California earthquakes

M2.7 earthquake 4 km W of Cobb, California

A magnitude 2.7 earthquake struck 4 km W of Cobb, California on Sun, Apr 28, 1985, 6:37 PM PDT (01:37 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M2.8 8 km WSW of Meridian, 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
2.7 (md), micro
Local time
UTC
1985-04-29 01:37:26 UTC
Depth
0.2 km (0.1 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 0.2 km horizontally, 0.7 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
40°
Stations used
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 186 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 2.07 km WSW of Cobb, California · 15105 days ago · 2 km deep · 4 km away
  2. 1.56 km NW of Cobb, California · 15105 days ago · 1 km deep · 4 km away
  3. 2.46 km W of Cobb, California · 15105 days ago · 3 km deep · 2 km away
  4. 1.76 km W of Cobb, California · 15105 days ago · 3 km deep · 2 km away
  5. 1.59 km W of Cobb, California · 15104 days ago · 1 km deep · 5 km away
  6. 2.48 km WSW of Cobb, California · 15104 days ago · 3 km deep · 4 km away
  7. 1.87 km WSW of Cobb, California · 15104 days ago · 3 km deep · 4 km away
  8. 2.37 km WSW of Cobb, California · 15104 days ago · 4 km deep · 4 km away
  9. 1.820 km ENE of Clearlake, California · 15104 days ago · 6 km deep · 39 km away
  10. 1.67 km WSW of Cobb, California · 15104 days ago · 1 km deep · 4 km away
  11. 2.14 km ENE of Hopland, California · 15103 days ago · 3 km deep · 31 km away
  12. 2.08 km WSW of Cobb, California · 15103 days ago · 3 km deep · 5 km away
  13. 1.612 km WSW of Williams, CA · 15103 days ago · 7 km deep · 53 km away
  14. 1.710 km WSW of Cobb, California · 15102 days ago · 1 km deep · 6 km away
  15. 2.88 km WSW of Meridian, California · 15102 days ago · 0 km deep · 74 km away
  16. 1.71 km ESE of Angwin, California · 15101 days ago · 8 km deep · 42 km away
  17. 2.35 km W of Cobb, California · 15101 days ago · 0 km deep · 1 km away
  18. 1.95 km W of Cobb, California · 15101 days ago · 0 km deep · 1 km away
  19. 1.95 km W of Cobb, California · 15101 days ago · 0 km deep · 1 km away
  20. 2.35 km W of Meridian, California · 15100 days ago · 9 km deep · 77 km away
  21. 2.66 km SSW of Colusa, California · 15100 days ago · 21 km deep · 74 km away
  22. 1.52 km N of Healdsburg, California · 15100 days ago · 4 km deep · 24 km away
  23. 1.84 km SW of Albion, California · 15100 days ago · 1 km deep · 98 km away
  24. 1.57 km W of Cobb, California · 15100 days ago · 4 km deep · 3 km away
  25. 1.66 km W of Cobb, California · 15100 days ago · 2 km deep · 2 km away
  26. 1.72 km NW of Healdsburg, California · 15100 days ago · 7 km deep · 24 km away
  27. 3.28 km SSW of Colusa, California · 15100 days ago · 20 km deep · 73 km away
  28. 2.710 km WSW of Meridian, California · 15100 days ago · 8 km deep · 72 km away
  29. 2.56 km SSW of Colusa, California · 15100 days ago · 12 km deep · 74 km away
  30. 3.37 km SSW of Colusa, California · 15100 days ago · 21 km deep · 74 km away
  31. 2.26 km S of Colusa, California · 15100 days ago · 13 km deep · 75 km away
  32. 2.37 km WSW of Cobb, California · 15100 days ago · 4 km deep · 4 km away
  33. 1.69 km NE of Hopland, California · 15099 days ago · 6 km deep · 33 km away
  34. 2.0Northern California · 15099 days ago · 6 km deep · 79 km away
  35. 2.46 km WSW of Meridian, California · 15099 days ago · 7 km deep · 76 km away
  36. 3.09 km W of Meridian, California · 15099 days ago · 23 km deep · 73 km away
  37. 2.210 km ESE of Williams, California · 15099 days ago · 14 km deep · 71 km away
  38. 1.57 km E of Williams, California · 15099 days ago · 3 km deep · 72 km away
  39. 1.84 km W of Cobb, California · 15099 days ago · 0 km deep · 1 km away
  40. 1.95 km W of Cobb, California · 15099 days ago · 1 km deep · 1 km away
  41. 2.37 km W of Cobb, California · 15098 days ago · 0 km deep · 3 km away
  42. 1.99 km W of Cobb, California · 15098 days ago · 0 km deep · 5 km away
  43. 1.67 km W of Cobb, California · 15097 days ago · 3 km deep · 3 km away
  44. 3.07 km WSW of Cobb, California · 15097 days ago · 4 km deep · 5 km away
  45. 2.06 km W of Cobb, California · 15096 days ago · 3 km deep · 2 km away
  46. 2.16 km W of Cobb, California · 15096 days ago · 4 km deep · 2 km away
  47. 1.66 km W of Cobb, California · 15096 days ago · 3 km deep · 2 km away
  48. 1.88 km WSW of Cobb, California · 15096 days ago · 1 km deep · 5 km away
  49. 2.614 km N of Upper Lake, California · 15096 days ago · 9 km deep · 53 km away
  50. 1.913 km N of Upper Lake, California · 15096 days ago · 8 km deep · 53 km away
  51. 2.47 km SW of Colusa, California · 15095 days ago · 25 km deep · 72 km away
  52. 2.38 km SSW of Colusa, California · 15095 days ago · 28 km deep · 73 km away
  53. 2.316 km NNE of Angwin, California · 15095 days ago · -1 km deep · 35 km away
  54. 2.26 km W of Cobb, California · 15094 days ago · 3 km deep · 2 km away
  55. 2.16 km W of Cobb, California · 15094 days ago · 3 km deep · 2 km away
  56. 3.012 km ESE of Hidden Valley Lake, California · 15094 days ago · 8 km deep · 31 km away
  57. 2.55 km SW of Cobb, California · 15094 days ago · 2 km deep · 4 km away
  58. 1.713 km SE of Hidden Valley Lake, California · 15094 days ago · 3 km deep · 32 km away
  59. 1.65 km SW of Cobb, California · 15094 days ago · 1 km deep · 5 km away
  60. 2.25 km SW of Cobb, California · 15094 days ago · 0 km deep · 5 km away

The first 60 of 186.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc46879. Read Tue, Sep 22, 2026, 5:16 PM UTC.