U.S. Geological Survey
David A. Johnston Cascades Volcano Observatory Vancouver, Washington U.S. Geological Survey Plans Field Investigations in Three Sisters Region, Oregon Scientists from U.S. Geological Survey's Cascades Volcano Observatory and Central Washington University, in cooperation with staff from the Willamette and Deschutes National Forests, will make surveys of ground deformation and gas emissions in the Three Sisters region of the central Oregon Cascade Range during the week of September 17, 2001. The work is part of an ongoing USGS program to track activity in the broad area of crustal uplift detected by satellite techniques last spring. Scientists interpret the slight ground uplift and weak gas emissions in the area as evidence that a small amount of magma, or molten rock, may have been intruded deeply under the area. For more information, see: http://vulcan.wr.usgs.gov/Volcanoes/Sisters/WestUplift/. The purpose of the upcoming work is twofold.
Information contact:
U.S. Geological Survey, Cascades Volcano Observatory, Vancouver, Washington
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