California earthquakes

M1.6 earthquake 6 km W of Cobb, California

A magnitude 1.6 earthquake struck 6 km W of Cobb, California on Wed, Feb 27, 1985, 12:37 AM PST (08:37 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M4.1 11 km NNE of Cloverdale, 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
1.6 (md), micro
Local time
UTC
1985-02-27 08:37:58 UTC
Depth
3.0 km (1.9 mi), shallow
Epicenter
38.824° N, 122.799° 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, 0.4 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
78°
Stations used
17

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 188 in the 60 days after this one and 110 in the 30 days before it.

After

  1. 1.86 km NW of North Lakeport, California · 15188 days ago · 1 km deep · 36 km away
  2. 1.86 km W of Cobb, California · 15188 days ago · 3 km deep · 1 km away
  3. 1.87 km WSW of Cobb, California · 15188 days ago · 1 km deep · 2 km away
  4. 2.45 km SW of Cobb, California · 15187 days ago · 2 km deep · 4 km away
  5. 1.76 km NW of North Lakeport, California · 15187 days ago · 5 km deep · 36 km away
  6. 2.38 km W of Cobb, California · 15186 days ago · 0 km deep · 2 km away
  7. 1.98 km W of Cobb, California · 15186 days ago · 0 km deep · 3 km away
  8. 2.52 km SSE of Clear Lake Riviera, California · 15186 days ago · 1 km deep · 14 km away
  9. 1.90 km NNE of Clearlake, California · 15186 days ago · 4 km deep · 22 km away
  10. 1.5Northern California · 15186 days ago · -1 km deep · 13 km away
  11. 2.15 km SW of Cobb, California · 15186 days ago · 1 km deep · 6 km away
  12. 1.67 km W of Cobb, California · 15186 days ago · 3 km deep · 1 km away
  13. 1.64 km WSW of Cobb, California · 15186 days ago · 1 km deep · 3 km away
  14. 1.53 km ESE of Kenwood, California · 15185 days ago · 8 km deep · 54 km away
  15. 1.77 km W of Cobb, California · 15185 days ago · 3 km deep · 1 km away
  16. 2.02 km SE of Clear Lake Riviera, California · 15184 days ago · 2 km deep · 15 km away
  17. 2.77 km WSW of Cobb, California · 15184 days ago · 2 km deep · 2 km away
  18. 1.87 km WSW of Cobb, California · 15184 days ago · 2 km deep · 2 km away
  19. 3.1Northern California · 15183 days ago · 3 km deep · 0 km away
  20. 2.46 km NNE of Cloverdale, California · 15183 days ago · 18 km deep · 16 km away
  21. 1.56 km W of Cobb, California · 15183 days ago · 3 km deep · 0 km away
  22. 1.67 km W of Cobb, California · 15183 days ago · 4 km deep · 1 km away
  23. 1.7Northern California · 15182 days ago · 5 km deep · 14 km away
  24. 2.82 km SE of Clear Lake Riviera, California · 15182 days ago · 2 km deep · 15 km away
  25. 3.52 km SE of Clear Lake Riviera, California · 15182 days ago · 2 km deep · 15 km away
  26. 2.94 km SE of Clear Lake Riviera, California · 15182 days ago · -1 km deep · 14 km away
  27. 1.82 km SE of Clear Lake Riviera, California · 15182 days ago · 1 km deep · 15 km away
  28. 1.92 km S of Clear Lake Riviera, California · 15182 days ago · -1 km deep · 14 km away
  29. 1.93 km SE of Clear Lake Riviera, California · 15182 days ago · 2 km deep · 15 km away
  30. 1.92 km ESE of Clear Lake Riviera, California · 15182 days ago · 4 km deep · 17 km away
  31. 1.63 km SSE of Clear Lake Riviera, California · 15182 days ago · 2 km deep · 14 km away
  32. 1.61 km NNE of Clear Lake Riviera, California · 15182 days ago · 4 km deep · 18 km away
  33. 2.22 km SE of Clear Lake Riviera, California · 15182 days ago · 2 km deep · 15 km away
  34. 1.83 km SSW of Clear Lake Riviera, California · 15182 days ago · -1 km deep · 12 km away
  35. 2.52 km SE of Clear Lake Riviera, California · 15182 days ago · 2 km deep · 15 km away
  36. 2.11 km SSE of Clear Lake Riviera, California · 15182 days ago · 0 km deep · 15 km away
  37. 1.92 km SSE of Clear Lake Riviera, California · 15182 days ago · 0 km deep · 14 km away
  38. 1.82 km SSE of Hopland, California · 15182 days ago · 20 km deep · 30 km away
  39. 1.82 km SSE of Clear Lake Riviera, California · 15182 days ago · 1 km deep · 14 km away
  40. 2.02 km SSE of Clear Lake Riviera, California · 15182 days ago · 2 km deep · 15 km away
  41. 2.83 km SSE of Clear Lake Riviera, California · 15182 days ago · 2 km deep · 14 km away
  42. 2.83 km SSE of Clear Lake Riviera, California · 15182 days ago · 2 km deep · 14 km away
  43. 2.53 km S of Clear Lake Riviera, California · 15182 days ago · 0 km deep · 13 km away
  44. 1.63 km ESE of Clear Lake Riviera, California · 15182 days ago · 2 km deep · 17 km away
  45. 2.13 km SSE of Clear Lake Riviera, California · 15182 days ago · 3 km deep · 14 km away
  46. 1.52 km SSE of Clear Lake Riviera, California · 15181 days ago · 2 km deep · 15 km away
  47. 1.62 km SE of Clear Lake Riviera, California · 15181 days ago · 4 km deep · 15 km away
  48. 1.52 km SSE of Clear Lake Riviera, California · 15181 days ago · 3 km deep · 15 km away
  49. 2.02 km SE of Clear Lake Riviera, California · 15181 days ago · 2 km deep · 15 km away
  50. 1.812 km ENE of Sea Ranch, California · 15181 days ago · 4 km deep · 47 km away
  51. 1.86 km W of Cobb, California · 15181 days ago · 2 km deep · 1 km away
  52. 1.6Northern California · 15181 days ago · 3 km deep · 15 km away
  53. 1.83 km ESE of Clear Lake Riviera, California · 15181 days ago · -1 km deep · 16 km away
  54. 2.52 km SSE of Clear Lake Riviera, California · 15181 days ago · 0 km deep · 15 km away
  55. 2.45 km SW of Cobb, California · 15181 days ago · 0 km deep · 4 km away
  56. 1.84 km ESE of Clear Lake Riviera, California · 15181 days ago · 5 km deep · 17 km away
  57. 1.66 km SSE of Kelseyville, California · 15181 days ago · 4 km deep · 11 km away
  58. 2.15 km WSW of Clear Lake Riviera, California · 15180 days ago · 4 km deep · 12 km away
  59. 1.86 km WSW of Cobb, California · 15180 days ago · 4 km deep · 2 km away
  60. 1.610 km W of Cobb, California · 15180 days ago · 8 km deep · 4 km away

The first 60 of 188.

Before

  1. 1.79 km ESE of Black Point-Green Point, California · 15188 days ago · 14 km deep · 89 km away
  2. 2.04 km NNE of Clearlake, California · 15189 days ago · 1 km deep · 25 km away
  3. 2.24 km NNE of Clearlake, California · 15189 days ago · 1 km deep · 26 km away
  4. 2.34 km WSW of Cobb, California · 15189 days ago · 1 km deep · 3 km away
  5. 3.110 km NW of Cobb, California · 15190 days ago · 8 km deep · 7 km away
  6. 1.87 km W of Cobb, California · 15190 days ago · -1 km deep · 1 km away
  7. 2.78 km W of Cobb, California · 15190 days ago · 0 km deep · 2 km away
  8. 2.03 km W of Forestville, California · 15190 days ago · 0 km deep · 41 km away
  9. 1.76 km ENE of Santa Rosa, California · 15191 days ago · 10 km deep · 43 km away
  10. 2.47 km W of Cobb, California · 15191 days ago · 3 km deep · 1 km away
  11. 2.16 km W of Cobb, California · 15191 days ago · 3 km deep · 1 km away
  12. 1.5Northern California · 15191 days ago · 1 km deep · 4 km away
  13. 1.67 km WSW of Cobb, California · 15192 days ago · 1 km deep · 2 km away
  14. 2.17 km WSW of Cobb, California · 15192 days ago · 4 km deep · 3 km away
  15. 1.56 km WSW of Cobb, California · 15192 days ago · 1 km deep · 3 km away
  16. 2.04 km SW of Clear Lake Riviera, California · 15193 days ago · 2 km deep · 12 km away
  17. 1.86 km W of Cobb, California · 15193 days ago · 2 km deep · 1 km away
  18. 2.03 km NNE of Cloverdale, California · 15194 days ago · 3 km deep · 18 km away
  19. 2.25 km W of Cobb, California · 15194 days ago · 0 km deep · 1 km away
  20. 1.9Northern California · 15194 days ago · 3 km deep · 12 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc42234. Read Mon, Sep 28, 2026, 4:57 PM UTC.