2023-10-18 16:29:14 UPDATED: (M4.1) Northern California 38.1 -121.6 (1cbfb)

[USGS ENS <ens@xxxxxxxxxxxx>]

M4.1 Earthquake - Northern California

Preliminary Report

Magnitude	4.1
Date-Time	Universal Time (UTC): 18 Oct 2023 16:29:15 Time near the Epicenter (1): 18 Oct 2023 09:29:15 Time in your area (1): 18 Oct 2023 08:29:15
Location	38.126N 121.632W
Depth	10 km
Distances	4.4 km (2.7 mi) SSW of Isleton, California 15.9 km (9.9 mi) NNE of Oakley, California 20.3 km (12.6 mi) NE of Antioch, California 22.3 km (13.8 mi) NNE of Brentwood, California 52.0 km (32.2 mi) SSW of Sacramento, California
Location Uncertainty	Horizontal: 0.4 km; Vertical 0.7 km
Parameters	Nph = 146; Dmin = 0.0 km; Rmss = 0.41 seconds; Gp = 28° Version = 3
Event ID	nc 73948665 ***This event has been revised.

(1) Nominal Standard Time; local and daylight savings time zone may differ.
For updates, maps, and technical information
see: Event Page or USGS Earthquake Hazards Program
CISN Northern California Management Center
U.S. Geological Survey
Berkeley Seismological Laboratory
http://www.cisn.org/ncmc.html

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