California earthquakes

M1.9 earthquake 6 km WSW of Cobb, California

A magnitude 1.9 earthquake struck 6 km WSW of Cobb, California on Thu, Apr 30, 1987, 8:11 AM PDT (15:11 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.5 8 km W 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
1.9 (md), micro
Local time
UTC
1987-04-30 15:11:27 UTC
Depth
2.8 km (1.7 mi), shallow
Epicenter
38.809° N, 122.797° 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, 0.4 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
47°
Stations used
17

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 178 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.710 km NW of Cobb, California · 14373 days ago · 0 km deep · 8 km away
  2. 2.58 km W of Cobb, California · 14372 days ago · 1 km deep · 2 km away
  3. 1.78 km W of Cobb, California · 14372 days ago · 4 km deep · 3 km away
  4. 2.04 km W of Cobb, California · 14372 days ago · 0 km deep · 2 km away
  5. 2.86 km W of Cobb, California · 14372 days ago · 3 km deep · 1 km away
  6. 1.69 km W of Cobb, California · 14371 days ago · 0 km deep · 3 km away
  7. 1.95 km WSW of Cobb, California · 14371 days ago · 1 km deep · 2 km away
  8. 1.68 km W of Cobb, California · 14370 days ago · -1 km deep · 2 km away
  9. 1.56 km W of Cobb, California · 14370 days ago · 3 km deep · 2 km away
  10. 1.65 km W of Cobb, California · 14370 days ago · -1 km deep · 2 km away
  11. 1.5Northern California · 14370 days ago · 8 km deep · 29 km away
  12. 1.86 km SSE of Cottonwood, California · 14370 days ago · 0 km deep · 78 km away
  13. 1.56 km W of Cobb, California · 14370 days ago · 4 km deep · 2 km away
  14. 1.67 km WSW of Cobb, California · 14369 days ago · 1 km deep · 1 km away
  15. 1.65 km N of Winters, California · 14369 days ago · 1 km deep · 76 km away
  16. 2.11 km NNW of Winters, California · 14369 days ago · 2 km deep · 77 km away
  17. 2.14 km W of Cobb, California · 14368 days ago · 0 km deep · 2 km away
  18. 1.86 km W of Cobb, California · 14368 days ago · 3 km deep · 1 km away
  19. 2.39 km W of Cobb, California · 14367 days ago · 0 km deep · 3 km away
  20. 1.78 km W of Cobb, California · 14367 days ago · -1 km deep · 3 km away
  21. 1.86 km W of Cobb, California · 14366 days ago · 3 km deep · 1 km away
  22. 2.09 km W of Cobb, California · 14366 days ago · 0 km deep · 3 km away
  23. 1.6Northern California · 14366 days ago · 4 km deep · 9 km away
  24. 1.85 km WSW of Cobb, California · 14366 days ago · 1 km deep · 2 km away
  25. 2.19 km SE of Sea Ranch, California · 14366 days ago · -1 km deep · 54 km away
  26. 1.8Northern California · 14366 days ago · 9 km deep · 6 km away
  27. 1.75 km SW of Cobb, California · 14366 days ago · 5 km deep · 4 km away
  28. 1.85 km SW of Cobb, California · 14366 days ago · 4 km deep · 5 km away
  29. 1.56 km WSW of Cobb, California · 14365 days ago · 3 km deep · 0 km away
  30. 2.07 km W of Cobb, California · 14365 days ago · 1 km deep · 2 km away
  31. 2.28 km WSW of Cobb, California · 14364 days ago · 2 km deep · 2 km away
  32. 1.77 km WSW of Cobb, California · 14364 days ago · 3 km deep · 1 km away
  33. 1.511 km N of Brooktrails, California · 14364 days ago · 7 km deep · 97 km away
  34. 2.07 km W of Cobb, California · 14364 days ago · 1 km deep · 3 km away
  35. 1.65 km W of Cobb, California · 14364 days ago · 2 km deep · 2 km away
  36. 1.63 km W of Cobb, California · 14364 days ago · 0 km deep · 3 km away
  37. 2.67 km W of Cobb, California · 14364 days ago · 1 km deep · 1 km away
  38. 1.610 km SE of Sea Ranch, California · 14364 days ago · 4 km deep · 52 km away
  39. 1.75 km WNW of Cobb, California · 14364 days ago · 1 km deep · 3 km away
  40. 2.17 km WSW of Cobb, California · 14364 days ago · 1 km deep · 1 km away
  41. 1.75 km WSW of Cobb, California · 14363 days ago · 0 km deep · 2 km away
  42. 1.65 km SW of Cobb, California · 14363 days ago · -1 km deep · 3 km away
  43. 3.35 km WSW of Cobb, California · 14363 days ago · 1 km deep · 2 km away
  44. 2.06 km SW of Cobb, California · 14363 days ago · -1 km deep · 2 km away
  45. 2.95 km WSW of Cobb, California · 14363 days ago · -1 km deep · 2 km away
  46. 1.65 km SW of Cobb, California · 14363 days ago · 0 km deep · 2 km away
  47. 1.66 km SW of Cobb, California · 14363 days ago · 1 km deep · 4 km away
  48. 1.716 km NNE of Upper Lake, California · 14363 days ago · 4 km deep · 54 km away
  49. 1.77 km WSW of Cobb, California · 14363 days ago · 4 km deep · 2 km away
  50. 2.44 km WNW of Cobb, California · 14363 days ago · 0 km deep · 3 km away
  51. 2.36 km WSW of Cobb, California · 14363 days ago · 4 km deep · 0 km away
  52. 1.94 km WNW of Cobb, California · 14362 days ago · 0 km deep · 4 km away
  53. 1.75 km SW of Cobb, California · 14362 days ago · 2 km deep · 3 km away
  54. 1.64 km SW of Cobb, California · 14362 days ago · -1 km deep · 3 km away
  55. 2.25 km W of Cobb, California · 14362 days ago · 1 km deep · 3 km away
  56. 3.34 km WNW of Cobb, California · 14362 days ago · 2 km deep · 4 km away
  57. 1.84 km SW of Hopland, California · 14361 days ago · 5 km deep · 35 km away
  58. 1.68 km W of Cobb, California · 14361 days ago · 1 km deep · 3 km away
  59. 1.614 km ENE of Angwin, California · 14361 days ago · -1 km deep · 49 km away
  60. 2.45 km W of Cobb, California · 14361 days ago · 1 km deep · 2 km away

The first 60 of 178.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc99521. Read Wed, Sep 23, 2026, 12:59 PM UTC.