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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 10:48:42 AM (PST) on Thursday, December 6, 2018.
The magnitude 1.5 event (a probable quarry explosion) occurred 3 km (2 miles) S of Loyola, CA.
The hypocentral depth is -0.26 km (-0.2 miles).



Magnitude 1.5 - duration magnitude (Md)
Time Thursday, December 6, 2018 at 10:48:42 AM (PST)
Thursday, December 6, 2018 at 18:48:42 (UTC)
Distance from Loyola, CA - 3 km (2 miles) S (185 degrees)
Cupertino, CA - 6 km (4 miles) W (270 degrees)
Los Altos, CA - 7 km (4 miles) S (173 degrees)
Los Altos Hills, CA - 7 km (4 miles) SSE (155 degrees)
Mountain View, CA - 7 km (5 miles) SSW (194 degrees)
Coordinates 37 deg. 19.4 min. N (37.323N), 122 deg. 6.2 min. W (122.104W)
Depth -0.26 km (-0.2 miles)
Quality Fair
Location Quality Parameters Nst=9, Nph=9, Dmin=1.6 km, Rmss=0.04 sec, Erho=0.37 km, Erzz=31.61 km, Gp=100 degrees
Event ID# nc73119636
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