California earthquakes

M1.8 earthquake 12 km W of Gridley, California

A magnitude 1.8 earthquake struck 12 km W of Gridley, California on Sat, Jun 23, 1979, 9:32 AM PDT (16:32 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M2.8 17 km WSW of Paskenta, California. This one was a foreshock.

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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, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1979-06-23 16:32:22 UTC
Depth
3.8 km (2.4 mi), shallow
Epicenter
39.351° N, 121.841° 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 14.7 km horizontally, 16.2 km in depth
Magnitude uncertainty
±0.25
Depth from
From location
Station coverage gap
277°, 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: 16 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 2.03 km SE of Clear Lake Riviera, California · 17262 days ago · 5 km deep · 87 km away
  2. 2.223 km ENE of Potter Valley, California · 17262 days ago · 12 km deep · 88 km away
  3. 1.56 km WNW of Cobb, California · 17261 days ago · 2 km deep · 100 km away
  4. 1.62 km WNW of Rackerby, California · 17261 days ago · 3 km deep · 42 km away
  5. 2.412 km ENE of Princeton, California · 17261 days ago · -1 km deep · 10 km away
  6. 2.24 km ESE of Clearlake Oaks, California · 17261 days ago · 0 km deep · 77 km away
  7. 1.65 km NNE of Clearlake, California · 17255 days ago · 1 km deep · 76 km away
  8. 1.816 km WSW of Stonyford, California · 17255 days ago · 4 km deep · 75 km away
  9. 1.817 km WSW of Stonyford, California · 17255 days ago · 4 km deep · 76 km away
  10. 1.715 km WSW of Stonyford, California · 17255 days ago · 4 km deep · 74 km away
  11. 1.73 km W of Clear Lake Riviera, California · 17251 days ago · 4 km deep · 91 km away
  12. 1.818 km NNE of Nice, California · 17245 days ago · 10 km deep · 77 km away
  13. 1.911 km N of Upper Lake, California · 17245 days ago · 3 km deep · 91 km away
  14. 2.817 km WSW of Paskenta, California · 17242 days ago · 2 km deep · 94 km away
  15. 1.914 km E of Potter Valley, California · 17240 days ago · 9 km deep · 95 km away
  16. 1.53 km WSW of Cobb, California · 17210 days ago · 6 km deep · 100 km away

Before

  1. 2.012 km NW of Moskowite Corner, California · 17276 days ago · 16 km deep · 99 km away
  2. 2.36 km S of Clear Lake Riviera, California · 17291 days ago · 2 km deep · 92 km away
  3. 2.29 km NNW of Moskowite Corner, California · 17294 days ago · 16 km deep · 99 km away
  4. 1.923 km ENE of Potter Valley, California · 17298 days ago · 9 km deep · 88 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1046303. Read Sat, Oct 3, 2026, 11:59 AM UTC.