Unmanned submarine to explore depths of Lake Tahoe

An unmanned submarine headed for Antarctica will first explore the depths of Lake Tahoe on Friday to study the blasted rocks of a seismic fault created thousands of years ago by a huge earthquake that ruptured the lake's floor.

Ross Seitz, an engineering geologist with the California Geological Survey and an expert on the lake's ancient quake history, will be using the tethered sub to gather underwater images of the West Tahoe fault, which last ruptured some 2,500 years ago with a magnitude of more than 7.

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