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== PRELIMINARY EARTHQUAKE REPORT ==

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



Version #10: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.

A micro earthquake occurred at 1:52:02 AM (PST) on Thursday, November 8, 2018.
The magnitude 1.5 event occurred 6 km (4 miles) SW of Clayton, CA.
The hypocentral depth is 13 km ( 8 miles).



Magnitude 1.5 - duration magnitude (Md)
Time Thursday, November 8, 2018 at 1:52:02 AM (PST)
Thursday, November 8, 2018 at 9:52:02 (UTC)
Distance from Clayton, CA - 6 km (4 miles) SW (227 degrees)
Walnut Creek, CA - 7 km (4 miles) E (91 degrees)
Waldon, CA - 7 km (4 miles) ESE (110 degrees)
Alamo, CA - 7 km (5 miles) NE (35 degrees)
Concord, CA - 7 km (5 miles) SSE (158 degrees)
Coordinates 37 deg. 54.3 min. N (37.906N), 121 deg. 59.0 min. W (121.984W)
Depth 13.34 km (8.3 miles)
Quality Excellent
Location Quality Parameters Nst=32, Nph=34, Dmin=6.2 km, Rmss=0.06 sec, Erho=0.21 km, Erzz=0.52 km, Gp=73 degrees
Event ID# nc73108301
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