California earthquakes

M1.8 earthquake 7 km WSW of Cobb, California

A magnitude 1.8 earthquake struck 7 km WSW of Cobb, California on Sun, Mar 1, 1981, 6:40 PM PST (02:40 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M1.9 5 km WSW of Cobb, 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
1.8 (md), micro
Local time
UTC
1981-03-02 02:40:21 UTC
Depth
1.2 km (0.8 mi), shallow
Epicenter
38.804° N, 122.807° 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, 0.3 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
78°
Stations used
19

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 48 in the 30 days before it.

After

  1. 1.95 km WSW of Cobb, California · 16641 days ago · -1 km deep · 2 km away
  2. 1.82 km SW of Moskowite Corner, California · 16640 days ago · 8 km deep · 66 km away
  3. 1.76 km W of Cobb, California · 16640 days ago · 3 km deep · 1 km away
  4. 1.96 km N of Cloverdale, California · 16640 days ago · 5 km deep · 18 km away
  5. 2.18 km NE of Hidden Valley Lake, California · 16640 days ago · 8 km deep · 29 km away
  6. 1.76 km WSW of Cobb, California · 16640 days ago · 0 km deep · 1 km away
  7. 1.77 km NE of Hidden Valley Lake, California · 16640 days ago · 7 km deep · 28 km away
  8. 2.64 km WSW of Cobb, California · 16639 days ago · 2 km deep · 4 km away
  9. 1.54 km WSW of Cobb, California · 16639 days ago · 4 km deep · 3 km away
  10. 1.65 km SW of Cobb, California · 16638 days ago · 0 km deep · 3 km away
  11. 2.1Northern California · 16637 days ago · -1 km deep · 1 km away
  12. 1.93 km NNW of Redwood Valley, California · 16637 days ago · 6 km deep · 66 km away
  13. 1.86 km W of Cobb, California · 16636 days ago · 2 km deep · 1 km away
  14. 1.63 km W of Clearlake, California · 16636 days ago · 4 km deep · 21 km away
  15. 1.63 km W of Clearlake, California · 16636 days ago · 0 km deep · 21 km away
  16. 2.67 km WSW of Cobb, California · 16636 days ago · 1 km deep · 0 km away
  17. 2.03 km W of Clearlake, California · 16636 days ago · 0 km deep · 21 km away
  18. 1.73 km W of Clearlake, California · 16636 days ago · 2 km deep · 21 km away
  19. 1.53 km WNW of Clearlake, California · 16636 days ago · 2 km deep · 23 km away
  20. 1.53 km E of Clear Lake Riviera, California · 16636 days ago · 1 km deep · 20 km away
  21. 1.67 km W of Cobb, California · 16634 days ago · 2 km deep · 1 km away
  22. 2.19 km WSW of Cobb, California · 16633 days ago · 1 km deep · 2 km away
  23. 2.15 km SW of Cobb, California · 16633 days ago · 0 km deep · 3 km away
  24. 1.99 km NW of Redwood Valley, CA · 16632 days ago · 5 km deep · 71 km away
  25. 2.49 km NW of Redwood Valley, California · 16632 days ago · 4 km deep · 71 km away
  26. 1.79 km NW of Redwood Valley, California · 16632 days ago · 5 km deep · 71 km away
  27. 1.69 km NW of Redwood Valley, California · 16632 days ago · 4 km deep · 71 km away
  28. 1.95 km SW of Cobb, California · 16632 days ago · 0 km deep · 3 km away
  29. 1.88 km WSW of Cobb, CA · 16631 days ago · 2 km deep · 0 km away
  30. 2.05 km ENE of Willits, CA · 16630 days ago · 2 km deep · 82 km away
  31. 1.76 km WSW of Cobb, California · 16628 days ago · 0 km deep · 1 km away
  32. 2.07 km WSW of Cobb, California · 16626 days ago · 1 km deep · 0 km away
  33. 1.86 km W of Cobb, California · 16626 days ago · 4 km deep · 2 km away
  34. 1.65 km SW of Cobb, California · 16626 days ago · 1 km deep · 3 km away
  35. 1.710 km NNW of Potter Valley, California · 16625 days ago · 7 km deep · 74 km away
  36. 2.29 km ENE of Hidden Valley Lake, California · 16624 days ago · 8 km deep · 30 km away
  37. 1.610 km E of Hidden Valley Lake, California · 16624 days ago · 7 km deep · 32 km away
  38. 1.96 km W of Cobb, California · 16624 days ago · 3 km deep · 2 km away
  39. 2.08 km W of Cobb, California · 16623 days ago · 1 km deep · 3 km away
  40. 1.88 km W of Cobb, California · 16622 days ago · 1 km deep · 3 km away
  41. 1.59 km W of Cobb, California · 16622 days ago · 1 km deep · 2 km away
  42. 1.79 km WSW of Cobb, California · 16621 days ago · 1 km deep · 2 km away
  43. 2.69 km E of Hidden Valley Lake, California · 16620 days ago · 11 km deep · 31 km away
  44. 2.27 km WSW of Cobb, California · 16619 days ago · 2 km deep · 0 km away
  45. 1.85 km WSW of Cobb, California · 16619 days ago · 0 km deep · 2 km away
  46. 1.77 km WSW of Cobb, California · 16619 days ago · 0 km deep · 0 km away
  47. 1.76 km WSW of Cobb, California · 16619 days ago · 1 km deep · 1 km away
  48. 2.06 km ESE of Roseland, California · 16618 days ago · 8 km deep · 47 km away
  49. 1.76 km WSW of Cobb, California · 16618 days ago · 3 km deep · 1 km away
  50. 2.09 km WSW of Cobb, California · 16617 days ago · 2 km deep · 2 km away
  51. 1.77 km W of Cobb, California · 16617 days ago · 1 km deep · 2 km away
  52. 1.68 km W of Cobb, California · 16617 days ago · 0 km deep · 3 km away
  53. 1.614 km E of Potter Valley, California · 16614 days ago · 6 km deep · 60 km away
  54. 1.63 km NE of Clear Lake Riviera, California · 16613 days ago · -1 km deep · 22 km away
  55. 2.18 km ENE of Hidden Valley Lake, California · 16612 days ago · 7 km deep · 30 km away
  56. 1.62 km NE of Clear Lake Riviera, California · 16612 days ago · 4 km deep · 21 km away
  57. 1.76 km W of Cobb, California · 16612 days ago · 2 km deep · 1 km away
  58. 2.38 km ENE of Hidden Valley Lake, California · 16612 days ago · 8 km deep · 30 km away
  59. 1.77 km WSW of Cobb, California · 16611 days ago · 2 km deep · 0 km away
  60. 3.010 km W of Point Arena, California · 16611 days ago · 7 km deep · 88 km away

The first 60 of 108.

Before

  1. 2.28 km WSW of Cobb, California · 16641 days ago · 0 km deep · 1 km away
  2. 2.07 km W of Cobb, California · 16643 days ago · 0 km deep · 1 km away
  3. 1.67 km WSW of Cobb, California · 16643 days ago · 1 km deep · 0 km away
  4. 1.913 km NNE of Angwin, California · 16643 days ago · 10 km deep · 38 km away
  5. 1.57 km WSW of Cobb, California · 16644 days ago · 1 km deep · 0 km away
  6. 2.97 km WSW of Cobb, California · 16644 days ago · 1 km deep · 0 km away
  7. 1.69 km WSW of Cobb, California · 16644 days ago · 1 km deep · 2 km away
  8. 1.510 km W of Cobb, California · 16644 days ago · 1 km deep · 3 km away
  9. 1.57 km WSW of Cobb, California · 16647 days ago · 1 km deep · 0 km away
  10. 1.55 km WSW of Cobb, California · 16647 days ago · -1 km deep · 3 km away
  11. 2.65 km WSW of Cobb, CA · 16647 days ago · 2 km deep · 3 km away
  12. 1.99 km WSW of Cobb, California · 16647 days ago · 1 km deep · 2 km away
  13. 1.78 km WSW of Cobb, California · 16647 days ago · 0 km deep · 1 km away
  14. 1.720 km ENE of Brooktrails, California · 16648 days ago · 9 km deep · 88 km away
  15. 2.85 km W of Cobb, California · 16649 days ago · 2 km deep · 3 km away
  16. 2.54 km SE of Larkfield-Wikiup, California · 16650 days ago · 6 km deep · 36 km away
  17. 2.24 km WSW of Cobb, California · 16650 days ago · 2 km deep · 3 km away
  18. 2.37 km WSW of Cobb, California · 16651 days ago · 0 km deep · 1 km away
  19. 2.014 km ESE of Hidden Valley Lake, California · 16651 days ago · 6 km deep · 35 km away
  20. 1.85 km SE of Boonville, California · 16653 days ago · 7 km deep · 48 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1060893. Read Tue, Sep 22, 2026, 11:31 PM UTC.