Several thousand years ago according to Dr. Richard Schweickert, a retired professor of geology at the University of Nevada, Reno who has spent most of his career working in the Sierra Nevada, Tahoe had a tsunami.
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It is unknown what lives at the bottom of Lake Tahoe.So far, their discoveries include a diamond ring, possible ship wreckage, and over 25,000 pounds of trash. However, Fallen Leaf Lake, about one-mile southwest of Tahoe, contains an ancient underwater forest with 80-foot tall trees from 2,000 years ago.
These faults are among the most significant seismic sources in the region and have their most active portions in the lake. In addition to ground shaking and surface ruptures from earthquakes, the exceptional depth of Lake Tahoe creates the additional hazard of tsunamis.