Bathymetric analysis of hydrographic data taken in the region of Adak Canyon on the southern slope of the Aleutian Ridge off Alaska indicates that the canyon is a distinct and important boundary between an essentially regular, convex slope to the east and a topographically chaotic slope to the west. The unusually sheer east wall of the canyon appears to be the scarp of a major fault trending normal to the southern slope of the Aleutian Ridge. The canyon also separates an area of relatively high seismic activity to the west from an area of apparent stability to the east. These features suggest that the canyon is a major boundary feature between dissimilar geological units.

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