California earthquakes

M1.9 earthquake 13 km NNE of Angwin, California

A magnitude 1.9 earthquake struck 13 km NNE of Angwin, California on Fri, Feb 27, 1981, 10:15 AM PST (18:15 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M2.0 7 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
1.9 (md), micro
Local time
UTC
1981-02-27 18:15:44 UTC
Depth
10.2 km (6.4 mi), shallow
Epicenter
38.690° N, 122.388° 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, 1.3 km in depth
Magnitude uncertainty
±0.17
Depth from
From location
Station coverage gap
119°
Stations used
15

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 102 in the 60 days after this one and 45 in the 30 days before it.

After

  1. 1.67 km WSW of Cobb, California · 16643 days ago · 1 km deep · 38 km away
  2. 2.07 km W of Cobb, California · 16643 days ago · 0 km deep · 39 km away
  3. 1.61 km NNW of Pleasant Hill, California · 16642 days ago · 8 km deep · 86 km away
  4. 2.28 km WSW of Cobb, California · 16641 days ago · 0 km deep · 39 km away
  5. 1.87 km WSW of Cobb, California · 16641 days ago · 1 km deep · 38 km away
  6. 1.95 km WSW of Cobb, California · 16640 days ago · -1 km deep · 37 km away
  7. 1.82 km SW of Moskowite Corner, California · 16640 days ago · 8 km deep · 33 km away
  8. 1.76 km W of Cobb, California · 16640 days ago · 3 km deep · 38 km away
  9. 1.96 km N of Cloverdale, California · 16640 days ago · 5 km deep · 57 km away
  10. 2.18 km NE of Hidden Valley Lake, California · 16639 days ago · 8 km deep · 20 km away
  11. 1.76 km WSW of Cobb, California · 16639 days ago · 0 km deep · 38 km away
  12. 1.77 km NE of Hidden Valley Lake, California · 16639 days ago · 7 km deep · 20 km away
  13. 2.64 km WSW of Cobb, California · 16639 days ago · 2 km deep · 35 km away
  14. 1.54 km WSW of Cobb, California · 16639 days ago · 4 km deep · 36 km away
  15. 1.65 km SW of Cobb, California · 16638 days ago · 0 km deep · 35 km away
  16. 1.62 km ENE of Pacheco, California · 16637 days ago · 15 km deep · 83 km away
  17. 2.1Northern California · 16637 days ago · -1 km deep · 40 km away
  18. 1.93 km NNW of Redwood Valley, California · 16637 days ago · 6 km deep · 99 km away
  19. 1.86 km W of Cobb, California · 16636 days ago · 2 km deep · 38 km away
  20. 1.63 km W of Clearlake, California · 16636 days ago · 4 km deep · 38 km away
  21. 1.63 km W of Clearlake, California · 16636 days ago · 0 km deep · 38 km away
  22. 2.67 km WSW of Cobb, California · 16636 days ago · 1 km deep · 38 km away
  23. 2.03 km W of Clearlake, California · 16635 days ago · 0 km deep · 38 km away
  24. 1.73 km W of Clearlake, California · 16635 days ago · 2 km deep · 38 km away
  25. 1.53 km WNW of Clearlake, California · 16635 days ago · 2 km deep · 39 km away
  26. 1.53 km E of Clear Lake Riviera, California · 16635 days ago · 1 km deep · 39 km away
  27. 1.67 km W of Cobb, California · 16634 days ago · 2 km deep · 39 km away
  28. 2.19 km WSW of Cobb, California · 16633 days ago · 1 km deep · 40 km away
  29. 2.15 km SW of Cobb, California · 16633 days ago · 0 km deep · 35 km away
  30. 1.82 km SSW of Pittsburg, California · 16632 days ago · 18 km deep · 87 km away
  31. 1.95 km SW of Cobb, California · 16631 days ago · 0 km deep · 35 km away
  32. 1.88 km WSW of Cobb, CA · 16630 days ago · 2 km deep · 39 km away
  33. 1.76 km WSW of Cobb, California · 16628 days ago · 0 km deep · 38 km away
  34. 1.73 km N of Piedmont, California · 16628 days ago · 11 km deep · 94 km away
  35. 2.74 km NW of Lincoln, California · 16626 days ago · 10 km deep · 95 km away
  36. 3.04 km NW of Lincoln, California · 16626 days ago · 9 km deep · 95 km away
  37. 2.07 km WSW of Cobb, California · 16626 days ago · 1 km deep · 38 km away
  38. 1.86 km W of Cobb, California · 16626 days ago · 4 km deep · 38 km away
  39. 1.65 km SW of Cobb, California · 16626 days ago · 1 km deep · 36 km away
  40. 2.29 km ENE of Hidden Valley Lake, California · 16624 days ago · 8 km deep · 17 km away
  41. 1.610 km E of Hidden Valley Lake, California · 16624 days ago · 7 km deep · 15 km away
  42. 1.96 km W of Cobb, California · 16624 days ago · 3 km deep · 38 km away
  43. 2.08 km W of Cobb, California · 16622 days ago · 1 km deep · 41 km away
  44. 1.88 km W of Cobb, California · 16622 days ago · 1 km deep · 41 km away
  45. 1.59 km W of Cobb, California · 16622 days ago · 1 km deep · 40 km away
  46. 1.79 km WSW of Cobb, California · 16620 days ago · 1 km deep · 40 km away
  47. 2.69 km E of Hidden Valley Lake, California · 16620 days ago · 11 km deep · 13 km away
  48. 2.27 km WSW of Cobb, California · 16619 days ago · 2 km deep · 38 km away
  49. 1.85 km WSW of Cobb, California · 16619 days ago · 0 km deep · 36 km away
  50. 1.77 km WSW of Cobb, California · 16619 days ago · 0 km deep · 39 km away
  51. 1.76 km WSW of Cobb, California · 16618 days ago · 1 km deep · 38 km away
  52. 2.711 km N of Princeton, California · 16618 days ago · 19 km deep · 97 km away
  53. 2.06 km ESE of Roseland, California · 16617 days ago · 8 km deep · 40 km away
  54. 1.76 km WSW of Cobb, California · 16617 days ago · 3 km deep · 38 km away
  55. 2.09 km WSW of Cobb, California · 16617 days ago · 2 km deep · 40 km away
  56. 1.77 km W of Cobb, California · 16617 days ago · 1 km deep · 40 km away
  57. 1.68 km W of Cobb, California · 16616 days ago · 0 km deep · 41 km away
  58. 1.614 km E of Potter Valley, California · 16614 days ago · 6 km deep · 86 km away
  59. 1.63 km NE of Clear Lake Riviera, California · 16612 days ago · -1 km deep · 41 km away
  60. 2.18 km ENE of Hidden Valley Lake, California · 16612 days ago · 7 km deep · 16 km away

The first 60 of 102.

Before

  1. 1.57 km WSW of Cobb, California · 16643 days ago · 1 km deep · 38 km away
  2. 2.97 km WSW of Cobb, California · 16643 days ago · 1 km deep · 38 km away
  3. 1.69 km WSW of Cobb, California · 16644 days ago · 1 km deep · 40 km away
  4. 1.510 km W of Cobb, California · 16644 days ago · 1 km deep · 42 km away
  5. 1.57 km WSW of Cobb, California · 16647 days ago · 1 km deep · 39 km away
  6. 1.55 km WSW of Cobb, California · 16647 days ago · -1 km deep · 36 km away
  7. 2.65 km WSW of Cobb, CA · 16647 days ago · 2 km deep · 35 km away
  8. 1.99 km WSW of Cobb, California · 16647 days ago · 1 km deep · 40 km away
  9. 1.78 km WSW of Cobb, California · 16647 days ago · 0 km deep · 39 km away
  10. 2.85 km W of Cobb, California · 16648 days ago · 2 km deep · 38 km away
  11. 1.50 km N of Pleasant Hill, California · 16649 days ago · 7 km deep · 87 km away
  12. 2.54 km SE of Larkfield-Wikiup, California · 16649 days ago · 6 km deep · 36 km away
  13. 2.24 km WSW of Cobb, California · 16649 days ago · 2 km deep · 35 km away
  14. 2.37 km WSW of Cobb, California · 16650 days ago · 0 km deep · 39 km away
  15. 2.014 km ESE of Hidden Valley Lake, California · 16651 days ago · 6 km deep · 6 km away
  16. 1.85 km SE of Boonville, California · 16653 days ago · 7 km deep · 86 km away
  17. 2.09 km WSW of Cobb, California · 16653 days ago · 1 km deep · 40 km away
  18. 1.69 km WSW of Cobb, California · 16657 days ago · 2 km deep · 40 km away
  19. 1.59 km WSW of Cobb, California · 16657 days ago · 2 km deep · 40 km away
  20. 1.92 km ENE of Clear Lake Riviera, California · 16658 days ago · 3 km deep · 40 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1060820. Read Tue, Sep 22, 2026, 3:49 PM UTC.