California earthquakes

M4.3 earthquake 89 km WNW of Samoa, California

A magnitude 4.3 earthquake struck 89 km WNW of Samoa, California on Tue, Jul 23, 1985, 11:04 AM PDT (18:04 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M5.0 63 km WSW of Ferndale, 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
4.3 (ml), light
Local time
UTC
1985-07-23 18:04:38 UTC
Depth
5.4 km (3.4 mi), shallow
Epicenter
40.996° N, 125.228° 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 16.6 km horizontally, 22.1 km in depth
Depth from
From location
Station coverage gap
311°, poorly surrounded by stations
Stations used
14

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 16 in the 30 days before it.

After

  1. 5.063 km WSW of Ferndale, California · 15033 days ago · 4 km deep · 78 km away
  2. 2.627 km SSW of Ferndale, California · 15030 days ago · 15 km deep · 98 km away
  3. 3.418 km W of Big Lagoon, California · 15029 days ago · -1 km deep · 75 km away
  4. 4.281 km WSW of Ferndale, California · 15029 days ago · 4 km deep · 66 km away
  5. 2.680 km WSW of Ferndale, California · 15029 days ago · 4 km deep · 70 km away
  6. 2.779 km W of Ferndale, California · 15020 days ago · 3 km deep · 58 km away
  7. 2.146 km W of Ferndale, California · 15007 days ago · 21 km deep · 66 km away
  8. 1.935 km SW of Ferndale, California · 15007 days ago · 12 km deep · 97 km away
  9. 2.336 km SW of Ferndale, California · 15004 days ago · 20 km deep · 98 km away
  10. 2.028 km SSW of Ferndale, California · 15002 days ago · 13 km deep · 99 km away
  11. 2.644 km WSW of Ferndale, California · 15001 days ago · 17 km deep · 82 km away
  12. 2.599 km W of Indianola, California · 14999 days ago · 5 km deep · 20 km away
  13. 2.4near the coast of Northern California · 14996 days ago · 13 km deep · 87 km away
  14. 2.024 km WSW of Ferndale, California · 14995 days ago · 26 km deep · 85 km away
  15. 2.529 km SW of Ferndale, California · 14991 days ago · 16 km deep · 86 km away
  16. 2.938 km SW of Ferndale, California · 14991 days ago · 19 km deep · 94 km away
  17. 2.837 km SW of Ferndale, California · 14990 days ago · 21 km deep · 97 km away
  18. 2.654 km SW of Ferndale, California · 14986 days ago · 7 km deep · 91 km away
  19. 3.337 km SW of Ferndale, California · 14986 days ago · 2 km deep · 86 km away
  20. 3.656 km WSW of Ferndale, California · 14976 days ago · 7 km deep · 74 km away

Before

  1. 3.685 km W of Ferndale, California · 15043 days ago · 11 km deep · 61 km away
  2. 2.436 km SW of Ferndale, California · 15046 days ago · 9 km deep · 96 km away
  3. 1.7near the coast of Northern California · 15050 days ago · 4 km deep · 99 km away
  4. 1.8near the coast of Northern California · 15051 days ago · 17 km deep · 95 km away
  5. 2.817 km WNW of Indianola, California · 15052 days ago · 6 km deep · 73 km away
  6. 2.128 km SW of Ferndale, California · 15054 days ago · 17 km deep · 93 km away
  7. 1.85 km SW of Ferndale, California · 15054 days ago · 13 km deep · 92 km away
  8. 1.65 km SSE of Ferndale, California · 15054 days ago · 18 km deep · 99 km away
  9. 2.43 km WNW of Fields Landing, California · 15055 days ago · 4 km deep · 87 km away
  10. 1.67 km W of Loleta, California · 15055 days ago · 4 km deep · 87 km away
  11. 2.031 km SW of Ferndale, California · 15055 days ago · 19 km deep · 92 km away
  12. 2.139 km WSW of Ferndale, California · 15056 days ago · 19 km deep · 79 km away
  13. 3.42 km NNW of Fields Landing, California · 15057 days ago · 7 km deep · 89 km away
  14. 2.585 km WSW of Ferndale, California · 15059 days ago · 5 km deep · 77 km away
  15. 2.114 km WNW of Ferndale, California · 15061 days ago · 15 km deep · 80 km away
  16. 2.510 km NW of Fields Landing, California · 15063 days ago · 26 km deep · 80 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1129929. Read Tue, Sep 22, 2026, 11:33 AM UTC.