Recent Earthquakes in California and Nevada


== PRELIMINARY EVENT 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 quarry occurred at 9:36:15 AM (PDT) on Friday, April 30, 2021.
The magnitude 1.5 event (a probable quarry explosion) occurred 2 km (1 miles) ENE (78 degrees) of Aromas, CA.
The hypocentral depth is -0.13 km (-0.1 miles).


Magnitude 1.5 - duration magnitude (Md)
Time Friday, April 30, 2021 at 9:36:15 AM (PDT)
Friday, April 30, 2021 at 16:36:15 (UTC)
Distance from Aromas, CA - 2 km (1 miles) ENE (78 degrees)
San Juan Bautista, CA - 9 km (6 miles) NW (305 degrees)
Pajaro, CA - 11 km (7 miles) E (96 degrees)
Las Lomas, CA - 11 km (7 miles) ENE (73 degrees)
Interlaken, CA - 12 km (7 miles) ESE (123 degrees)
Coordinates 36 deg. 53.5 min. N (36.892N), 121 deg. 37.2 min. W (121.621W)
Depth -0.13 km (-0.1 miles)
Quality Fair
Location Quality Parameters Nst=18, Nph=18, Dmin=5.6 km, Rmss=0.08 sec, Erho=0.22 km, Erzz=31.61 km, Gp=72 degrees
Event ID# nc73556530
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