A 7100-foot seismic refraction profile run across the floor of a former lake basin in south-central Oregon reveals fault blocks beneath the lake sediments. Data were interpreted by a wavefront solution. The reversed profile crosses four faults whose spacing, dips, and vertical displacements conform remarkably to observations of exposed faults elsewhere in the region. The seismic interpretation indicates that the faults are very steep with vertical slip ranging from 200 to about 800 feet.

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