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== PRELIMINARY EARTHQUAKE REPORT ==

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



Version #0: This report supersedes any earlier reports of this event. This is a computer-generated message. This event has not yet been reviewed by a seismologist.

A micro earthquake occurred at 4:15:02 PM (PST) on Thursday, December 6, 2018.
The magnitude 1.0 event occurred 4 km (2 miles) NNW of The Geysers, CA.
The hypocentral depth is 1 km ( 1 mile).



Magnitude 1.0 - duration magnitude (Md)
Time Thursday, December 6, 2018 at 4:15:02 PM (PST)
Friday, December 7, 2018 at 0:15:02 (UTC)
Distance from The Geysers, CA - 4 km (2 miles) NNW (328 degrees)
Cobb, CA - 5 km (3 miles) WSW (249 degrees)
Middletown, CA - 15 km (10 miles) WNW (293 degrees)
Lower Lake, CA - 19 km (12 miles) SW (231 degrees)
Hidden Valley Lake, CA - 19 km (12 miles) W (269 degrees)
Coordinates 38 deg. 48.3 min. N (38.805N), 122 deg. 46.7 min. W (122.779W)
Depth 1.12 km (0.7 miles)
Quality Excellent
Location Quality Parameters Nst=12, Nph=12, Dmin=1.6 km, Rmss=0.02 sec, Erho=0.23 km, Erzz=0.69 km, Gp=59 degrees
Event ID# nc73119736
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