USGS uses airborne tool to map Alaska permafrost

Associated Press: The agency announced Monday that an airborne survey in Alaska's Yukon River drainage had collected unprecedented images of the presence and absence of permafrost down to 328 feet. The study used an electromagnetic survey tool flown beneath a helicopter. "We really think we've got the story nailed down from these data," research geophysicist Burke Minsley said by phone from the Crustal Geophysics and Geochemistry Science Center in Denver. Minsley is lead author of the study published Friday......

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