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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 12:54:52 PM (PDT) on Monday, August 12, 2019.
The magnitude 1.2 event (a probable quarry explosion) occurred 2 km (1 miles) SW of Clayton, CA.
The hypocentral depth is -0.26 km (-0.2 miles).



Magnitude 1.2 - duration magnitude (Md)
Time Monday, August 12, 2019 at 12:54:52 PM (PDT)
Monday, August 12, 2019 at 19:54:52 (UTC)
Distance from Clayton, CA - 2 km (1 miles) SW (216 degrees)
Concord, CA - 7 km (5 miles) SE (132 degrees)
Waldon, CA - 9 km (6 miles) E (92 degrees)
Walnut Creek, CA - 10 km (6 miles) E (79 degrees)
Pleasant Hill, CA - 10 km (6 miles) ESE (106 degrees)
Coordinates 37 deg. 55.4 min. N (37.923N), 121 deg. 57.1 min. W (121.952W)
Depth -0.26 km (-0.2 miles)
Quality Good
Location Quality Parameters Nst=12, Nph=13, Dmin=2.8 km, Rmss=0.07 sec, Erho=0.22 km, Erzz=31.61 km, Gp=81 degrees
Event ID# nc73249715
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