California earthquakes

M1.8 earthquake 4 km W of Cobb, California

A magnitude 1.8 earthquake struck 4 km W of Cobb, California on Tue, Mar 17, 1987, 6:49 PM PST (02:49 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M2.0 6 km WSW 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
1987-03-18 02:49:00 UTC
Depth
1.3 km (0.8 mi), shallow
Epicenter
38.829° N, 122.778° 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
±0.14
Depth from
From location
Station coverage gap
41°
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: 171 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 2.06 km WSW of Cobb, California · 14422 days ago · 0 km deep · 4 km away
  2. 1.55 km SW of Cobb, California · 14422 days ago · 2 km deep · 5 km away
  3. 2.95 km SW of Cobb, California · 14422 days ago · 3 km deep · 4 km away
  4. 1.95 km SW of Cobb, California · 14420 days ago · 1 km deep · 5 km away
  5. 1.76 km W of Cobb, California · 14420 days ago · 3 km deep · 2 km away
  6. 2.615 km W of Guinda, California · 14420 days ago · -1 km deep · 35 km away
  7. 1.64 km ESE of Boonville, CA · 14420 days ago · 4 km deep · 51 km away
  8. 1.84 km ESE of Boonville, California · 14420 days ago · 5 km deep · 51 km away
  9. 1.63 km ESE of Boonville, California · 14419 days ago · 5 km deep · 51 km away
  10. 2.96 km WSW of Cobb, California · 14419 days ago · 4 km deep · 3 km away
  11. 2.06 km SW of Cobb, California · 14419 days ago · -1 km deep · 5 km away
  12. 1.77 km W of Cobb, California · 14418 days ago · 0 km deep · 3 km away
  13. 1.67 km W of Cobb, California · 14418 days ago · 2 km deep · 3 km away
  14. 1.613 km ESE of Hidden Valley Lake, California · 14418 days ago · 3 km deep · 32 km away
  15. 2.16 km W of Cobb, California · 14417 days ago · 4 km deep · 2 km away
  16. 1.93 km ESE of Kenwood, California · 14417 days ago · 0 km deep · 54 km away
  17. 1.79 km W of Cobb, California · 14417 days ago · 0 km deep · 5 km away
  18. 1.84 km WSW of Cobb, California · 14416 days ago · 1 km deep · 3 km away
  19. 1.68 km W of Cobb, California · 14416 days ago · 1 km deep · 4 km away
  20. 1.64 km WSW of Cobb, California · 14416 days ago · 0 km deep · 3 km away
  21. 1.66 km SW of Cobb, California · 14415 days ago · 1 km deep · 5 km away
  22. 1.94 km WSW of Cobb, California · 14414 days ago · 2 km deep · 3 km away
  23. 1.76 km W of Cobb, California · 14413 days ago · 3 km deep · 2 km away
  24. 1.57 km WSW of Cobb, California · 14413 days ago · 3 km deep · 5 km away
  25. 1.66 km W of Cobb, California · 14413 days ago · 3 km deep · 2 km away
  26. 1.68 km WSW of Cobb, California · 14413 days ago · 3 km deep · 5 km away
  27. 1.65 km SW of Cobb, California · 14413 days ago · 0 km deep · 5 km away
  28. 1.611 km S of Kelseyville, California · 14412 days ago · 0 km deep · 9 km away
  29. 2.45 km WNW of Cobb, California · 14412 days ago · 1 km deep · 1 km away
  30. 1.8Northern California · 14412 days ago · 6 km deep · 29 km away
  31. 2.96 km ENE of Willits, California · 14411 days ago · 4 km deep · 80 km away
  32. 1.76 km ENE of Willits, California · 14411 days ago · 3 km deep · 80 km away
  33. 1.56 km ENE of Willits, California · 14411 days ago · 4 km deep · 80 km away
  34. 2.86 km ENE of Willits, California · 14411 days ago · 3 km deep · 80 km away
  35. 2.56 km ENE of Willits, California · 14411 days ago · 3 km deep · 80 km away
  36. 2.36 km ENE of Willits, California · 14411 days ago · 3 km deep · 80 km away
  37. 1.76 km ENE of Willits, California · 14411 days ago · 3 km deep · 80 km away
  38. 1.83 km SW of Cobb, California · 14411 days ago · 0 km deep · 5 km away
  39. 1.720 km ENE of Potter Valley, California · 14411 days ago · 7 km deep · 64 km away
  40. 1.67 km ENE of Talmage, California · 14410 days ago · 4 km deep · 46 km away
  41. 1.64 km WSW of Cobb, California · 14410 days ago · 2 km deep · 2 km away
  42. 2.66 km W of Cobb, California · 14409 days ago · 3 km deep · 2 km away
  43. 2.47 km W of Cobb, California · 14409 days ago · 1 km deep · 3 km away
  44. 1.95 km W of Cobb, California · 14408 days ago · 1 km deep · 1 km away
  45. 2.16 km W of Cobb, California · 14408 days ago · 4 km deep · 2 km away
  46. 1.9Northern California · 14408 days ago · 0 km deep · 4 km away
  47. 1.86 km W of Cobb, California · 14408 days ago · 3 km deep · 2 km away
  48. 1.62 km ESE of Calpella, California · 14407 days ago · 5 km deep · 56 km away
  49. 1.97 km W of Cobb, California · 14407 days ago · 4 km deep · 3 km away
  50. 1.87 km W of Cobb, California · 14407 days ago · 4 km deep · 3 km away
  51. 2.06 km SW of Cobb, California · 14406 days ago · 3 km deep · 5 km away
  52. 1.67 km W of Cobb, California · 14406 days ago · 3 km deep · 3 km away
  53. 1.65 km SW of Cobb, California · 14406 days ago · 0 km deep · 5 km away
  54. 1.66 km W of Cobb, California · 14406 days ago · 2 km deep · 1 km away
  55. 1.87 km WSW of Cobb, California · 14405 days ago · 1 km deep · 4 km away
  56. 1.95 km SSW of Cobb, California · 14405 days ago · 0 km deep · 6 km away
  57. 1.67 km W of Cobb, California · 14405 days ago · 1 km deep · 3 km away
  58. 1.83 km W of Cobb, California · 14405 days ago · 1 km deep · 1 km away
  59. 1.86 km SW of Cobb, California · 14405 days ago · 2 km deep · 4 km away
  60. 2.16 km W of Cobb, California · 14405 days ago · 3 km deep · 2 km away

The first 60 of 171.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc96997. Read Tue, Sep 22, 2026, 7:51 PM UTC.