Abstract
New helicopter-borne electromagnetic and magnetic data, combined with detailed geologic mapping, reveal that appreciable thicknesses of mostly buried altered rock lie mainly in the upper west flank of Mount Rainier identifying this as the most likely source for future large debris flows capable of reaching now densely-populated areas. Most of the summit, central core and upper east side of the volcano are free of significant volumes of weak, highly-altered rock and are at relatively lower risk of collapse. In addition, the lack of highly altered rock lies in the volcano's core may impede collapse retrogression and limit volumes and inundation areas of future debris flows. High-resolution geophysical and geologic observations yield an unprecedented view of the 3-D distribution of collapse-prone altered rock at Mount Rainier, and have potential application to hazardous volcanoes worldwide.
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