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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 11:50:42 AM (PDT) on Thursday, October 11, 2018.
The magnitude 1.2 event (a probable quarry explosion) occurred 6 km (4 miles) ESE of Santa Venetia, CA.
The hypocentral depth is 0 km (0.0 miles).



Magnitude 1.2 - duration magnitude (Md)
Time Thursday, October 11, 2018 at 11:50:42 AM (PDT)
Thursday, October 11, 2018 at 18:50:42 (UTC)
Distance from Santa Venetia, CA - 6 km (4 miles) ESE (104 degrees)
San Rafael, CA - 7 km (4 miles) ENE (78 degrees)
North Richmond, CA - 8 km (5 miles) WNW (291 degrees)
San Anselmo, CA - 9 km (6 miles) E (82 degrees)
Kentfield, CA - 9 km (6 miles) ENE (67 degrees)
Coordinates 37 deg. 59.1 min. N (37.986N), 122 deg. 27.5 min. W (122.458W)
Depth 0 km (0.0 miles)
Quality Fair
Location Quality Parameters Nst=18, Nph=18, Dmin=5.9 km, Rmss=0.09 sec, Erho=0.39 km, Erzz=31.61 km, Gp=141 degrees
Event ID# nc73096156
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