(B) No, the anomalies don't parallel mapped faults or rock units. Anomalies are parallel to the flightline direction and are artifacts caused by slight differences in the height of the airplane above the land's surface or errors in the flightline locations.
(C) The magnetic rocks are closer to the surface in the Bay Area. The Central Valley is covered by thick non-magnetic sedimentary deposits.
(D) 13,000,000 years! About 120 years of movement.
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