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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 10:53:12 AM (PST) on Wednesday, January 9, 2019.
The magnitude 1.7 event (a probable quarry explosion) occurred 3 km (2 miles) S of Loyola, CA.
The hypocentral depth is -0.36 km (-0.2 miles).



Magnitude 1.7 - duration magnitude (Md)
Time Wednesday, January 9, 2019 at 10:53:12 AM (PST)
Wednesday, January 9, 2019 at 18:53:12 (UTC)
Distance from Loyola, CA - 3 km (2 miles) S (181 degrees)
Cupertino, CA - 6 km (4 miles) W (271 degrees)
Los Altos, CA - 7 km (4 miles) S (171 degrees)
Los Altos Hills, CA - 7 km (4 miles) SSE (153 degrees)
Mountain View, CA - 7 km (4 miles) SSW (193 degrees)
Coordinates 37 deg. 19.5 min. N (37.324N), 122 deg. 6.1 min. W (122.101W)
Depth -0.36 km (-0.2 miles)
Quality Poor
Location Quality Parameters Nst=4, Nph=4, Dmin=1.3 km, Rmss=0.05 sec, Erho=0.6 km, Erzz=31.61 km, Gp=124 degrees
Event ID# nc73131346
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