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== PRELIMINARY EVENT REPORT ==

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



Version #5: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.

A micro quarry occurred at 9:11:18 AM (PDT) on Thursday, July 12, 2018.
The magnitude 1.4 event (a probable quarry explosion) occurred 2 km (1 miles) ENE (73 degrees) of Aromas, CA.
The hypocentral depth is -0.13 km (-0.1 miles).



Magnitude 1.4 - duration magnitude (Md)
Time Thursday, July 12, 2018 at 9:11:18 AM (PDT)
Thursday, July 12, 2018 at 16:11:18 (UTC)
Distance from Aromas, CA - 2 km (1 miles) ENE (73 degrees)
San Juan Bautista, CA - 9 km (6 miles) NW (307 degrees)
Las Lomas, CA - 11 km (7 miles) ENE (72 degrees)
Pajaro, CA - 12 km (7 miles) E (95 degrees)
Interlaken, CA - 12 km (7 miles) ESE (122 degrees)
Coordinates 36 deg. 53.7 min. N (36.895N), 121 deg. 37.1 min. W (121.619W)
Depth -0.13 km (-0.1 miles)
Quality Good
Location Quality Parameters Nst=15, Nph=15, Dmin=2.6 km, Rmss=0.13 sec, Erho=0.24 km, Erzz=31.61 km, Gp=81 degrees
Event ID# nc73043916
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