Magnitude 5.3 Earthquake of OFFSHORE NORTHERN CALIFORNIA 2012 July 21

2012 July 21 06:04:21 UTC: OFFSHORE NORTHERN CALIFORNIA EARTHQUAKE

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Magnitude: 5.3

Date-Time: Saturday, July 21, 2012 at 06:04:21 UTC

Friday, July 20, 2012 at 11:04:21 PM at epicenter

seismic data:

Location : 40.430°N, 125.234°W

Depth : 0.6 km (~0.4 mile) (poorly constrained)
Region : OFFSHORE NORTHERN CALIFORNIA

Distances:

a)81 km (50 miles) W (279°) from Petrolia, CA

b)93 km (58 miles) WSW (249°) from Humboldt Hill, CA

c)99 km (62 miles) WSW (246°) from Eureka, CA

d)382 km (238 miles) NW (321°) from San Francisco City Hall, CA

Location Uncertainty:horizontal +/- 1.8 km (1.1 miles); depth +/- 13.6 km (8.5 miles)

Parameters: Nph=151, Dmin=76 km, Rmss=0.57 sec, Gp=230°,M-type=regional moment magnitude (Mw), Version=5