California earthquakes

M1.8 earthquake 6 km W of Cobb, California

A magnitude 1.8 earthquake struck 6 km W of Cobb, California on Sat, May 23, 1987, 4:36 PM PDT (23:36 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M1.9 Northern 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
1987-05-23 23:36:56 UTC
Depth
2.8 km (1.7 mi), shallow
Epicenter
38.820° N, 122.800° 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
±0.15
Depth from
From location
Station coverage gap
69°
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 174 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.64 km W of Cobb, California · 14351 days ago · 1 km deep · 2 km away
  2. 1.9Northern California · 14350 days ago · 3 km deep · 3 km away
  3. 1.69 km E of Hidden Valley Lake, California · 14349 days ago · 6 km deep · 31 km away
  4. 2.06 km W of Cobb, California · 14349 days ago · 3 km deep · 0 km away
  5. 1.74 km SSW of Cobb, California · 14349 days ago · 4 km deep · 6 km away
  6. 1.59 km W of Cobb, California · 14349 days ago · -1 km deep · 3 km away
  7. 1.77 km WSW of Cobb, California · 14348 days ago · 2 km deep · 2 km away
  8. 1.57 km S of Cobb, California · 14348 days ago · 0 km deep · 11 km away
  9. 3.15 km SW of Cobb, California · 14348 days ago · 1 km deep · 4 km away
  10. 1.95 km SW of Cobb, California · 14348 days ago · 1 km deep · 5 km away
  11. 1.65 km SW of Cobb, California · 14348 days ago · 0 km deep · 6 km away
  12. 2.38 km W of Cobb, California · 14347 days ago · 1 km deep · 2 km away
  13. 2.38 km W of Cobb, California · 14347 days ago · 2 km deep · 2 km away
  14. 1.98 km W of Cobb, California · 14347 days ago · 1 km deep · 2 km away
  15. 2.0Northern California · 14347 days ago · 1 km deep · 1 km away
  16. 1.73 km NNW of Cobb, California · 14347 days ago · 2 km deep · 7 km away
  17. 2.35 km SW of Cobb, California · 14346 days ago · -1 km deep · 4 km away
  18. 1.64 km W of Cobb, California · 14346 days ago · 1 km deep · 3 km away
  19. 1.93 km NNE of Windsor, California · 14346 days ago · 2 km deep · 27 km away
  20. 2.57 km WSW of Cobb, California · 14346 days ago · 2 km deep · 2 km away
  21. 1.75 km SSW of Cobb, California · 14345 days ago · -1 km deep · 7 km away
  22. 3.26 km W of Cobb, California · 14345 days ago · 3 km deep · 0 km away
  23. 1.87 km W of Cobb, California · 14345 days ago · 1 km deep · 1 km away
  24. 2.07 km WSW of Cobb, California · 14344 days ago · 1 km deep · 2 km away
  25. 1.714 km SE of Hidden Valley Lake, California · 14344 days ago · -1 km deep · 35 km away
  26. 1.95 km W of Cobb, California · 14344 days ago · 0 km deep · 1 km away
  27. 2.26 km W of Cobb, California · 14344 days ago · 0 km deep · 1 km away
  28. 1.64 km SW of Cobb, California · 14344 days ago · 4 km deep · 5 km away
  29. 2.45 km N of Port Costa, California · 14344 days ago · 10 km deep · 97 km away
  30. 2.06 km W of Cobb, California · 14343 days ago · 2 km deep · 0 km away
  31. 1.94 km NW of Potter Valley, California · 14341 days ago · 4 km deep · 66 km away
  32. 2.38 km W of Cobb, California · 14341 days ago · -1 km deep · 2 km away
  33. 1.84 km WSW of Cobb, California · 14341 days ago · 1 km deep · 3 km away
  34. 2.57 km W of Cobb, California · 14340 days ago · 4 km deep · 1 km away
  35. 2.27 km WSW of Cobb, California · 14340 days ago · 3 km deep · 2 km away
  36. 2.04 km W of Cobb, California · 14340 days ago · -1 km deep · 2 km away
  37. 1.6Northern California · 14340 days ago · 1 km deep · 2 km away
  38. 2.017 km NNE of Angwin, California · 14340 days ago · 9 km deep · 38 km away
  39. 1.77 km W of Cobb, California · 14340 days ago · 3 km deep · 1 km away
  40. 1.87 km W of Cobb, California · 14340 days ago · 2 km deep · 1 km away
  41. 1.65 km WNW of Cobb, California · 14339 days ago · 1 km deep · 2 km away
  42. 1.95 km W of Cobb, California · 14339 days ago · 0 km deep · 1 km away
  43. 1.65 km WNW of Cobb, California · 14339 days ago · 1 km deep · 2 km away
  44. 2.15 km SSW of Cobb, California · 14339 days ago · 0 km deep · 6 km away
  45. 1.66 km W of Cobb, California · 14339 days ago · 3 km deep · 0 km away
  46. 1.66 km W of Cobb, California · 14339 days ago · 2 km deep · 1 km away
  47. 1.64 km W of Cobb, California · 14339 days ago · 1 km deep · 2 km away
  48. 2.03 km SW of Moskowite Corner, California · 14339 days ago · 8 km deep · 66 km away
  49. 1.521 km ENE of Potter Valley, California · 14338 days ago · 9 km deep · 61 km away
  50. 2.19 km WSW of Cobb, California · 14338 days ago · 1 km deep · 3 km away
  51. 1.85 km WSW of Cobb, California · 14337 days ago · 0 km deep · 3 km away
  52. 1.82 km N of Cloverdale, California · 14337 days ago · 0 km deep · 19 km away
  53. 1.94 km WSW of Cobb, California · 14337 days ago · 5 km deep · 3 km away
  54. 1.88 km WSW of Cobb, California · 14336 days ago · -1 km deep · 2 km away
  55. 1.85 km SSW of Cobb, California · 14336 days ago · 1 km deep · 6 km away
  56. 1.86 km SW of Cobb, California · 14336 days ago · 1 km deep · 4 km away
  57. 1.610 km SE of Boonville, California · 14336 days ago · 2 km deep · 44 km away
  58. 1.810 km SE of Boonville, California · 14336 days ago · 1 km deep · 44 km away
  59. 2.15 km W of Cobb, California · 14335 days ago · 1 km deep · 2 km away
  60. 1.73 km ENE of Calpella, California · 14335 days ago · 2 km deep · 57 km away

The first 60 of 174.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc100885. Read Tue, Sep 22, 2026, 8:45 PM UTC.