13: Structure of the western basin of Lake Superior from cross structure refraction profiles

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Abstract
Crustal cross sections for three seismic refraction lines in western Lake Superior provide structural models of the upper 10 km of crust. These models substantiate the view of western Lake Superior as an asymmetric synclinal trough whose axis trends along the south shore of the lake. Travel-time offsets are used to confirm the westward extension of the Isle Royale Fault into the lake and to demonstrate the existence of a 30-km-wide fault-bounded basin in the center of western Lake Superior. Gravity models for the entire crust, which include structures deduced from seismic refraction data, clarify the positions of the high-density axial zone of the Midcontinent Rift System beneath western Lake Superior.

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