California earthquakes

M1.9 earthquake 6 km W of Cobb, California

A magnitude 1.9 earthquake struck 6 km W of Cobb, California on Sun, Jan 4, 1987, 3:50 AM PST (11:50 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.1 4 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
1.9 (md), micro
Local time
UTC
1987-01-04 11:50:58 UTC
Depth
3.2 km (2.0 mi), shallow
Epicenter
38.819° 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 0.2 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
47°
Stations used
18

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 172 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 2.14 km WSW of Cobb, California · 14501 days ago · 1 km deep · 3 km away
  2. 1.75 km ESE of Talmage, California · 14501 days ago · 5 km deep · 42 km away
  3. 1.54 km N of Port Costa, California · 14501 days ago · 13 km deep · 98 km away
  4. 1.87 km NW of Yolo, California · 14500 days ago · 5 km deep · 81 km away
  5. 2.75 km W of Cobb, California · 14500 days ago · 1 km deep · 2 km away
  6. 2.36 km WSW of Cobb, California · 14500 days ago · 2 km deep · 1 km away
  7. 1.59 km ESE of Hidden Valley Lake, California · 14500 days ago · 7 km deep · 30 km away
  8. 2.23 km N of Port Costa, California · 14499 days ago · 8 km deep · 98 km away
  9. 1.74 km WSW of Cobb, California · 14499 days ago · 1 km deep · 2 km away
  10. 1.65 km WSW of Cobb, California · 14498 days ago · 1 km deep · 2 km away
  11. 1.64 km WNW of Cobb, California · 14498 days ago · 2 km deep · 2 km away
  12. 1.68 km W of Cobb, California · 14497 days ago · 2 km deep · 2 km away
  13. 2.28 km ENE of Hopland, California · 14497 days ago · 6 km deep · 29 km away
  14. 1.73 km SW of Cobb, California · 14496 days ago · 1 km deep · 5 km away
  15. 1.66 km W of Cobb, California · 14496 days ago · 2 km deep · 1 km away
  16. 1.98 km WSW of Cobb, California · 14496 days ago · 3 km deep · 3 km away
  17. 1.710 km NNW of Redwood Valley, California · 14495 days ago · 4 km deep · 71 km away
  18. 2.82 km E of Rohnert Park, California · 14495 days ago · 5 km deep · 54 km away
  19. 2.13 km ESE of Rohnert Park, California · 14495 days ago · 0 km deep · 56 km away
  20. 1.710 km SSW of Cloverdale, California · 14495 days ago · 30 km deep · 26 km away
  21. 1.82 km E of Rohnert Park, California · 14495 days ago · 3 km deep · 54 km away
  22. 1.77 km E of Hidden Valley Lake, California · 14495 days ago · 8 km deep · 28 km away
  23. 2.97 km W of Cobb, California · 14495 days ago · 4 km deep · 1 km away
  24. 2.47 km W of Cobb, California · 14495 days ago · 4 km deep · 1 km away
  25. 2.82 km ENE of Rohnert Park, California · 14495 days ago · 6 km deep · 54 km away
  26. 2.010 km E of Hidden Valley Lake, California · 14495 days ago · 10 km deep · 31 km away
  27. 1.91 km ENE of Rohnert Park, California · 14495 days ago · 3 km deep · 54 km away
  28. 2.27 km E of Hidden Valley Lake, California · 14495 days ago · 8 km deep · 28 km away
  29. 2.02 km ENE of Rohnert Park, California · 14494 days ago · 3 km deep · 54 km away
  30. 1.86 km NE of Windsor, California · 14494 days ago · 3 km deep · 26 km away
  31. 1.61 km E of Roseland, California · 14494 days ago · 17 km deep · 45 km away
  32. 1.62 km ENE of Penngrove, California · 14494 days ago · 0 km deep · 58 km away
  33. 1.56 km E of Cloverdale, California · 14494 days ago · 0 km deep · 12 km away
  34. 1.66 km W of Cobb, California · 14493 days ago · 2 km deep · 1 km away
  35. 1.75 km SW of Cobb, California · 14493 days ago · 1 km deep · 4 km away
  36. 1.76 km W of Cobb, California · 14492 days ago · 2 km deep · 1 km away
  37. 1.86 km W of Cobb, California · 14492 days ago · 3 km deep · 0 km away
  38. 1.56 km W of Cobb, California · 14492 days ago · 0 km deep · 1 km away
  39. 1.86 km W of Cobb, California · 14492 days ago · 1 km deep · 1 km away
  40. 1.89 km W of Cobb, California · 14492 days ago · 0 km deep · 3 km away
  41. 1.712 km ENE of Cloverdale, California · 14491 days ago · 0 km deep · 8 km away
  42. 1.75 km WNW of Cobb, California · 14491 days ago · 0 km deep · 2 km away
  43. 1.88 km E of Hidden Valley Lake, California · 14490 days ago · 8 km deep · 30 km away
  44. 2.48 km E of Hidden Valley Lake, California · 14490 days ago · 9 km deep · 29 km away
  45. 1.811 km E of Black Point-Green Point, California · 14490 days ago · 16 km deep · 88 km away
  46. 1.77 km NE of Healdsburg, California · 14490 days ago · 2 km deep · 18 km away
  47. 1.916 km SE of Sea Ranch, California · 14489 days ago · 4 km deep · 54 km away
  48. 1.64 km WSW of Cobb, California · 14489 days ago · 1 km deep · 3 km away
  49. 1.67 km W of Cobb, California · 14488 days ago · 0 km deep · 1 km away
  50. 2.13 km WSW of Green Valley, California · 14488 days ago · 8 km deep · 83 km away
  51. 1.96 km W of Cobb, California · 14488 days ago · -1 km deep · 1 km away
  52. 2.15 km WSW of Cobb, California · 14487 days ago · -1 km deep · 3 km away
  53. 1.98 km W of Cobb, California · 14487 days ago · 1 km deep · 2 km away
  54. 1.86 km W of Cobb, California · 14487 days ago · -1 km deep · 1 km away
  55. 2.27 km WSW of Cobb, California · 14487 days ago · 3 km deep · 3 km away
  56. 2.37 km WSW of Cobb, California · 14486 days ago · 3 km deep · 3 km away
  57. 1.79 km ESE of Hidden Valley Lake, California · 14486 days ago · 7 km deep · 30 km away
  58. 2.35 km W of Cobb, California · 14486 days ago · 1 km deep · 1 km away
  59. 2.17 km ENE of Rohnert Park, California · 14486 days ago · 4 km deep · 52 km away
  60. 2.26 km WNW of Cobb, California · 14485 days ago · -1 km deep · 2 km away

The first 60 of 172.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc91715. Read Tue, Sep 22, 2026, 8:54 AM UTC.