California earthquakes

M2.9 earthquake 5 km WSW of Cobb, California

A magnitude 2.9 earthquake struck 5 km WSW of Cobb, California on Thu, May 28, 1987, 1:39 AM PDT (08:39 UTC), -1 km (0 mi) below the surface.

A larger quake followed: M3.3 4 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
2.9 (md), micro
Local time
UTC
1987-05-28 08:39:32 UTC
Depth
-0.7 km (-0.5 mi), shallow
Epicenter
38.798° N, 122.779° 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, 0.6 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
39°
Stations used
30

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 173 in the 60 days after this one and 110 in the 30 days before it.

After

  1. 1.65 km SW of Cobb, California · 14369 days ago · 0 km deep · 1 km away
  2. 1.66 km SW of Cobb, California · 14369 days ago · 1 km deep · 2 km away
  3. 1.716 km NNE of Upper Lake, California · 14369 days ago · 4 km deep · 55 km away
  4. 1.77 km WSW of Cobb, California · 14369 days ago · 4 km deep · 2 km away
  5. 2.44 km WNW of Cobb, California · 14369 days ago · 0 km deep · 4 km away
  6. 2.36 km WSW of Cobb, California · 14369 days ago · 4 km deep · 2 km away
  7. 1.94 km WNW of Cobb, California · 14369 days ago · 0 km deep · 4 km away
  8. 1.75 km SW of Cobb, California · 14369 days ago · 2 km deep · 2 km away
  9. 1.64 km SW of Cobb, California · 14368 days ago · -1 km deep · 1 km away
  10. 2.25 km W of Cobb, California · 14368 days ago · 1 km deep · 4 km away
  11. 3.34 km WNW of Cobb, California · 14368 days ago · 2 km deep · 5 km away
  12. 1.84 km SW of Hopland, California · 14367 days ago · 5 km deep · 37 km away
  13. 1.68 km W of Cobb, California · 14367 days ago · 1 km deep · 5 km away
  14. 1.614 km ENE of Angwin, California · 14367 days ago · -1 km deep · 47 km away
  15. 2.45 km W of Cobb, California · 14367 days ago · 1 km deep · 4 km away
  16. 2.55 km W of Cobb, California · 14367 days ago · 2 km deep · 3 km away
  17. 1.84 km W of Cobb, California · 14366 days ago · 0 km deep · 2 km away
  18. 2.46 km SW of Cobb, California · 14366 days ago · 1 km deep · 2 km away
  19. 2.36 km SW of Cobb, California · 14366 days ago · 2 km deep · 2 km away
  20. 1.86 km SSW of Sutter, California · 14366 days ago · 5 km deep · 94 km away
  21. 1.65 km SW of Cobb, California · 14366 days ago · 2 km deep · 1 km away
  22. 1.56 km SW of Cobb, California · 14366 days ago · 1 km deep · 2 km away
  23. 1.812 km ESE of Comptche, California · 14365 days ago · 6 km deep · 76 km away
  24. 1.66 km W of Cobb, California · 14365 days ago · 3 km deep · 3 km away
  25. 1.66 km WNW of Cobb, California · 14365 days ago · 1 km deep · 5 km away
  26. 1.68 km SE of Willits, California · 14365 days ago · 3 km deep · 76 km away
  27. 2.15 km SW of Cobb, California · 14363 days ago · 1 km deep · 2 km away
  28. 1.94 km W of Cobb, California · 14363 days ago · 0 km deep · 3 km away
  29. 2.08 km W of Cobb, California · 14362 days ago · 1 km deep · 5 km away
  30. 1.86 km W of Glen Ellen, California · 14362 days ago · 2 km deep · 51 km away
  31. 1.817 km ENE of Potter Valley, California · 14362 days ago · 7 km deep · 69 km away
  32. 2.54 km WSW of Cobb, California · 14361 days ago · 1 km deep · 1 km away
  33. 1.86 km W of Cobb, California · 14361 days ago · 1 km deep · 3 km away
  34. 2.27 km WSW of Cobb, California · 14361 days ago · 1 km deep · 2 km away
  35. 1.77 km WSW of Cobb, California · 14361 days ago · 1 km deep · 2 km away
  36. 2.13 km SSE of Calpella, California · 14360 days ago · 1 km deep · 57 km away
  37. 2.06 km WNW of Cobb, California · 14359 days ago · 1 km deep · 4 km away
  38. 2.8Northern California · 14359 days ago · 1 km deep · 4 km away
  39. 2.87 km W of Cobb, California · 14359 days ago · -1 km deep · 4 km away
  40. 1.84 km WSW of Cobb, California · 14359 days ago · 2 km deep · 1 km away
  41. 3.09 km W of Cobb, California · 14359 days ago · 1 km deep · 5 km away
  42. 1.59 km W of Cobb, California · 14359 days ago · 0 km deep · 6 km away
  43. 2.49 km W of Cobb, California · 14359 days ago · 0 km deep · 5 km away
  44. 1.89 km W of Cobb, California · 14359 days ago · 0 km deep · 5 km away
  45. 1.79 km SSE of Sea Ranch, California · 14358 days ago · 1 km deep · 57 km away
  46. 1.95 km WNW of Cobb, California · 14358 days ago · 2 km deep · 5 km away
  47. 1.68 km SSE of Sea Ranch, California · 14358 days ago · 5 km deep · 58 km away
  48. 1.68 km W of Cobb, California · 14358 days ago · 0 km deep · 5 km away
  49. 1.69 km W of Cobb, California · 14358 days ago · 0 km deep · 5 km away
  50. 1.64 km W of Cobb, California · 14357 days ago · 1 km deep · 3 km away
  51. 1.9Northern California · 14356 days ago · 3 km deep · 3 km away
  52. 1.69 km E of Hidden Valley Lake, California · 14356 days ago · 6 km deep · 29 km away
  53. 2.06 km W of Cobb, California · 14356 days ago · 3 km deep · 3 km away
  54. 1.74 km SSW of Cobb, California · 14356 days ago · 4 km deep · 3 km away
  55. 1.59 km W of Cobb, California · 14355 days ago · -1 km deep · 6 km away
  56. 1.77 km WSW of Cobb, California · 14355 days ago · 2 km deep · 2 km away
  57. 1.57 km S of Cobb, California · 14355 days ago · 0 km deep · 8 km away
  58. 3.15 km SW of Cobb, California · 14355 days ago · 1 km deep · 1 km away
  59. 1.95 km SW of Cobb, California · 14354 days ago · 1 km deep · 2 km away
  60. 1.65 km SW of Cobb, California · 14354 days ago · 0 km deep · 3 km away

The first 60 of 173.

Before

  1. 2.06 km SW of Cobb, California · 14369 days ago · -1 km deep · 1 km away
  2. 3.35 km WSW of Cobb, California · 14369 days ago · 1 km deep · 0 km away
  3. 1.65 km SW of Cobb, California · 14369 days ago · -1 km deep · 1 km away
  4. 1.75 km WSW of Cobb, California · 14369 days ago · 0 km deep · 0 km away
  5. 2.17 km WSW of Cobb, California · 14370 days ago · 1 km deep · 2 km away
  6. 1.75 km WNW of Cobb, California · 14370 days ago · 1 km deep · 4 km away
  7. 1.610 km SE of Sea Ranch, California · 14370 days ago · 4 km deep · 53 km away
  8. 2.67 km W of Cobb, California · 14370 days ago · 1 km deep · 3 km away
  9. 1.63 km W of Cobb, California · 14370 days ago · 0 km deep · 4 km away
  10. 1.65 km W of Cobb, California · 14370 days ago · 2 km deep · 3 km away
  11. 2.07 km W of Cobb, California · 14370 days ago · 1 km deep · 4 km away
  12. 1.511 km N of Brooktrails, California · 14370 days ago · 7 km deep · 99 km away
  13. 1.77 km WSW of Cobb, California · 14371 days ago · 3 km deep · 2 km away
  14. 2.28 km WSW of Cobb, California · 14371 days ago · 2 km deep · 4 km away
  15. 2.07 km W of Cobb, California · 14371 days ago · 1 km deep · 4 km away
  16. 1.56 km WSW of Cobb, California · 14371 days ago · 3 km deep · 2 km away
  17. 1.85 km SW of Cobb, California · 14372 days ago · 4 km deep · 3 km away
  18. 1.75 km SW of Cobb, California · 14372 days ago · 5 km deep · 2 km away
  19. 1.8Northern California · 14372 days ago · 9 km deep · 4 km away
  20. 2.19 km SE of Sea Ranch, California · 14372 days ago · -1 km deep · 55 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc101052. Read Tue, Sep 29, 2026, 2:49 PM UTC.