GEOLOGY

Detailed explanation-1: -These quakes at transform faults have a shallow focus. This is because the plates slide past each other without moving up or down. The San Andreas Fault that runs through much of California is an enormous transform plate boundary. It is the plate boundary between Pacific and North American plates.

Detailed explanation-2: -The San Andreas Fault and Queen Charlotte Fault are transform plate boundaries developing where the Pacific Plate moves northward past the North American Plate. The San Andreas Fault is just one of several faults that accommodate the transform motion between the Pacific and North American plates.

Detailed explanation-3: -The San Andreas fault is a transform plate boundary, accomodating horizontal relative motions. For more information on the story of plate tectonics see This Dynamic Earth.

Detailed explanation-4: -The Pacific Plate is being moved north west due to sea floor spreading from the East Pacific Rise (divergent margin) in the Gulf of California. The North American Plate is being pushed west and north west due to sea floor spreading from the Mid Atlantic Ridge (divergent margin).

Detailed explanation-5: -The San Andreas Fault is a continental right-lateral strike-slip transform fault that extends roughly 1, 200 kilometers (750 mi) through California. It forms the tectonic boundary between the Pacific Plate and the North American Plate.