California earthquakes

M1.8 earthquake 1 km SSW of Hamilton City, California

A magnitude 1.8 earthquake struck 1 km SSW of Hamilton City, California on Mon, Nov 9, 1981, 6:17 PM PST (02:17 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M1.8 6 km NNW of Bucks Lake, California. This one was a foreshock.

Hamilton City 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
1981-11-10 02:17:16 UTC
Depth
6.2 km (3.8 mi), shallow
Epicenter
39.733° N, 122.022° 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 0.8 km horizontally, 5.2 km in depth
Magnitude uncertainty
±0.30
Depth from
From location
Station coverage gap
128°
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: 41 in the 60 days after this one and 13 in the 30 days before it.

After

  1. 1.715 km WSW of Paskenta, California · 16387 days ago · 4 km deep · 61 km away
  2. 1.5Northern California · 16387 days ago · 19 km deep · 7 km away
  3. 1.78 km S of Hamilton City, California · 16387 days ago · 17 km deep · 7 km away
  4. 1.86 km NNW of Bucks Lake, California · 16382 days ago · 11 km deep · 72 km away
  5. 1.619 km ENE of Potter Valley, California · 16373 days ago · 1 km deep · 85 km away
  6. 1.511 km NNE of Potter Valley, California · 16372 days ago · 3 km deep · 97 km away
  7. 2.320 km NE of Potter Valley, California · 16372 days ago · 7 km deep · 84 km away
  8. 1.610 km ESE of Covelo, California · 16366 days ago · -1 km deep · 95 km away
  9. 2.238 km WNW of Paskenta, California · 16365 days ago · 2 km deep · 86 km away
  10. 1.93 km S of South Oroville, California · 16365 days ago · 11 km deep · 50 km away
  11. 1.815 km WSW of Chester, California · 16364 days ago · 3 km deep · 79 km away
  12. 1.62 km E of Shingletown, California · 16363 days ago · 3 km deep · 85 km away
  13. 1.829 km WSW of Paskenta, California · 16363 days ago · 10 km deep · 70 km away
  14. 1.621 km W of Stonyford, California · 16363 days ago · 1 km deep · 76 km away
  15. 1.94 km NW of Lake Almanor West, California · 16362 days ago · 26 km deep · 88 km away
  16. 1.917 km NNE of Upper Lake, California · 16361 days ago · 6 km deep · 84 km away
  17. 2.221 km W of Stonyford, California · 16359 days ago · 4 km deep · 76 km away
  18. 1.85 km WNW of Manton, California · 16359 days ago · 3 km deep · 80 km away
  19. 2.314 km WNW of Paskenta, California · 16358 days ago · 7 km deep · 63 km away
  20. 2.721 km W of Stonyford, California · 16358 days ago · 4 km deep · 76 km away
  21. 2.0Northern California · 16358 days ago · 2 km deep · 76 km away
  22. 2.77 km WNW of Paradise, California · 16357 days ago · 5 km deep · 27 km away
  23. 2.12 km SE of South Oroville, California · 16355 days ago · 9 km deep · 50 km away
  24. 1.63 km NNW of Clearlake, California · 16353 days ago · 73 km deep · 99 km away
  25. 2.512 km NW of Stonyford, California · 16352 days ago · 9 km deep · 64 km away
  26. 2.512 km WNW of Stonyford, California · 16352 days ago · 9 km deep · 64 km away
  27. 2.48 km WNW of Belden, California · 16347 days ago · 4 km deep · 67 km away
  28. 1.620 km NE of Potter Valley, California · 16347 days ago · 4 km deep · 85 km away
  29. 1.720 km NE of Potter Valley, California · 16347 days ago · 7 km deep · 85 km away
  30. 1.64 km N of Shingletown, California · 16346 days ago · 3 km deep · 90 km away
  31. 1.86 km W of Dobbins, California · 16345 days ago · 14 km deep · 75 km away
  32. 2.110 km SW of Lake Almanor West, California · 16344 days ago · 4 km deep · 79 km away
  33. 1.631 km ESE of Covelo, California · 16343 days ago · 7 km deep · 75 km away
  34. 2.20 km WNW of Millville, California · 16341 days ago · 19 km deep · 92 km away
  35. 1.814 km NNE of Mineral, California · 16340 days ago · 2 km deep · 92 km away
  36. 1.95 km NNE of Clearlake, California · 16339 days ago · -1 km deep · 95 km away
  37. 1.914 km NNE of Mineral, California · 16335 days ago · 3 km deep · 91 km away
  38. 2.73 km WNW of Greenville, California · 16335 days ago · 2 km deep · 99 km away
  39. 1.912 km NE of Lucerne, California · 16332 days ago · 0 km deep · 86 km away
  40. 1.621 km WSW of Old Station, California · 16329 days ago · 7 km deep · 99 km away
  41. 1.71 km NNE of Loma Rica, California · 16328 days ago · 5 km deep · 69 km away

Before

  1. 1.912 km NNW of Shingletown, California · 16388 days ago · 3 km deep · 96 km away
  2. 2.615 km ENE of Shingletown, California · 16390 days ago · 9 km deep · 93 km away
  3. 2.523 km W of Elk Creek, California · 16391 days ago · 6 km deep · 68 km away
  4. 1.73 km NW of Chester, California · 16391 days ago · 2 km deep · 92 km away
  5. 1.55 km NW of Chester, California · 16391 days ago · 2 km deep · 92 km away
  6. 2.79 km NE of Gerber, California · 16392 days ago · 24 km deep · 42 km away
  7. 2.66 km N of Robbins, California · 16398 days ago · 21 km deep · 94 km away
  8. 2.129 km WSW of Paskenta, California · 16402 days ago · 11 km deep · 73 km away
  9. 3.110 km N of Chico, California · 16403 days ago · 22 km deep · 18 km away
  10. 1.510 km NE of Mineral, California · 16414 days ago · -2 km deep · 88 km away
  11. 2.26 km WSW of Paradise, California · 16416 days ago · 16 km deep · 29 km away
  12. 2.214 km S of Hamilton City, California · 16416 days ago · 23 km deep · 14 km away
  13. 1.618 km NE of Upper Lake, California · 16416 days ago · 5 km deep · 82 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1069320. Read Tue, Sep 22, 2026, 10:41 AM UTC.