California earthquakes

M1.8 earthquake 7 km W of Cobb, California

A magnitude 1.8 earthquake struck 7 km W of Cobb, California on Tue, Apr 21, 1981, 12:11 PM PST (20:11 UTC), 1 km (0 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
1.8 (md), micro
Local time
UTC
1981-04-21 20:11:22 UTC
Depth
0.5 km (0.3 mi), shallow
Epicenter
38.829° N, 122.810° 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, 0.4 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
43°
Stations used
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 121 in the 60 days after this one and 52 in the 30 days before it.

After

  1. 1.611 km NE of Healdsburg, California · 16596 days ago · 5 km deep · 18 km away
  2. 1.86 km W of Cobb, California · 16595 days ago · 2 km deep · 2 km away
  3. 2.34 km WSW of Cobb, California · 16595 days ago · 2 km deep · 5 km away
  4. 1.64 km WSW of Cobb, California · 16595 days ago · 2 km deep · 5 km away
  5. 1.76 km W of Cobb, California · 16594 days ago · 4 km deep · 1 km away
  6. 1.79 km WSW of Cobb, California · 16592 days ago · 2 km deep · 4 km away
  7. 2.16 km WSW of Cobb, California · 16592 days ago · 1 km deep · 4 km away
  8. 1.86 km WSW of Cobb, California · 16592 days ago · 1 km deep · 4 km away
  9. 2.18 km E of Hidden Valley Lake, California · 16592 days ago · 7 km deep · 30 km away
  10. 1.66 km WSW of Cobb, California · 16589 days ago · 0 km deep · 4 km away
  11. 2.95 km SW of Cobb, California · 16589 days ago · 0 km deep · 5 km away
  12. 1.85 km SW of Cobb, California · 16589 days ago · 0 km deep · 5 km away
  13. 1.56 km W of Cobb, California · 16588 days ago · 4 km deep · 2 km away
  14. 1.910 km ESE of Willits, California · 16587 days ago · 6 km deep · 71 km away
  15. 1.66 km WSW of Cobb, California · 16587 days ago · 0 km deep · 3 km away
  16. 1.612 km S of Guinda, California · 16587 days ago · 4 km deep · 56 km away
  17. 1.5near the coast of Northern California · 16587 days ago · 7 km deep · 77 km away
  18. 1.89 km WSW of Cobb, California · 16586 days ago · 2 km deep · 3 km away
  19. 1.917 km ENE of Willits, California · 16586 days ago · 6 km deep · 81 km away
  20. 2.26 km WSW of Cobb, California · 16584 days ago · -1 km deep · 3 km away
  21. 1.94 km WSW of Cobb, California · 16584 days ago · 1 km deep · 5 km away
  22. 1.69 km NE of Cloverdale, California · 16584 days ago · 3 km deep · 13 km away
  23. 1.88 km W of Cobb, California · 16583 days ago · 1 km deep · 1 km away
  24. 2.18 km W of Cobb, California · 16583 days ago · 0 km deep · 1 km away
  25. 1.611 km W of Cobb, California · 16583 days ago · -1 km deep · 4 km away
  26. 1.78 km WSW of Cobb, California · 16582 days ago · 4 km deep · 4 km away
  27. 1.925 km SE of Covelo, California · 16582 days ago · 5 km deep · 90 km away
  28. 1.63 km ESE of Calpella, California · 16582 days ago · 3 km deep · 54 km away
  29. 1.59 km N of Cloverdale, California · 16581 days ago · 2 km deep · 19 km away
  30. 1.97 km S of Calistoga, California · 16580 days ago · 8 km deep · 41 km away
  31. 3.27 km SW of Artois, California · 16580 days ago · 19 km deep · 95 km away
  32. 2.59 km W of Cobb, California · 16580 days ago · 1 km deep · 3 km away
  33. 1.54 km WSW of Cobb, California · 16580 days ago · 2 km deep · 4 km away
  34. 2.66 km WSW of Cobb, California · 16580 days ago · 1 km deep · 4 km away
  35. 2.57 km SW of Calistoga, California · 16579 days ago · 6 km deep · 36 km away
  36. 1.65 km NNE of Clearlake, California · 16579 days ago · 1 km deep · 27 km away
  37. 1.78 km ESE of Willits, California · 16579 days ago · 1 km deep · 72 km away
  38. 1.817 km NNE of Upper Lake, California · 16578 days ago · 13 km deep · 54 km away
  39. 1.913 km WSW of Maxwell, California · 16578 days ago · -1 km deep · 60 km away
  40. 1.714 km NNE of Clearlake Oaks, California · 16578 days ago · 8 km deep · 39 km away
  41. 3.06 km WSW of Lower Lake, California · 16578 days ago · 5 km deep · 13 km away
  42. 2.018 km NE of Upper Lake, California · 16577 days ago · 7 km deep · 52 km away
  43. 1.61 km SE of Clearlake, California · 16577 days ago · 11 km deep · 21 km away
  44. 1.612 km SE of Hidden Valley Lake, California · 16577 days ago · 8 km deep · 33 km away
  45. 2.36 km W of Cobb, California · 16577 days ago · 3 km deep · 1 km away
  46. 1.62 km NE of Potter Valley, California · 16577 days ago · 4 km deep · 61 km away
  47. 1.77 km N of Hopland, California · 16577 days ago · 6 km deep · 35 km away
  48. 1.75 km WSW of Lower Lake, California · 16576 days ago · 4 km deep · 14 km away
  49. 1.916 km WSW of Williams, California · 16576 days ago · 2 km deep · 52 km away
  50. 2.16 km NE of Hidden Valley Lake, California · 16575 days ago · 57 km deep · 27 km away
  51. 2.011 km E of Geyserville, California · 16575 days ago · 6 km deep · 14 km away
  52. 1.86 km ENE of Brooktrails, California · 16575 days ago · 7 km deep · 83 km away
  53. 2.314 km S of Guinda, California · 16574 days ago · 4 km deep · 53 km away
  54. 2.313 km WSW of Esparto, California · 16574 days ago · 4 km deep · 59 km away
  55. 1.714 km SW of Guinda, California · 16574 days ago · 5 km deep · 45 km away
  56. 2.04 km WSW of Cobb, California · 16572 days ago · 2 km deep · 5 km away
  57. 2.37 km WSW of Cobb, California · 16570 days ago · 4 km deep · 4 km away
  58. 1.63 km ENE of Clear Lake Riviera, California · 16570 days ago · 3 km deep · 18 km away
  59. 1.53 km E of Clear Lake Riviera, California · 16570 days ago · -1 km deep · 18 km away
  60. 1.83 km E of Clear Lake Riviera, California · 16570 days ago · 3 km deep · 18 km away

The first 60 of 121.

Before

  1. 1.84 km E of Clear Lake Riviera, California · 16599 days ago · 0 km deep · 18 km away
  2. 2.96 km W of Cobb, California · 16599 days ago · 3 km deep · 2 km away
  3. 1.715 km W of Calpella, California · 16600 days ago · 4 km deep · 67 km away
  4. 1.82 km NE of Ukiah, California · 16600 days ago · 8 km deep · 50 km away
  5. 2.61 km NNW of Ukiah, California · 16601 days ago · 4 km deep · 51 km away
  6. 2.33 km ESE of Talmage, California · 16601 days ago · 5 km deep · 43 km away
  7. 2.028 km NNE of Potter Valley, California · 16601 days ago · 14 km deep · 81 km away
  8. 2.821 km NNE of Potter Valley, California · 16603 days ago · 8 km deep · 75 km away
  9. 1.69 km WSW of Cobb, California · 16603 days ago · 2 km deep · 4 km away
  10. 1.821 km NNE of Potter Valley, California · 16603 days ago · 8 km deep · 75 km away
  11. 2.29 km WSW of Cobb, California · 16604 days ago · 2 km deep · 3 km away
  12. 2.27 km WSW of Cobb, California · 16604 days ago · 1 km deep · 3 km away
  13. 2.36 km WSW of Cobb, California · 16604 days ago · 1 km deep · 2 km away
  14. 2.120 km ENE of Brooktrails, California · 16604 days ago · 8 km deep · 84 km away
  15. 1.89 km NE of Brooktrails, California · 16605 days ago · 8 km deep · 85 km away
  16. 1.9near the coast of Northern California · 16605 days ago · 10 km deep · 85 km away
  17. 1.60 km W of Moskowite Corner, California · 16606 days ago · 16 km deep · 68 km away
  18. 2.417 km NE of Nice, California · 16607 days ago · 8 km deep · 47 km away
  19. 1.76 km WSW of Cobb, California · 16607 days ago · 3 km deep · 3 km away
  20. 1.96 km W of Cobb, California · 16608 days ago · 4 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1062848. Read Tue, Sep 29, 2026, 9:56 PM UTC.