California earthquakes

M1.8 earthquake 7 km SSW of Markleeville, California

A magnitude 1.8 earthquake struck 7 km SSW of Markleeville, California on Tue, Apr 21, 1987, 5:12 AM PDT (12:12 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M2.3 12 km N of Truckee, California. This one was a foreshock.

Topaz Ranch Estates 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
1987-04-21 12:12:48 UTC
Depth
4.4 km (2.7 mi), shallow
Epicenter
38.625° N, 119.805° 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 2.3 km horizontally, 6.7 km in depth
Magnitude uncertainty
±0.22
Depth from
From location
Station coverage gap
278°, poorly surrounded by stations
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: 16 in the 60 days after this one and 18 in the 30 days before it.

After

  1. 1.65 km S of Markleeville, California · 14399 days ago · 1 km deep · 3 km away
  2. 1.84 km SSW of Mokelumne Hill, California · 14397 days ago · 1 km deep · 90 km away
  3. 2.312 km N of Truckee, California · 14396 days ago · 6 km deep · 96 km away
  4. 1.916 km E of Mono City, California · 14394 days ago · 9 km deep · 98 km away
  5. 2.911 km E of Kirkwood, California · 14393 days ago · -2 km deep · 15 km away
  6. 1.812 km E of Kirkwood, California · 14393 days ago · 1 km deep · 15 km away
  7. 2.13 km E of Truckee, California · 14388 days ago · 7 km deep · 84 km away
  8. 2.416 km E of Mono City, California · 14385 days ago · 9 km deep · 97 km away
  9. 1.95 km NNE of Truckee, California · 14384 days ago · 8 km deep · 88 km away
  10. 1.6California-Nevada border region · 14383 days ago · 3 km deep · 94 km away
  11. 1.510 km SE of Walker, California · 14382 days ago · 5 km deep · 41 km away
  12. 2.51 km S of Mokelumne Hill, California · 14379 days ago · 0 km deep · 87 km away
  13. 2.35 km WNW of Topaz, California · 14365 days ago · 3 km deep · 20 km away
  14. 2.613 km SSE of Mogul, Nevada · 14363 days ago · 5 km deep · 88 km away
  15. 3.39 km SSE of Mogul, Nevada · 14363 days ago · 5 km deep · 91 km away
  16. 1.810 km ESE of Bridgeport, California · 14341 days ago · 3 km deep · 74 km away

Before

  1. 2.67 km SSW of Markleeville, California · 14399 days ago · -1 km deep · 0 km away
  2. 2.12 km SW of Walker, California · 14400 days ago · 5 km deep · 30 km away
  3. 3.10 km NW of Mesa Vista, California · 14402 days ago · -1 km deep · 21 km away
  4. 1.95 km SW of Mokelumne Hill, California · 14403 days ago · 0 km deep · 91 km away
  5. 1.52 km W of Soda Springs, California · 14406 days ago · 5 km deep · 94 km away
  6. 2.410 km SSE of Walker, California · 14406 days ago · 3 km deep · 39 km away
  7. 2.49 km E of Markleeville, California · 14409 days ago · 2 km deep · 13 km away
  8. 2.110 km S of Truckee, California · 14410 days ago · 8 km deep · 76 km away
  9. 2.512 km WNW of Bridgeport, California · 14411 days ago · 7 km deep · 52 km away
  10. 2.29 km SSE of Walker, California · 14411 days ago · 1 km deep · 39 km away
  11. 2.511 km NNW of Bridgeport, California · 14414 days ago · 6 km deep · 54 km away
  12. 2.310 km E of Markleeville, California · 14415 days ago · -1 km deep · 14 km away
  13. 1.715 km S of Kingvale, California · 14415 days ago · -1 km deep · 83 km away
  14. 3.114 km S of Kingvale, California · 14415 days ago · 0 km deep · 85 km away
  15. 1.97 km ESE of Mono City, California · 14421 days ago · 10 km deep · 93 km away
  16. 1.820 km ENE of Mono City, California · 14423 days ago · 6 km deep · 95 km away
  17. 1.69 km WNW of Topaz Lake, Nevada · 14424 days ago · 0 km deep · 18 km away
  18. 2.411 km WNW of Bridgeport, California · 14428 days ago · 5 km deep · 55 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc98989. Read Tue, Sep 22, 2026, 9:29 PM UTC.