California earthquakes

M1.5 earthquake 4 km WSW of Cobb, California

A magnitude 1.5 earthquake struck 4 km WSW of Cobb, California on Fri, May 8, 1981, 3:49 PM PDT (22:49 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M3.5 9 km ESE of Willits, 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
1.5 (md), micro
Local time
UTC
1981-05-08 22:49:20 UTC
Depth
1.7 km (1.1 mi), shallow
Epicenter
38.803° N, 122.771° 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, 0.5 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
78°
Stations used
11

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 127 in the 60 days after this one and 58 in the 30 days before it.

After

  1. 2.66 km WSW of Cobb, California · 16579 days ago · 1 km deep · 2 km away
  2. 2.57 km SW of Calistoga, California · 16578 days ago · 6 km deep · 32 km away
  3. 1.65 km NNE of Clearlake, California · 16578 days ago · 1 km deep · 27 km away
  4. 1.78 km ESE of Willits, California · 16577 days ago · 1 km deep · 77 km away
  5. 1.817 km NNE of Upper Lake, California · 16577 days ago · 13 km deep · 57 km away
  6. 1.913 km WSW of Maxwell, California · 16577 days ago · -1 km deep · 60 km away
  7. 1.714 km NNE of Clearlake Oaks, California · 16576 days ago · 8 km deep · 41 km away
  8. 3.06 km WSW of Lower Lake, California · 16576 days ago · 5 km deep · 13 km away
  9. 2.018 km NE of Upper Lake, California · 16576 days ago · 7 km deep · 55 km away
  10. 1.61 km SE of Clearlake, California · 16576 days ago · 11 km deep · 21 km away
  11. 1.612 km SE of Hidden Valley Lake, California · 16576 days ago · 8 km deep · 29 km away
  12. 2.36 km W of Cobb, California · 16576 days ago · 3 km deep · 3 km away
  13. 1.62 km NE of Potter Valley, California · 16576 days ago · 4 km deep · 65 km away
  14. 1.77 km N of Hopland, California · 16576 days ago · 6 km deep · 39 km away
  15. 1.75 km WSW of Lower Lake, California · 16575 days ago · 4 km deep · 13 km away
  16. 1.916 km WSW of Williams, California · 16575 days ago · 2 km deep · 51 km away
  17. 2.16 km NE of Hidden Valley Lake, California · 16574 days ago · 57 km deep · 24 km away
  18. 2.011 km E of Geyserville, California · 16574 days ago · 6 km deep · 11 km away
  19. 1.86 km ENE of Brooktrails, California · 16573 days ago · 7 km deep · 88 km away
  20. 2.314 km S of Guinda, California · 16573 days ago · 4 km deep · 49 km away
  21. 2.313 km WSW of Esparto, California · 16573 days ago · 4 km deep · 55 km away
  22. 1.714 km SW of Guinda, California · 16573 days ago · 5 km deep · 41 km away
  23. 2.04 km WSW of Cobb, California · 16571 days ago · 2 km deep · 0 km away
  24. 2.37 km WSW of Cobb, California · 16569 days ago · 4 km deep · 3 km away
  25. 1.63 km ENE of Clear Lake Riviera, California · 16568 days ago · 3 km deep · 19 km away
  26. 1.53 km E of Clear Lake Riviera, California · 16568 days ago · -1 km deep · 19 km away
  27. 1.83 km E of Clear Lake Riviera, California · 16568 days ago · 3 km deep · 18 km away
  28. 1.57 km WSW of Cobb, California · 16568 days ago · 2 km deep · 4 km away
  29. 1.64 km WSW of Cobb, California · 16568 days ago · 2 km deep · 0 km away
  30. 2.216 km SSE of Sea Ranch, California · 16568 days ago · 1 km deep · 59 km away
  31. 1.512 km E of Angwin, California · 16568 days ago · 5 km deep · 47 km away
  32. 1.97 km WSW of Cobb, California · 16567 days ago · 2 km deep · 3 km away
  33. 1.86 km W of Cobb, California · 16567 days ago · 2 km deep · 2 km away
  34. 1.76 km WSW of Cobb, California · 16567 days ago · 1 km deep · 2 km away
  35. 1.74 km WSW of Cobb, California · 16566 days ago · 4 km deep · 1 km away
  36. 2.27 km W of Cobb, California · 16566 days ago · 3 km deep · 4 km away
  37. 1.76 km W of Cobb, California · 16565 days ago · 1 km deep · 2 km away
  38. 2.021 km ENE of Potter Valley, California · 16564 days ago · 6 km deep · 64 km away
  39. 2.22 km NNE of Upper Lake, California · 16563 days ago · 0 km deep · 43 km away
  40. 1.82 km SE of Clear Lake Riviera, California · 16563 days ago · 4 km deep · 17 km away
  41. 1.55 km WSW of Cobb, California · 16563 days ago · 2 km deep · 1 km away
  42. 2.511 km N of Cloverdale, California · 16563 days ago · 3 km deep · 23 km away
  43. 1.710 km NNE of Cloverdale, California · 16563 days ago · 3 km deep · 21 km away
  44. 1.78 km WSW of Cobb, California · 16560 days ago · 1 km deep · 4 km away
  45. 1.86 km WSW of Cobb, California · 16560 days ago · 3 km deep · 2 km away
  46. 1.69 km E of Hidden Valley Lake, California · 16559 days ago · 7 km deep · 28 km away
  47. 1.95 km WSW of Cobb, California · 16559 days ago · -1 km deep · 1 km away
  48. 2.122 km NE of Potter Valley, California · 16559 days ago · 8 km deep · 75 km away
  49. 1.94 km SSW of Lagunitas-Forest Knolls, California · 16559 days ago · 0 km deep · 92 km away
  50. 2.06 km W of Cobb, California · 16559 days ago · 2 km deep · 4 km away
  51. 2.16 km W of Cobb, California · 16558 days ago · 0 km deep · 3 km away
  52. 1.98 km ENE of Larkfield-Wikiup, California · 16558 days ago · 6 km deep · 32 km away
  53. 2.76 km W of Cobb, California · 16557 days ago · 1 km deep · 3 km away
  54. 2.46 km WSW of Cobb, California · 16557 days ago · 1 km deep · 2 km away
  55. 2.14 km S of Cobb, California · 16557 days ago · 0 km deep · 5 km away
  56. 1.67 km WSW of Cobb, California · 16557 days ago · 1 km deep · 3 km away
  57. 1.69 km WSW of Cobb, California · 16557 days ago · -1 km deep · 5 km away
  58. 1.79 km ENE of Hidden Valley Lake, California · 16556 days ago · 7 km deep · 28 km away
  59. 1.83 km ESE of Clear Lake Riviera, California · 16556 days ago · -1 km deep · 18 km away
  60. 1.58 km NW of Redwood Valley, California · 16556 days ago · 5 km deep · 72 km away

The first 60 of 127.

Before

  1. 2.59 km W of Cobb, California · 16579 days ago · 1 km deep · 6 km away
  2. 3.27 km SW of Artois, California · 16579 days ago · 19 km deep · 96 km away
  3. 1.97 km S of Calistoga, California · 16579 days ago · 8 km deep · 37 km away
  4. 1.59 km N of Cloverdale, California · 16580 days ago · 2 km deep · 23 km away
  5. 1.63 km ESE of Calpella, California · 16581 days ago · 3 km deep · 58 km away
  6. 1.925 km SE of Covelo, California · 16581 days ago · 5 km deep · 93 km away
  7. 1.78 km WSW of Cobb, California · 16581 days ago · 4 km deep · 4 km away
  8. 1.611 km W of Cobb, California · 16582 days ago · -1 km deep · 8 km away
  9. 2.18 km W of Cobb, California · 16582 days ago · 0 km deep · 5 km away
  10. 1.88 km W of Cobb, California · 16582 days ago · 1 km deep · 4 km away
  11. 1.69 km NE of Cloverdale, California · 16583 days ago · 3 km deep · 18 km away
  12. 1.94 km WSW of Cobb, California · 16583 days ago · 1 km deep · 0 km away
  13. 2.26 km WSW of Cobb, California · 16583 days ago · -1 km deep · 2 km away
  14. 1.917 km ENE of Willits, California · 16585 days ago · 6 km deep · 85 km away
  15. 1.89 km WSW of Cobb, California · 16585 days ago · 2 km deep · 5 km away
  16. 1.5near the coast of Northern California · 16586 days ago · 7 km deep · 81 km away
  17. 1.612 km S of Guinda, California · 16586 days ago · 4 km deep · 52 km away
  18. 1.66 km WSW of Cobb, California · 16586 days ago · 0 km deep · 2 km away
  19. 1.910 km ESE of Willits, California · 16586 days ago · 6 km deep · 76 km away
  20. 1.56 km W of Cobb, California · 16587 days ago · 4 km deep · 3 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1063407. Read Mon, Sep 28, 2026, 7:43 PM UTC.