California earthquakes

M1.7 earthquake 13 km NNE of Angwin, California

A magnitude 1.7 earthquake struck 13 km NNE of Angwin, California on Sat, Aug 8, 1981, 11:41 PM PDT (06:41 UTC), 9 km (5 mi) below the surface.

A larger quake followed: M1.7 6 km W of Cobb, California. This one was a foreshock.

Angwin 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
1.7 (md), micro
Local time
UTC
1981-08-09 06:41:09 UTC
Depth
8.6 km (5.3 mi), shallow
Epicenter
38.688° N, 122.394° 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 0.3 km horizontally, 1.4 km in depth
Magnitude uncertainty
±0.23
Depth from
From location
Station coverage gap
116°
Stations used
13

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 108 in the 60 days after this one and 51 in the 30 days before it.

After

  1. 1.76 km W of Cobb, California · 16482 days ago · 3 km deep · 38 km away
  2. 2.04 km WSW of Cobb, California · 16482 days ago · 4 km deep · 35 km away
  3. 1.66 km ESE of Talmage, California · 16481 days ago · 8 km deep · 77 km away
  4. 2.17 km WSW of Cobb, California · 16481 days ago · 4 km deep · 37 km away
  5. 1.82 km WNW of Cobb, California · 16481 days ago · 0 km deep · 35 km away
  6. 1.78 km WSW of Cobb, California · 16479 days ago · 1 km deep · 39 km away
  7. 1.76 km E of Suisun, California · 16479 days ago · 5 km deep · 63 km away
  8. 1.77 km E of Fairfield, California · 16479 days ago · 5 km deep · 63 km away
  9. 2.110 km N of Moskowite Corner, California · 16479 days ago · 7 km deep · 24 km away
  10. 1.57 km W of Cobb, California · 16478 days ago · 1 km deep · 39 km away
  11. 2.67 km W of Cobb, California · 16478 days ago · 1 km deep · 39 km away
  12. 1.78 km W of Cobb, California · 16478 days ago · 1 km deep · 40 km away
  13. 1.69 km WSW of Cobb, California · 16478 days ago · 2 km deep · 40 km away
  14. 1.69 km WSW of Cobb, California · 16478 days ago · 2 km deep · 39 km away
  15. 1.54 km WNW of Potter Valley, California · 16477 days ago · 9 km deep · 98 km away
  16. 2.09 km WSW of Cobb, California · 16476 days ago · 2 km deep · 40 km away
  17. 2.53 km NNW of Larkfield-Wikiup, California · 16476 days ago · 2 km deep · 37 km away
  18. 1.76 km W of Cobb, California · 16476 days ago · 4 km deep · 38 km away
  19. 2.11 km WSW of Geyserville, California · 16475 days ago · 5 km deep · 46 km away
  20. 1.74 km S of Cobb, California · 16474 days ago · 1 km deep · 31 km away
  21. 2.17 km W of Cobb, California · 16474 days ago · 4 km deep · 39 km away
  22. 1.54 km WNW of Potter Valley, California · 16474 days ago · -1 km deep · 98 km away
  23. 1.93 km NNW of Larkfield-Wikiup, California · 16473 days ago · 3 km deep · 37 km away
  24. 2.27 km W of Cobb, California · 16473 days ago · 4 km deep · 38 km away
  25. 1.74 km S of Cobb, California · 16472 days ago · 1 km deep · 30 km away
  26. 1.8near the coast of Northern California · 16470 days ago · 5 km deep · 90 km away
  27. 2.49 km WSW of Cobb, California · 16470 days ago · 1 km deep · 39 km away
  28. 2.78 km WSW of Cobb, California · 16469 days ago · 2 km deep · 39 km away
  29. 1.79 km WSW of Cobb, California · 16469 days ago · 3 km deep · 39 km away
  30. 1.59 km WSW of Cobb, California · 16469 days ago · 3 km deep · 39 km away
  31. 3.26 km W of Cobb, California · 16469 days ago · 4 km deep · 38 km away
  32. 1.810 km W of Cobb, California · 16468 days ago · -1 km deep · 42 km away
  33. 1.56 km W of Cobb, California · 16468 days ago · 1 km deep · 37 km away
  34. 1.711 km WNW of Cobb, California · 16468 days ago · 1 km deep · 43 km away
  35. 1.66 km WSW of Cobb, California · 16467 days ago · 4 km deep · 37 km away
  36. 1.66 km WSW of Cobb, California · 16467 days ago · 3 km deep · 37 km away
  37. 2.17 km WSW of Cobb, California · 16466 days ago · 0 km deep · 37 km away
  38. 1.87 km WSW of Cobb, California · 16466 days ago · 1 km deep · 37 km away
  39. 1.99 km WSW of Cobb, California · 16466 days ago · 2 km deep · 40 km away
  40. 1.723 km NE of Potter Valley, California · 16465 days ago · 10 km deep · 99 km away
  41. 1.87 km W of Cobb, California · 16464 days ago · 2 km deep · 39 km away
  42. 1.71 km NW of Larkfield-Wikiup, California · 16464 days ago · 1 km deep · 37 km away
  43. 1.89 km NW of Cobb, California · 16464 days ago · 2 km deep · 42 km away
  44. 1.719 km ENE of Potter Valley, California · 16461 days ago · 11 km deep · 91 km away
  45. 1.57 km SW of Clear Lake Riviera, California · 16459 days ago · 2 km deep · 40 km away
  46. 1.85 km NNW of Redwood Valley, California · 16459 days ago · 8 km deep · 100 km away
  47. 1.67 km NE of Hopland, California · 16459 days ago · 2 km deep · 69 km away
  48. 2.37 km WSW of Cobb, California · 16459 days ago · 2 km deep · 38 km away
  49. 1.79 km WSW of Cobb, California · 16456 days ago · 1 km deep · 39 km away
  50. 1.75 km SW of Cobb, California · 16456 days ago · 1 km deep · 35 km away
  51. 1.71 km WNW of Redwood Valley, California · 16456 days ago · 6 km deep · 96 km away
  52. 1.65 km SSW of Clear Lake Riviera, California · 16453 days ago · 1 km deep · 38 km away
  53. 1.96 km WSW of Cobb, California · 16453 days ago · 3 km deep · 37 km away
  54. 2.06 km WSW of Cobb, California · 16452 days ago · 1 km deep · 37 km away
  55. 1.66 km WSW of Cobb, California · 16451 days ago · 0 km deep · 37 km away
  56. 1.67 km WSW of Cobb, California · 16450 days ago · 2 km deep · 38 km away
  57. 2.16 km W of Cobb, California · 16449 days ago · 4 km deep · 37 km away
  58. 1.75 km W of Cobb, California · 16447 days ago · 4 km deep · 37 km away
  59. 1.5Northern California · 16447 days ago · 1 km deep · 40 km away
  60. 1.84 km S of Cobb, California · 16445 days ago · 2 km deep · 30 km away

The first 60 of 108.

Before

  1. 1.79 km WSW of Cobb, California · 16486 days ago · 2 km deep · 39 km away
  2. 2.07 km WSW of Cobb, California · 16486 days ago · 0 km deep · 38 km away
  3. 1.96 km SSW of Green Valley, California · 16486 days ago · 8 km deep · 58 km away
  4. 1.66 km W of Cobb, California · 16490 days ago · 3 km deep · 38 km away
  5. 1.66 km W of Cobb, California · 16490 days ago · 3 km deep · 38 km away
  6. 1.55 km SW of Cobb, California · 16491 days ago · -1 km deep · 34 km away
  7. 2.65 km SW of Cobb, California · 16491 days ago · 1 km deep · 35 km away
  8. 1.95 km SW of Cobb, California · 16491 days ago · 0 km deep · 35 km away
  9. 2.33 km SSW of Antioch, California · 16491 days ago · 15 km deep · 94 km away
  10. 1.86 km W of Cobb, California · 16492 days ago · 0 km deep · 38 km away
  11. 2.522 km NE of Potter Valley, California · 16492 days ago · 12 km deep · 98 km away
  12. 1.59 km WSW of Cobb, California · 16492 days ago · 2 km deep · 39 km away
  13. 1.54 km SSE of Potter Valley, California · 16492 days ago · 10 km deep · 90 km away
  14. 2.22 km ENE of Windsor, California · 16493 days ago · 1 km deep · 37 km away
  15. 1.76 km WSW of Cobb, California · 16493 days ago · 3 km deep · 37 km away
  16. 1.56 km WSW of Cobb, California · 16494 days ago · 0 km deep · 36 km away
  17. 2.45 km WSW of Cobb, California · 16494 days ago · 1 km deep · 36 km away
  18. 1.86 km WSW of Cobb, California · 16494 days ago · 0 km deep · 36 km away
  19. 3.06 km WSW of Cobb, California · 16494 days ago · 4 km deep · 37 km away
  20. 1.96 km WSW of Cobb, California · 16494 days ago · 3 km deep · 37 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1066475. Read Thu, Sep 24, 2026, 5:23 AM UTC.