California earthquakes

M2.0 earthquake 11 km W of Richvale, California

A magnitude 2.0 earthquake struck 11 km W of Richvale, California on Wed, May 20, 1987, 2:46 PM PDT (21:46 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.2 23 km NE of Potter Valley, California. This one was a foreshock.

Biggs 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
2.0 (md), micro
Local time
UTC
1987-05-20 21:46:03 UTC
Depth
5.2 km (3.2 mi), shallow
Epicenter
39.499° N, 121.882° 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 2.5 km horizontally, 7.9 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
239°, poorly surrounded by stations
Stations used
4

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 22 in the 60 days after this one and 13 in the 30 days before it.

After

  1. 1.815 km N of Princeton, California · 14376 days ago · 20 km deep · 11 km away
  2. 1.5Northern California · 14376 days ago · 8 km deep · 92 km away
  3. 1.86 km SSE of Cottonwood, California · 14376 days ago · 0 km deep · 100 km away
  4. 1.716 km NNE of Upper Lake, California · 14369 days ago · 4 km deep · 83 km away
  5. 2.37 km SSW of Hamilton City, California · 14366 days ago · 17 km deep · 24 km away
  6. 1.86 km SSW of Sutter, California · 14366 days ago · 5 km deep · 45 km away
  7. 1.817 km ENE of Potter Valley, California · 14361 days ago · 7 km deep · 92 km away
  8. 2.10 km WNW of Butte Meadows, California · 14359 days ago · 16 km deep · 71 km away
  9. 1.613 km NNW of Belden, California · 14357 days ago · 3 km deep · 85 km away
  10. 1.69 km E of Hidden Valley Lake, California · 14356 days ago · 6 km deep · 90 km away
  11. 1.714 km SE of Hidden Valley Lake, California · 14351 days ago · -1 km deep · 97 km away
  12. 1.920 km WNW of Butte Meadows, California · 14347 days ago · 8 km deep · 75 km away
  13. 2.017 km NNE of Angwin, California · 14346 days ago · 9 km deep · 96 km away
  14. 1.521 km ENE of Potter Valley, California · 14344 days ago · 9 km deep · 86 km away
  15. 2.115 km S of Hamilton City, California · 14337 days ago · 10 km deep · 14 km away
  16. 3.223 km NE of Potter Valley, California · 14336 days ago · 9 km deep · 91 km away
  17. 1.69 km W of Lake Almanor West, California · 14335 days ago · 7 km deep · 94 km away
  18. 2.59 km NW of Stonyford, California · 14334 days ago · 6 km deep · 65 km away
  19. 2.29 km SW of Prattville, California · 14328 days ago · 4 km deep · 90 km away
  20. 1.91 km ENE of Gerber, California · 14323 days ago · 27 km deep · 66 km away
  21. 1.86 km SSW of Lake Almanor West, California · 14319 days ago · 5 km deep · 94 km away
  22. 1.817 km NNE of Angwin, California · 14316 days ago · 6 km deep · 97 km away

Before

  1. 1.62 km SSW of Sutter, California · 14381 days ago · 5 km deep · 41 km away
  2. 2.220 km NE of Potter Valley, California · 14383 days ago · 7 km deep · 90 km away
  3. 1.714 km ESE of Hidden Valley Lake, California · 14383 days ago · 1 km deep · 96 km away
  4. 2.314 km SW of Durham, California · 14384 days ago · 27 km deep · 5 km away
  5. 1.918 km NE of Upper Lake, California · 14386 days ago · 8 km deep · 79 km away
  6. 1.619 km N of Upper Lake, California · 14387 days ago · 4 km deep · 87 km away
  7. 1.73 km SSW of Hamilton City, California · 14388 days ago · 13 km deep · 27 km away
  8. 1.83 km S of Hamilton City, California · 14388 days ago · 10 km deep · 26 km away
  9. 2.011 km NNE of Butte Meadows, California · 14397 days ago · 7 km deep · 82 km away
  10. 1.85 km NE of Clipper Mills, California · 14399 days ago · 13 km deep · 66 km away
  11. 1.87 km NE of Upper Lake, California · 14400 days ago · 6 km deep · 89 km away
  12. 1.615 km ENE of Potter Valley, California · 14400 days ago · 6 km deep · 92 km away
  13. 1.512 km NE of Lucerne, California · 14406 days ago · 13 km deep · 80 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc100729. Read Tue, Sep 29, 2026, 6:25 AM UTC.