Recent Earthquakes in California and Nevada


== PRELIMINARY EARTHQUAKE REPORT ==

U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California


Version #3: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.

A micro earthquake occurred at 11:46:21 PM (PDT) on Sunday, April 4, 2021.
The magnitude 1.0 event occurred 23 km (14 miles) SE of Livermore, CA.
The hypocentral depth is 8 km ( 5 miles).


Magnitude 1.0 - duration magnitude (Md)
Time Sunday, April 4, 2021 at 11:46:21 PM (PDT)
Monday, April 5, 2021 at 6:46:21 (UTC)
Distance from Livermore, CA - 23 km (14 miles) SE (128 degrees)
Tracy, CA - 24 km (15 miles) SSW (210 degrees)
Mountain House, CA - 26 km (16 miles) S (183 degrees)
East Foothills, CA - 30 km (18 miles) NE (50 degrees)
Pleasanton, CA - 30 km (19 miles) ESE (114 degrees)
Coordinates 37 deg. 33.2 min. N (37.553N), 121 deg. 33.6 min. W (121.560W)
Depth 7.81 km (4.9 miles)
Quality Good
Location Quality Parameters Nst=22, Nph=29, Dmin=11.0 km, Rmss=0.11 sec, Erho=0.29 km, Erzz=0.89 km, Gp=75 degrees
Event ID# nc73545670
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For more information, see https://earthquake.usgs.gov

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