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, Jan 17, 1987, 5:45 PM PST (01:45 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.3 5 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
1987-01-18 01:45:16 UTC
Depth
2.8 km (1.7 mi), shallow
Epicenter
38.821° N, 122.798° 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
±0.13
Depth from
From location
Station coverage gap
68°
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: 171 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.79 km ESE of Hidden Valley Lake, California · 14486 days ago · 7 km deep · 30 km away
  2. 2.35 km W of Cobb, California · 14486 days ago · 1 km deep · 1 km away
  3. 2.17 km ENE of Rohnert Park, California · 14486 days ago · 4 km deep · 52 km away
  4. 2.26 km WNW of Cobb, California · 14485 days ago · -1 km deep · 1 km away
  5. 2.16 km W of Cobb, California · 14485 days ago · 1 km deep · 0 km away
  6. 1.711 km ENE of Cloverdale, California · 14485 days ago · 6 km deep · 10 km away
  7. 1.716 km ENE of Potter Valley, California · 14485 days ago · 7 km deep · 63 km away
  8. 3.06 km WSW of Cobb, California · 14485 days ago · 0 km deep · 2 km away
  9. 1.76 km WSW of Cobb, California · 14485 days ago · 1 km deep · 2 km away
  10. 2.46 km WSW of Cobb, California · 14485 days ago · 3 km deep · 2 km away
  11. 1.67 km WSW of Cobb, California · 14485 days ago · 1 km deep · 2 km away
  12. 1.73 km W of Cobb, California · 14484 days ago · 0 km deep · 3 km away
  13. 2.29 km W of Cobb, California · 14484 days ago · -1 km deep · 3 km away
  14. 1.66 km W of Cobb, California · 14483 days ago · 3 km deep · 0 km away
  15. 2.77 km WSW of Cobb, California · 14483 days ago · 0 km deep · 2 km away
  16. 1.66 km WSW of Cobb, California · 14483 days ago · 0 km deep · 2 km away
  17. 1.53 km SW of Cobb, California · 14483 days ago · 0 km deep · 5 km away
  18. 1.66 km WNW of Cobb, California · 14483 days ago · 0 km deep · 2 km away
  19. 1.86 km W of Cobb, California · 14482 days ago · 3 km deep · 0 km away
  20. 1.86 km W of Cobb, California · 14482 days ago · 1 km deep · 1 km away
  21. 2.15 km SW of Cobb, California · 14482 days ago · 2 km deep · 5 km away
  22. 1.96 km W of Cobb, California · 14482 days ago · 3 km deep · 0 km away
  23. 2.05 km WNW of Cobb, California · 14481 days ago · 1 km deep · 3 km away
  24. 2.4Northern California · 14481 days ago · -1 km deep · 36 km away
  25. 2.05 km SW of Cobb, California · 14479 days ago · 0 km deep · 4 km away
  26. 1.96 km W of Cobb, California · 14478 days ago · 3 km deep · 0 km away
  27. 2.06 km W of Cobb, California · 14477 days ago · 0 km deep · 0 km away
  28. 1.75 km W of Cobb, California · 14477 days ago · 1 km deep · 1 km away
  29. 1.56 km WSW of Cobb, California · 14476 days ago · 4 km deep · 1 km away
  30. 1.85 km WNW of Cobb, California · 14476 days ago · 2 km deep · 3 km away
  31. 1.87 km W of Cobb, California · 14476 days ago · 0 km deep · 1 km away
  32. 1.54 km W of Cobb, California · 14475 days ago · -1 km deep · 2 km away
  33. 1.99 km W of Cobb, California · 14475 days ago · 4 km deep · 3 km away
  34. 2.09 km W of Cobb, California · 14474 days ago · 0 km deep · 3 km away
  35. 2.09 km W of Cobb, California · 14474 days ago · -1 km deep · 3 km away
  36. 1.66 km W of Cobb, California · 14474 days ago · 3 km deep · 0 km away
  37. 2.011 km NE of Talmage, California · 14474 days ago · 7 km deep · 48 km away
  38. 1.65 km W of Cobb, California · 14473 days ago · 0 km deep · 1 km away
  39. 1.65 km SW of Cobb, California · 14472 days ago · 1 km deep · 4 km away
  40. 1.7Northern California · 14471 days ago · 0 km deep · 2 km away
  41. 2.06 km W of Cobb, California · 14470 days ago · 3 km deep · 1 km away
  42. 1.918 km E of Sea Ranch, California · 14470 days ago · 0 km deep · 40 km away
  43. 1.67 km W of Cobb, California · 14469 days ago · 3 km deep · 1 km away
  44. 1.88 km W of Cobb, California · 14469 days ago · 0 km deep · 2 km away
  45. 1.98 km W of Cobb, California · 14469 days ago · 1 km deep · 2 km away
  46. 2.46 km E of Hopland, California · 14469 days ago · 7 km deep · 27 km away
  47. 1.67 km WSW of Cobb, California · 14468 days ago · 1 km deep · 2 km away
  48. 1.97 km WSW of Cobb, California · 14468 days ago · 1 km deep · 2 km away
  49. 1.66 km WNW of Cobb, California · 14468 days ago · -1 km deep · 2 km away
  50. 1.88 km WNW of Cobb, California · 14468 days ago · -1 km deep · 4 km away
  51. 2.05 km WSW of Cobb, California · 14467 days ago · 0 km deep · 3 km away
  52. 1.67 km W of Kenwood, California · 14467 days ago · 6 km deep · 47 km away
  53. 2.96 km W of Cobb, California · 14467 days ago · 0 km deep · 1 km away
  54. 1.76 km W of Cobb, California · 14467 days ago · 0 km deep · 1 km away
  55. 3.16 km W of Cobb, California · 14467 days ago · 1 km deep · 1 km away
  56. 1.85 km SW of Cobb, California · 14467 days ago · 2 km deep · 6 km away
  57. 2.014 km ENE of Angwin, California · 14466 days ago · 9 km deep · 47 km away
  58. 2.04 km W of Cobb, California · 14465 days ago · 0 km deep · 2 km away
  59. 2.510 km NW of Cobb, California · 14465 days ago · 0 km deep · 7 km away
  60. 1.68 km WSW of Cobb, California · 14464 days ago · 4 km deep · 3 km away

The first 60 of 171.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1146633. Read Tue, Sep 22, 2026, 10:27 AM UTC.