California earthquakes

M2.9 earthquake 118km W of Ferndale, CA

A magnitude 2.9 earthquake struck 118km W of Ferndale, CA on Tue, Apr 23, 1985, 4:36 PM PST (00:36 UTC), 22 km (14 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
2.9 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1985-04-24 00:36:42 UTC
Depth
21.9 km (13.6 mi), shallow
Epicenter
40.560° N, 125.665° 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 3.9 km horizontally, 31.6 km in depth
Magnitude uncertainty
±0.12
Depth from
Operator assigned
Station coverage gap
316°, 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: 8 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 2.8155km W of Petrolia, CA · 15125 days ago · 10 km deep · 41 km away
  2. 2.344 km SW of Ferndale, California · 15123 days ago · 21 km deep · 91 km away
  3. 4.3104 km W of Ferndale, California · 15117 days ago · 7 km deep · 22 km away
  4. 3.0off the coast of Northern California · 15115 days ago · 2 km deep · 45 km away
  5. 3.394 km W of Ferndale, California · 15112 days ago · 3 km deep · 26 km away
  6. 2.586 km W of Ferndale, California · 15110 days ago · 4 km deep · 37 km away
  7. 2.628 km SW of Ferndale, California · 15096 days ago · 24 km deep · 98 km away
  8. 2.152 km SW of Ferndale, California · 15096 days ago · 19 km deep · 84 km away

Before

  1. 2.946 km WSW of Ferndale, California · 15138 days ago · 4 km deep · 75 km away
  2. 2.763 km WSW of Ferndale, California · 15141 days ago · -1 km deep · 58 km away
  3. 2.431 km W of Ferndale, California · 15142 days ago · 17 km deep · 87 km away
  4. 3.441 km WSW of Ferndale, California · 15143 days ago · 18 km deep · 86 km away
  5. 3.442 km WSW of Ferndale, California · 15146 days ago · 15 km deep · 78 km away
  6. 3.089 km W of Ferndale, California · 15149 days ago · 35 km deep · 30 km away
  7. 2.237 km WSW of Ferndale, California · 15151 days ago · 25 km deep · 84 km away
  8. 4.0114 km W of Ferndale, California · 15153 days ago · 5 km deep · 9 km away
  9. 3.543 km SW of Ferndale, California · 15153 days ago · 23 km deep · 85 km away
  10. 2.9122 km WSW of Ferndale, California · 15154 days ago · 4 km deep · 27 km away
  11. 2.354 km W of Ferndale, California · 15155 days ago · 4 km deep · 65 km away
  12. 3.071 km W of Ferndale, California · 15161 days ago · 4 km deep · 47 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc47416. Read Thu, Oct 1, 2026, 9:22 PM UTC.