California earthquakes

M2.5 earthquake 4 km SW of Cobb, California

A magnitude 2.5 earthquake struck 4 km SW of Cobb, California on Mon, Apr 27, 1987, 12:34 AM PDT (07:34 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M2.6 5 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
2.5 (md), micro
Local time
UTC
1987-04-27 07:34:58 UTC
Depth
0.1 km (0.1 mi), shallow
Epicenter
38.796° N, 122.768° 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, 0.4 km in depth
Magnitude uncertainty
±0.21
Depth from
From location
Station coverage gap
42°
Stations used
33

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 177 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.56 km WSW of Cobb, California · 14375 days ago · 3 km deep · 3 km away
  2. 1.67 km WSW of Cobb, California · 14375 days ago · 4 km deep · 3 km away
  3. 1.62 km SSW of Sutter, California · 14375 days ago · 5 km deep · 95 km away
  4. 1.75 km SW of Cobb, California · 14374 days ago · 2 km deep · 1 km away
  5. 2.65 km WSW of Cobb, California · 14374 days ago · 1 km deep · 3 km away
  6. 1.57 km W of Cobb, California · 14374 days ago · 0 km deep · 4 km away
  7. 1.88 km WSW of Cobb, California · 14374 days ago · 3 km deep · 4 km away
  8. 1.84 km W of Cobb, California · 14374 days ago · -1 km deep · 2 km away
  9. 1.66 km W of Cobb, California · 14373 days ago · 3 km deep · 3 km away
  10. 2.35 km W of Cobb, California · 14373 days ago · 0 km deep · 3 km away
  11. 2.07 km W of Cobb, California · 14373 days ago · 1 km deep · 5 km away
  12. 1.77 km W of Cobb, California · 14373 days ago · 3 km deep · 4 km away
  13. 1.58 km W of Cobb, California · 14373 days ago · -1 km deep · 5 km away
  14. 1.52 km SSE of Calistoga, California · 14372 days ago · 2 km deep · 32 km away
  15. 1.710 km NW of Cobb, California · 14372 days ago · 0 km deep · 10 km away
  16. 2.58 km W of Cobb, California · 14372 days ago · 1 km deep · 5 km away
  17. 1.78 km W of Cobb, California · 14371 days ago · 4 km deep · 6 km away
  18. 2.04 km W of Cobb, California · 14371 days ago · 0 km deep · 3 km away
  19. 2.86 km W of Cobb, California · 14371 days ago · 3 km deep · 3 km away
  20. 1.69 km W of Cobb, California · 14370 days ago · 0 km deep · 6 km away
  21. 1.95 km WSW of Cobb, California · 14370 days ago · 1 km deep · 1 km away
  22. 1.68 km W of Cobb, California · 14370 days ago · -1 km deep · 5 km away
  23. 1.56 km W of Cobb, California · 14370 days ago · 3 km deep · 4 km away
  24. 1.65 km W of Cobb, California · 14370 days ago · -1 km deep · 3 km away
  25. 1.5Northern California · 14370 days ago · 8 km deep · 26 km away
  26. 1.86 km SSE of Cottonwood, California · 14370 days ago · 0 km deep · 75 km away
  27. 1.56 km W of Cobb, California · 14369 days ago · 4 km deep · 4 km away
  28. 1.67 km WSW of Cobb, California · 14368 days ago · 1 km deep · 3 km away
  29. 1.65 km N of Winters, California · 14368 days ago · 1 km deep · 74 km away
  30. 2.11 km NNW of Winters, California · 14368 days ago · 2 km deep · 74 km away
  31. 2.14 km W of Cobb, California · 14367 days ago · 0 km deep · 3 km away
  32. 1.86 km W of Cobb, California · 14367 days ago · 3 km deep · 4 km away
  33. 2.39 km W of Cobb, California · 14366 days ago · 0 km deep · 5 km away
  34. 1.78 km W of Cobb, California · 14366 days ago · -1 km deep · 6 km away
  35. 1.86 km W of Cobb, California · 14366 days ago · 3 km deep · 3 km away
  36. 2.09 km W of Cobb, California · 14366 days ago · 0 km deep · 6 km away
  37. 1.6Northern California · 14366 days ago · 4 km deep · 12 km away
  38. 1.85 km WSW of Cobb, California · 14365 days ago · 1 km deep · 1 km away
  39. 2.19 km SE of Sea Ranch, California · 14365 days ago · -1 km deep · 56 km away
  40. 1.8Northern California · 14365 days ago · 9 km deep · 3 km away
  41. 1.75 km SW of Cobb, California · 14365 days ago · 5 km deep · 1 km away
  42. 1.85 km SW of Cobb, California · 14365 days ago · 4 km deep · 2 km away
  43. 1.56 km WSW of Cobb, California · 14365 days ago · 3 km deep · 3 km away
  44. 2.07 km W of Cobb, California · 14364 days ago · 1 km deep · 5 km away
  45. 2.28 km WSW of Cobb, California · 14364 days ago · 2 km deep · 5 km away
  46. 1.77 km WSW of Cobb, California · 14364 days ago · 3 km deep · 3 km away
  47. 1.511 km N of Brooktrails, California · 14364 days ago · 7 km deep · 99 km away
  48. 2.07 km W of Cobb, California · 14364 days ago · 1 km deep · 5 km away
  49. 1.65 km W of Cobb, California · 14363 days ago · 2 km deep · 4 km away
  50. 1.63 km W of Cobb, California · 14363 days ago · 0 km deep · 4 km away
  51. 2.67 km W of Cobb, California · 14363 days ago · 1 km deep · 4 km away
  52. 1.610 km SE of Sea Ranch, California · 14363 days ago · 4 km deep · 54 km away
  53. 1.75 km WNW of Cobb, California · 14363 days ago · 1 km deep · 5 km away
  54. 2.17 km WSW of Cobb, California · 14363 days ago · 1 km deep · 3 km away
  55. 1.75 km WSW of Cobb, California · 14363 days ago · 0 km deep · 1 km away
  56. 1.65 km SW of Cobb, California · 14363 days ago · -1 km deep · 1 km away
  57. 3.35 km WSW of Cobb, California · 14363 days ago · 1 km deep · 1 km away
  58. 2.06 km SW of Cobb, California · 14363 days ago · -1 km deep · 2 km away
  59. 2.95 km WSW of Cobb, California · 14363 days ago · -1 km deep · 1 km away
  60. 1.65 km SW of Cobb, California · 14363 days ago · 0 km deep · 1 km away

The first 60 of 177.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc99345. Read Tue, Sep 22, 2026, 11:28 PM UTC.