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Map of Northeastern Pacific Basin, showing relation of the San Andreas fault as one element in the complex boundary between the North American and Pacific plates — Northeastern Pacific Basin, showing relation of the San Andreas fault as one element in the complex boundary between the North American and Pacific plates. Modified from Drummond (1981).

Cross section of the SAFOD drill hole showing small target earthquakes (red dots) at 3-4 km depth. — Northeastern Pacific Basin, showing relation of the San Andreas fault as one element in the complex boundary between the North American and Pacific plates. Modified from Drummond (1981).