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August 16, 2010
6:13 a.m.
EUREKA, Calif. --
Did you feel it?
A magnitude 4.5 earthquake centered in the Pacific Ocean west of Eureka hit this morning at around 5:05 a.m.
The U.S. Geological Survey preliminary computer generated report shows the epicenter 54 miles west of Eureka, which is 270 miles north of San Francisco in Humboldt County.
Magnitude | 4.5 |
---|---|
Date-Time |
|
Location | 40.759°N, 125.190°W |
Depth | 7.4 km (4.6 miles) (poorly constrained) |
Region | OFFSHORE NORTHERN CALIFORNIA |
Distances | 85 km (55 miles) W of Eureka, California 90 km (55 miles) WNW of Fortuna, California 140 km (85 miles) SW of Crescent City, California 400 km (250 miles) NW of SACRAMENTO, California |
Location Uncertainty | horizontal +/- 1.2 km (0.7 miles); depth +/- 29 km (18.0 miles) |
Parameters | Nph=154, Dmin=79 km, Rmss=0.34 sec, Gp=227°, M-type=regional moment magnitude (Mw), Version=4 |
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