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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 10:54:34 AM (PST) on Wednesday, February 12, 2020.
The magnitude 1.1 event (a probable quarry explosion) occurred 3 km (2 miles) SSW of Loyola, CA.
The hypocentral depth is -0.33 km (-0.2 miles).



Magnitude 1.1 - duration magnitude (Md)
Time Wednesday, February 12, 2020 at 10:54:34 AM (PST)
Wednesday, February 12, 2020 at 18:54:34 (UTC)
Distance from Loyola, CA - 3 km (2 miles) SSW (193 degrees)
Los Altos, CA - 6 km (4 miles) S (174 degrees)
Los Altos Hills, CA - 6 km (4 miles) SSE (155 degrees)
Mountain View, CA - 7 km (4 miles) SSW (198 degrees)
Cupertino, CA - 7 km (4 miles) W (275 degrees)
Coordinates 37 deg. 19.7 min. N (37.328N), 122 deg. 6.4 min. W (122.107W)
Depth -0.33 km (-0.2 miles)
Quality Fair
Location Quality Parameters Nst=9, Nph=9, Dmin=1.4 km, Rmss=0.09 sec, Erho=0.39 km, Erzz=31.61 km, Gp=127 degrees
Event ID# nc73340180
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