California earthquakes

M1.8 earthquake 6 km WSW of Cobb, California

A magnitude 1.8 earthquake struck 6 km WSW of Cobb, California on Sun, Dec 6, 1981, 7:56 AM PST (15:56 UTC), -1 km (-1 mi) below the surface.

A larger quake followed: M3.5 16 km E of Lower Lake, 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
1.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1981-12-06 15:56:30 UTC
Depth
-0.9 km (-0.5 mi), shallow
Epicenter
38.799° N, 122.787° 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, 0.8 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
39°
Stations used
19

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 171 in the 60 days after this one and 67 in the 30 days before it.

After

  1. 2.26 km W of Cobb, California · 16370 days ago · 0 km deep · 2 km away
  2. 2.07 km S of Calistoga, California · 16370 days ago · 7 km deep · 37 km away
  3. 1.67 km W of Cobb, California · 16370 days ago · 1 km deep · 2 km away
  4. 1.83 km NE of Graton, California · 16369 days ago · 4 km deep · 38 km away
  5. 1.6Northern California · 16369 days ago · 1 km deep · 4 km away
  6. 2.33 km NNW of Larkfield-Wikiup, California · 16369 days ago · 5 km deep · 29 km away
  7. 3.27 km ENE of Brooktrails, California · 16369 days ago · 10 km deep · 87 km away
  8. 2.221 km W of Stonyford, California · 16368 days ago · 4 km deep · 66 km away
  9. 1.58 km WSW of Cobb, California · 16368 days ago · 2 km deep · 3 km away
  10. 2.721 km W of Stonyford, California · 16367 days ago · 4 km deep · 66 km away
  11. 2.0Northern California · 16367 days ago · 2 km deep · 66 km away
  12. 2.59 km WSW of Cobb, California · 16366 days ago · 2 km deep · 4 km away
  13. 3.35 km W of Cobb, California · 16366 days ago · 4 km deep · 2 km away
  14. 1.56 km W of Cobb, California · 16366 days ago · 4 km deep · 2 km away
  15. 1.78 km W of Cobb, California · 16366 days ago · 1 km deep · 4 km away
  16. 2.17 km NNE of Hidden Valley Lake, California · 16366 days ago · 7 km deep · 23 km away
  17. 1.79 km WSW of Cobb, California · 16366 days ago · 2 km deep · 4 km away
  18. 1.66 km W of Cobb, California · 16365 days ago · 1 km deep · 2 km away
  19. 1.88 km E of Willits, California · 16365 days ago · 8 km deep · 78 km away
  20. 1.6Northern California · 16364 days ago · 0 km deep · 1 km away
  21. 1.64 km WSW of Cobb, California · 16364 days ago · 1 km deep · 1 km away
  22. 1.57 km WSW of Cobb, California · 16363 days ago · 1 km deep · 2 km away
  23. 2.45 km E of Penngrove, California · 16363 days ago · 8 km deep · 57 km away
  24. 1.710 km ENE of Hidden Valley Lake, California · 16362 days ago · 4 km deep · 30 km away
  25. 1.76 km W of Cobb, California · 16362 days ago · 1 km deep · 4 km away
  26. 1.63 km NNW of Clearlake, California · 16362 days ago · 73 km deep · 24 km away
  27. 2.512 km NW of Stonyford, California · 16361 days ago · 9 km deep · 72 km away
  28. 2.512 km WNW of Stonyford, California · 16361 days ago · 9 km deep · 72 km away
  29. 1.87 km WSW of Cobb, California · 16360 days ago · 2 km deep · 2 km away
  30. 1.97 km WSW of Cobb, California · 16360 days ago · 1 km deep · 2 km away
  31. 1.89 km WSW of Cobb, California · 16359 days ago · 0 km deep · 3 km away
  32. 2.66 km W of Cobb, California · 16358 days ago · 4 km deep · 2 km away
  33. 1.57 km WSW of Cobb, California · 16358 days ago · 0 km deep · 1 km away
  34. 3.14 km E of Penngrove, California · 16358 days ago · 8 km deep · 57 km away
  35. 2.15 km E of Penngrove, California · 16358 days ago · 6 km deep · 58 km away
  36. 1.66 km W of Cobb, California · 16357 days ago · 2 km deep · 2 km away
  37. 1.66 km W of Cobb, California · 16357 days ago · 2 km deep · 2 km away
  38. 2.29 km WSW of Cobb, California · 16357 days ago · 2 km deep · 4 km away
  39. 1.57 km W of Cobb, California · 16357 days ago · 1 km deep · 3 km away
  40. 1.55 km ESE of Roseland, California · 16357 days ago · 10 km deep · 45 km away
  41. 2.64 km E of Penngrove, California · 16356 days ago · 4 km deep · 57 km away
  42. 3.04 km E of Penngrove, California · 16356 days ago · 9 km deep · 57 km away
  43. 2.44 km E of Penngrove, California · 16356 days ago · 5 km deep · 57 km away
  44. 3.14 km E of Penngrove, California · 16356 days ago · 8 km deep · 57 km away
  45. 1.620 km NE of Potter Valley, California · 16356 days ago · 4 km deep · 75 km away
  46. 1.720 km NE of Potter Valley, California · 16356 days ago · 7 km deep · 75 km away
  47. 3.25 km E of Penngrove, California · 16356 days ago · 7 km deep · 57 km away
  48. 1.65 km E of Penngrove, California · 16356 days ago · 2 km deep · 58 km away
  49. 1.87 km W of Cobb, California · 16356 days ago · 3 km deep · 2 km away
  50. 2.54 km ESE of Penngrove, California · 16356 days ago · 0 km deep · 58 km away
  51. 1.94 km E of Penngrove, California · 16355 days ago · 0 km deep · 58 km away
  52. 1.94 km E of Penngrove, California · 16355 days ago · 0 km deep · 58 km away
  53. 1.85 km E of Penngrove, California · 16355 days ago · 1 km deep · 57 km away
  54. 1.8Northern California · 16355 days ago · 4 km deep · 11 km away
  55. 1.5Northern California · 16355 days ago · 1 km deep · 2 km away
  56. 2.0Northern California · 16355 days ago · 3 km deep · 2 km away
  57. 1.95 km WSW of Cobb, California · 16354 days ago · 1 km deep · 1 km away
  58. 1.64 km E of Penngrove, California · 16352 days ago · 0 km deep · 57 km away
  59. 1.65 km E of Penngrove, California · 16352 days ago · 2 km deep · 57 km away
  60. 1.59 km SW of Calistoga, California · 16352 days ago · 4 km deep · 34 km away

The first 60 of 171.

Before

  1. 1.6Northern California · 16370 days ago · 1 km deep · 1 km away
  2. 1.917 km NNE of Upper Lake, California · 16370 days ago · 6 km deep · 57 km away
  3. 2.213 km NW of Moskowite Corner, California · 16370 days ago · 9 km deep · 52 km away
  4. 1.66 km WSW of Cobb, California · 16371 days ago · 4 km deep · 1 km away
  5. 1.621 km W of Stonyford, California · 16372 days ago · 1 km deep · 66 km away
  6. 1.88 km N of Geyserville, California · 16372 days ago · 3 km deep · 12 km away
  7. 1.98 km N of Geyserville, California · 16372 days ago · 4 km deep · 12 km away
  8. 1.78 km N of Geyserville, California · 16372 days ago · 4 km deep · 12 km away
  9. 2.58 km N of Geyserville, California · 16372 days ago · 4 km deep · 12 km away
  10. 1.98 km N of Geyserville, California · 16372 days ago · 4 km deep · 12 km away
  11. 2.98 km N of Geyserville, California · 16372 days ago · 5 km deep · 12 km away
  12. 1.78 km ESE of Cloverdale, California · 16373 days ago · 5 km deep · 11 km away
  13. 2.38 km ESE of Cloverdale, California · 16374 days ago · 5 km deep · 11 km away
  14. 1.88 km ESE of Cloverdale, California · 16374 days ago · 5 km deep · 11 km away
  15. 2.98 km N of Geyserville, California · 16374 days ago · 5 km deep · 12 km away
  16. 2.08 km N of Geyserville, California · 16374 days ago · 5 km deep · 11 km away
  17. 1.57 km NE of Healdsburg, California · 16374 days ago · 4 km deep · 16 km away
  18. 1.93 km WNW of American Canyon, California · 16374 days ago · 6 km deep · 80 km away
  19. 1.65 km NW of Moskowite Corner, California · 16376 days ago · 11 km deep · 60 km away
  20. 2.29 km WSW of Cobb, California · 16376 days ago · 1 km deep · 3 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1070058. Read Thu, Oct 1, 2026, 11:28 AM UTC.