California earthquakes

M1.8 earthquake 6 km W of Cobb, California

A magnitude 1.8 earthquake struck 6 km W of Cobb, California on Fri, Mar 27, 1987, 9:49 PM PST (05:49 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.6 6 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
1.8 (md), micro
Local time
UTC
1987-03-28 05:49:09 UTC
Depth
3.1 km (1.9 mi), shallow
Epicenter
38.819° N, 122.795° 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, 0.7 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
46°
Stations used
13

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 174 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.720 km ENE of Potter Valley, California · 14411 days ago · 7 km deep · 65 km away
  2. 1.67 km ENE of Talmage, California · 14411 days ago · 4 km deep · 46 km away
  3. 1.64 km WSW of Cobb, California · 14410 days ago · 2 km deep · 2 km away
  4. 2.66 km W of Cobb, California · 14409 days ago · 3 km deep · 0 km away
  5. 2.47 km W of Cobb, California · 14409 days ago · 1 km deep · 2 km away
  6. 1.95 km W of Cobb, California · 14408 days ago · 1 km deep · 1 km away
  7. 2.16 km W of Cobb, California · 14408 days ago · 4 km deep · 1 km away
  8. 1.9Northern California · 14408 days ago · 0 km deep · 2 km away
  9. 1.86 km W of Cobb, California · 14408 days ago · 3 km deep · 0 km away
  10. 1.62 km ESE of Calpella, California · 14407 days ago · 5 km deep · 56 km away
  11. 1.97 km W of Cobb, California · 14407 days ago · 4 km deep · 1 km away
  12. 1.87 km W of Cobb, California · 14407 days ago · 4 km deep · 1 km away
  13. 2.06 km SW of Cobb, California · 14406 days ago · 3 km deep · 4 km away
  14. 1.67 km W of Cobb, California · 14406 days ago · 3 km deep · 2 km away
  15. 1.65 km SW of Cobb, California · 14406 days ago · 0 km deep · 5 km away
  16. 1.66 km W of Cobb, California · 14406 days ago · 2 km deep · 1 km away
  17. 1.87 km WSW of Cobb, California · 14405 days ago · 1 km deep · 2 km away
  18. 1.95 km SSW of Cobb, California · 14405 days ago · 0 km deep · 5 km away
  19. 1.67 km W of Cobb, California · 14405 days ago · 1 km deep · 2 km away
  20. 1.83 km W of Cobb, California · 14405 days ago · 1 km deep · 3 km away
  21. 1.86 km SW of Cobb, California · 14405 days ago · 2 km deep · 3 km away
  22. 2.16 km W of Cobb, California · 14405 days ago · 3 km deep · 0 km away
  23. 2.14 km SW of Cobb, California · 14404 days ago · 0 km deep · 4 km away
  24. 2.25 km W of Cobb, California · 14404 days ago · 1 km deep · 2 km away
  25. 1.65 km SW of Cobb, California · 14404 days ago · -1 km deep · 5 km away
  26. 1.54 km SW of Cobb, California · 14404 days ago · 0 km deep · 4 km away
  27. 1.79 km WNW of Cobb, California · 14403 days ago · 1 km deep · 4 km away
  28. 1.76 km W of Cobb, California · 14402 days ago · 2 km deep · 1 km away
  29. 1.64 km SW of Cobb, California · 14402 days ago · 0 km deep · 5 km away
  30. 2.35 km SW of Cobb, California · 14402 days ago · 1 km deep · 4 km away
  31. 1.513 km NNE of Angwin, California · 14401 days ago · 4 km deep · 38 km away
  32. 1.76 km WSW of Cobb, California · 14400 days ago · 4 km deep · 2 km away
  33. 2.27 km WSW of Cobb, California · 14400 days ago · 1 km deep · 2 km away
  34. 2.38 km WSW of Cobb, California · 14400 days ago · 1 km deep · 3 km away
  35. 2.86 km W of Cobb, California · 14400 days ago · 2 km deep · 1 km away
  36. 2.17 km W of Cobb, California · 14399 days ago · 3 km deep · 1 km away
  37. 1.512 km NE of Lucerne, California · 14399 days ago · 13 km deep · 41 km away
  38. 1.811 km NNE of Geyserville, California · 14399 days ago · 3 km deep · 5 km away
  39. 1.77 km W of Cobb, California · 14399 days ago · 3 km deep · 2 km away
  40. 1.76 km W of Cobb, California · 14399 days ago · 4 km deep · 0 km away
  41. 1.84 km W of Moskowite Corner, California · 14398 days ago · 7 km deep · 64 km away
  42. 1.76 km WSW of Cobb, California · 14398 days ago · 1 km deep · 1 km away
  43. 1.87 km W of Cobb, California · 14397 days ago · 3 km deep · 1 km away
  44. 1.74 km SSW of Cobb, California · 14397 days ago · -1 km deep · 6 km away
  45. 2.15 km WNW of Cobb, California · 14397 days ago · 0 km deep · 2 km away
  46. 1.65 km W of Cobb, California · 14397 days ago · 1 km deep · 1 km away
  47. 1.65 km W of Cobb, California · 14396 days ago · -1 km deep · 1 km away
  48. 2.47 km WSW of Cobb, California · 14396 days ago · 1 km deep · 1 km away
  49. 2.2Northern California · 14396 days ago · 2 km deep · 4 km away
  50. 1.56 km W of Cobb, California · 14396 days ago · 1 km deep · 1 km away
  51. 1.75 km WNW of Cobb, California · 14396 days ago · 1 km deep · 2 km away
  52. 1.85 km WNW of Cobb, California · 14395 days ago · 1 km deep · 2 km away
  53. 2.85 km SW of Cobb, California · 14395 days ago · 2 km deep · 4 km away
  54. 1.86 km W of Cobb, California · 14395 days ago · 3 km deep · 0 km away
  55. 2.10 km SSW of Kelseyville, California · 14395 days ago · 4 km deep · 18 km away
  56. 1.70 km SSW of Kelseyville, California · 14395 days ago · 4 km deep · 18 km away
  57. 1.60 km N of Kelseyville, California · 14395 days ago · 4 km deep · 18 km away
  58. 2.7Northern California · 14394 days ago · 4 km deep · 18 km away
  59. 2.0Northern California · 14394 days ago · 4 km deep · 18 km away
  60. 1.80 km N of Kelseyville, California · 14394 days ago · 3 km deep · 18 km away

The first 60 of 174.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1148613. Read Tue, Sep 22, 2026, 8:10 PM UTC.