California earthquakes

M1.8 earthquake 18 km NE of Potter Valley, California

A magnitude 1.8 earthquake struck 18 km NE of Potter Valley, California on Thu, Jul 9, 1981, 7:54 AM PDT (14:54 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M2.2 9 km WSW of Cobb, California. This one was a foreshock.

Potter Valley 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
1981-07-09 14:54:55 UTC
Depth
6.7 km (4.2 mi), shallow
Epicenter
39.437° N, 122.963° 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, 1.2 km in depth
Magnitude uncertainty
±0.25
Depth from
From location
Station coverage gap
91°
Stations used
9

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 114 in the 60 days after this one and 60 in the 30 days before it.

After

  1. 2.29 km WSW of Cobb, California · 16511 days ago · 1 km deep · 71 km away
  2. 2.08 km NW of Redwood Valley, California · 16510 days ago · 2 km deep · 28 km away
  3. 1.822 km NE of Potter Valley, California · 16510 days ago · 11 km deep · 4 km away
  4. 1.87 km NNW of Redwood Valley, California · 16509 days ago · 5 km deep · 28 km away
  5. 2.18 km NE of Hidden Valley Lake, California · 16508 days ago · 8 km deep · 76 km away
  6. 1.54 km WSW of Cobb, California · 16508 days ago · 1 km deep · 73 km away
  7. 1.919 km ENE of Potter Valley, California · 16508 days ago · 9 km deep · 8 km away
  8. 1.824 km NE of Potter Valley, California · 16507 days ago · 12 km deep · 7 km away
  9. 1.88 km NW of Redwood Valley, California · 16507 days ago · 3 km deep · 28 km away
  10. 2.122 km WNW of Elk Creek, California · 16507 days ago · 6 km deep · 28 km away
  11. 1.56 km W of Cobb, California · 16507 days ago · 3 km deep · 70 km away
  12. 1.919 km ENE of Potter Valley, California · 16507 days ago · 11 km deep · 8 km away
  13. 1.52 km WSW of Redwood Valley, California · 16506 days ago · 6 km deep · 31 km away
  14. 1.56 km W of Cobb, California · 16505 days ago · 3 km deep · 70 km away
  15. 2.24 km WSW of Cobb, California · 16505 days ago · 1 km deep · 72 km away
  16. 1.99 km WSW of Cobb, California · 16503 days ago · 1 km deep · 71 km away
  17. 2.04 km WSW of Cobb, California · 16501 days ago · 1 km deep · 72 km away
  18. 2.17 km W of Cobb, California · 16501 days ago · 4 km deep · 71 km away
  19. 1.52 km ESE of Nord, California · 16500 days ago · 14 km deep · 96 km away
  20. 1.97 km WSW of Cobb, California · 16499 days ago · 2 km deep · 72 km away
  21. 1.55 km WSW of Cobb, California · 16499 days ago · 4 km deep · 72 km away
  22. 1.96 km W of Cobb, California · 16499 days ago · 3 km deep · 70 km away
  23. 1.76 km W of Cobb, California · 16499 days ago · 3 km deep · 71 km away
  24. 1.56 km W of Cobb, California · 16498 days ago · 2 km deep · 70 km away
  25. 2.04 km ESE of Calpella, California · 16498 days ago · 6 km deep · 30 km away
  26. 1.67 km E of Willits, California · 16498 days ago · 8 km deep · 26 km away
  27. 2.311 km N of Covelo, California · 16497 days ago · 0 km deep · 57 km away
  28. 2.04 km WSW of Cobb, California · 16496 days ago · 2 km deep · 73 km away
  29. 1.69 km WSW of Cobb, California · 16496 days ago · 1 km deep · 72 km away
  30. 2.210 km ESE of Potter Valley, California · 16496 days ago · -1 km deep · 17 km away
  31. 1.87 km WSW of Cobb, California · 16495 days ago · 1 km deep · 72 km away
  32. 1.8Northern California · 16493 days ago · 2 km deep · 71 km away
  33. 1.66 km WSW of Cobb, California · 16493 days ago · 0 km deep · 73 km away
  34. 1.96 km WSW of Cobb, California · 16493 days ago · 3 km deep · 71 km away
  35. 3.06 km WSW of Cobb, California · 16493 days ago · 4 km deep · 71 km away
  36. 1.86 km WSW of Cobb, California · 16492 days ago · 0 km deep · 72 km away
  37. 2.45 km WSW of Cobb, California · 16492 days ago · 1 km deep · 72 km away
  38. 1.56 km WSW of Cobb, California · 16492 days ago · 0 km deep · 72 km away
  39. 2.322 km WNW of Elk Creek, California · 16492 days ago · 7 km deep · 28 km away
  40. 1.76 km WSW of Cobb, California · 16492 days ago · 3 km deep · 71 km away
  41. 2.22 km ENE of Windsor, California · 16491 days ago · 1 km deep · 99 km away
  42. 1.512 km SSW of Laytonville, California · 16491 days ago · 1 km deep · 51 km away
  43. 1.54 km SSE of Potter Valley, California · 16491 days ago · 10 km deep · 20 km away
  44. 1.59 km WSW of Cobb, California · 16491 days ago · 2 km deep · 72 km away
  45. 2.522 km NE of Potter Valley, California · 16490 days ago · 12 km deep · 4 km away
  46. 1.86 km W of Cobb, California · 16490 days ago · 0 km deep · 69 km away
  47. 1.95 km SW of Cobb, California · 16489 days ago · 0 km deep · 74 km away
  48. 2.65 km SW of Cobb, California · 16489 days ago · 1 km deep · 74 km away
  49. 1.55 km SW of Cobb, California · 16489 days ago · -1 km deep · 74 km away
  50. 1.66 km W of Cobb, California · 16489 days ago · 3 km deep · 70 km away
  51. 1.66 km W of Cobb, California · 16489 days ago · 3 km deep · 70 km away
  52. 1.86 km WSW of Durham, California · 16488 days ago · 29 km deep · 96 km away
  53. 1.715 km S of Leggett, California · 16488 days ago · -1 km deep · 74 km away
  54. 1.99 km NW of Redwood Valley, California · 16487 days ago · 5 km deep · 30 km away
  55. 2.07 km WSW of Cobb, California · 16485 days ago · 0 km deep · 72 km away
  56. 1.79 km WSW of Cobb, California · 16485 days ago · 2 km deep · 72 km away
  57. 1.713 km NNE of Angwin, California · 16481 days ago · 9 km deep · 97 km away
  58. 1.76 km W of Cobb, California · 16481 days ago · 3 km deep · 71 km away
  59. 2.04 km WSW of Cobb, California · 16480 days ago · 4 km deep · 72 km away
  60. 1.66 km ESE of Talmage, California · 16480 days ago · 8 km deep · 37 km away

The first 60 of 114.

Before

  1. 2.18 km NNW of Redwood Valley, California · 16512 days ago · 1 km deep · 28 km away
  2. 2.010 km E of Comptche, California · 16512 days ago · 6 km deep · 48 km away
  3. 2.13 km WSW of Redwood Valley, California · 16513 days ago · 2 km deep · 31 km away
  4. 2.14 km NNE of Clearlake, California · 16514 days ago · 0 km deep · 58 km away
  5. 1.67 km WSW of Cobb, California · 16514 days ago · 1 km deep · 72 km away
  6. 1.75 km WNW of Potter Valley, California · 16515 days ago · -1 km deep · 21 km away
  7. 2.18 km W of Calistoga, California · 16515 days ago · 7 km deep · 99 km away
  8. 2.09 km WSW of Cobb, California · 16516 days ago · 2 km deep · 72 km away
  9. 2.24 km W of Stonyford, California · 16517 days ago · 3 km deep · 32 km away
  10. 2.06 km SW of Cobb, California · 16517 days ago · 1 km deep · 74 km away
  11. 1.96 km W of Stonyford, California · 16517 days ago · 0 km deep · 31 km away
  12. 2.111 km S of Comptche, California · 16517 days ago · 4 km deep · 60 km away
  13. 1.71 km NNW of Boonville, California · 16518 days ago · 4 km deep · 58 km away
  14. 3.15 km WSW of Paskenta, California · 16519 days ago · 4 km deep · 57 km away
  15. 1.67 km NW of Redwood Valley, California · 16519 days ago · 7 km deep · 28 km away
  16. 1.62 km SE of Talmage, California · 16520 days ago · 5 km deep · 38 km away
  17. 2.05 km ESE of Talmage, California · 16520 days ago · 7 km deep · 37 km away
  18. 1.76 km WSW of Cobb, California · 16521 days ago · 1 km deep · 71 km away
  19. 1.97 km WNW of Philo, California · 16521 days ago · 6 km deep · 62 km away
  20. 2.64 km WSW of Cobb, California · 16521 days ago · 3 km deep · 72 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1065345. Read Tue, Sep 22, 2026, 10:35 PM UTC.