California earthquakes

M1.6 earthquake 16 km E of Willows, California

A magnitude 1.6 earthquake struck 16 km E of Willows, California on Sat, Jul 25, 1987, 1:27 AM PDT (08:27 UTC), 21 km (13 mi) below the surface.

A larger quake followed: M4.3 29 km NW of Paskenta, California. This one was a foreshock.

Willows 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
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1987-07-25 08:27:20 UTC
Depth
20.7 km (12.9 mi), shallow
Epicenter
39.549° N, 122.009° 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 0.9 km horizontally, 1.1 km in depth
Magnitude uncertainty
±0.39
Depth from
From location
Station coverage gap
233°, poorly surrounded by stations
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: 27 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 2.68 km SW of Paynes Creek, California · 14305 days ago · 19 km deep · 82 km away
  2. 1.68 km SW of Paynes Creek, California · 14305 days ago · 11 km deep · 82 km away
  3. 1.72 km SSW of Clearlake, California · 14291 days ago · 3 km deep · 87 km away
  4. 1.59 km ESE of Hidden Valley Lake, California · 14291 days ago · 5 km deep · 94 km away
  5. 2.110 km ENE of Lucerne, California · 14288 days ago · 24 km deep · 74 km away
  6. 2.16 km E of Hidden Valley Lake, California · 14280 days ago · 14 km deep · 92 km away
  7. 3.914 km WSW of Lake Almanor West, California · 14280 days ago · 4 km deep · 89 km away
  8. 4.329 km NW of Paskenta, California · 14278 days ago · 42 km deep · 88 km away
  9. 2.333km WNW of Rancho Tehama Reserve, CA · 14278 days ago · 42 km deep · 89 km away
  10. 2.028 km NNE of Potter Valley, California · 14277 days ago · 13 km deep · 83 km away
  11. 1.99 km WSW of Paynes Creek, California · 14276 days ago · 10 km deep · 83 km away
  12. 2.05 km SSE of Kelseyville, California · 14275 days ago · 0 km deep · 98 km away
  13. 2.026 km NNE of Potter Valley, California · 14273 days ago · 4 km deep · 86 km away
  14. 1.824 km NNE of Potter Valley, California · 14270 days ago · 6 km deep · 84 km away
  15. 3.36 km NNW of Chico, California · 14264 days ago · 24 km deep · 29 km away
  16. 2.822 km NE of Potter Valley, California · 14263 days ago · 12 km deep · 79 km away
  17. 1.921 km NE of Potter Valley, California · 14263 days ago · 11 km deep · 80 km away
  18. 2.921 km NE of Potter Valley, California · 14262 days ago · 10 km deep · 81 km away
  19. 1.922 km NE of Potter Valley, California · 14262 days ago · 10 km deep · 80 km away
  20. 1.721 km NE of Potter Valley, California · 14262 days ago · 11 km deep · 80 km away
  21. 1.921 km NE of Potter Valley, California · 14262 days ago · 11 km deep · 80 km away
  22. 3.024 km NE of Potter Valley, California · 14262 days ago · -1 km deep · 78 km away
  23. 1.617 km N of Upper Lake, California · 14259 days ago · 1 km deep · 80 km away
  24. 2.018 km NE of Potter Valley, California · 14258 days ago · 6 km deep · 84 km away
  25. 1.73 km ENE of Hamilton City, California · 14257 days ago · 14 km deep · 23 km away
  26. 1.74 km SE of Clear Lake Riviera, California · 14254 days ago · 7 km deep · 90 km away
  27. 1.73 km ENE of Chico, California · 14254 days ago · 21 km deep · 27 km away

Before

  1. 1.93 km NW of Hidden Valley Lake, California · 14317 days ago · 22 km deep · 94 km away
  2. 1.817 km NNE of Angwin, California · 14319 days ago · 6 km deep · 97 km away
  3. 1.86 km SSW of Lake Almanor West, California · 14321 days ago · 5 km deep · 97 km away
  4. 1.91 km ENE of Gerber, California · 14325 days ago · 27 km deep · 58 km away
  5. 2.29 km SW of Prattville, California · 14330 days ago · 4 km deep · 94 km away
  6. 1.711 km E of Calpella, California · 14331 days ago · 1 km deep · 99 km away
  7. 2.39 km W of Manton, California · 14334 days ago · 8 km deep · 99 km away
  8. 2.59 km NW of Stonyford, California · 14336 days ago · 6 km deep · 55 km away
  9. 1.69 km W of Lake Almanor West, California · 14338 days ago · 7 km deep · 96 km away
  10. 3.223 km NE of Potter Valley, California · 14338 days ago · 9 km deep · 81 km away
  11. 2.115 km S of Hamilton City, California · 14339 days ago · 10 km deep · 6 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc10084648. Read Thu, Oct 1, 2026, 5:12 PM UTC.