California earthquakes

M2.1 earthquake 5 km WSW of Cobb, California

A magnitude 2.1 earthquake struck 5 km WSW of Cobb, California on Sun, Apr 26, 1987, 9:52 PM PDT (04:52 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.5 5 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
2.1 (md), micro
Local time
UTC
1987-04-27 04:52:07 UTC
Depth
3.8 km (2.4 mi), shallow
Epicenter
38.798° N, 122.783° 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
±0.11
Depth from
From location
Station coverage gap
38°
Stations used
31

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 176 in the 60 days after this one and 114 in the 30 days before it.

After

  1. 2.54 km SW of Cobb, California · 14401 days ago · 0 km deep · 1 km away
  2. 1.74 km W of Cobb, California · 14401 days ago · -1 km deep · 2 km away
  3. 2.90 km ENE of Kelseyville, California · 14401 days ago · 4 km deep · 21 km away
  4. 1.90 km WNW of Kelseyville, California · 14401 days ago · 3 km deep · 21 km away
  5. 1.60 km ENE of Kelseyville, California · 14401 days ago · 4 km deep · 21 km away
  6. 1.87 km NE of Upper Lake, California · 14401 days ago · 6 km deep · 46 km away
  7. 2.16 km W of Cobb, California · 14400 days ago · 3 km deep · 3 km away
  8. 1.65 km W of Cobb, California · 14400 days ago · 2 km deep · 3 km away
  9. 1.78 km WSW of Cobb, California · 14398 days ago · 0 km deep · 3 km away
  10. 1.97 km WSW of Kenwood, California · 14398 days ago · 2 km deep · 47 km away
  11. 1.56 km WSW of Cobb, California · 14398 days ago · 3 km deep · 2 km away
  12. 1.96 km WSW of Cobb, California · 14398 days ago · 3 km deep · 2 km away
  13. 1.76 km WNW of Kenwood, California · 14397 days ago · 5 km deep · 44 km away
  14. 1.77 km W of Kenwood, California · 14397 days ago · 6 km deep · 43 km away
  15. 1.57 km WSW of Cobb, California · 14396 days ago · 3 km deep · 2 km away
  16. 2.010 km WNW of Bolinas, California · 14396 days ago · 6 km deep · 93 km away
  17. 1.715 km E of Comptche, California · 14396 days ago · 3 km deep · 75 km away
  18. 2.27 km W of Cobb, California · 14396 days ago · 3 km deep · 3 km away
  19. 2.212 km NNE of Angwin, California · 14395 days ago · 8 km deep · 37 km away
  20. 1.76 km W of Cobb, California · 14395 days ago · 3 km deep · 3 km away
  21. 2.38 km SSW of Calistoga, California · 14395 days ago · 6 km deep · 35 km away
  22. 1.77 km W of Cobb, California · 14395 days ago · 3 km deep · 3 km away
  23. 2.05 km W of Cobb, California · 14394 days ago · 0 km deep · 3 km away
  24. 1.66 km W of Cobb, California · 14393 days ago · 3 km deep · 2 km away
  25. 2.54 km WSW of Cobb, California · 14393 days ago · 1 km deep · 1 km away
  26. 1.58 km WSW of Cobb, California · 14393 days ago · 3 km deep · 3 km away
  27. 1.56 km SW of Cobb, California · 14392 days ago · 0 km deep · 2 km away
  28. 2.55 km SW of Cobb, California · 14392 days ago · -1 km deep · 2 km away
  29. 2.66 km W of Cobb, California · 14392 days ago · 3 km deep · 3 km away
  30. 1.55 km W of Cobb, California · 14391 days ago · 0 km deep · 3 km away
  31. 1.75 km WSW of Hopland, California · 14391 days ago · 5 km deep · 38 km away
  32. 1.97 km WSW of Cobb, California · 14391 days ago · -1 km deep · 2 km away
  33. 3.55 km W of Cobb, California · 14390 days ago · 4 km deep · 3 km away
  34. 2.012 km N of Comptche, California · 14390 days ago · 2 km deep · 96 km away
  35. 3.04 km WNW of Cobb, California · 14390 days ago · 2 km deep · 5 km away
  36. 1.77 km WSW of Calistoga, California · 14389 days ago · 0 km deep · 30 km away
  37. 1.74 km WSW of Cobb, California · 14389 days ago · 0 km deep · 2 km away
  38. 2.29 km WSW of Cobb, California · 14389 days ago · 1 km deep · 4 km away
  39. 2.04 km WNW of Potter Valley, California · 14389 days ago · 0 km deep · 68 km away
  40. 1.65 km SSW of Cobb, California · 14389 days ago · 0 km deep · 3 km away
  41. 1.619 km N of Upper Lake, California · 14388 days ago · 4 km deep · 61 km away
  42. 1.56 km W of Cobb, California · 14388 days ago · 0 km deep · 3 km away
  43. 1.85 km W of Cobb, California · 14388 days ago · 1 km deep · 3 km away
  44. 1.6Northern California · 14388 days ago · 0 km deep · 4 km away
  45. 1.67 km WSW of Cobb, California · 14387 days ago · 3 km deep · 2 km away
  46. 1.918 km NE of Upper Lake, California · 14387 days ago · 8 km deep · 54 km away
  47. 1.74 km SW of Cobb, California · 14387 days ago · -1 km deep · 1 km away
  48. 2.08 km W of Cobb, California · 14386 days ago · 1 km deep · 4 km away
  49. 2.54 km SW of Glen Ellen, California · 14385 days ago · 6 km deep · 55 km away
  50. 1.78 km WNW of Cobb, California · 14385 days ago · 3 km deep · 6 km away
  51. 1.88 km W of Cobb, California · 14385 days ago · 1 km deep · 4 km away
  52. 1.714 km ESE of Hidden Valley Lake, California · 14384 days ago · 1 km deep · 32 km away
  53. 2.220 km NE of Potter Valley, California · 14384 days ago · 7 km deep · 72 km away
  54. 2.14 km SW of Glen Ellen, California · 14384 days ago · 6 km deep · 55 km away
  55. 2.14 km SW of Glen Ellen, California · 14384 days ago · 6 km deep · 55 km away
  56. 2.25 km W of Cobb, California · 14384 days ago · 1 km deep · 3 km away
  57. 1.66 km W of Cobb, California · 14384 days ago · 3 km deep · 3 km away
  58. 2.02 km SE of Larkfield-Wikiup, California · 14383 days ago · 4 km deep · 33 km away
  59. 1.84 km WSW of Cobb, California · 14383 days ago · 1 km deep · 1 km away
  60. 2.05 km WNW of Cobb, California · 14383 days ago · 3 km deep · 4 km away

The first 60 of 176.

Before

  1. 1.615 km ENE of Potter Valley, California · 14401 days ago · 6 km deep · 64 km away
  2. 1.77 km WSW of Cobb, California · 14401 days ago · 3 km deep · 3 km away
  3. 1.70 km NNW of Kelseyville, California · 14402 days ago · 2 km deep · 21 km away
  4. 1.80 km N of Kelseyville, California · 14402 days ago · 3 km deep · 21 km away
  5. 2.8Northern California · 14402 days ago · 4 km deep · 20 km away
  6. 1.70 km WSW of Kelseyville, California · 14402 days ago · 4 km deep · 21 km away
  7. 2.80 km WSW of Kelseyville, California · 14402 days ago · 3 km deep · 21 km away
  8. 1.80 km N of Kelseyville, California · 14402 days ago · 3 km deep · 21 km away
  9. 2.0Northern California · 14402 days ago · 4 km deep · 21 km away
  10. 2.7Northern California · 14402 days ago · 4 km deep · 21 km away
  11. 1.60 km N of Kelseyville, California · 14402 days ago · 4 km deep · 21 km away
  12. 1.70 km SSW of Kelseyville, California · 14402 days ago · 4 km deep · 20 km away
  13. 2.10 km SSW of Kelseyville, California · 14402 days ago · 4 km deep · 20 km away
  14. 1.86 km W of Cobb, California · 14402 days ago · 3 km deep · 2 km away
  15. 2.85 km SW of Cobb, California · 14402 days ago · 2 km deep · 2 km away
  16. 1.85 km WNW of Cobb, California · 14403 days ago · 1 km deep · 4 km away
  17. 1.75 km WNW of Cobb, California · 14403 days ago · 1 km deep · 4 km away
  18. 1.56 km W of Cobb, California · 14403 days ago · 1 km deep · 2 km away
  19. 2.2Northern California · 14404 days ago · 2 km deep · 4 km away
  20. 2.47 km WSW of Cobb, California · 14404 days ago · 1 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc99302. Read Wed, Sep 30, 2026, 3:03 AM UTC.