California earthquakes

M2.1 earthquake 10 km SE of Sonoma, California

A magnitude 2.1 earthquake struck 10 km SE of Sonoma, California on Mon, Dec 11, 1978, 3:46 AM PST (11:46 UTC), 7 km (5 mi) below the surface.

A larger quake followed: M2.1 3 km E of Berkeley, California. This one was a foreshock.

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Map

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

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The earthquake

Magnitude
2.1 (md), micro
Local time
UTC
1978-12-11 11:46:35 UTC
Depth
7.4 km (4.6 mi), shallow
Epicenter
38.223° N, 122.370° 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 0.4 km horizontally, 1.2 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
96°
Stations used
7

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 60 in the 60 days after this one and 36 in the 30 days before it.

After

  1. 1.810 km SE of Hopland, California · 17451 days ago · 2 km deep · 96 km away
  2. 1.912 km ESE of Hidden Valley Lake, California · 17450 days ago · 8 km deep · 60 km away
  3. 2.13 km E of Berkeley, California · 17450 days ago · 11 km deep · 40 km away
  4. 3.26 km W of Cobb, California · 17449 days ago · 4 km deep · 76 km away
  5. 1.93 km E of Moraga, California · 17449 days ago · 2 km deep · 50 km away
  6. 1.56 km W of Cobb, California · 17449 days ago · 3 km deep · 76 km away
  7. 1.75 km W of Cobb, California · 17445 days ago · 0 km deep · 77 km away
  8. 1.67 km WSW of Cobb, California · 17445 days ago · 1 km deep · 75 km away
  9. 2.411 km ESE of Hidden Valley Lake, California · 17444 days ago · 10 km deep · 61 km away
  10. 1.98 km WSW of Cobb, California · 17441 days ago · 1 km deep · 75 km away
  11. 1.611 km SE of Sunol, California · 17439 days ago · 3 km deep · 93 km away
  12. 1.610 km ESE of Hidden Valley Lake, California · 17439 days ago · 6 km deep · 61 km away
  13. 1.68 km WSW of Cobb, California · 17439 days ago · 1 km deep · 75 km away
  14. 1.67 km WSW of Cobb, California · 17437 days ago · 2 km deep · 75 km away
  15. 1.76 km W of Cobb, California · 17437 days ago · 1 km deep · 77 km away
  16. 1.95 km ESE of Black Point-Green Point, California · 17435 days ago · 5 km deep · 15 km away
  17. 1.98 km WSW of Cobb, California · 17434 days ago · 1 km deep · 76 km away
  18. 1.96 km W of Cobb, California · 17434 days ago · 3 km deep · 76 km away
  19. 2.23 km W of Deer Park, California · 17434 days ago · 8 km deep · 37 km away
  20. 2.48 km N of East Foothills, California · 17432 days ago · 6 km deep · 99 km away
  21. 2.07 km WSW of Cobb, California · 17431 days ago · 1 km deep · 74 km away
  22. 1.67 km WSW of Cobb, California · 17430 days ago · 3 km deep · 74 km away
  23. 1.51 km WSW of Moskowite Corner, California · 17429 days ago · 12 km deep · 27 km away
  24. 1.84 km WSW of North Richmond, California · 17427 days ago · 8 km deep · 31 km away
  25. 1.67 km W of Healdsburg, California · 17425 days ago · 1 km deep · 68 km away
  26. 2.45 km E of Black Point-Green Point, California · 17423 days ago · 12 km deep · 13 km away
  27. 1.66 km W of Cobb, California · 17422 days ago · 4 km deep · 76 km away
  28. 1.87 km W of Cobb, California · 17420 days ago · 3 km deep · 76 km away
  29. 1.76 km W of Cobb, California · 17420 days ago · 4 km deep · 76 km away
  30. 2.11 km WNW of Diablo, California · 17419 days ago · 9 km deep · 55 km away
  31. 1.76 km E of Sunol, California · 17417 days ago · 9 km deep · 86 km away
  32. 2.52 km SSW of Monument Hills, California · 17415 days ago · 10 km deep · 63 km away
  33. 2.76 km W of Cobb, California · 17414 days ago · 0 km deep · 76 km away
  34. 1.76 km W of Cobb, California · 17414 days ago · 0 km deep · 76 km away
  35. 1.58 km WSW of Cobb, California · 17414 days ago · 1 km deep · 76 km away
  36. 1.82 km N of San Leandro, California · 17412 days ago · 3 km deep · 56 km away
  37. 2.53 km S of Diablo, California · 17412 days ago · 19 km deep · 59 km away
  38. 1.67 km WSW of Cobb, California · 17410 days ago · 2 km deep · 75 km away
  39. 1.65 km W of Cobb, California · 17409 days ago · 1 km deep · 77 km away
  40. 1.87 km W of Cobb, California · 17409 days ago · 4 km deep · 76 km away
  41. 2.04 km NNW of Winters, California · 17408 days ago · 2 km deep · 51 km away
  42. 1.58 km ENE of Santa Rosa, California · 17407 days ago · 0 km deep · 36 km away
  43. 2.54 km SSE of Dunnigan, California · 17406 days ago · 8 km deep · 78 km away
  44. 1.72 km N of Ashland, California · 17406 days ago · 5 km deep · 60 km away
  45. 1.72 km SW of Livermore, California · 17405 days ago · 8 km deep · 80 km away
  46. 1.68 km W of Cobb, California · 17404 days ago · 1 km deep · 77 km away
  47. 2.07 km W of Cobb, California · 17404 days ago · 3 km deep · 76 km away
  48. 2.06 km W of Cobb, California · 17403 days ago · 4 km deep · 76 km away
  49. 1.95 km ESE of Healdsburg, California · 17403 days ago · 6 km deep · 57 km away
  50. 1.67 km W of Cobb, California · 17403 days ago · -1 km deep · 76 km away
  51. 2.54 km WSW of Cobb, California · 17402 days ago · 2 km deep · 73 km away
  52. 1.52 km ENE of Clear Lake Riviera, California · 17402 days ago · 3 km deep · 87 km away
  53. 2.07 km NE of Inverness, California · 17399 days ago · 0 km deep · 37 km away
  54. 2.63 km SE of Concord, California · 17399 days ago · 13 km deep · 44 km away
  55. 2.09 km S of Moskowite Corner, California · 17399 days ago · 7 km deep · 21 km away
  56. 2.57 km W of Cobb, California · 17398 days ago · 4 km deep · 77 km away
  57. 2.410 km SE of Dunnigan, California · 17398 days ago · 9 km deep · 77 km away
  58. 3.05 km SSW of Moraga, California · 17397 days ago · 10 km deep · 52 km away
  59. 1.87 km NNE of East Foothills, California · 17394 days ago · 6 km deep · 99 km away
  60. 1.61 km WSW of Guinda, California · 17393 days ago · 5 km deep · 68 km away

Before

  1. 1.77 km W of Cobb, California · 17454 days ago · -1 km deep · 77 km away
  2. 2.0Northern California · 17454 days ago · 8 km deep · 60 km away
  3. 1.7Northern California · 17455 days ago · 18 km deep · 56 km away
  4. 3.46 km WSW of Cobb, California · 17455 days ago · 0 km deep · 75 km away
  5. 1.96 km W of Cobb, California · 17455 days ago · 0 km deep · 77 km away
  6. 1.64 km E of Saint Helena, California · 17455 days ago · 5 km deep · 32 km away
  7. 1.512 km ESE of Hidden Valley Lake, California · 17455 days ago · 8 km deep · 60 km away
  8. 2.112 km ESE of Hidden Valley Lake, California · 17455 days ago · 8 km deep · 60 km away
  9. 1.56 km W of Cobb, California · 17456 days ago · 3 km deep · 76 km away
  10. 2.39 km WSW of Cobb, California · 17458 days ago · 1 km deep · 76 km away
  11. 1.69 km W of Cobb, California · 17459 days ago · 0 km deep · 77 km away
  12. 2.57 km W of Cobb, California · 17459 days ago · 3 km deep · 76 km away
  13. 2.57 km W of Cobb, California · 17459 days ago · 3 km deep · 76 km away
  14. 1.76 km WSW of Cobb, California · 17459 days ago · 0 km deep · 75 km away
  15. 2.48 km SE of Sunol, California · 17460 days ago · 10 km deep · 90 km away
  16. 1.76 km NE of Rohnert Park, California · 17460 days ago · 8 km deep · 31 km away
  17. 2.26 km W of Cobb, California · 17461 days ago · 3 km deep · 76 km away
  18. 1.96 km ESE of Hopland, California · 17463 days ago · 4 km deep · 99 km away
  19. 2.212 km ESE of Hidden Valley Lake, California · 17463 days ago · 10 km deep · 61 km away
  20. 2.113 km ESE of Hidden Valley Lake, California · 17463 days ago · 8 km deep · 59 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1043708. Read Wed, Sep 23, 2026, 3:38 AM UTC.