Epicenters of small-magnitude earthquakes, occurring in the central Aleution region during the 1964 Aleutian Experiment, were located by an S minus P method. Shallow earthquakes, occurring mainly just south of the islands, seem to delineate a shallow earthquake belt approximately 20 to 40 km wide. Deeper earthquakes occurred north of the shallow earthquake belt, and they seem to indicate a zone of faulting which dips toward the island arc from the oceanic side of the arc.

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