[Geology2] M4.8 EQ (Revised From M5.2) Portola, CA, Area

Magnitude 4.8 - NORTHERN CALIFORNIA

2011 October 27 06:37:09 UTC

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Earthquake Details

• This event has been reviewed by a seismologist.

Magnitude	4.8
Date-Time	Thursday, October 27, 2011 at 06:37:09 UTC Wednesday, October 26, 2011 at 11:37:09 PM at epicenter
Location	39.605°N, 120.470°W
Depth	13.7 km (8.5 miles)
Region	NORTHERN CALIFORNIA
Distances	15 km (9 miles) SSE (153°) from Whitehawk, CA 17 km (11 miles) SSE (151°) from Valley Ranch, CA 18 km (11 miles) SSE (151°) from Clio, CA 37 km (23 miles) NW (322°) from Truckee, CA 56 km (35 miles) W (279°) from Reno, NV 145 km (90 miles) NE (36°) from Sacramento, CA
Location Uncertainty	horizontal +/- 0.3 km (0.2 miles); depth +/- 0.6 km (0.4 miles)
Parameters	Nph= 20, Dmin=2 km, Rmss=0.08 sec, Gp= 79°, M-type=regional moment magnitude (Mw), Version=5
Source	California Integrated Seismic Net: USGS Caltech CGS UCB UCSD UNR
Event ID	nc71671056

Source: http://earthquake.usgs.gov/earthquakes/recenteqsus/Quakes/nc71671056.html

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