California earthquakes

M1.9 earthquake 4 km WSW of Cobb, California

A magnitude 1.9 earthquake struck 4 km WSW of Cobb, California on Mon, Apr 6, 1987, 6:45 PM PDT (01:45 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M2.1 5 km WNW 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
1987-04-07 01:45:54 UTC
Depth
1.8 km (1.1 mi), shallow
Epicenter
38.806° N, 122.776° 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, 1.4 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
70°
Stations used
16

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. 2.15 km WNW of Cobb, California · 14397 days ago · 0 km deep · 3 km away
  2. 1.65 km W of Cobb, California · 14397 days ago · 1 km deep · 2 km away
  3. 1.65 km W of Cobb, California · 14396 days ago · -1 km deep · 2 km away
  4. 2.47 km WSW of Cobb, California · 14396 days ago · 1 km deep · 2 km away
  5. 2.2Northern California · 14396 days ago · 2 km deep · 5 km away
  6. 1.56 km W of Cobb, California · 14396 days ago · 1 km deep · 2 km away
  7. 1.75 km WNW of Cobb, California · 14396 days ago · 1 km deep · 3 km away
  8. 1.85 km WNW of Cobb, California · 14395 days ago · 1 km deep · 3 km away
  9. 2.85 km SW of Cobb, California · 14395 days ago · 2 km deep · 2 km away
  10. 1.86 km W of Cobb, California · 14395 days ago · 3 km deep · 2 km away
  11. 2.10 km SSW of Kelseyville, California · 14395 days ago · 4 km deep · 20 km away
  12. 1.70 km SSW of Kelseyville, California · 14395 days ago · 4 km deep · 20 km away
  13. 1.60 km N of Kelseyville, California · 14395 days ago · 4 km deep · 20 km away
  14. 2.7Northern California · 14395 days ago · 4 km deep · 20 km away
  15. 2.0Northern California · 14395 days ago · 4 km deep · 20 km away
  16. 1.80 km N of Kelseyville, California · 14395 days ago · 3 km deep · 20 km away
  17. 2.80 km WSW of Kelseyville, California · 14395 days ago · 3 km deep · 20 km away
  18. 1.70 km WSW of Kelseyville, California · 14395 days ago · 4 km deep · 20 km away
  19. 2.8Northern California · 14394 days ago · 4 km deep · 20 km away
  20. 1.80 km N of Kelseyville, California · 14394 days ago · 3 km deep · 20 km away
  21. 1.70 km NNW of Kelseyville, California · 14394 days ago · 2 km deep · 20 km away
  22. 1.77 km WSW of Cobb, California · 14394 days ago · 3 km deep · 3 km away
  23. 1.615 km ENE of Potter Valley, California · 14394 days ago · 6 km deep · 64 km away
  24. 2.15 km WSW of Cobb, California · 14394 days ago · 4 km deep · 1 km away
  25. 2.54 km SW of Cobb, California · 14394 days ago · 0 km deep · 1 km away
  26. 1.74 km W of Cobb, California · 14394 days ago · -1 km deep · 1 km away
  27. 2.90 km ENE of Kelseyville, California · 14394 days ago · 4 km deep · 20 km away
  28. 1.90 km WNW of Kelseyville, California · 14393 days ago · 3 km deep · 20 km away
  29. 1.60 km ENE of Kelseyville, California · 14393 days ago · 4 km deep · 20 km away
  30. 1.87 km NE of Upper Lake, California · 14393 days ago · 6 km deep · 46 km away
  31. 2.16 km W of Cobb, California · 14393 days ago · 3 km deep · 2 km away
  32. 1.65 km W of Cobb, California · 14393 days ago · 2 km deep · 2 km away
  33. 1.78 km WSW of Cobb, California · 14391 days ago · 0 km deep · 3 km away
  34. 1.97 km WSW of Kenwood, California · 14391 days ago · 2 km deep · 48 km away
  35. 1.56 km WSW of Cobb, California · 14390 days ago · 3 km deep · 2 km away
  36. 1.96 km WSW of Cobb, California · 14390 days ago · 3 km deep · 2 km away
  37. 1.76 km WNW of Kenwood, California · 14390 days ago · 5 km deep · 44 km away
  38. 1.77 km W of Kenwood, California · 14390 days ago · 6 km deep · 44 km away
  39. 1.57 km WSW of Cobb, California · 14389 days ago · 3 km deep · 3 km away
  40. 2.010 km WNW of Bolinas, California · 14389 days ago · 6 km deep · 94 km away
  41. 1.715 km E of Comptche, California · 14388 days ago · 3 km deep · 75 km away
  42. 2.27 km W of Cobb, California · 14388 days ago · 3 km deep · 3 km away
  43. 2.212 km NNE of Angwin, California · 14388 days ago · 8 km deep · 37 km away
  44. 1.76 km W of Cobb, California · 14388 days ago · 3 km deep · 3 km away
  45. 2.38 km SSW of Calistoga, California · 14388 days ago · 6 km deep · 36 km away
  46. 1.77 km W of Cobb, California · 14388 days ago · 3 km deep · 3 km away
  47. 2.05 km W of Cobb, California · 14386 days ago · 0 km deep · 2 km away
  48. 1.66 km W of Cobb, California · 14386 days ago · 3 km deep · 2 km away
  49. 2.54 km WSW of Cobb, California · 14386 days ago · 1 km deep · 1 km away
  50. 1.58 km WSW of Cobb, California · 14386 days ago · 3 km deep · 3 km away
  51. 1.56 km SW of Cobb, California · 14385 days ago · 0 km deep · 2 km away
  52. 2.55 km SW of Cobb, California · 14385 days ago · -1 km deep · 2 km away
  53. 2.66 km W of Cobb, California · 14384 days ago · 3 km deep · 2 km away
  54. 1.55 km W of Cobb, California · 14384 days ago · 0 km deep · 2 km away
  55. 1.75 km WSW of Hopland, California · 14384 days ago · 5 km deep · 38 km away
  56. 1.97 km WSW of Cobb, California · 14384 days ago · -1 km deep · 2 km away
  57. 3.55 km W of Cobb, California · 14383 days ago · 4 km deep · 2 km away
  58. 2.012 km N of Comptche, California · 14383 days ago · 2 km deep · 96 km away
  59. 3.04 km WNW of Cobb, California · 14382 days ago · 2 km deep · 4 km away
  60. 1.77 km WSW of Calistoga, California · 14382 days ago · 0 km deep · 30 km away

The first 60 of 178.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc98059. Read Tue, Sep 22, 2026, 10:27 PM UTC.