California earthquakes

M2.4 earthquake 21 km NNE of Upper Lake, California

A magnitude 2.4 earthquake struck 21 km NNE of Upper Lake, California on Tue, Aug 31, 1976, 10:03 PM PDT (05:03 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.0 32 km NNE of Potter Valley, 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.

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The earthquake

Magnitude
2.4 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1976-09-01 05:03:43 UTC
Depth
3.6 km (2.2 mi), shallow
Epicenter
39.351° N, 122.849° 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 1.7 km horizontally, 1.9 km in depth
Magnitude uncertainty
±0.21
Depth from
From location
Station coverage gap
294°, poorly surrounded by stations
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: 77 in the 60 days after this one and 63 in the 30 days before it.

After

  1. 1.93 km E of Larkfield-Wikiup, California · 18294 days ago · 8 km deep · 94 km away
  2. 2.112 km NNE of Angwin, California · 18292 days ago · 11 km deep · 86 km away
  3. 2.720 km WSW of Stonyford, California · 18291 days ago · 12 km deep · 9 km away
  4. 1.79 km WNW of Cobb, California · 18291 days ago · -1 km deep · 54 km away
  5. 2.02 km ENE of Clear Lake Riviera, California · 18291 days ago · 4 km deep · 45 km away
  6. 1.84 km WNW of Clearlake, California · 18291 days ago · 6 km deep · 45 km away
  7. 1.72 km ESE of Clear Lake Riviera, California · 18291 days ago · 7 km deep · 47 km away
  8. 1.82 km NE of Clear Lake Riviera, California · 18291 days ago · 3 km deep · 45 km away
  9. 1.93 km NE of Clear Lake Riviera, California · 18290 days ago · 3 km deep · 44 km away
  10. 1.62 km ENE of Clear Lake Riviera, California · 18290 days ago · 4 km deep · 45 km away
  11. 1.62 km NE of Clear Lake Riviera, California · 18290 days ago · 3 km deep · 45 km away
  12. 1.72 km ENE of Clear Lake Riviera, California · 18290 days ago · 4 km deep · 45 km away
  13. 2.58 km E of Larkfield-Wikiup, California · 18290 days ago · 4 km deep · 94 km away
  14. 1.72 km ESE of Clear Lake Riviera, California · 18287 days ago · 1 km deep · 47 km away
  15. 1.54 km WSW of Cobb, California · 18287 days ago · 4 km deep · 61 km away
  16. 2.520 km SE of Ruth, California · 18286 days ago · 38 km deep · 91 km away
  17. 1.77 km WSW of Cobb, California · 18284 days ago · 2 km deep · 61 km away
  18. 2.14 km WSW of Cobb, California · 18284 days ago · -1 km deep · 61 km away
  19. 2.07 km WSW of Cobb, California · 18284 days ago · 1 km deep · 61 km away
  20. 1.73 km NNW of Clear Lake Riviera, California · 18283 days ago · 2 km deep · 42 km away
  21. 2.013 km NNE of Angwin, California · 18282 days ago · 12 km deep · 85 km away
  22. 2.311 km E of Potter Valley, California · 18281 days ago · 3 km deep · 12 km away
  23. 2.95 km NE of Santa Rosa, California · 18280 days ago · 8 km deep · 98 km away
  24. 1.78 km W of Cobb, California · 18280 days ago · 0 km deep · 60 km away
  25. 3.032 km NNE of Potter Valley, California · 18278 days ago · 15 km deep · 25 km away
  26. 2.114 km SE of Sea Ranch, California · 18276 days ago · 7 km deep · 94 km away
  27. 1.66 km W of Cobb, California · 18275 days ago · -1 km deep · 60 km away
  28. 1.96 km W of Cobb, California · 18275 days ago · 4 km deep · 60 km away
  29. 1.67 km W of Cobb, California · 18274 days ago · 0 km deep · 59 km away
  30. 2.46 km W of Cobb, California · 18273 days ago · 3 km deep · 60 km away
  31. 2.75 km SSE of Leggett, California · 18270 days ago · 13 km deep · 89 km away
  32. 2.24 km SW of Cobb, California · 18270 days ago · 0 km deep · 62 km away
  33. 1.67 km WSW of Cobb, California · 18269 days ago · 3 km deep · 61 km away
  34. 1.68 km W of Cobb, California · 18269 days ago · -1 km deep · 60 km away
  35. 1.94 km WSW of Cobb, California · 18269 days ago · 2 km deep · 61 km away
  36. 1.57 km WSW of Cobb, California · 18269 days ago · 2 km deep · 61 km away
  37. 1.87 km W of Cobb, California · 18268 days ago · 3 km deep · 60 km away
  38. 2.318 km WSW of Stonyford, California · 18268 days ago · 11 km deep · 9 km away
  39. 1.56 km W of Cobb, California · 18267 days ago · 3 km deep · 59 km away
  40. 1.610 km WSW of Cobb, California · 18267 days ago · 3 km deep · 62 km away
  41. 2.33 km NE of Santa Rosa, California · 18266 days ago · 9 km deep · 100 km away
  42. 1.95 km WSW of Cobb, California · 18265 days ago · 0 km deep · 61 km away
  43. 1.96 km WSW of Cobb, California · 18263 days ago · 1 km deep · 60 km away
  44. 2.118 km SW of Stonyford, California · 18262 days ago · 9 km deep · 16 km away
  45. 1.84 km WSW of Cobb, California · 18262 days ago · 1 km deep · 61 km away
  46. 1.84 km WSW of Cobb, California · 18262 days ago · 1 km deep · 61 km away
  47. 2.08 km W of Cobb, California · 18262 days ago · 0 km deep · 60 km away
  48. 1.76 km W of Cobb, California · 18262 days ago · 3 km deep · 59 km away
  49. 1.64 km WSW of Cobb, California · 18261 days ago · 1 km deep · 61 km away
  50. 1.71 km NE of Clear Lake Riviera, California · 18260 days ago · 0 km deep · 45 km away
  51. 2.38 km W of Healdsburg, California · 18259 days ago · 0 km deep · 82 km away
  52. 1.77 km W of Cobb, California · 18259 days ago · -1 km deep · 60 km away
  53. 1.77 km W of Cobb, California · 18258 days ago · 1 km deep · 59 km away
  54. 1.75 km E of Hopland, California · 18257 days ago · 5 km deep · 46 km away
  55. 2.54 km SSE of Clear Lake Riviera, California · 18257 days ago · 4 km deep · 50 km away
  56. 1.79 km SE of Hopland, California · 18257 days ago · 1 km deep · 51 km away
  57. 1.76 km NW of Cobb, California · 18255 days ago · 2 km deep · 54 km away
  58. 1.67 km W of Cobb, California · 18254 days ago · 3 km deep · 60 km away
  59. 2.56 km W of Cobb, California · 18253 days ago · 4 km deep · 59 km away
  60. 1.56 km W of Cobb, California · 18253 days ago · 3 km deep · 59 km away

The first 60 of 77.

Before

  1. 1.96 km WSW of Cobb, California · 18296 days ago · -1 km deep · 61 km away
  2. 1.6Northern California · 18296 days ago · 3 km deep · 60 km away
  3. 1.59 km W of Cobb, California · 18296 days ago · 0 km deep · 60 km away
  4. 2.417 km W of Stonyford, California · 18297 days ago · 11 km deep · 9 km away
  5. 1.76 km WSW of Cobb, California · 18297 days ago · 1 km deep · 61 km away
  6. 1.81 km S of Sea Ranch, California · 18298 days ago · 1 km deep · 89 km away
  7. 1.88 km WSW of Cobb, California · 18299 days ago · 4 km deep · 62 km away
  8. 2.49 km E of Hidden Valley Lake, California · 18300 days ago · 8 km deep · 68 km away
  9. 1.85 km WSW of Cobb, California · 18300 days ago · 0 km deep · 61 km away
  10. 1.610 km N of Cloverdale, California · 18300 days ago · 3 km deep · 52 km away
  11. 3.28 km N of Leggett, California · 18301 days ago · 4 km deep · 100 km away
  12. 1.57 km WSW of Cobb, California · 18301 days ago · 1 km deep · 61 km away
  13. 2.49 km W of Cobb, California · 18301 days ago · 0 km deep · 60 km away
  14. 2.4near the coast of Northern California · 18301 days ago · 21 km deep · 97 km away
  15. 1.74 km WSW of Cobb, California · 18302 days ago · 2 km deep · 62 km away
  16. 1.68 km WSW of Cobb, California · 18302 days ago · -1 km deep · 61 km away
  17. 1.88 km WSW of Cobb, California · 18302 days ago · 0 km deep · 61 km away
  18. 2.56 km N of Leggett, California · 18302 days ago · 4 km deep · 98 km away
  19. 2.110 km NNE of Leggett, California · 18303 days ago · 7 km deep · 98 km away
  20. 2.67 km NNE of Leggett, California · 18304 days ago · 5 km deep · 96 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1031281. Read Sat, Oct 3, 2026, 5:58 PM UTC.