Volcano Hazards Program

U.S. Geological Survey
Open-File Report 2007-1223
Version 1.0

Digital Data for Volcano Hazards in the Crater Lake Region, Oregon

By S.P. Schilling, S. Doelger, C.R. Bacon, L.G. Mastin, K.E. Scott, and M. Nathenson

2008

Data to accompany U.S. Geological Survey Open-File Report 97-487


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[View of Crater Lake from the south rim of the caldera. The caldera formed 7,700 years ago by collapse of the volcano known as Mount Mazama during the largest explosive volcanic eruption in the past 400,000 years in the Cascades. The lava flows and volcanic deposits exposed in the caldera walls record the growth of Mount Mazama, which attained an elevation of roughly 12,000 feet before the caldera collapsed. The prominent cliff on the north rim of the caldera is Llao Rock, a lava flow that was erupted just 200 years before the caldera-forming eruption. The cinder cone and lava flows of Wizard Island were erupted within a few hundred years of formation of Crater Lake caldera. <i>(USGS photograph taken by David Wieprecht, Cascades Volcano Observatory.] View of Crater Lake from the south rim of the caldera. The caldera formed 7,700 years ago by collapse of the volcano known as Mount Mazama during the largest explosive volcanic eruption in the past 400,000 years in the Cascades. The lava flows and volcanic deposits exposed in the caldera walls record the growth of Mount Mazama, which attained an elevation of roughly 12,000 feet before the caldera collapsed. The prominent cliff on the north rim of the caldera is Llao Rock, a lava flow that was erupted just 200 years before the caldera-forming eruption. The cinder cone and lava flows of Wizard Island were erupted within a few hundred years of formation of Crater Lake caldera. (USGS photograph taken by David Wieprecht, Cascades Volcano Observatory.)
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