California earthquakes

M4.0 earthquake 114 km W of Ferndale, California

A magnitude 4.0 earthquake struck 114 km W of Ferndale, California on Sat, Apr 6, 1985, 12:40 PM PST (20:40 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M4.3 104 km W of Ferndale, California. This one was a foreshock.

Ferndale 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
4.0 (ml), light
Local time
UTC
1985-04-06 20:40:35 UTC
Depth
4.7 km (2.9 mi), shallow
Epicenter
40.629° N, 125.611° 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 5.1 km horizontally, 15.3 km in depth
Depth from
From location
Station coverage gap
288°, poorly surrounded by stations
Stations used
55

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 20 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 2.237 km WSW of Ferndale, California · 15142 days ago · 25 km deep · 81 km away
  2. 3.089 km W of Ferndale, California · 15140 days ago · 35 km deep · 26 km away
  3. 3.442 km WSW of Ferndale, California · 15136 days ago · 15 km deep · 74 km away
  4. 3.441 km WSW of Ferndale, California · 15134 days ago · 18 km deep · 84 km away
  5. 2.431 km W of Ferndale, California · 15133 days ago · 17 km deep · 82 km away
  6. 2.763 km WSW of Ferndale, California · 15132 days ago · -1 km deep · 56 km away
  7. 1.818 km W of Ferndale, California · 15129 days ago · 4 km deep · 96 km away
  8. 2.946 km WSW of Ferndale, California · 15129 days ago · 4 km deep · 73 km away
  9. 2.9118km W of Ferndale, CA · 15127 days ago · 22 km deep · 9 km away
  10. 2.8155km W of Petrolia, CA · 15116 days ago · 10 km deep · 49 km away
  11. 2.344 km SW of Ferndale, California · 15114 days ago · 21 km deep · 89 km away
  12. 2.326 km W of Samoa, California · 15110 days ago · 18 km deep · 97 km away
  13. 4.3104 km W of Ferndale, California · 15108 days ago · 7 km deep · 25 km away
  14. 3.0off the coast of Northern California · 15106 days ago · 2 km deep · 43 km away
  15. 2.630 km SW of Ferndale, California · 15105 days ago · 17 km deep · 98 km away
  16. 3.394 km W of Ferndale, California · 15103 days ago · 3 km deep · 26 km away
  17. 2.586 km W of Ferndale, California · 15101 days ago · 4 km deep · 37 km away
  18. 2.021 km WNW of Indianola, California · 15091 days ago · 4 km deep · 98 km away
  19. 2.628 km SW of Ferndale, California · 15087 days ago · 24 km deep · 95 km away
  20. 2.152 km SW of Ferndale, California · 15087 days ago · 19 km deep · 83 km away

Before

  1. 3.543 km SW of Ferndale, California · 15144 days ago · 23 km deep · 83 km away
  2. 2.9122 km WSW of Ferndale, California · 15145 days ago · 4 km deep · 35 km away
  3. 2.354 km W of Ferndale, California · 15146 days ago · 4 km deep · 61 km away
  4. 2.843 km SSW of Ferndale, California · 15150 days ago · 11 km deep · 100 km away
  5. 3.071 km W of Ferndale, California · 15152 days ago · 4 km deep · 42 km away
  6. 2.932 km SW of Ferndale, California · 15160 days ago · 20 km deep · 98 km away
  7. 3.043 km SW of Ferndale, California · 15161 days ago · 18 km deep · 88 km away
  8. 2.761 km WSW of Ferndale, California · 15166 days ago · 25 km deep · 66 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc45544 (also filed as usp0002dj5). Read Tue, Sep 22, 2026, 4:01 PM UTC.