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== PRELIMINARY EVENT REPORT ==

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



Version #2: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.

A micro quarry occurred at 11:27:09 AM (PDT) on Monday, July 9, 2018.
The magnitude 1.2 event (a probable quarry explosion) occurred 7 km (4 miles) ESE of Prunedale, CA.
The hypocentral depth is -0.2 km (-0.1 miles).



Magnitude 1.2 - duration magnitude (Md)
Time Monday, July 9, 2018 at 11:27:09 AM (PDT)
Monday, July 9, 2018 at 18:27:09 (UTC)
Distance from Prunedale, CA - 7 km (4 miles) ESE (109 degrees)
Boronda, CA - 9 km (6 miles) NE (49 degrees)
Salinas, CA - 9 km (6 miles) NNE (29 degrees)
San Juan Bautista, CA - 11 km (7 miles) SSW (207 degrees)
Castroville, CA - 15 km (9 miles) E (95 degrees)
Coordinates 36 deg. 45.3 min. N (36.755N), 121 deg. 35.7 min. W (121.595W)
Depth -0.2 km (-0.1 miles)
Quality Fair
Location Quality Parameters Nst=16, Nph=16, Dmin=1.3 km, Rmss=0.1 sec, Erho=0.23 km, Erzz=31.61 km, Gp=113 degrees
Event ID# nc73042301
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