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== PRELIMINARY EVENT REPORT ==

U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California



Version #3: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.

A micro quarry occurred at 11:13:51 AM (PST) on Thursday, December 6, 2018.
The magnitude 1.1 event (a probable quarry explosion) occurred 4 km (3 miles) NE (35 degrees) of Santa Margarita, CA.
The hypocentral depth is -0.45 km (-0.3 miles).



Magnitude 1.1 - duration magnitude (Md)
Time Thursday, December 6, 2018 at 11:13:51 AM (PST)
Thursday, December 6, 2018 at 19:13:51 (UTC)
Distance from Santa Margarita, CA - 4 km (3 miles) NE (35 degrees)
Atascadero, CA - 11 km (7 miles) SE (133 degrees)
San Luis Obispo, CA - 17 km (11 miles) NNE (25 degrees)
Templeton, CA - 18 km (11 miles) SE (142 degrees)
Paso Robles, CA - 24 km (15 miles) SSE (159 degrees)
Coordinates 35 deg. 25.3 min. N (35.422N), 120 deg. 34.9 min. W (120.582W)
Depth -0.45 km (-0.3 miles)
Quality Good
Location Quality Parameters Nst=11, Nph=11, Dmin=3.6 km, Rmss=0.03 sec, Erho=0.19 km, Erzz=31.61 km, Gp=79 degrees
Event ID# nc71110009
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