The July 14 earthquake and the July 26 earthquake was caused by the subduction of the Solomon Sea Plate beneath the Pacific Plate and the Bismark Sea Plate, respectively.
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There are depositions of sea floor deposits from the Cretaceous age, as well as Franciscan Complex, a medley of rock scraped off the oceanic crust as the Pacific Plate subducts beneath the North American Plate.
The Farallon Plate has almost completely subducted beneath the western portion of the North American Plate leaving that part of the North American Plate in contact with the Pacific Plate as the San Andreas Fault.
The Transverse Ranges represent a complex of tectonic forces and faulting stemming from the interaction of the Pacific Plate and the North American Plate along the San Andreas Fault system.
Tectonic activity along the North Coast of British Columbia and Southeast Alaska is characterized by transform movements of the Queen Charlotte Fault, a plate boundary where the Pacific Plate skids by the North American Plate.