== PRELIMINARY EVENT REPORT ==

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

Version #5: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.

An event occurred at 2:29:15 PM (PDT) on Friday, May 3, 2013.
The magnitude 1.8 event (a probable quarry explosion) occurred 0 km (0 miles) E of Quarry near Mountain Gate (Shasta Res.), CA .
The hypocentral depth is 0 km (0.0 miles).

Magnitude		1.8 - duration magnitude (Md)
Time		Friday, May 3, 2013 at 2:29:15 PM (PDT) Friday, May 3, 2013 at 21:29:15 (UTC)
Distance from		Quarry near Mountain Gate (Shasta Res.), CA (a probable quarry explosion) - 0 km (0 miles) E (100 degrees) Redding, CA - 19 km (12 miles) NNE (20 degrees) Anderson, CA - 34 km (21 miles) N (358 degrees) Cottonwood, CA - 41 km (25 miles) N (356 degrees)
Coordinates		40 deg. 45.0 min. N (40.749N), 122 deg. 18.8 min. W (122.313W)
Depth		0 km (0.0 miles)
Quality		Fair
Location Quality Parameters		Nst= 25, Nph= 25, Dmin=20 km, Rmss=0.08 sec, Erho=0.2 km, Erzz=31.6 km, Gp=64.8 degrees
Event ID#		nc71984966
Additional Information		map || waveforms
		Waveforms NCSS First Motion Mechanism 1

For more information, see http://quake.wr.usgs.gov/

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