== PRELIMINARY EVENT 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.

An event occurred at 2:57:47 PM (PDT) on Friday, May 3, 2013.
The magnitude 1.3 event (a probable quarry explosion) occurred 0 km (0 miles) E (95 degrees) of Quarry near Cupertino, CA .
The hypocentral depth is 0 km (0.0 miles).

Magnitude		1.3 - duration magnitude (Md)
Time		Friday, May 3, 2013 at 2:57:47 PM (PDT) Friday, May 3, 2013 at 21:57:47 (UTC)
Distance from		Quarry near Cupertino, CA (a probable quarry explosion) - 0 km (0 miles) E (95 degrees) Cupertino, CA - 6 km (4 miles) W (273 degrees) Los Altos, CA - 7 km (4 miles) S (170 degrees) Mountain View, CA - 7 km (4 miles) SSW (193 degrees)
Coordinates		37 deg. 19.6 min. N (37.327N), 122 deg. 6.0 min. W (122.100W)
Depth		0 km (0.0 miles)
Quality		Good
Location Quality Parameters		Nst= 19, Nph= 19, Dmin=1 km, Rmss=0.09 sec, Erho=0.2 km, Erzz=31.6 km, Gp=79.2 degrees
Event ID#		nc71984981
Additional Information		map || waveforms
		Waveforms

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