On February 19 AVO geologists, Janet Schaefer AVO/ADGGS and Kristi Wallace AVO/USGS, conducted helicopter-supported field investigations of the ash that fell on Unalaska Island during the January 30-31 Bogoslof eruption. Wind and exposure to sunlight since the ash fall event has caused the ash to be encased in ice and the exposed ash now appears as gray areas on the hillside. Samples were collected at nine locations across the island. Only trace amounts of ash were found at all sites (trace = less than 1/32 of an inch or less than 0.8 mm). In this photo, Kristi Wallace samples a measured area section of ash fall.
Image courtesy of the AVO/ADGGS.
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