MAPPING HYDROTHERMALLY ALTERED ROCKS ON MOUNT-RAINIER, WASHINGTON, WITH AIRBORNE VISIBLE INFRARED IMAGING SPECTROMETER (AVIRIS) DATA/

Mount Rainier has produced numerous Holocene debris flows, the largest of which contain clays and other minerals derived from hydrothermally altered rocks on the volcano's edifice. Imagery from an advanced airb orne sensor mas used to map altered rocks at Mount Rainier and demonst rates their distinctly nonuniform distribution. The mapping of altered rocks helps to identify edifice failure surfaces and to recognize the source areas for the largest debris flow events. Remote sensing metho ds like those used at Mount Rainier can enhance ground-based mapping e fforts and should prove useful for rapidly identifying hazardous secto rs at other volcanoes.