California earthquakes

M1.8 earthquake 7 km NE of Upper Lake, California

A magnitude 1.8 earthquake struck 7 km NE of Upper Lake, California on Mon, Apr 27, 1987, 8:08 AM PDT (15:08 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M2.6 5 km WSW of Cobb, California. This one was a foreshock.

Upper Lake forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude
1.8 (md), micro
Local time
UTC
1987-04-27 15:08:56 UTC
Depth
6.3 km (3.9 mi), shallow
Epicenter
39.212° N, 122.851° 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, 0.9 km in depth
Magnitude uncertainty
±0.14
Depth from
From location
Station coverage gap
49°
Stations used
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 179 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.62 km SSW of Sutter, California · 14375 days ago · 5 km deep · 94 km away
  2. 1.75 km SW of Cobb, California · 14374 days ago · 2 km deep · 48 km away
  3. 2.65 km WSW of Cobb, California · 14374 days ago · 1 km deep · 45 km away
  4. 1.57 km W of Cobb, California · 14374 days ago · 0 km deep · 45 km away
  5. 1.88 km WSW of Cobb, California · 14374 days ago · 3 km deep · 47 km away
  6. 1.84 km W of Cobb, California · 14374 days ago · -1 km deep · 45 km away
  7. 1.66 km W of Cobb, California · 14373 days ago · 3 km deep · 45 km away
  8. 2.35 km W of Cobb, California · 14373 days ago · 0 km deep · 44 km away
  9. 2.07 km W of Cobb, California · 14373 days ago · 1 km deep · 43 km away
  10. 1.77 km W of Cobb, California · 14373 days ago · 3 km deep · 45 km away
  11. 1.58 km W of Cobb, California · 14373 days ago · -1 km deep · 44 km away
  12. 1.52 km SSE of Calistoga, California · 14372 days ago · 2 km deep · 77 km away
  13. 1.710 km NW of Cobb, California · 14372 days ago · 0 km deep · 38 km away
  14. 2.58 km W of Cobb, California · 14372 days ago · 1 km deep · 44 km away
  15. 1.78 km W of Cobb, California · 14371 days ago · 4 km deep · 43 km away
  16. 2.04 km W of Cobb, California · 14371 days ago · 0 km deep · 44 km away
  17. 2.86 km W of Cobb, California · 14371 days ago · 3 km deep · 44 km away
  18. 1.69 km W of Cobb, California · 14370 days ago · 0 km deep · 44 km away
  19. 2.011 km W of Richvale, California · 14370 days ago · 5 km deep · 89 km away
  20. 1.815 km N of Princeton, California · 14370 days ago · 20 km deep · 82 km away
  21. 1.95 km WSW of Cobb, California · 14370 days ago · 1 km deep · 46 km away
  22. 1.68 km W of Cobb, California · 14370 days ago · -1 km deep · 44 km away
  23. 1.56 km W of Cobb, California · 14370 days ago · 3 km deep · 43 km away
  24. 1.65 km W of Cobb, California · 14370 days ago · -1 km deep · 44 km away
  25. 1.5Northern California · 14370 days ago · 8 km deep · 55 km away
  26. 1.56 km W of Cobb, California · 14369 days ago · 4 km deep · 43 km away
  27. 1.67 km WSW of Cobb, California · 14368 days ago · 1 km deep · 46 km away
  28. 1.710 km NNW of Laytonville, California · 14367 days ago · 4 km deep · 85 km away
  29. 2.14 km W of Cobb, California · 14367 days ago · 0 km deep · 44 km away
  30. 1.86 km W of Cobb, California · 14367 days ago · 3 km deep · 44 km away
  31. 2.39 km W of Cobb, California · 14366 days ago · 0 km deep · 44 km away
  32. 1.78 km W of Cobb, California · 14366 days ago · -1 km deep · 43 km away
  33. 1.86 km W of Cobb, California · 14366 days ago · 3 km deep · 44 km away
  34. 2.09 km W of Cobb, California · 14366 days ago · 0 km deep · 44 km away
  35. 1.6Northern California · 14366 days ago · 4 km deep · 43 km away
  36. 1.85 km WSW of Cobb, California · 14365 days ago · 1 km deep · 46 km away
  37. 2.19 km SE of Sea Ranch, California · 14365 days ago · -1 km deep · 78 km away
  38. 1.8Northern California · 14365 days ago · 9 km deep · 46 km away
  39. 1.75 km SW of Cobb, California · 14365 days ago · 5 km deep · 48 km away
  40. 1.85 km SW of Cobb, California · 14365 days ago · 4 km deep · 49 km away
  41. 1.56 km WSW of Cobb, California · 14365 days ago · 3 km deep · 45 km away
  42. 2.07 km W of Cobb, California · 14364 days ago · 1 km deep · 44 km away
  43. 2.28 km WSW of Cobb, California · 14364 days ago · 2 km deep · 46 km away
  44. 1.77 km WSW of Cobb, California · 14364 days ago · 3 km deep · 46 km away
  45. 1.511 km N of Brooktrails, California · 14364 days ago · 7 km deep · 59 km away
  46. 2.07 km W of Cobb, California · 14364 days ago · 1 km deep · 42 km away
  47. 1.65 km W of Cobb, California · 14363 days ago · 2 km deep · 43 km away
  48. 1.63 km W of Cobb, California · 14363 days ago · 0 km deep · 43 km away
  49. 2.67 km W of Cobb, California · 14363 days ago · 1 km deep · 44 km away
  50. 1.610 km SE of Sea Ranch, California · 14363 days ago · 4 km deep · 76 km away
  51. 1.75 km WNW of Cobb, California · 14363 days ago · 1 km deep · 42 km away
  52. 2.17 km WSW of Cobb, California · 14363 days ago · 1 km deep · 45 km away
  53. 1.75 km WSW of Cobb, California · 14363 days ago · 0 km deep · 47 km away
  54. 1.65 km SW of Cobb, California · 14363 days ago · -1 km deep · 47 km away
  55. 3.35 km WSW of Cobb, California · 14363 days ago · 1 km deep · 47 km away
  56. 2.06 km SW of Cobb, California · 14363 days ago · -1 km deep · 48 km away
  57. 2.95 km WSW of Cobb, California · 14363 days ago · -1 km deep · 47 km away
  58. 1.65 km SW of Cobb, California · 14363 days ago · 0 km deep · 47 km away
  59. 1.66 km SW of Cobb, California · 14362 days ago · 1 km deep · 49 km away
  60. 1.716 km NNE of Upper Lake, California · 14362 days ago · 4 km deep · 10 km away

The first 60 of 179.

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc99326. Read Tue, Sep 22, 2026, 10:23 PM UTC.