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== PRELIMINARY EARTHQUAKE 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 earthquake occurred at 2:01:09 PM (PST) on Thursday, December 6, 2018.
The magnitude 1.8 event occurred 9 km (6 miles) ENE (62 degrees) of Napa, CA.
The hypocentral depth is 8 km ( 5 miles).



Magnitude 1.8 - duration magnitude (Md)
Time Thursday, December 6, 2018 at 2:01:09 PM (PST)
Thursday, December 6, 2018 at 22:01:09 (UTC)
Distance from Napa, CA - 9 km (6 miles) ENE (62 degrees)
Green Valley, CA - 10 km (6 miles) NNW (345 degrees)
Fairfield, CA - 16 km (10 miles) NW (306 degrees)
Yountville, CA - 17 km (10 miles) ESE (116 degrees)
Suisun, CA - 17 km (11 miles) NW (310 degrees)
Coordinates 38 deg. 20.2 min. N (38.336N), 122 deg. 11.5 min. W (122.191W)
Depth 8.04 km (5.0 miles)
Quality Excellent
Location Quality Parameters Nst=23, Nph=24, Dmin=6.5 km, Rmss=0.07 sec, Erho=0.22 km, Erzz=0.69 km, Gp=64 degrees
Event ID# nc73119706
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