California earthquakes

M1.8 earthquake 11 km W of Trinity Center, California

A magnitude 1.8 earthquake struck 11 km W of Trinity Center, California on Wed, Jul 3, 1985, 10:16 PM PDT (05:16 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M2.3 18 km NNW of Junction City, 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), micro
Local time
UTC
1985-07-04 05:16:00 UTC
Depth
6.5 km (4.0 mi), shallow
Epicenter
40.977° N, 122.839° 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 3.7 km horizontally, 6.7 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
131°
Stations used
7

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 15 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 2.318 km NNW of Junction City, California · 15052 days ago · 32 km deep · 31 km away
  2. 2.07 km NNE of Hyampom, California · 15049 days ago · 4 km deep · 59 km away
  3. 2.820 km ENE of Hydesville, California · 15029 days ago · 21 km deep · 96 km away
  4. 2.56 km E of Hayfork, California · 15025 days ago · 28 km deep · 52 km away
  5. 1.514 km E of Cottonwood, California · 15025 days ago · 10 km deep · 90 km away
  6. 3.725 km NNW of Junction City, California · 15022 days ago · 28 km deep · 29 km away
  7. 1.611 km WNW of Burney, California · 15020 days ago · 4 km deep · 89 km away
  8. 2.18km NNW of French Gulch, CA · 15016 days ago · 19 km deep · 27 km away
  9. 1.96km ESE of Millville, CA · 15007 days ago · 17 km deep · 78 km away
  10. 2.113 km ESE of Carrick, California · 15006 days ago · 2 km deep · 72 km away
  11. 2.18 km ESE of Carrick, California · 15005 days ago · -2 km deep · 70 km away
  12. 1.613 km E of Carrick, California · 15005 days ago · 3 km deep · 75 km away
  13. 2.111 km WNW of Hyampom, California · 15004 days ago · 20 km deep · 73 km away
  14. 2.419 km SSE of Blue Lake, California · 14999 days ago · 24 km deep · 92 km away
  15. 1.922 km ESE of Orick, California · 14997 days ago · 4 km deep · 86 km away

Before

  1. 1.6Northern California · 15062 days ago · 25 km deep · 48 km away
  2. 1.77 km SSW of Lakehead, California · 15062 days ago · 4 km deep · 39 km away
  3. 1.88 km NNW of McCloud, California · 15063 days ago · 6 km deep · 69 km away
  4. 1.726 km N of Willow Creek, California · 15063 days ago · 4 km deep · 69 km away
  5. 2.92 km N of Burnt Ranch, California · 15064 days ago · 20 km deep · 56 km away
  6. 1.85 km E of Redding, California · 15076 days ago · 19 km deep · 61 km away
  7. 1.620 km W of Hyampom, California · 15076 days ago · 4 km deep · 84 km away
  8. 2.2Northern California · 15078 days ago · 10 km deep · 58 km away
  9. 2.56 km N of Millville, California · 15080 days ago · 23 km deep · 70 km away
  10. 3.014 km WSW of Hayfork, California · 15081 days ago · 33 km deep · 67 km away
  11. 1.915 km E of Cottonwood, California · 15082 days ago · 11 km deep · 90 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc51173. Read Wed, Sep 23, 2026, 5:41 AM UTC.