An Alaska Volcano Observatory geologist uses a laser-surveying instrument to measure distances to targets installed on the flanks of Redoubt Volcano. Minute changes in distances to the targets can reflect ground deformation that may indicate magma movement. Steam rises above a lava dome in the crater of Redoubt in this photo taken on May 5, 1990, near the end of an eruption that had begun the previous December.
Type/Process: Volcano Monitoring
Volcanic Status: Historical
Image Number: 052-066
Photographer: Robert McGimsey (U.S. Geological Survey)
Summit Elevation: 3108 meters
Latitude/Longitude: 60.485 N / 152.742 W
Timeframe: Last known eruption 1964 or later