California earthquakes

M3.1 earthquake 9 km WSW of Cobb, California

A magnitude 3.1 earthquake struck 9 km WSW of Cobb, California on Sat, Oct 31, 1981, 12:59 AM PST (08:59 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.3 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
3.1 (ml), minor
Local time
UTC
1981-10-31 08:59:06 UTC
Depth
1.3 km (0.8 mi), shallow
Epicenter
38.799° N, 122.827° 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 0.1 km horizontally, 0.2 km in depth
Depth from
From location
Station coverage gap
25°
Stations used
46

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 156 in the 60 days after this one and 37 in the 30 days before it.

After

  1. 3.39 km WSW of Cobb, California · 16398 days ago · 1 km deep · 0 km away
  2. 1.98 km WSW of Cobb, California · 16398 days ago · 1 km deep · 0 km away
  3. 1.73 km S of Green Valley, California · 16395 days ago · 9 km deep · 86 km away
  4. 1.64 km SSE of Clear Lake Riviera, California · 16395 days ago · 3 km deep · 17 km away
  5. 1.99 km ESE of Willits, California · 16392 days ago · 7 km deep · 75 km away
  6. 2.523 km W of Elk Creek, California · 16392 days ago · 6 km deep · 93 km away
  7. 2.26 km W of Cobb, California · 16389 days ago · 3 km deep · 3 km away
  8. 1.77 km E of Geyserville, California · 16388 days ago · 6 km deep · 12 km away
  9. 1.85 km SW of Cobb, California · 16387 days ago · 0 km deep · 5 km away
  10. 1.73 km W of Forestville, California · 16385 days ago · 0 km deep · 38 km away
  11. 1.8Northern California · 16384 days ago · 0 km deep · 5 km away
  12. 1.99 km WSW of Cobb, California · 16384 days ago · 2 km deep · 1 km away
  13. 2.57 km WSW of Cobb, California · 16383 days ago · 1 km deep · 2 km away
  14. 2.85 km SW of Cobb, California · 16383 days ago · 0 km deep · 5 km away
  15. 1.66 km WSW of Cobb, California · 16383 days ago · -1 km deep · 3 km away
  16. 2.15 km SW of Cobb, California · 16382 days ago · 0 km deep · 5 km away
  17. 1.67 km W of Cobb, California · 16382 days ago · 1 km deep · 3 km away
  18. 2.07 km W of Cobb, California · 16382 days ago · -1 km deep · 3 km away
  19. 2.06 km WSW of Cobb, California · 16381 days ago · 1 km deep · 3 km away
  20. 2.06 km WSW of Cobb, California · 16381 days ago · 1 km deep · 3 km away
  21. 1.96 km WSW of Cobb, California · 16381 days ago · 1 km deep · 3 km away
  22. 1.78 km SE of Willits, California · 16380 days ago · 3 km deep · 74 km away
  23. 1.68 km E of Willits, California · 16379 days ago · 8 km deep · 76 km away
  24. 1.75 km WSW of Cobb, California · 16379 days ago · 0 km deep · 4 km away
  25. 1.95 km WSW of Kenwood, California · 16378 days ago · 9 km deep · 50 km away
  26. 2.09 km NNE of Cloverdale, California · 16376 days ago · 1 km deep · 16 km away
  27. 1.57 km WSW of Cobb, California · 16376 days ago · 2 km deep · 2 km away
  28. 1.94 km W of Cobb, California · 16376 days ago · 1 km deep · 5 km away
  29. 2.16 km WSW of Cobb, California · 16375 days ago · 0 km deep · 3 km away
  30. 2.46 km WSW of Cobb, California · 16375 days ago · 1 km deep · 3 km away
  31. 1.62 km ESE of Calpella, California · 16375 days ago · 3 km deep · 56 km away
  32. 2.57 km WSW of Cobb, California · 16374 days ago · 1 km deep · 2 km away
  33. 1.619 km ENE of Potter Valley, California · 16374 days ago · 1 km deep · 65 km away
  34. 2.09 km WSW of Cobb, California · 16373 days ago · 3 km deep · 0 km away
  35. 1.511 km NNE of Potter Valley, California · 16373 days ago · 3 km deep · 73 km away
  36. 1.67 km W of Cobb, California · 16373 days ago · 1 km deep · 3 km away
  37. 1.67 km W of Cobb, California · 16373 days ago · 1 km deep · 3 km away
  38. 2.97 km W of Cobb, California · 16373 days ago · 1 km deep · 3 km away
  39. 1.67 km W of Cobb, California · 16373 days ago · 4 km deep · 2 km away
  40. 1.67 km W of Cobb, California · 16373 days ago · 1 km deep · 4 km away
  41. 2.320 km NE of Potter Valley, California · 16373 days ago · 7 km deep · 71 km away
  42. 1.81 km N of Willits, California · 16372 days ago · 7 km deep · 83 km away
  43. 1.56 km WSW of Cobb, California · 16372 days ago · 1 km deep · 3 km away
  44. 1.98 km N of Geyserville, California · 16371 days ago · 5 km deep · 8 km away
  45. 1.57 km W of Cobb, California · 16370 days ago · 0 km deep · 2 km away
  46. 2.26 km W of Cobb, California · 16370 days ago · 3 km deep · 4 km away
  47. 1.65 km SW of Cobb, California · 16370 days ago · -1 km deep · 5 km away
  48. 1.55 km WSW of Cobb, California · 16370 days ago · 0 km deep · 5 km away
  49. 1.67 km ESE of Cloverdale, California · 16369 days ago · 5 km deep · 10 km away
  50. 1.76 km W of Cobb, California · 16368 days ago · 3 km deep · 3 km away
  51. 2.58 km NNW of Redwood Valley, California · 16368 days ago · 6 km deep · 70 km away
  52. 1.78 km W of Cobb, California · 16368 days ago · 0 km deep · 2 km away
  53. 2.29 km WSW of Cobb, California · 16368 days ago · 1 km deep · 0 km away
  54. 1.65 km NW of Moskowite Corner, California · 16368 days ago · 11 km deep · 63 km away
  55. 1.93 km WNW of American Canyon, California · 16366 days ago · 6 km deep · 82 km away
  56. 1.57 km NE of Healdsburg, California · 16366 days ago · 4 km deep · 16 km away
  57. 2.08 km N of Geyserville, California · 16366 days ago · 5 km deep · 8 km away
  58. 2.98 km N of Geyserville, California · 16366 days ago · 5 km deep · 8 km away
  59. 1.88 km ESE of Cloverdale, California · 16366 days ago · 5 km deep · 8 km away
  60. 2.38 km ESE of Cloverdale, California · 16365 days ago · 5 km deep · 8 km away

The first 60 of 156.

Before

  1. 1.89 km WSW of Cobb, California · 16398 days ago · 1 km deep · 0 km away
  2. 1.610 km WSW of Cobb, California · 16398 days ago · 3 km deep · 1 km away
  3. 2.66 km N of Robbins, California · 16399 days ago · 21 km deep · 99 km away
  4. 2.65 km SW of Cobb, California · 16399 days ago · 0 km deep · 5 km away
  5. 2.26 km W of Cobb, California · 16399 days ago · 0 km deep · 4 km away
  6. 3.17 km W of Cobb, California · 16399 days ago · 1 km deep · 3 km away
  7. 2.07 km W of Cobb, California · 16399 days ago · 1 km deep · 3 km away
  8. 1.59 km WSW of Cobb, California · 16399 days ago · 1 km deep · 1 km away
  9. 2.518 km N of Moskowite Corner, California · 16400 days ago · 8 km deep · 57 km away
  10. 2.417 km N of Moskowite Corner, California · 16400 days ago · 9 km deep · 58 km away
  11. 1.56 km WNW of Cobb, California · 16400 days ago · 1 km deep · 5 km away
  12. 1.818 km N of Moskowite Corner, California · 16400 days ago · 8 km deep · 58 km away
  13. 1.66 km W of Cobb, California · 16400 days ago · 4 km deep · 3 km away
  14. 1.65 km SSW of Cobb, California · 16401 days ago · 0 km deep · 8 km away
  15. 1.77 km WSW of Cobb, California · 16401 days ago · 1 km deep · 2 km away
  16. 2.29 km WSW of Cobb, California · 16406 days ago · 0 km deep · 0 km away
  17. 3.515 km N of Brooktrails, California · 16407 days ago · 9 km deep · 98 km away
  18. 1.68 km ENE of Brooktrails, California · 16407 days ago · 8 km deep · 87 km away
  19. 2.35 km SW of Cobb, California · 16411 days ago · 0 km deep · 5 km away
  20. 1.57 km WSW of Cobb, California · 16411 days ago · 2 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1069089 (also filed as usp0001gr7). Read Wed, Sep 23, 2026, 6:10 AM UTC.