California earthquakes

M1.6 earthquake 5 km SW of Cobb, California

A magnitude 1.6 earthquake struck 5 km SW of Cobb, California on Sun, May 31, 1987, 3:42 PM PDT (22:42 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
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1987-05-31 22:42:49 UTC
Depth
1.6 km (1.0 mi), shallow
Epicenter
38.787° N, 122.773° 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, 0.7 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
85°
Stations used
9

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 125 in the 30 days before it.

After

  1. 1.56 km SW of Cobb, California · 14369 days ago · 1 km deep · 1 km away
  2. 1.812 km ESE of Comptche, California · 14368 days ago · 6 km deep · 77 km away
  3. 1.66 km W of Cobb, California · 14368 days ago · 3 km deep · 4 km away
  4. 1.66 km WNW of Cobb, California · 14368 days ago · 1 km deep · 6 km away
  5. 1.68 km SE of Willits, California · 14368 days ago · 3 km deep · 77 km away
  6. 2.15 km SW of Cobb, California · 14366 days ago · 1 km deep · 1 km away
  7. 1.94 km W of Cobb, California · 14366 days ago · 0 km deep · 4 km away
  8. 2.08 km W of Cobb, California · 14365 days ago · 1 km deep · 6 km away
  9. 1.86 km W of Glen Ellen, California · 14365 days ago · 2 km deep · 50 km away
  10. 1.817 km ENE of Potter Valley, California · 14365 days ago · 7 km deep · 71 km away
  11. 2.54 km WSW of Cobb, California · 14365 days ago · 1 km deep · 2 km away
  12. 1.86 km W of Cobb, California · 14364 days ago · 1 km deep · 4 km away
  13. 2.27 km WSW of Cobb, California · 14364 days ago · 1 km deep · 3 km away
  14. 1.77 km WSW of Cobb, California · 14364 days ago · 1 km deep · 3 km away
  15. 2.13 km SSE of Calpella, California · 14363 days ago · 1 km deep · 58 km away
  16. 2.06 km WNW of Cobb, California · 14362 days ago · 1 km deep · 6 km away
  17. 2.8Northern California · 14362 days ago · 1 km deep · 5 km away
  18. 2.87 km W of Cobb, California · 14362 days ago · -1 km deep · 5 km away
  19. 1.84 km WSW of Cobb, California · 14362 days ago · 2 km deep · 1 km away
  20. 3.09 km W of Cobb, California · 14362 days ago · 1 km deep · 6 km away
  21. 1.59 km W of Cobb, California · 14362 days ago · 0 km deep · 7 km away
  22. 2.49 km W of Cobb, California · 14362 days ago · 0 km deep · 7 km away
  23. 1.89 km W of Cobb, California · 14362 days ago · 0 km deep · 7 km away
  24. 1.79 km SSE of Sea Ranch, California · 14361 days ago · 1 km deep · 57 km away
  25. 1.95 km WNW of Cobb, California · 14361 days ago · 2 km deep · 6 km away
  26. 1.68 km SSE of Sea Ranch, California · 14361 days ago · 5 km deep · 58 km away
  27. 1.68 km W of Cobb, California · 14361 days ago · 0 km deep · 6 km away
  28. 1.69 km W of Cobb, California · 14361 days ago · 0 km deep · 6 km away
  29. 1.64 km W of Cobb, California · 14360 days ago · 1 km deep · 4 km away
  30. 1.9Northern California · 14359 days ago · 3 km deep · 4 km away
  31. 1.69 km E of Hidden Valley Lake, California · 14359 days ago · 6 km deep · 29 km away
  32. 2.06 km W of Cobb, California · 14359 days ago · 3 km deep · 4 km away
  33. 1.74 km SSW of Cobb, California · 14359 days ago · 4 km deep · 2 km away
  34. 1.59 km W of Cobb, California · 14359 days ago · -1 km deep · 7 km away
  35. 1.77 km WSW of Cobb, California · 14358 days ago · 2 km deep · 3 km away
  36. 1.57 km S of Cobb, California · 14358 days ago · 0 km deep · 6 km away
  37. 3.15 km SW of Cobb, California · 14358 days ago · 1 km deep · 0 km away
  38. 1.95 km SW of Cobb, California · 14358 days ago · 1 km deep · 0 km away
  39. 1.65 km SW of Cobb, California · 14358 days ago · 0 km deep · 1 km away
  40. 2.38 km W of Cobb, California · 14357 days ago · 1 km deep · 6 km away
  41. 2.38 km W of Cobb, California · 14357 days ago · 2 km deep · 6 km away
  42. 1.98 km W of Cobb, California · 14357 days ago · 1 km deep · 7 km away
  43. 2.0Northern California · 14357 days ago · 1 km deep · 5 km away
  44. 1.73 km NNW of Cobb, California · 14357 days ago · 2 km deep · 8 km away
  45. 2.35 km SW of Cobb, California · 14356 days ago · -1 km deep · 0 km away
  46. 1.64 km W of Cobb, California · 14356 days ago · 1 km deep · 4 km away
  47. 1.93 km NNE of Windsor, California · 14356 days ago · 2 km deep · 23 km away
  48. 2.57 km WSW of Cobb, California · 14356 days ago · 2 km deep · 4 km away
  49. 1.75 km SSW of Cobb, California · 14355 days ago · -1 km deep · 3 km away
  50. 3.26 km W of Cobb, California · 14355 days ago · 3 km deep · 5 km away
  51. 1.87 km W of Cobb, California · 14355 days ago · 1 km deep · 5 km away
  52. 2.07 km WSW of Cobb, California · 14354 days ago · 1 km deep · 4 km away
  53. 1.714 km SE of Hidden Valley Lake, California · 14354 days ago · -1 km deep · 31 km away
  54. 1.95 km W of Cobb, California · 14354 days ago · 0 km deep · 5 km away
  55. 2.26 km W of Cobb, California · 14354 days ago · 0 km deep · 5 km away
  56. 1.64 km SW of Cobb, California · 14354 days ago · 4 km deep · 2 km away
  57. 2.45 km N of Port Costa, California · 14353 days ago · 10 km deep · 93 km away
  58. 2.06 km W of Cobb, California · 14353 days ago · 2 km deep · 4 km away
  59. 1.94 km NW of Potter Valley, California · 14351 days ago · 4 km deep · 70 km away
  60. 2.38 km W of Cobb, California · 14351 days ago · -1 km deep · 6 km away

The first 60 of 174.

Before

  1. 1.86 km SSW of Sutter, California · 14369 days ago · 5 km deep · 94 km away
  2. 2.36 km SW of Cobb, California · 14369 days ago · 2 km deep · 0 km away
  3. 2.46 km SW of Cobb, California · 14369 days ago · 1 km deep · 0 km away
  4. 1.84 km W of Cobb, California · 14369 days ago · 0 km deep · 3 km away
  5. 2.55 km W of Cobb, California · 14370 days ago · 2 km deep · 4 km away
  6. 2.45 km W of Cobb, California · 14370 days ago · 1 km deep · 5 km away
  7. 1.614 km ENE of Angwin, California · 14370 days ago · -1 km deep · 46 km away
  8. 1.68 km W of Cobb, California · 14370 days ago · 1 km deep · 6 km away
  9. 1.84 km SW of Hopland, California · 14370 days ago · 5 km deep · 38 km away
  10. 3.34 km WNW of Cobb, California · 14371 days ago · 2 km deep · 6 km away
  11. 2.25 km W of Cobb, California · 14371 days ago · 1 km deep · 5 km away
  12. 1.64 km SW of Cobb, California · 14371 days ago · -1 km deep · 1 km away
  13. 1.75 km SW of Cobb, California · 14372 days ago · 2 km deep · 0 km away
  14. 1.94 km WNW of Cobb, California · 14372 days ago · 0 km deep · 5 km away
  15. 2.36 km WSW of Cobb, California · 14372 days ago · 4 km deep · 3 km away
  16. 2.44 km WNW of Cobb, California · 14372 days ago · 0 km deep · 5 km away
  17. 1.77 km WSW of Cobb, California · 14372 days ago · 4 km deep · 3 km away
  18. 1.716 km NNE of Upper Lake, California · 14372 days ago · 4 km deep · 56 km away
  19. 1.66 km SW of Cobb, California · 14372 days ago · 1 km deep · 1 km away
  20. 1.65 km SW of Cobb, California · 14372 days ago · 0 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1150174. Read Fri, Oct 2, 2026, 4:02 PM UTC.