California earthquakes

M1.7 earthquake 20 km ENE of Brooktrails, California

A magnitude 1.7 earthquake struck 20 km ENE of Brooktrails, California on Sun, Feb 22, 1981, 8:09 AM PST (16:09 UTC), 9 km (5 mi) below the surface.

A larger quake followed: M3.0 10 km W of Point Arena, California. This one was a foreshock.

Brooktrails 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
1981-02-22 16:09:17 UTC
Depth
8.6 km (5.4 mi), shallow
Epicenter
39.538° N, 123.178° 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 0.6 km horizontally, 1.0 km in depth
Magnitude uncertainty
±0.17
Depth from
From location
Station coverage gap
126°
Stations used
5

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 119 in the 60 days after this one and 48 in the 30 days before it.

After

  1. 1.78 km WSW of Cobb, California · 16654 days ago · 0 km deep · 88 km away
  2. 1.99 km WSW of Cobb, California · 16654 days ago · 1 km deep · 87 km away
  3. 2.65 km WSW of Cobb, CA · 16654 days ago · 2 km deep · 89 km away
  4. 1.55 km WSW of Cobb, California · 16654 days ago · -1 km deep · 89 km away
  5. 1.57 km WSW of Cobb, California · 16654 days ago · 1 km deep · 87 km away
  6. 2.326 km W of Paskenta, California · 16653 days ago · -1 km deep · 48 km away
  7. 1.54 km N of Laytonville, California · 16652 days ago · 11 km deep · 34 km away
  8. 1.510 km W of Cobb, California · 16651 days ago · 1 km deep · 85 km away
  9. 1.69 km WSW of Cobb, California · 16650 days ago · 1 km deep · 88 km away
  10. 2.97 km WSW of Cobb, California · 16650 days ago · 1 km deep · 88 km away
  11. 1.57 km WSW of Cobb, California · 16650 days ago · 1 km deep · 88 km away
  12. 1.67 km WSW of Cobb, California · 16650 days ago · 1 km deep · 88 km away
  13. 2.07 km W of Cobb, California · 16650 days ago · 0 km deep · 87 km away
  14. 2.28 km WSW of Cobb, California · 16648 days ago · 0 km deep · 88 km away
  15. 1.87 km WSW of Cobb, California · 16648 days ago · 1 km deep · 88 km away
  16. 1.95 km WSW of Cobb, California · 16647 days ago · -1 km deep · 87 km away
  17. 1.76 km W of Cobb, California · 16647 days ago · 3 km deep · 87 km away
  18. 1.96 km N of Cloverdale, California · 16647 days ago · 5 km deep · 76 km away
  19. 2.18 km NE of Hidden Valley Lake, California · 16646 days ago · 8 km deep · 96 km away
  20. 1.76 km WSW of Cobb, California · 16646 days ago · 0 km deep · 88 km away
  21. 1.77 km NE of Hidden Valley Lake, California · 16646 days ago · 7 km deep · 96 km away
  22. 2.64 km WSW of Cobb, California · 16646 days ago · 2 km deep · 89 km away
  23. 1.54 km WSW of Cobb, California · 16646 days ago · 4 km deep · 88 km away
  24. 1.65 km SW of Cobb, California · 16645 days ago · 0 km deep · 90 km away
  25. 2.1Northern California · 16644 days ago · -1 km deep · 88 km away
  26. 1.93 km NNW of Redwood Valley, California · 16644 days ago · 6 km deep · 27 km away
  27. 1.86 km W of Cobb, California · 16643 days ago · 2 km deep · 87 km away
  28. 1.63 km W of Clearlake, California · 16643 days ago · 4 km deep · 78 km away
  29. 1.63 km W of Clearlake, California · 16643 days ago · 0 km deep · 78 km away
  30. 2.67 km WSW of Cobb, California · 16642 days ago · 1 km deep · 88 km away
  31. 2.03 km W of Clearlake, California · 16642 days ago · 0 km deep · 78 km away
  32. 1.73 km W of Clearlake, California · 16642 days ago · 2 km deep · 78 km away
  33. 1.53 km WNW of Clearlake, California · 16642 days ago · 2 km deep · 77 km away
  34. 1.53 km E of Clear Lake Riviera, California · 16642 days ago · 1 km deep · 77 km away
  35. 1.67 km W of Cobb, California · 16641 days ago · 2 km deep · 87 km away
  36. 2.08 km WNW of Laytonville, California · 16641 days ago · 5 km deep · 40 km away
  37. 2.19 km WSW of Cobb, California · 16640 days ago · 1 km deep · 87 km away
  38. 2.15 km SW of Cobb, California · 16640 days ago · 0 km deep · 90 km away
  39. 1.99 km NW of Redwood Valley, CA · 16639 days ago · 5 km deep · 25 km away
  40. 2.49 km NW of Redwood Valley, California · 16639 days ago · 4 km deep · 25 km away
  41. 1.79 km NW of Redwood Valley, California · 16639 days ago · 5 km deep · 25 km away
  42. 1.69 km NW of Redwood Valley, California · 16639 days ago · 4 km deep · 25 km away
  43. 1.95 km SW of Cobb, California · 16638 days ago · 0 km deep · 90 km away
  44. 1.88 km WSW of Cobb, CA · 16637 days ago · 2 km deep · 88 km away
  45. 2.05 km ENE of Willits, CA · 16637 days ago · 2 km deep · 16 km away
  46. 1.76 km WSW of Cobb, California · 16635 days ago · 0 km deep · 88 km away
  47. 2.07 km WSW of Cobb, California · 16633 days ago · 1 km deep · 87 km away
  48. 1.75 km SSW of Laytonville, California · 16633 days ago · -1 km deep · 30 km away
  49. 1.86 km W of Cobb, California · 16633 days ago · 4 km deep · 87 km away
  50. 1.65 km SW of Cobb, California · 16633 days ago · 1 km deep · 90 km away
  51. 2.37 km SSW of Hamilton City, California · 16633 days ago · 18 km deep · 99 km away
  52. 1.710 km NNW of Potter Valley, California · 16632 days ago · 7 km deep · 14 km away
  53. 2.29 km ENE of Hidden Valley Lake, California · 16631 days ago · 8 km deep · 100 km away
  54. 1.98 km SW of Laytonville, California · 16631 days ago · 8 km deep · 35 km away
  55. 1.96 km W of Cobb, California · 16631 days ago · 3 km deep · 87 km away
  56. 2.08 km W of Cobb, California · 16629 days ago · 1 km deep · 84 km away
  57. 1.88 km W of Cobb, California · 16629 days ago · 1 km deep · 85 km away
  58. 1.59 km W of Cobb, California · 16629 days ago · 1 km deep · 87 km away
  59. 1.79 km WSW of Cobb, California · 16627 days ago · 1 km deep · 87 km away
  60. 2.27 km WSW of Cobb, California · 16626 days ago · 2 km deep · 88 km away

The first 60 of 119.

Before

  1. 2.85 km W of Cobb, California · 16655 days ago · 2 km deep · 86 km away
  2. 2.24 km WSW of Cobb, California · 16656 days ago · 2 km deep · 89 km away
  3. 2.37 km WSW of Cobb, California · 16657 days ago · 0 km deep · 87 km away
  4. 1.85 km SE of Boonville, California · 16660 days ago · 7 km deep · 64 km away
  5. 2.09 km WSW of Cobb, California · 16660 days ago · 1 km deep · 87 km away
  6. 2.310 km SSE of Laytonville, California · 16661 days ago · 4 km deep · 25 km away
  7. 2.522 km WSW of Elk Creek, California · 16662 days ago · 6 km deep · 33 km away
  8. 2.18 km SE of Orland, California · 16663 days ago · 26 km deep · 92 km away
  9. 1.69 km WSW of Cobb, California · 16664 days ago · 2 km deep · 87 km away
  10. 1.59 km WSW of Cobb, California · 16664 days ago · 2 km deep · 87 km away
  11. 1.92 km ENE of Clear Lake Riviera, California · 16665 days ago · 3 km deep · 77 km away
  12. 1.99 km WSW of Cobb, California · 16665 days ago · 2 km deep · 87 km away
  13. 2.310 km W of Cobb, California · 16666 days ago · 1 km deep · 85 km away
  14. 2.18 km W of Cobb, California · 16667 days ago · -1 km deep · 86 km away
  15. 2.123 km WSW of Elk Creek, California · 16667 days ago · 7 km deep · 32 km away
  16. 1.67 km E of Willits, California · 16667 days ago · 7 km deep · 16 km away
  17. 1.65 km W of Cobb, California · 16667 days ago · 1 km deep · 86 km away
  18. 2.56 km WSW of Cobb, California · 16669 days ago · 3 km deep · 87 km away
  19. 2.44 km WSW of Cobb, California · 16669 days ago · 1 km deep · 89 km away
  20. 1.64 km WSW of Cobb, California · 16669 days ago · 1 km deep · 89 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1060649. Read Tue, Sep 29, 2026, 3:18 PM UTC.