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Map with beachball indicating near vertical fault plane oriented ~ N 47 E earthquake.

PBO GPS Stations 'Capture' Magnitude 6.5 Earthquake, Northern California Jan 9, 2010

February 19, 2010

On Jan 9, 2010, a Magnitude (M) 6.5 earthquake occurred offshore of Northern California ~ 30 miles WSW of Eureka, CA (Figure 1). As reported by the USGS, the event occurred within the Gorda Plate on a near vertical fault plane oriented ~ N 47 E. This region of the Gorda Plate is subjected to intense compressive stresses by oblique-convergence of the northwestward migrating Pacific Plate. The resulting internal deformation of the Gorda Plate is manifested primarily by intraplate strike-slip events on vertical NE-oriented faults. Strike-slip motion of the NE-oriented Gorda plate faults is left-lateral, antithetic to the right-lateral NW-oriented faults of the San Andreas fault system.
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Modified: Friday March 12, 2010     
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