California earthquakes

M1.5 earthquake 7 km WSW of Cobb, California

A magnitude 1.5 earthquake struck 7 km WSW of Cobb, California on Wed, Sep 2, 1987, 7:45 PM PDT (02:45 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.4 4 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
1.5 (md), micro
Local time
UTC
1987-09-03 02:45:16 UTC
Depth
1.1 km (0.7 mi), shallow
Epicenter
38.800° N, 122.803° 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 0.3 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
77°
Stations used
8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 159 in the 60 days after this one and 100 in the 30 days before it.

After

  1. 1.97 km WSW of Cobb, California · 14268 days ago · 4 km deep · 0 km away
  2. 1.56 km W of Cobb, California · 14268 days ago · 3 km deep · 2 km away
  3. 2.026 km NNE of Potter Valley, California · 14268 days ago · 4 km deep · 85 km away
  4. 2.04 km W of Cobb, California · 14268 days ago · 0 km deep · 3 km away
  5. 2.05 km W of Cobb, California · 14267 days ago · 0 km deep · 3 km away
  6. 1.85 km W of Cobb, California · 14267 days ago · 0 km deep · 3 km away
  7. 1.79 km WNW of Cobb, California · 14266 days ago · 0 km deep · 6 km away
  8. 2.71 km E of Willits, California · 14266 days ago · 5 km deep · 82 km away
  9. 1.824 km NNE of Potter Valley, California · 14265 days ago · 6 km deep · 82 km away
  10. 2.06 km W of Cobb, California · 14265 days ago · -1 km deep · 3 km away
  11. 1.56 km W of Cobb, California · 14265 days ago · 3 km deep · 2 km away
  12. 1.77 km W of Cobb, California · 14264 days ago · 0 km deep · 3 km away
  13. 2.38 km W of Cobb, California · 14264 days ago · 1 km deep · 2 km away
  14. 2.36 km WSW of Cobb, California · 14263 days ago · 1 km deep · 1 km away
  15. 1.85 km SW of Cobb, California · 14263 days ago · 0 km deep · 3 km away
  16. 1.64 km SW of Cobb, California · 14262 days ago · 1 km deep · 3 km away
  17. 1.54 km WNW of Cobb, California · 14262 days ago · 2 km deep · 5 km away
  18. 1.96 km SW of Cobb, California · 14262 days ago · 2 km deep · 3 km away
  19. 2.06 km WSW of Cobb, California · 14261 days ago · 3 km deep · 1 km away
  20. 1.96 km SW of Middletown, California · 14261 days ago · 4 km deep · 14 km away
  21. 1.65 km SW of Cobb, California · 14261 days ago · 0 km deep · 4 km away
  22. 1.73 km WNW of Cobb, California · 14261 days ago · 0 km deep · 5 km away
  23. 2.16 km W of Cobb, California · 14261 days ago · 3 km deep · 2 km away
  24. 2.86 km W of Cobb, California · 14261 days ago · 3 km deep · 2 km away
  25. 1.66 km W of Cobb, California · 14261 days ago · 3 km deep · 2 km away
  26. 1.76 km W of Cobb, California · 14261 days ago · 4 km deep · 3 km away
  27. 1.54 km SW of Cobb, California · 14260 days ago · 0 km deep · 4 km away
  28. 2.410 km W of Cobb, California · 14260 days ago · 1 km deep · 4 km away
  29. 1.64 km SW of Cobb, California · 14260 days ago · 0 km deep · 4 km away
  30. 1.58 km NW of Redwood Valley, California · 14259 days ago · 4 km deep · 71 km away
  31. 2.07 km W of Cobb, California · 14259 days ago · 3 km deep · 2 km away
  32. 1.96 km WSW of Cobb, California · 14259 days ago · 3 km deep · 1 km away
  33. 1.76 km WSW of Cobb, California · 14258 days ago · 3 km deep · 1 km away
  34. 2.822 km NE of Potter Valley, California · 14258 days ago · 12 km deep · 74 km away
  35. 1.921 km NE of Potter Valley, California · 14258 days ago · 11 km deep · 74 km away
  36. 2.56 km SW of Cobb, California · 14258 days ago · 2 km deep · 3 km away
  37. 2.46 km WSW of Cobb, California · 14258 days ago · 0 km deep · 2 km away
  38. 1.58 km W of Cobb, California · 14258 days ago · -1 km deep · 4 km away
  39. 2.921 km NE of Potter Valley, California · 14258 days ago · 10 km deep · 75 km away
  40. 1.922 km NE of Potter Valley, California · 14258 days ago · 10 km deep · 75 km away
  41. 1.721 km NE of Potter Valley, California · 14258 days ago · 11 km deep · 75 km away
  42. 1.921 km NE of Potter Valley, California · 14258 days ago · 11 km deep · 75 km away
  43. 3.024 km NE of Potter Valley, California · 14258 days ago · -1 km deep · 75 km away
  44. 1.64 km W of Cobb, California · 14257 days ago · 0 km deep · 4 km away
  45. 1.63 km NNW of Cloverdale, California · 14257 days ago · -1 km deep · 20 km away
  46. 1.98 km WSW of Cobb, California · 14257 days ago · 3 km deep · 1 km away
  47. 1.95 km WSW of Cobb, California · 14256 days ago · 1 km deep · 2 km away
  48. 1.64 km W of Cobb, California · 14256 days ago · -1 km deep · 3 km away
  49. 1.86 km W of Cobb, California · 14256 days ago · 1 km deep · 1 km away
  50. 2.39 km SE of Sonoma, California · 14256 days ago · 7 km deep · 73 km away
  51. 2.15 km WSW of Cobb, California · 14255 days ago · 1 km deep · 2 km away
  52. 1.69 km WSW of Cobb, California · 14255 days ago · 0 km deep · 2 km away
  53. 1.94 km W of Cobb, California · 14255 days ago · 1 km deep · 4 km away
  54. 1.74 km W of Cobb, California · 14255 days ago · 0 km deep · 4 km away
  55. 1.52 km NNE of Cloverdale, California · 14255 days ago · 0 km deep · 18 km away
  56. 1.617 km N of Upper Lake, California · 14255 days ago · 1 km deep · 58 km away
  57. 1.65 km SW of Cobb, California · 14254 days ago · -1 km deep · 4 km away
  58. 2.018 km NE of Potter Valley, California · 14253 days ago · 6 km deep · 75 km away
  59. 1.76 km W of Cobb, California · 14253 days ago · 1 km deep · 3 km away
  60. 2.55 km SW of Cobb, California · 14253 days ago · 1 km deep · 3 km away

The first 60 of 159.

Before

  1. 1.67 km W of Cobb, California · 14269 days ago · 0 km deep · 2 km away
  2. 1.83 km NNW of Cloverdale, California · 14269 days ago · -1 km deep · 20 km away
  3. 1.65 km SW of Cobb, California · 14269 days ago · -1 km deep · 3 km away
  4. 1.87 km WSW of Cobb, California · 14269 days ago · 4 km deep · 0 km away
  5. 1.76 km W of Cobb, California · 14269 days ago · 3 km deep · 2 km away
  6. 1.76 km W of Cobb, California · 14270 days ago · 1 km deep · 3 km away
  7. 2.06 km NNE of Penngrove, California · 14270 days ago · 4 km deep · 52 km away
  8. 3.08 km W of Cobb, California · 14270 days ago · 1 km deep · 2 km away
  9. 2.05 km SSE of Kelseyville, California · 14270 days ago · 0 km deep · 15 km away
  10. 1.97 km W of Cobb, California · 14272 days ago · 3 km deep · 2 km away
  11. 2.14 km W of Cobb, California · 14272 days ago · 0 km deep · 3 km away
  12. 1.65 km SSW of Cobb, California · 14272 days ago · 0 km deep · 4 km away
  13. 2.05 km WNW of Cobb, California · 14272 days ago · 2 km deep · 4 km away
  14. 2.028 km NNE of Potter Valley, California · 14272 days ago · 13 km deep · 86 km away
  15. 2.37 km WSW of Cobb, California · 14273 days ago · 1 km deep · 1 km away
  16. 1.7Northern California · 14274 days ago · 0 km deep · 3 km away
  17. 2.26 km W of Cobb, California · 14274 days ago · 3 km deep · 2 km away
  18. 2.56 km W of Cobb, California · 14274 days ago · 1 km deep · 1 km away
  19. 2.38 km WSW of Cobb, California · 14275 days ago · 2 km deep · 1 km away
  20. 1.88 km W of Cobb, California · 14275 days ago · 0 km deep · 3 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1152425. Read Sun, Sep 27, 2026, 12:15 AM UTC.