99 km ENE of Brooktrails, CaliforniaThu, Dec 21, 8:18 PM PST · 17452 days ago · 9 km deep · 83 km away
12. 2.519 km NNE of Upper Lake, CaliforniaFri, Dec 22, 2:19 PM PST · 17451 days ago · 7 km deep · 54 km away
13. 1.917 km SW of Hopland, CaliforniaFri, Dec 22, 7:48 PM PST · 17451 days ago · 1 km deep · 40 km away
14. 1.98 km WSW of Cobb, CaliforniaFri, Dec 22, 9:15 PM PST · 17451 days ago · 1 km deep · 3 km away
15. 1.610 km ESE of Hidden Valley Lake, CaliforniaSun, Dec 24, 3:18 PM PST · 17449 days ago · 6 km deep · 32 km away
16. 1.68 km WSW of Cobb, CaliforniaSun, Dec 24, 10:20 PM PST · 17449 days ago · 1 km deep · 2 km away
17. 2.16 km E of Willits, CaliforniaMon, Dec 25, 10:44 AM PST · 17449 days ago · 1 km deep · 78 km away
18. 1.67 km WSW of Cobb, CaliforniaTue, Dec 26, 2:49 PM PST · 17447 days ago · 2 km deep · 3 km away
19. 1.76 km W of Cobb, CaliforniaTue, Dec 26, 5:14 PM PST · 17447 days ago · 1 km deep · 1 km away
20. 2.010 km SSE of Willits, CaliforniaThu, Dec 28, 10:28 PM PST · 17445 days ago · 4 km deep · 70 km away
21. 1.95 km ESE of Black Point-Green Point, CaliforniaFri, Dec 29, 1:19 AM PST · 17445 days ago · 5 km deep · 86 km away
22. 1.98 km WSW of Cobb, CaliforniaFri, Dec 29, 11:25 AM PST · 17445 days ago · 1 km deep · 2 km away
23. 1.96 km W of Cobb, CaliforniaFri, Dec 29, 12:33 PM PST · 17444 days ago · 3 km deep · 1 km away
24. 2.23 km W of Deer Park, CaliforniaSat, Dec 30, 1:14 AM PST · 17444 days ago · 8 km deep · 41 km away
25. 2.07 km WSW of Cobb, CaliforniaMon, Jan 1, 8:19 AM PST · 17442 days ago · 1 km deep · 3 km away
26. 1.67 km WSW of Cobb, CaliforniaWed, Jan 3, 3:39 AM PST · 17440 days ago · 3 km deep · 3 km away
27. 1.51 km WSW of Moskowite Corner, CaliforniaWed, Jan 3, 8:45 AM PST · 17440 days ago · 12 km deep · 68 km away
28. 1.927 km SE of Covelo, CaliforniaSun, Jan 7, 10:42 PM PST · 17435 days ago · 0 km deep · 88 km away
29. 1.67 km W of Healdsburg, CaliforniaMon, Jan 8, 12:11 AM PST · 17435 days ago · 1 km deep · 26 km away
30. 2.45 km E of Black Point-Green Point, CaliforniaTue, Jan 9, 8:57 PM PST · 17433 days ago · 12 km deep · 85 km away
31. 1.66 km W of Cobb, CaliforniaWed, Jan 10, 12:54 PM PST · 17432 days ago · 4 km deep · 1 km away
32. 1.87 km W of Cobb, CaliforniaFri, Jan 12, 10:11 PM PST · 17430 days ago · 3 km deep · 1 km away
33. 1.76 km W of Cobb, CaliforniaFri, Jan 12, 11:38 PM PST · 17430 days ago · 4 km deep · 1 km away
34. 2.52 km SSW of Monument Hills, CaliforniaWed, Jan 17, 10:19 AM PST · 17426 days ago · 10 km deep · 82 km away
35. 2.76 km W of Cobb, CaliforniaThu, Jan 18, 9:54 PM PST · 17424 days ago · 0 km deep · 1 km away
36. 1.76 km W of Cobb, CaliforniaThu, Jan 18, 11:43 PM PST · 17424 days ago · 0 km deep · 1 km away
37. 1.58 km WSW of Cobb, CaliforniaFri, Jan 19, 4:11 AM PST · 17424 days ago · 1 km deep · 2 km away
38. 2.99 km WNW of Princeton, CaliforniaSun, Jan 21, 12:28 PM PST · 17421 days ago · 15 km deep · 90 km away
39. 1.67 km WSW of Cobb, CaliforniaMon, Jan 22, 9:27 PM PST · 17420 days ago · 2 km deep · 2 km away
40. 1.65 km W of Cobb, CaliforniaTue, Jan 23, 4:34 PM PST · 17419 days ago · 1 km deep · 2 km away
41. 1.87 km W of Cobb, CaliforniaWed, Jan 24, 3:32 AM PST · 17419 days ago · 4 km deep · 1 km away
42. 2.04 km NNW of Winters, CaliforniaWed, Jan 24, 7:26 PM PST · 17418 days ago · 2 km deep · 77 km away
43. 1.58 km ENE of Santa Rosa, CaliforniaThu, Jan 25, 11:37 PM PST · 17417 days ago · 0 km deep · 42 km away
44. 2.54 km SSE of Dunnigan, CaliforniaFri, Jan 26, 1:40 PM PST · 17416 days ago · 8 km deep · 74 km away
45. 2.08 km E of Willits, CaliforniaSat, Jan 27, 9:04 AM PST · 17416 days ago · 7 km deep · 75 km away
46. 1.68 km W of Cobb, CaliforniaSun, Jan 28, 12:12 PM PST · 17414 days ago · 1 km deep · 1 km away
47. 2.07 km W of Cobb, CaliforniaMon, Jan 29, 3:02 AM PST · 17414 days ago · 3 km deep · 1 km away
48. 3.08 km E of Willits, CaliforniaMon, Jan 29, 5:27 PM PST · 17413 days ago · 8 km deep · 75 km away
49. 2.68 km E of Willits, CaliforniaMon, Jan 29, 5:28 PM PST · 17413 days ago · 9 km deep · 75 km away
50. 2.06 km W of Cobb, CaliforniaMon, Jan 29, 7:14 PM PST · 17413 days ago · 4 km deep · 1 km away
51. 1.95 km ESE of Healdsburg, CaliforniaMon, Jan 29, 9:52 PM PST · 17413 days ago · 6 km deep · 25 km away
52. 1.67 km W of Cobb, CaliforniaTue, Jan 30, 7:27 AM PST · 17413 days ago · -1 km deep · 1 km away
53. 2.54 km WSW of Cobb, CaliforniaTue, Jan 30, 9:52 PM PST · 17412 days ago · 2 km deep · 4 km away
54. 1.52 km ENE of Clear Lake Riviera, CaliforniaTue, Jan 30, 10:49 PM PST · 17412 days ago · 3 km deep · 18 km away
55. 2.07 km NE of Inverness, CaliforniaFri, Feb 2, 5:22 PM PST · 17409 days ago · 0 km deep · 76 km away
56. 2.09 km S of Moskowite Corner, CaliforniaFri, Feb 2, 7:46 PM PST · 17409 days ago · 7 km deep · 74 km away
57. 2.57 km W of Cobb, CaliforniaSat, Feb 3, 11:49 AM PST · 17408 days ago · 4 km deep · 0 km away
58. 2.410 km SE of Dunnigan, CaliforniaSun, Feb 4, 7:28 AM PST · 17408 days ago · 9 km deep · 79 km away
59. 2.78 km WNW of Princeton, CaliforniaTue, Feb 6, 12:28 AM PST · 17406 days ago · 16 km deep · 91 km away

Before

1. 2.0Northern CaliforniaSat, Dec 9, 9:56 PM PST · 17464 days ago · 8 km deep · 34 km away
2. 1.7Northern CaliforniaSat, Dec 9, 8:07 AM PST · 17465 days ago · 18 km deep · 21 km away
3. 3.46 km WSW of Cobb, CaliforniaSat, Dec 9, 8:02 AM PST · 17465 days ago · 0 km deep · 3 km away
4. 1.96 km W of Cobb, CaliforniaFri, Dec 8, 9:58 PM PST · 17465 days ago · 0 km deep · 1 km away
5. 1.64 km E of Saint Helena, CaliforniaFri, Dec 8, 11:59 AM PST · 17465 days ago · 5 km deep · 49 km away
6. 1.811 km ESE of Willits, CaliforniaFri, Dec 8, 11:45 AM PST · 17465 days ago · 4 km deep · 71 km away
7. 1.512 km ESE of Hidden Valley Lake, CaliforniaFri, Dec 8, 9:54 AM PST · 17466 days ago · 8 km deep · 33 km away
8. 2.112 km ESE of Hidden Valley Lake, CaliforniaFri, Dec 8, 9:51 AM PST · 17466 days ago · 8 km deep · 34 km away
9. 1.56 km W of Cobb, CaliforniaThu, Dec 7, 10:09 PM PST · 17466 days ago · 3 km deep · 1 km away
10. 2.39 km WSW of Cobb, CaliforniaTue, Dec 5, 9:25 AM PST · 17469 days ago · 1 km deep · 3 km away
11. 1.69 km W of Cobb, CaliforniaMon, Dec 4, 10:00 PM PST · 17469 days ago · 0 km deep · 2 km away
12. 2.57 km W of Cobb, CaliforniaMon, Dec 4, 9:39 PM PST · 17469 days ago · 3 km deep · 1 km away
13. 2.57 km W of Cobb, CaliforniaMon, Dec 4, 8:39 PM PST · 17469 days ago · 3 km deep · 1 km away
14. 1.76 km WSW of Cobb, CaliforniaMon, Dec 4, 12:27 PM PST · 17469 days ago · 0 km deep · 2 km away
15. 1.76 km NE of Rohnert Park, CaliforniaSun, Dec 3, 5:46 PM PST · 17470 days ago · 8 km deep · 50 km away
16. 1.74 km WNW of Redwood Valley, CaliforniaSun, Dec 3, 2:12 AM PST · 17471 days ago · 7 km deep · 63 km away
17. 2.26 km W of Cobb, CaliforniaSat, Dec 2, 7:48 PM PST · 17471 days ago · 3 km deep · 1 km away
18. 1.817 km ENE of Potter Valley, CaliforniaFri, Dec 1, 4:44 PM PST · 17472 days ago · 5 km deep · 61 km away
19. 1.96 km ESE of Hopland, CaliforniaFri, Dec 1, 6:12 AM PST · 17473 days ago · 4 km deep · 25 km away
20. 2.212 km ESE of Hidden Valley Lake, CaliforniaThu, Nov 30, 9:40 PM PST · 17473 days ago · 10 km deep · 34 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1043695. Read Sat, Oct 3, 2026, 7:09 AM UTC.