California earthquakes

M1.8 earthquake 3 km NE of Graton, California

A magnitude 1.8 earthquake struck 3 km NE of Graton, California on Sun, Dec 6, 1981, 5:48 PM PST (01:48 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.5 16 km E of Lower Lake, California. This one was a foreshock.

Graton 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), micro
Local time
UTC
1981-12-07 01:48:32 UTC
Depth
3.8 km (2.4 mi), shallow
Epicenter
38.458° N, 122.842° 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, 0.7 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
70°
Stations used
20

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 159 in the 60 days after this one and 64 in the 30 days before it.

After

  1. 1.6Northern California · 16365 days ago · 1 km deep · 42 km away
  2. 2.33 km NNW of Larkfield-Wikiup, California · 16365 days ago · 5 km deep · 11 km away
  3. 1.58 km WSW of Cobb, California · 16363 days ago · 2 km deep · 38 km away
  4. 1.71 km SSE of North Gate, California · 16362 days ago · 10 km deep · 98 km away
  5. 2.59 km WSW of Cobb, California · 16362 days ago · 2 km deep · 38 km away
  6. 1.7Northern California · 16362 days ago · 10 km deep · 97 km away
  7. 3.35 km W of Cobb, California · 16362 days ago · 4 km deep · 40 km away
  8. 1.56 km W of Cobb, California · 16362 days ago · 4 km deep · 40 km away
  9. 1.78 km W of Cobb, California · 16361 days ago · 1 km deep · 40 km away
  10. 2.17 km NNE of Hidden Valley Lake, California · 16361 days ago · 7 km deep · 53 km away
  11. 1.79 km WSW of Cobb, California · 16361 days ago · 2 km deep · 39 km away
  12. 1.66 km W of Cobb, California · 16361 days ago · 1 km deep · 40 km away
  13. 1.6Northern California · 16360 days ago · 0 km deep · 38 km away
  14. 1.64 km WSW of Cobb, California · 16360 days ago · 1 km deep · 39 km away
  15. 1.57 km WSW of Cobb, California · 16359 days ago · 1 km deep · 38 km away
  16. 2.45 km E of Penngrove, California · 16359 days ago · 8 km deep · 27 km away
  17. 1.710 km ENE of Hidden Valley Lake, California · 16357 days ago · 4 km deep · 54 km away
  18. 1.76 km W of Cobb, California · 16357 days ago · 1 km deep · 41 km away
  19. 1.63 km NNW of Clearlake, California · 16357 days ago · 73 km deep · 61 km away
  20. 1.87 km WSW of Cobb, California · 16355 days ago · 2 km deep · 38 km away
  21. 1.97 km WSW of Cobb, California · 16355 days ago · 1 km deep · 39 km away
  22. 1.89 km WSW of Cobb, California · 16355 days ago · 0 km deep · 38 km away
  23. 2.66 km W of Cobb, California · 16354 days ago · 4 km deep · 40 km away
  24. 1.57 km WSW of Cobb, California · 16354 days ago · 0 km deep · 38 km away
  25. 3.14 km E of Penngrove, California · 16353 days ago · 8 km deep · 27 km away
  26. 2.15 km E of Penngrove, California · 16353 days ago · 6 km deep · 27 km away
  27. 1.66 km W of Cobb, California · 16353 days ago · 2 km deep · 40 km away
  28. 1.66 km W of Cobb, California · 16353 days ago · 2 km deep · 40 km away
  29. 2.29 km WSW of Cobb, California · 16353 days ago · 2 km deep · 38 km away
  30. 1.57 km W of Cobb, California · 16352 days ago · 1 km deep · 40 km away
  31. 1.55 km ESE of Roseland, California · 16352 days ago · 10 km deep · 16 km away
  32. 2.64 km E of Penngrove, California · 16352 days ago · 4 km deep · 26 km away
  33. 3.04 km E of Penngrove, California · 16352 days ago · 9 km deep · 26 km away
  34. 2.44 km E of Penngrove, California · 16352 days ago · 5 km deep · 26 km away
  35. 3.14 km E of Penngrove, California · 16352 days ago · 8 km deep · 26 km away
  36. 3.25 km E of Penngrove, California · 16351 days ago · 7 km deep · 27 km away
  37. 1.65 km E of Penngrove, California · 16351 days ago · 2 km deep · 27 km away
  38. 1.87 km W of Cobb, California · 16351 days ago · 3 km deep · 40 km away
  39. 2.54 km ESE of Penngrove, California · 16351 days ago · 0 km deep · 27 km away
  40. 1.94 km E of Penngrove, California · 16351 days ago · 0 km deep · 27 km away
  41. 1.94 km E of Penngrove, California · 16351 days ago · 0 km deep · 27 km away
  42. 1.85 km E of Penngrove, California · 16351 days ago · 1 km deep · 27 km away
  43. 1.8Northern California · 16351 days ago · 4 km deep · 28 km away
  44. 1.5Northern California · 16350 days ago · 1 km deep · 39 km away
  45. 2.0Northern California · 16350 days ago · 3 km deep · 40 km away
  46. 1.95 km WSW of Cobb, California · 16350 days ago · 1 km deep · 39 km away
  47. 1.64 km E of Penngrove, California · 16348 days ago · 0 km deep · 26 km away
  48. 1.65 km E of Penngrove, California · 16348 days ago · 2 km deep · 27 km away
  49. 1.59 km SW of Calistoga, California · 16348 days ago · 4 km deep · 18 km away
  50. 1.83 km ENE of Clear Lake Riviera, California · 16347 days ago · 2 km deep · 58 km away
  51. 2.97 km WSW of Cobb, California · 16347 days ago · 1 km deep · 39 km away
  52. 2.82 km ENE of Pacifica, California · 16346 days ago · 12 km deep · 98 km away
  53. 1.96 km W of Cobb, California · 16346 days ago · 3 km deep · 40 km away
  54. 2.84 km NE of Hopland, California · 16346 days ago · 6 km deep · 63 km away
  55. 2.59 km WSW of Cobb, California · 16345 days ago · 2 km deep · 38 km away
  56. 2.77 km WSW of Cobb, California · 16345 days ago · 0 km deep · 39 km away
  57. 1.96 km W of Cobb, California · 16344 days ago · 1 km deep · 42 km away
  58. 2.37 km W of Cobb, California · 16344 days ago · 0 km deep · 39 km away
  59. 1.74 km E of Penngrove, California · 16344 days ago · 2 km deep · 27 km away
  60. 1.64 km E of Penngrove, California · 16344 days ago · 0 km deep · 27 km away

The first 60 of 159.

Before

  1. 1.67 km W of Cobb, California · 16365 days ago · 1 km deep · 39 km away
  2. 2.07 km S of Calistoga, California · 16365 days ago · 7 km deep · 24 km away
  3. 2.26 km W of Cobb, California · 16365 days ago · 0 km deep · 39 km away
  4. 1.86 km WSW of Cobb, California · 16365 days ago · -1 km deep · 38 km away
  5. 1.6Northern California · 16366 days ago · 1 km deep · 39 km away
  6. 1.917 km NNE of Upper Lake, California · 16366 days ago · 6 km deep · 94 km away
  7. 2.213 km NW of Moskowite Corner, California · 16366 days ago · 9 km deep · 50 km away
  8. 1.66 km WSW of Cobb, California · 16366 days ago · 4 km deep · 39 km away
  9. 1.88 km N of Geyserville, California · 16367 days ago · 3 km deep · 36 km away
  10. 1.98 km N of Geyserville, California · 16367 days ago · 4 km deep · 36 km away
  11. 1.78 km N of Geyserville, California · 16367 days ago · 4 km deep · 36 km away
  12. 2.58 km N of Geyserville, California · 16367 days ago · 4 km deep · 36 km away
  13. 1.98 km N of Geyserville, California · 16367 days ago · 4 km deep · 37 km away
  14. 2.98 km N of Geyserville, California · 16367 days ago · 5 km deep · 37 km away
  15. 1.78 km ESE of Cloverdale, California · 16368 days ago · 5 km deep · 37 km away
  16. 2.38 km ESE of Cloverdale, California · 16369 days ago · 5 km deep · 37 km away
  17. 1.88 km ESE of Cloverdale, California · 16369 days ago · 5 km deep · 37 km away
  18. 2.98 km N of Geyserville, California · 16369 days ago · 5 km deep · 37 km away
  19. 2.08 km N of Geyserville, California · 16370 days ago · 5 km deep · 37 km away
  20. 1.57 km NE of Healdsburg, California · 16370 days ago · 4 km deep · 23 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1070071. Read Sun, Sep 27, 2026, 12:00 AM UTC.