California earthquakes

M2.1 earthquake 5 km SSW of Cobb, California

A magnitude 2.1 earthquake struck 5 km SSW of Cobb, California on Sat, Jun 20, 1987, 8:03 AM PDT (15:03 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M3.0 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
2.1 (md), micro
Local time
UTC
1987-06-20 15:03:35 UTC
Depth
-0.3 km (-0.2 mi), shallow
Epicenter
38.779° N, 122.758° 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, 0.9 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
72°
Stations used
15

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 168 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.55 km W of Cobb, California · 14325 days ago · 0 km deep · 5 km away
  2. 1.59 km W of Cobb, California · 14325 days ago · 1 km deep · 7 km away
  3. 1.79 km ESE of Willits, California · 14325 days ago · 3 km deep · 78 km away
  4. 1.92 km N of Larkfield-Wikiup, California · 14325 days ago · 5 km deep · 27 km away
  5. 1.84 km W of Cobb, California · 14324 days ago · 2 km deep · 5 km away
  6. 3.05 km SW of Cobb, California · 14324 days ago · 0 km deep · 2 km away
  7. 2.15 km SW of Cobb, California · 14324 days ago · 0 km deep · 2 km away
  8. 2.54 km W of Cobb, California · 14324 days ago · 0 km deep · 5 km away
  9. 1.6Northern California · 14324 days ago · -1 km deep · 0 km away
  10. 1.65 km W of Cobb, California · 14323 days ago · 0 km deep · 5 km away
  11. 2.05 km NE of Penngrove, California · 14322 days ago · 4 km deep · 51 km away
  12. 1.711 km E of Calpella, California · 14322 days ago · 1 km deep · 56 km away
  13. 2.48 km WSW of Cobb, California · 14322 days ago · 2 km deep · 5 km away
  14. 1.68 km W of Cobb, California · 14321 days ago · 1 km deep · 7 km away
  15. 2.03 km SW of Cobb, California · 14321 days ago · 2 km deep · 2 km away
  16. 1.94 km W of Cobb, California · 14321 days ago · 0 km deep · 6 km away
  17. 1.69 km WSW of Cobb, California · 14321 days ago · 1 km deep · 7 km away
  18. 1.85 km SW of Cobb, California · 14321 days ago · 0 km deep · 2 km away
  19. 1.94 km WSW of Cobb, California · 14320 days ago · 1 km deep · 3 km away
  20. 1.74 km SSW of Cobb, California · 14320 days ago · 1 km deep · 1 km away
  21. 2.06 km W of Cobb, California · 14320 days ago · 4 km deep · 6 km away
  22. 1.96 km WSW of Cobb, California · 14319 days ago · 4 km deep · 4 km away
  23. 1.912 km WSW of Hopland, California · 14319 days ago · 1 km deep · 45 km away
  24. 2.17 km WSW of Cobb, California · 14318 days ago · 0 km deep · 5 km away
  25. 2.19 km WSW of Cobb, California · 14318 days ago · 1 km deep · 7 km away
  26. 2.08 km W of Cobb, California · 14318 days ago · 0 km deep · 7 km away
  27. 2.19 km WSW of Cobb, California · 14318 days ago · 2 km deep · 6 km away
  28. 1.99 km NNE of Brooktrails, California · 14317 days ago · 9 km deep · 96 km away
  29. 1.54 km SW of Cobb, California · 14317 days ago · 0 km deep · 1 km away
  30. 2.16 km WSW of Cobb, California · 14316 days ago · 3 km deep · 5 km away
  31. 1.93 km NNW of Cloverdale, California · 14316 days ago · -1 km deep · 24 km away
  32. 1.86 km W of Cobb, California · 14316 days ago · -1 km deep · 5 km away
  33. 1.73 km W of Cobb, California · 14315 days ago · -1 km deep · 4 km away
  34. 2.06 km W of Cobb, California · 14315 days ago · 3 km deep · 6 km away
  35. 1.84 km W of Cobb, California · 14315 days ago · 0 km deep · 5 km away
  36. 2.58 km W of Cobb, California · 14315 days ago · 0 km deep · 8 km away
  37. 1.88 km W of Cobb, California · 14315 days ago · -1 km deep · 8 km away
  38. 1.68 km W of Cobb, California · 14315 days ago · 1 km deep · 6 km away
  39. 2.27 km WSW of Cobb, California · 14315 days ago · 0 km deep · 5 km away
  40. 1.84 km WNW of Cobb, California · 14314 days ago · 2 km deep · 6 km away
  41. 1.74 km WNW of Cobb, California · 14314 days ago · 2 km deep · 6 km away
  42. 1.65 km SSW of Cobb, California · 14314 days ago · 3 km deep · 0 km away
  43. 2.16 km WSW of Cobb, California · 14314 days ago · 1 km deep · 4 km away
  44. 1.78 km W of Cobb, California · 14313 days ago · 2 km deep · 7 km away
  45. 1.77 km W of Cobb, California · 14313 days ago · 3 km deep · 6 km away
  46. 1.85 km SW of Cobb, California · 14312 days ago · -1 km deep · 0 km away
  47. 2.45 km SW of Cobb, California · 14312 days ago · 2 km deep · 1 km away
  48. 1.64 km N of Cloverdale, California · 14312 days ago · 4 km deep · 24 km away
  49. 2.09 km W of Cobb, California · 14312 days ago · -1 km deep · 7 km away
  50. 1.79 km W of Cobb, California · 14312 days ago · -1 km deep · 7 km away
  51. 2.15 km W of Cobb, California · 14312 days ago · 0 km deep · 5 km away
  52. 1.76 km WSW of Cobb, California · 14312 days ago · 0 km deep · 4 km away
  53. 1.65 km SSW of Cobb, California · 14312 days ago · 4 km deep · 2 km away
  54. 1.76 km WSW of Cobb, California · 14312 days ago · 1 km deep · 4 km away
  55. 1.68 km WSW of Cobb, California · 14310 days ago · 3 km deep · 6 km away
  56. 1.817 km NNE of Angwin, California · 14310 days ago · 6 km deep · 33 km away
  57. 1.66 km W of Cobb, California · 14309 days ago · 2 km deep · 5 km away
  58. 1.95 km W of Cobb, California · 14309 days ago · -1 km deep · 5 km away
  59. 1.66 km W of Cobb, California · 14309 days ago · 1 km deep · 6 km away
  60. 2.55 km WSW of Cobb, California · 14309 days ago · 0 km deep · 3 km away

The first 60 of 168.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1150554. Read Tue, Sep 22, 2026, 9:31 PM UTC.