Global Volcanism Program | Image GVP-03081

U.S. Geological Survey scientists monitor deformation on the Three Sisters volcanoes in the central Oregon Cascades, with Middle Sister volcano in the background. Precise leveling that permits detection of minor uplift is one of several monitoring techniques used to forecast eruptions. Photo by John Ewert, 1985 (U.S. Geological Survey).

U.S. Geological Survey scientists monitor deformation on the Three Sisters volcanoes in the central Oregon Cascades, with Middle Sister volcano in the background. Precise leveling that permits detection of minor uplift is one of several monitoring techniques used to forecast eruptions.

Photo by John Ewert, 1985 (U.S. Geological Survey).

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Galleries: Fieldwork | Volcano Monitoring

Keywords: volcano monitoring | deformation | stratovolcano | field work | volcanologist

Three Sisters