California earthquakes

M1.6 earthquake 9 km W of Cobb, California

A magnitude 1.6 earthquake struck 9 km W of Cobb, California on Mon, Dec 4, 1978, 10:00 PM PST (06:00 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M2.3 9 km WSW of Cobb, California. This one was a foreshock.

Cobb forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.6 (md), micro
Local time
UTC
1978-12-05 06:00:39 UTC
Depth
-0.1 km (-0.0 mi), shallow
Epicenter
38.815° N, 122.829° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.2 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
76°
Stations used
11

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 67 in the 60 days after this one and 46 in the 30 days before it.

After

  1. 2.39 km WSW of Cobb, California · 17458 days ago · 1 km deep · 1 km away
  2. 1.56 km W of Cobb, California · 17456 days ago · 3 km deep · 2 km away
  3. 2.112 km ESE of Hidden Valley Lake, California · 17455 days ago · 8 km deep · 35 km away
  4. 1.512 km ESE of Hidden Valley Lake, California · 17455 days ago · 8 km deep · 35 km away
  5. 1.811 km ESE of Willits, California · 17455 days ago · 4 km deep · 71 km away
  6. 1.64 km E of Saint Helena, California · 17455 days ago · 5 km deep · 50 km away
  7. 1.96 km W of Cobb, California · 17455 days ago · 0 km deep · 3 km away
  8. 3.46 km WSW of Cobb, California · 17454 days ago · 0 km deep · 3 km away
  9. 1.7Northern California · 17454 days ago · 18 km deep · 21 km away
  10. 2.0Northern California · 17454 days ago · 8 km deep · 35 km away
  11. 1.77 km W of Cobb, California · 17454 days ago · -1 km deep · 2 km away
  12. 2.110 km SE of Sonoma, California · 17452 days ago · 7 km deep · 77 km away
  13. 1.810 km SE of Hopland, California · 17451 days ago · 2 km deep · 20 km away
  14. 1.912 km ESE of Hidden Valley Lake, California · 17450 days ago · 8 km deep · 35 km away
  15. 3.26 km W of Cobb, California · 17449 days ago · 4 km deep · 3 km away
  16. 1.56 km W of Cobb, California · 17449 days ago · 3 km deep · 3 km away
  17. 1.611 km ESE of Willits, California · 17448 days ago · 4 km deep · 71 km away
  18. 2.33 km SE of Calpella, California · 17445 days ago · 6 km deep · 54 km away
  19. 1.75 km W of Cobb, California · 17445 days ago · 0 km deep · 4 km away
  20. 1.67 km WSW of Cobb, California · 17444 days ago · 1 km deep · 2 km away
  21. 2.411 km ESE of Hidden Valley Lake, California · 17444 days ago · 10 km deep · 35 km away
  22. 1.99 km ENE of Brooktrails, California · 17442 days ago · 9 km deep · 84 km away
  23. 2.519 km NNE of Upper Lake, California · 17441 days ago · 7 km deep · 55 km away
  24. 1.917 km SW of Hopland, California · 17441 days ago · 1 km deep · 38 km away
  25. 1.98 km WSW of Cobb, California · 17441 days ago · 1 km deep · 2 km away
  26. 1.610 km ESE of Hidden Valley Lake, California · 17439 days ago · 6 km deep · 33 km away
  27. 1.68 km WSW of Cobb, California · 17439 days ago · 1 km deep · 2 km away
  28. 2.16 km E of Willits, California · 17438 days ago · 1 km deep · 78 km away
  29. 1.67 km WSW of Cobb, California · 17437 days ago · 2 km deep · 2 km away
  30. 1.76 km W of Cobb, California · 17437 days ago · 1 km deep · 2 km away
  31. 2.010 km SSE of Willits, California · 17435 days ago · 4 km deep · 70 km away
  32. 1.95 km ESE of Black Point-Green Point, California · 17434 days ago · 5 km deep · 86 km away
  33. 1.98 km WSW of Cobb, California · 17434 days ago · 1 km deep · 1 km away
  34. 1.96 km W of Cobb, California · 17434 days ago · 3 km deep · 3 km away
  35. 2.23 km W of Deer Park, California · 17434 days ago · 8 km deep · 41 km away
  36. 2.07 km WSW of Cobb, California · 17431 days ago · 1 km deep · 3 km away
  37. 1.67 km WSW of Cobb, California · 17429 days ago · 3 km deep · 3 km away
  38. 1.51 km WSW of Moskowite Corner, California · 17429 days ago · 12 km deep · 68 km away
  39. 1.927 km SE of Covelo, California · 17425 days ago · 0 km deep · 89 km away
  40. 1.67 km W of Healdsburg, California · 17425 days ago · 1 km deep · 24 km away
  41. 2.45 km E of Black Point-Green Point, California · 17423 days ago · 12 km deep · 84 km away
  42. 1.66 km W of Cobb, California · 17422 days ago · 4 km deep · 2 km away
  43. 1.87 km W of Cobb, California · 17420 days ago · 3 km deep · 2 km away
  44. 1.76 km W of Cobb, California · 17420 days ago · 4 km deep · 3 km away
  45. 2.52 km SSW of Monument Hills, California · 17415 days ago · 10 km deep · 84 km away
  46. 2.76 km W of Cobb, California · 17414 days ago · 0 km deep · 3 km away
  47. 1.76 km W of Cobb, California · 17414 days ago · 0 km deep · 3 km away
  48. 1.58 km WSW of Cobb, California · 17413 days ago · 1 km deep · 2 km away
  49. 2.99 km WNW of Princeton, California · 17411 days ago · 15 km deep · 92 km away
  50. 1.67 km WSW of Cobb, California · 17410 days ago · 2 km deep · 2 km away
  51. 1.65 km W of Cobb, California · 17409 days ago · 1 km deep · 4 km away
  52. 1.87 km W of Cobb, California · 17408 days ago · 4 km deep · 2 km away
  53. 2.04 km NNW of Winters, California · 17408 days ago · 2 km deep · 78 km away
  54. 1.58 km ENE of Santa Rosa, California · 17407 days ago · 0 km deep · 41 km away
  55. 2.54 km SSE of Dunnigan, California · 17406 days ago · 8 km deep · 76 km away
  56. 2.08 km E of Willits, California · 17405 days ago · 7 km deep · 75 km away
  57. 1.68 km W of Cobb, California · 17404 days ago · 1 km deep · 1 km away
  58. 2.07 km W of Cobb, California · 17403 days ago · 3 km deep · 2 km away
  59. 3.08 km E of Willits, California · 17403 days ago · 8 km deep · 75 km away
  60. 2.68 km E of Willits, California · 17403 days ago · 9 km deep · 75 km away

The first 60 of 67.

Before

  1. 2.57 km W of Cobb, California · 17459 days ago · 3 km deep · 2 km away
  2. 2.57 km W of Cobb, California · 17459 days ago · 3 km deep · 2 km away
  3. 1.76 km WSW of Cobb, California · 17459 days ago · 0 km deep · 3 km away
  4. 1.76 km NE of Rohnert Park, California · 17460 days ago · 8 km deep · 50 km away
  5. 1.74 km WNW of Redwood Valley, California · 17460 days ago · 7 km deep · 63 km away
  6. 2.26 km W of Cobb, California · 17461 days ago · 3 km deep · 3 km away
  7. 1.817 km ENE of Potter Valley, California · 17462 days ago · 5 km deep · 62 km away
  8. 1.96 km ESE of Hopland, California · 17462 days ago · 4 km deep · 24 km away
  9. 2.212 km ESE of Hidden Valley Lake, California · 17463 days ago · 10 km deep · 35 km away
  10. 2.610 km NNE of Brooktrails, California · 17463 days ago · 8 km deep · 90 km away
  11. 2.113 km ESE of Hidden Valley Lake, California · 17463 days ago · 8 km deep · 36 km away
  12. 2.17 km W of Cobb, California · 17465 days ago · 1 km deep · 2 km away
  13. 1.78 km W of Cobb, California · 17466 days ago · 1 km deep · 1 km away
  14. 2.0near the coast of Northern California · 17467 days ago · 4 km deep · 53 km away
  15. 1.810 km SE of Willits, California · 17467 days ago · 10 km deep · 71 km away
  16. 1.68 km W of Cobb, California · 17469 days ago · 0 km deep · 1 km away
  17. 2.28 km W of Cobb, California · 17469 days ago · 0 km deep · 1 km away
  18. 1.98 km W of Cobb, California · 17469 days ago · 1 km deep · 1 km away
  19. 1.56 km W of Cobb, California · 17470 days ago · 4 km deep · 3 km away
  20. 1.57 km WSW of Cobb, California · 17471 days ago · 4 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1043631. Read Tue, Sep 22, 2026, 8:45 PM UTC.