California earthquakes

M1.8 earthquake 7 km WSW of Cobb, California

A magnitude 1.8 earthquake struck 7 km WSW of Cobb, California on Sat, Aug 15, 1987, 4:55 AM PDT (11:55 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M2.4 5 km SW 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
1987-08-15 11:55:17 UTC
Depth
1.6 km (1.0 mi), shallow
Epicenter
38.800° N, 122.799° 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 0.8 km horizontally, 10.2 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
167°
Stations used
5

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 161 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.64 km S of Cobb, California · 14274 days ago · -1 km deep · 6 km away
  2. 2.45 km SW of Cobb, California · 14274 days ago · 0 km deep · 4 km away
  3. 1.82 km WNW of Brooktrails, California · 14274 days ago · 2 km deep · 90 km away
  4. 1.86 km NE of Brooktrails, California · 14274 days ago · 5 km deep · 89 km away
  5. 1.79 km W of Cobb, California · 14272 days ago · -1 km deep · 3 km away
  6. 2.16 km E of Hidden Valley Lake, California · 14272 days ago · 14 km deep · 27 km away
  7. 2.18 km W of Cobb, California · 14272 days ago · 0 km deep · 4 km away
  8. 1.88 km W of Cobb, California · 14272 days ago · 0 km deep · 3 km away
  9. 2.38 km WSW of Cobb, California · 14271 days ago · 2 km deep · 2 km away
  10. 2.56 km W of Cobb, California · 14270 days ago · 1 km deep · 2 km away
  11. 2.26 km W of Cobb, California · 14270 days ago · 3 km deep · 2 km away
  12. 1.7Northern California · 14270 days ago · 0 km deep · 3 km away
  13. 2.37 km WSW of Cobb, California · 14270 days ago · 1 km deep · 1 km away
  14. 2.028 km NNE of Potter Valley, California · 14269 days ago · 13 km deep · 86 km away
  15. 2.05 km WNW of Cobb, California · 14268 days ago · 2 km deep · 4 km away
  16. 1.65 km SSW of Cobb, California · 14268 days ago · 0 km deep · 4 km away
  17. 2.14 km W of Cobb, California · 14268 days ago · 0 km deep · 3 km away
  18. 1.97 km W of Cobb, California · 14268 days ago · 3 km deep · 2 km away
  19. 2.05 km SSE of Kelseyville, California · 14266 days ago · 0 km deep · 15 km away
  20. 3.08 km W of Cobb, California · 14266 days ago · 1 km deep · 2 km away
  21. 2.06 km NNE of Penngrove, California · 14266 days ago · 4 km deep · 52 km away
  22. 1.76 km W of Cobb, California · 14266 days ago · 1 km deep · 3 km away
  23. 1.76 km W of Cobb, California · 14266 days ago · 3 km deep · 2 km away
  24. 1.87 km WSW of Cobb, California · 14265 days ago · 4 km deep · 1 km away
  25. 1.65 km SW of Cobb, California · 14265 days ago · -1 km deep · 3 km away
  26. 1.83 km NNW of Cloverdale, California · 14265 days ago · -1 km deep · 20 km away
  27. 1.67 km W of Cobb, California · 14265 days ago · 0 km deep · 3 km away
  28. 1.57 km WSW of Cobb, California · 14265 days ago · 1 km deep · 0 km away
  29. 1.97 km WSW of Cobb, California · 14265 days ago · 4 km deep · 1 km away
  30. 1.56 km W of Cobb, California · 14264 days ago · 3 km deep · 2 km away
  31. 2.026 km NNE of Potter Valley, California · 14264 days ago · 4 km deep · 85 km away
  32. 2.04 km W of Cobb, California · 14264 days ago · 0 km deep · 3 km away
  33. 2.05 km W of Cobb, California · 14263 days ago · 0 km deep · 3 km away
  34. 1.85 km W of Cobb, California · 14263 days ago · 0 km deep · 3 km away
  35. 1.79 km WNW of Cobb, California · 14262 days ago · 0 km deep · 6 km away
  36. 2.71 km E of Willits, California · 14262 days ago · 5 km deep · 82 km away
  37. 1.824 km NNE of Potter Valley, California · 14261 days ago · 6 km deep · 82 km away
  38. 2.06 km W of Cobb, California · 14261 days ago · -1 km deep · 3 km away
  39. 1.56 km W of Cobb, California · 14261 days ago · 3 km deep · 2 km away
  40. 1.77 km W of Cobb, California · 14261 days ago · 0 km deep · 3 km away
  41. 2.38 km W of Cobb, California · 14260 days ago · 1 km deep · 2 km away
  42. 2.36 km WSW of Cobb, California · 14259 days ago · 1 km deep · 1 km away
  43. 1.85 km SW of Cobb, California · 14259 days ago · 0 km deep · 2 km away
  44. 1.64 km SW of Cobb, California · 14258 days ago · 1 km deep · 3 km away
  45. 1.54 km WNW of Cobb, California · 14258 days ago · 2 km deep · 4 km away
  46. 1.96 km SW of Cobb, California · 14258 days ago · 2 km deep · 3 km away
  47. 2.06 km WSW of Cobb, California · 14257 days ago · 3 km deep · 1 km away
  48. 1.96 km SW of Middletown, California · 14257 days ago · 4 km deep · 14 km away
  49. 1.65 km SW of Cobb, California · 14257 days ago · 0 km deep · 4 km away
  50. 1.73 km WNW of Cobb, California · 14257 days ago · 0 km deep · 5 km away
  51. 2.16 km W of Cobb, California · 14257 days ago · 3 km deep · 2 km away
  52. 2.86 km W of Cobb, California · 14257 days ago · 3 km deep · 2 km away
  53. 1.66 km W of Cobb, California · 14257 days ago · 3 km deep · 2 km away
  54. 1.76 km W of Cobb, California · 14257 days ago · 4 km deep · 3 km away
  55. 1.54 km SW of Cobb, California · 14256 days ago · 0 km deep · 4 km away
  56. 2.410 km W of Cobb, California · 14256 days ago · 1 km deep · 4 km away
  57. 1.64 km SW of Cobb, California · 14256 days ago · 0 km deep · 4 km away
  58. 1.58 km NW of Redwood Valley, California · 14255 days ago · 4 km deep · 71 km away
  59. 2.07 km W of Cobb, California · 14255 days ago · 3 km deep · 2 km away
  60. 1.96 km WSW of Cobb, California · 14255 days ago · 3 km deep · 1 km away

The first 60 of 161.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1152011. Read Wed, Sep 23, 2026, 3:35 AM UTC.