California earthquakes

M1.8 earthquake 6 km W of Cobb, California

A magnitude 1.8 earthquake struck 6 km W of Cobb, California on Tue, Feb 17, 1987, 10:21 AM PST (18:21 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M1.8 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
1.8 (md), micro
Local time
UTC
1987-02-17 18:21:39 UTC
Depth
3.2 km (2.0 mi), shallow
Epicenter
38.822° N, 122.794° 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, 0.5 km in depth
Magnitude uncertainty
±0.03
Depth from
From location
Station coverage gap
53°
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: 173 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.84 km WNW of Cobb, California · 14453 days ago · 2 km deep · 2 km away
  2. 1.520 km ENE of Potter Valley, California · 14453 days ago · 4 km deep · 63 km away
  3. 3.26 km W of Cobb, California · 14452 days ago · 3 km deep · 0 km away
  4. 2.55 km SW of Cobb, California · 14450 days ago · 1 km deep · 4 km away
  5. 2.05 km SW of Cobb, California · 14450 days ago · 1 km deep · 5 km away
  6. 2.34 km W of Cobb, California · 14450 days ago · 1 km deep · 2 km away
  7. 1.918 km ENE of Potter Valley, California · 14450 days ago · 7 km deep · 60 km away
  8. 1.95 km WSW of Cobb, California · 14450 days ago · 1 km deep · 3 km away
  9. 1.68 km WSW of Cobb, California · 14449 days ago · 0 km deep · 2 km away
  10. 1.66 km WSW of Cobb, California · 14449 days ago · 3 km deep · 2 km away
  11. 2.09 km W of Cobb, California · 14449 days ago · -1 km deep · 3 km away
  12. 2.518 km ENE of Potter Valley, California · 14448 days ago · 6 km deep · 62 km away
  13. 2.14 km SW of Cobb, California · 14448 days ago · 1 km deep · 5 km away
  14. 2.3Northern California · 14447 days ago · 1 km deep · 1 km away
  15. 1.77 km W of Cobb, California · 14446 days ago · 0 km deep · 2 km away
  16. 2.07 km WSW of Cobb, California · 14446 days ago · 1 km deep · 2 km away
  17. 1.72 km SSE of Clear Lake Riviera, CA · 14446 days ago · -1 km deep · 15 km away
  18. 2.64 km W of Cobb, California · 14446 days ago · 1 km deep · 1 km away
  19. 1.75 km W of Cobb, California · 14446 days ago · 1 km deep · 1 km away
  20. 1.76 km W of Cobb, California · 14445 days ago · 3 km deep · 1 km away
  21. 1.78 km WSW of Cobb, California · 14445 days ago · 3 km deep · 3 km away
  22. 2.611 km SE of Hopland, California · 14444 days ago · 4 km deep · 22 km away
  23. 2.88 km W of Cobb, California · 14444 days ago · -1 km deep · 3 km away
  24. 1.610 km ENE of Hidden Valley Lake, California · 14444 days ago · 2 km deep · 29 km away
  25. 1.96 km W of Cobb, California · 14444 days ago · 1 km deep · 1 km away
  26. 1.65 km WSW of Cobb, California · 14444 days ago · 1 km deep · 2 km away
  27. 2.27 km W of Cobb, California · 14444 days ago · 1 km deep · 2 km away
  28. 1.76 km W of Cobb, California · 14444 days ago · 3 km deep · 1 km away
  29. 2.48 km W of Cobb, California · 14443 days ago · 1 km deep · 3 km away
  30. 1.93 km WSW of Anchor Bay, California · 14443 days ago · 8 km deep · 72 km away
  31. 1.95 km SW of Cobb, California · 14442 days ago · 0 km deep · 4 km away
  32. 1.64 km WSW of Cobb, California · 14442 days ago · 1 km deep · 2 km away
  33. 1.98 km WSW of Cobb, California · 14442 days ago · 3 km deep · 3 km away
  34. 1.56 km SW of Cobb, California · 14442 days ago · 3 km deep · 4 km away
  35. 1.6Northern California · 14441 days ago · 1 km deep · 3 km away
  36. 1.7Northern California · 14441 days ago · 2 km deep · 2 km away
  37. 2.37 km WSW of Cobb, California · 14441 days ago · 1 km deep · 2 km away
  38. 2.816 km NE of Upper Lake, California · 14441 days ago · 3 km deep · 51 km away
  39. 2.117 km NE of Upper Lake, California · 14441 days ago · 6 km deep · 51 km away
  40. 2.06 km SW of Cobb, California · 14441 days ago · 1 km deep · 4 km away
  41. 1.67 km WSW of Cobb, California · 14440 days ago · 1 km deep · 2 km away
  42. 2.416 km NE of Upper Lake, California · 14440 days ago · 6 km deep · 51 km away
  43. 1.67 km WNW of Geyserville, California · 14440 days ago · 2 km deep · 18 km away
  44. 2.37 km W of Cobb, California · 14440 days ago · 3 km deep · 2 km away
  45. 2.26 km WSW of Cobb, California · 14439 days ago · 3 km deep · 2 km away
  46. 2.912 km ESE of Hidden Valley Lake, California · 14439 days ago · 9 km deep · 33 km away
  47. 1.512 km ESE of Hidden Valley Lake, California · 14439 days ago · 5 km deep · 32 km away
  48. 1.68 km WSW of Cobb, California · 14439 days ago · 2 km deep · 3 km away
  49. 1.86 km WSW of Cobb, California · 14438 days ago · 1 km deep · 1 km away
  50. 1.56 km W of Cobb, California · 14438 days ago · 3 km deep · 1 km away
  51. 3.09 km WSW of Cobb, California · 14438 days ago · 3 km deep · 4 km away
  52. 2.89 km WSW of Cobb, California · 14438 days ago · 2 km deep · 4 km away
  53. 1.65 km N of Novato, California · 14438 days ago · 2 km deep · 76 km away
  54. 2.17 km WSW of Cobb, California · 14437 days ago · 2 km deep · 2 km away
  55. 1.55 km SW of Cobb, California · 14437 days ago · 2 km deep · 4 km away
  56. 2.07 km E of Clearlake Oaks, California · 14437 days ago · 1 km deep · 29 km away
  57. 1.76 km WSW of Cobb, California · 14437 days ago · 1 km deep · 2 km away
  58. 2.4Northern California · 14436 days ago · 3 km deep · 2 km away
  59. 2.47 km WSW of Cobb, California · 14436 days ago · 1 km deep · 2 km away
  60. 2.26 km W of Cobb, California · 14436 days ago · 2 km deep · 0 km away

The first 60 of 173.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc94949. Read Tue, Sep 22, 2026, 5:24 PM UTC.