California earthquakes

M1.8 earthquake 15 km WSW of Topaz, California

A magnitude 1.8 earthquake struck 15 km WSW of Topaz, California on Mon, Sep 30, 1985, 2:42 PM PDT (21:42 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.8 11 km E of Buck Meadows, California. This one was a foreshock.

Walker 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
1.8 (md), micro
Local time
UTC
1985-09-30 21:42:35 UTC
Depth
4.5 km (2.8 mi), shallow
Epicenter
38.569° N, 119.683° 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 0.2 km horizontally, 1.0 km in depth
Magnitude uncertainty
±0.24
Depth from
From location
Station coverage gap
92°
Stations used
21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 17 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 2.718 km SE of Walker, California · 14963 days ago · 2 km deep · 37 km away
  2. 2.418 km NNW of Bridgeport, California · 14963 days ago · 2 km deep · 37 km away
  3. 2.418 km NNW of Bridgeport, California · 14963 days ago · 3 km deep · 37 km away
  4. 1.618 km SE of Walker, California · 14963 days ago · 1 km deep · 37 km away
  5. 1.9California-Nevada border region · 14962 days ago · 2 km deep · 37 km away
  6. 2.06 km SSW of Markleeville, California · 14957 days ago · -1 km deep · 12 km away
  7. 1.615 km ENE of Mono City, California · 14957 days ago · 4 km deep · 83 km away
  8. 1.65 km SSW of Markleeville, California · 14951 days ago · 6 km deep · 13 km away
  9. 2.53 km S of Coleville, California · 14948 days ago · 4 km deep · 16 km away
  10. 1.632 km ENE of Lee Vining, California · 14942 days ago · 9 km deep · 98 km away
  11. 2.714 km W of Coleville, California · 14937 days ago · -2 km deep · 1 km away
  12. 1.912 km ENE of Yosemite Valley, California · 14929 days ago · 4 km deep · 91 km away
  13. 1.67 km NNE of Truckee, California · 14925 days ago · 4 km deep · 100 km away
  14. 2.811 km E of Buck Meadows, California · 14924 days ago · 31 km deep · 86 km away
  15. 2.718 km SE of Walker, California · 14923 days ago · 7 km deep · 37 km away
  16. 1.74 km ESE of Columbia, California · 14923 days ago · 20 km deep · 85 km away
  17. 1.810 km E of Buck Meadows, California · 14918 days ago · 28 km deep · 88 km away

Before

  1. 1.716 km E of Mono City, California · 14979 days ago · 6 km deep · 85 km away
  2. 1.815 km ENE of Mono City, California · 14984 days ago · 2 km deep · 83 km away
  3. 1.816 km E of Mono City, California · 14984 days ago · 8 km deep · 85 km away
  4. 2.3California-Nevada border region · 14984 days ago · 7 km deep · 85 km away
  5. 2.66km NNE of Hawthorne, NV · 14987 days ago · 6 km deep · 94 km away
  6. 1.932 km ENE of Lee Vining, California · 14997 days ago · 9 km deep · 98 km away
  7. 1.834 km ENE of Lee Vining, California · 14997 days ago · 3 km deep · 99 km away
  8. 1.88 km SSE of Bear Valley, California · 14999 days ago · 4 km deep · 34 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc56033. Read Wed, Sep 30, 2026, 9:31 PM UTC.