California earthquakes

M1.8 earthquake 4 km WSW of Cobb, California

A magnitude 1.8 earthquake struck 4 km WSW of Cobb, California on Sun, Jun 7, 1987, 12:56 PM PDT (19:56 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M3.2 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
1987-06-07 19:56:16 UTC
Depth
2.0 km (1.2 mi), shallow
Epicenter
38.800° N, 122.769° 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, 0.4 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
44°
Stations used
19

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 176 in the 60 days after this one and 122 in the 30 days before it.

After

  1. 3.09 km W of Cobb, California · 14360 days ago · 1 km deep · 6 km away
  2. 1.59 km W of Cobb, California · 14360 days ago · 0 km deep · 6 km away
  3. 2.49 km W of Cobb, California · 14360 days ago · 0 km deep · 6 km away
  4. 1.89 km W of Cobb, California · 14360 days ago · 0 km deep · 6 km away
  5. 1.79 km SSE of Sea Ranch, California · 14359 days ago · 1 km deep · 58 km away
  6. 1.95 km WNW of Cobb, California · 14359 days ago · 2 km deep · 5 km away
  7. 1.68 km SSE of Sea Ranch, California · 14359 days ago · 5 km deep · 59 km away
  8. 1.68 km W of Cobb, California · 14359 days ago · 0 km deep · 5 km away
  9. 1.69 km W of Cobb, California · 14359 days ago · 0 km deep · 6 km away
  10. 1.64 km W of Cobb, California · 14359 days ago · 1 km deep · 3 km away
  11. 1.9Northern California · 14358 days ago · 3 km deep · 4 km away
  12. 1.69 km E of Hidden Valley Lake, California · 14357 days ago · 6 km deep · 28 km away
  13. 2.06 km W of Cobb, California · 14357 days ago · 3 km deep · 4 km away
  14. 1.74 km SSW of Cobb, California · 14357 days ago · 4 km deep · 2 km away
  15. 1.59 km W of Cobb, California · 14357 days ago · -1 km deep · 7 km away
  16. 1.77 km WSW of Cobb, California · 14356 days ago · 2 km deep · 3 km away
  17. 1.57 km S of Cobb, California · 14356 days ago · 0 km deep · 7 km away
  18. 3.15 km SW of Cobb, California · 14356 days ago · 1 km deep · 2 km away
  19. 1.95 km SW of Cobb, California · 14356 days ago · 1 km deep · 2 km away
  20. 1.65 km SW of Cobb, California · 14356 days ago · 0 km deep · 3 km away
  21. 2.38 km W of Cobb, California · 14355 days ago · 1 km deep · 6 km away
  22. 2.38 km W of Cobb, California · 14355 days ago · 2 km deep · 6 km away
  23. 1.98 km W of Cobb, California · 14355 days ago · 1 km deep · 6 km away
  24. 2.0Northern California · 14355 days ago · 1 km deep · 5 km away
  25. 1.73 km NNW of Cobb, California · 14355 days ago · 2 km deep · 6 km away
  26. 2.35 km SW of Cobb, California · 14354 days ago · -1 km deep · 1 km away
  27. 1.64 km W of Cobb, California · 14354 days ago · 1 km deep · 3 km away
  28. 1.93 km NNE of Windsor, California · 14354 days ago · 2 km deep · 25 km away
  29. 2.57 km WSW of Cobb, California · 14354 days ago · 2 km deep · 3 km away
  30. 1.75 km SSW of Cobb, California · 14353 days ago · -1 km deep · 3 km away
  31. 3.26 km W of Cobb, California · 14353 days ago · 3 km deep · 4 km away
  32. 1.87 km W of Cobb, California · 14353 days ago · 1 km deep · 4 km away
  33. 2.07 km WSW of Cobb, California · 14352 days ago · 1 km deep · 4 km away
  34. 1.714 km SE of Hidden Valley Lake, California · 14352 days ago · -1 km deep · 31 km away
  35. 1.95 km W of Cobb, California · 14352 days ago · 0 km deep · 4 km away
  36. 2.26 km W of Cobb, California · 14352 days ago · 0 km deep · 4 km away
  37. 1.64 km SW of Cobb, California · 14352 days ago · 4 km deep · 2 km away
  38. 2.45 km N of Port Costa, California · 14352 days ago · 10 km deep · 94 km away
  39. 2.06 km W of Cobb, California · 14351 days ago · 2 km deep · 3 km away
  40. 1.94 km NW of Potter Valley, California · 14349 days ago · 4 km deep · 69 km away
  41. 2.38 km W of Cobb, California · 14349 days ago · -1 km deep · 5 km away
  42. 1.84 km WSW of Cobb, California · 14349 days ago · 1 km deep · 1 km away
  43. 2.57 km W of Cobb, California · 14348 days ago · 4 km deep · 4 km away
  44. 2.27 km WSW of Cobb, California · 14348 days ago · 3 km deep · 3 km away
  45. 2.04 km W of Cobb, California · 14348 days ago · -1 km deep · 3 km away
  46. 1.6Northern California · 14348 days ago · 1 km deep · 3 km away
  47. 2.017 km NNE of Angwin, California · 14348 days ago · 9 km deep · 35 km away
  48. 1.77 km W of Cobb, California · 14348 days ago · 3 km deep · 4 km away
  49. 1.87 km W of Cobb, California · 14348 days ago · 2 km deep · 4 km away
  50. 1.65 km WNW of Cobb, California · 14347 days ago · 1 km deep · 4 km away
  51. 1.95 km W of Cobb, California · 14347 days ago · 0 km deep · 3 km away
  52. 1.65 km WNW of Cobb, California · 14347 days ago · 1 km deep · 4 km away
  53. 2.15 km SSW of Cobb, California · 14347 days ago · 0 km deep · 2 km away
  54. 1.66 km W of Cobb, California · 14347 days ago · 3 km deep · 4 km away
  55. 1.66 km W of Cobb, California · 14347 days ago · 2 km deep · 4 km away
  56. 1.64 km W of Cobb, California · 14347 days ago · 1 km deep · 3 km away
  57. 2.03 km SW of Moskowite Corner, California · 14347 days ago · 8 km deep · 63 km away
  58. 1.521 km ENE of Potter Valley, California · 14346 days ago · 9 km deep · 63 km away
  59. 2.19 km WSW of Cobb, California · 14346 days ago · 1 km deep · 5 km away
  60. 1.85 km WSW of Cobb, California · 14345 days ago · 0 km deep · 1 km away

The first 60 of 176.

Before

  1. 2.87 km W of Cobb, California · 14360 days ago · -1 km deep · 4 km away
  2. 2.8Northern California · 14360 days ago · 1 km deep · 4 km away
  3. 2.06 km WNW of Cobb, California · 14360 days ago · 1 km deep · 4 km away
  4. 2.13 km SSE of Calpella, California · 14361 days ago · 1 km deep · 57 km away
  5. 1.77 km WSW of Cobb, California · 14362 days ago · 1 km deep · 3 km away
  6. 2.27 km WSW of Cobb, California · 14362 days ago · 1 km deep · 3 km away
  7. 1.86 km W of Cobb, California · 14363 days ago · 1 km deep · 3 km away
  8. 2.54 km WSW of Cobb, California · 14363 days ago · 1 km deep · 0 km away
  9. 1.817 km ENE of Potter Valley, California · 14363 days ago · 7 km deep · 69 km away
  10. 1.86 km W of Glen Ellen, California · 14363 days ago · 2 km deep · 51 km away
  11. 2.08 km W of Cobb, California · 14363 days ago · 1 km deep · 5 km away
  12. 1.94 km W of Cobb, California · 14364 days ago · 0 km deep · 2 km away
  13. 2.15 km SW of Cobb, California · 14364 days ago · 1 km deep · 2 km away
  14. 1.68 km SE of Willits, California · 14366 days ago · 3 km deep · 76 km away
  15. 1.66 km WNW of Cobb, California · 14366 days ago · 1 km deep · 5 km away
  16. 1.66 km W of Cobb, California · 14366 days ago · 3 km deep · 4 km away
  17. 1.812 km ESE of Comptche, California · 14366 days ago · 6 km deep · 76 km away
  18. 1.56 km SW of Cobb, California · 14367 days ago · 1 km deep · 2 km away
  19. 1.65 km SW of Cobb, California · 14367 days ago · 2 km deep · 1 km away
  20. 1.86 km SSW of Sutter, California · 14367 days ago · 5 km deep · 93 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc101570. Read Wed, Sep 30, 2026, 9:09 PM UTC.