Five hundred km of continuous magnetic profiles obtained on the surface of Lake Tahoe, California-Nevada, together with magnetic data on lake-bottom sediment samples and selected samples from nearby volcanic rocks, show that the Lake Tahoe basin is consistent with a fault-produced graben and that volcanic activity is confined along normal faults on the margins of the basin. A thick sequence of volcanic flows and numerous plugs north of the lake may be responsible for the northern closure of the Lake Tahoe basin, although we cannot preclude the presence of a granitic basement high in this area. Lake-bottom mounds are believed to be depositional or fault controlled. A large anomaly in the southern half of the lake is probably caused by a basement high.

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