The ground near one of the long-dormant Three Sisters volcanoes in the Cascade Mountains of
west-central Oregon has risen approximately 10 centimeters in a 10-by-20-km parcel since 1996,
meaning that magma or underground lava is slowly flowing into the area, according to a research
team from the U.S. Geological Survey. The Three Sisters areawhich contains five volcanoesis only about 170 miles from Mount St. Helens, which erupted in 1980. Both are part of the
Cascades Range, a line of 27 volcanoes stretching from British Columbia in Canada to northern
California. This perspective view was created by draping a simulated natural color ASTER image
over digital topography from the U.S. Geological Survey National Elevation Dataset.