California earthquakes

M1.9 earthquake 6 km WSW of Cobb, California

A magnitude 1.9 earthquake struck 6 km WSW of Cobb, California on Mon, Aug 30, 1976, 9:21 PM PDT (04:21 UTC), -1 km (-1 mi) below the surface.

A larger quake followed: M3.0 32 km NNE of Potter Valley, 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, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1976-08-31 04:21:19 UTC
Depth
-1.0 km (-0.6 mi), shallow
Epicenter
38.805° N, 122.791° 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, 0.6 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
64°
Stations used
21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 79 in the 60 days after this one and 54 in the 30 days before it.

After

  1. 2.421 km NNE of Upper Lake, California · 18295 days ago · 4 km deep · 61 km away
  2. 1.93 km E of Larkfield-Wikiup, California · 18295 days ago · 8 km deep · 33 km away
  3. 2.112 km NNE of Angwin, California · 18293 days ago · 11 km deep · 39 km away
  4. 2.720 km WSW of Stonyford, California · 18292 days ago · 12 km deep · 56 km away
  5. 1.79 km WNW of Cobb, California · 18292 days ago · -1 km deep · 7 km away
  6. 2.02 km ENE of Clear Lake Riviera, California · 18292 days ago · 4 km deep · 19 km away
  7. 1.84 km WNW of Clearlake, California · 18292 days ago · 6 km deep · 21 km away
  8. 1.72 km ESE of Clear Lake Riviera, California · 18292 days ago · 7 km deep · 17 km away
  9. 1.82 km NE of Clear Lake Riviera, California · 18292 days ago · 3 km deep · 20 km away
  10. 1.93 km NE of Clear Lake Riviera, California · 18291 days ago · 3 km deep · 21 km away
  11. 1.62 km ENE of Clear Lake Riviera, California · 18291 days ago · 4 km deep · 19 km away
  12. 1.62 km NE of Clear Lake Riviera, California · 18291 days ago · 3 km deep · 20 km away
  13. 1.72 km ENE of Clear Lake Riviera, California · 18291 days ago · 4 km deep · 19 km away
  14. 2.58 km E of Larkfield-Wikiup, California · 18291 days ago · 4 km deep · 34 km away
  15. 1.72 km ESE of Clear Lake Riviera, California · 18288 days ago · 1 km deep · 18 km away
  16. 1.54 km WSW of Cobb, California · 18288 days ago · 4 km deep · 2 km away
  17. 2.84 km SW of Green Valley, California · 18287 days ago · 7 km deep · 83 km away
  18. 1.77 km WSW of Cobb, California · 18285 days ago · 2 km deep · 2 km away
  19. 2.14 km WSW of Cobb, California · 18285 days ago · -1 km deep · 1 km away
  20. 1.96 km E of Santa Rosa, California · 18285 days ago · 10 km deep · 44 km away
  21. 2.07 km WSW of Cobb, California · 18285 days ago · 1 km deep · 2 km away
  22. 1.73 km NNW of Clear Lake Riviera, California · 18284 days ago · 2 km deep · 20 km away
  23. 2.013 km NNE of Angwin, California · 18282 days ago · 12 km deep · 38 km away
  24. 2.311 km E of Potter Valley, California · 18282 days ago · 3 km deep · 60 km away
  25. 2.95 km NE of Santa Rosa, California · 18281 days ago · 8 km deep · 38 km away
  26. 1.78 km W of Cobb, California · 18281 days ago · 0 km deep · 3 km away
  27. 3.032 km NNE of Potter Valley, California · 18279 days ago · 15 km deep · 86 km away
  28. 2.114 km SE of Sea Ranch, California · 18277 days ago · 7 km deep · 54 km away
  29. 1.66 km W of Cobb, California · 18276 days ago · -1 km deep · 1 km away
  30. 1.96 km W of Cobb, California · 18275 days ago · 4 km deep · 1 km away
  31. 1.67 km W of Cobb, California · 18275 days ago · 0 km deep · 3 km away
  32. 2.46 km W of Cobb, California · 18274 days ago · 3 km deep · 1 km away
  33. 2.56 km NNE of Penngrove, California · 18272 days ago · 7 km deep · 53 km away
  34. 2.24 km SW of Cobb, California · 18270 days ago · 0 km deep · 3 km away
  35. 1.67 km WSW of Cobb, California · 18270 days ago · 3 km deep · 1 km away
  36. 1.68 km W of Cobb, California · 18270 days ago · -1 km deep · 3 km away
  37. 1.94 km WSW of Cobb, California · 18270 days ago · 2 km deep · 2 km away
  38. 1.57 km WSW of Cobb, California · 18269 days ago · 2 km deep · 1 km away
  39. 1.87 km W of Cobb, California · 18268 days ago · 3 km deep · 2 km away
  40. 2.318 km WSW of Stonyford, California · 18268 days ago · 11 km deep · 58 km away
  41. 1.56 km W of Cobb, California · 18268 days ago · 3 km deep · 2 km away
  42. 1.610 km WSW of Cobb, California · 18268 days ago · 3 km deep · 5 km away
  43. 2.33 km NE of Santa Rosa, California · 18267 days ago · 9 km deep · 39 km away
  44. 1.95 km WSW of Cobb, California · 18266 days ago · 0 km deep · 0 km away
  45. 1.96 km WSW of Cobb, California · 18264 days ago · 1 km deep · 1 km away
  46. 2.118 km SW of Stonyford, California · 18263 days ago · 9 km deep · 51 km away
  47. 1.84 km WSW of Cobb, California · 18263 days ago · 1 km deep · 2 km away
  48. 1.84 km WSW of Cobb, California · 18263 days ago · 1 km deep · 2 km away
  49. 2.08 km W of Cobb, California · 18263 days ago · 0 km deep · 3 km away
  50. 1.76 km W of Cobb, California · 18263 days ago · 3 km deep · 2 km away
  51. 1.64 km WSW of Cobb, California · 18261 days ago · 1 km deep · 2 km away
  52. 1.71 km NE of Clear Lake Riviera, California · 18261 days ago · 0 km deep · 19 km away
  53. 2.38 km W of Healdsburg, California · 18260 days ago · 0 km deep · 25 km away
  54. 1.77 km W of Cobb, California · 18260 days ago · -1 km deep · 1 km away
  55. 1.77 km W of Cobb, California · 18259 days ago · 1 km deep · 2 km away
  56. 1.75 km E of Hopland, California · 18258 days ago · 5 km deep · 29 km away
  57. 2.54 km SSE of Clear Lake Riviera, California · 18258 days ago · 4 km deep · 15 km away
  58. 1.79 km SE of Hopland, California · 18258 days ago · 1 km deep · 24 km away
  59. 1.76 km NW of Cobb, California · 18256 days ago · 2 km deep · 7 km away
  60. 1.67 km W of Cobb, California · 18255 days ago · 3 km deep · 2 km away

The first 60 of 79.

Before

  1. 1.6Northern California · 18297 days ago · 3 km deep · 1 km away
  2. 1.59 km W of Cobb, California · 18297 days ago · 0 km deep · 4 km away
  3. 2.417 km W of Stonyford, California · 18298 days ago · 11 km deep · 61 km away
  4. 1.76 km WSW of Cobb, California · 18298 days ago · 1 km deep · 0 km away
  5. 1.81 km S of Sea Ranch, California · 18299 days ago · 1 km deep · 59 km away
  6. 1.88 km WSW of Cobb, California · 18300 days ago · 4 km deep · 2 km away
  7. 2.49 km E of Hidden Valley Lake, California · 18300 days ago · 8 km deep · 30 km away
  8. 1.85 km WSW of Cobb, California · 18301 days ago · 0 km deep · 1 km away
  9. 1.610 km N of Cloverdale, California · 18301 days ago · 3 km deep · 22 km away
  10. 1.57 km WSW of Cobb, California · 18302 days ago · 1 km deep · 1 km away
  11. 2.49 km W of Cobb, California · 18302 days ago · 0 km deep · 3 km away
  12. 1.74 km WSW of Cobb, California · 18303 days ago · 2 km deep · 2 km away
  13. 1.68 km WSW of Cobb, California · 18303 days ago · -1 km deep · 3 km away
  14. 1.88 km WSW of Cobb, California · 18303 days ago · 0 km deep · 2 km away
  15. 2.27 km WSW of Cobb, California · 18306 days ago · 1 km deep · 1 km away
  16. 1.54 km ENE of Clear Lake Riviera, California · 18306 days ago · 3 km deep · 21 km away
  17. 1.58 km WSW of Cobb, California · 18306 days ago · 4 km deep · 2 km away
  18. 1.66 km W of Cobb, California · 18307 days ago · 2 km deep · 2 km away
  19. 1.53 km SSE of Lower Lake, California · 18307 days ago · 6 km deep · 19 km away
  20. 1.67 km W of Cobb, California · 18307 days ago · 1 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1031261. Read Sun, Oct 4, 2026, 4:27 PM UTC.