Use of CVO Material

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Global Positioning System (GPS) receiver at Cotopaxi Volcano, Ecuador. GPS uses data transmitted by orbiting satellites to locate points on the ground. The USGS has made baseline GPS measurements at several volcanoes in the United States and in Latin America. In the event of an awakening of one of these volcanoes, GPS receivers would be set up at these points again to determine whether or not measurable deformation had occurred and to monitor for precursory deformation that might herald an eruption.
-- USGS Photo by J.W. Ewert

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Global Positioning System (GPS) setup, Mears, Oregon.
-- USGS Photo by Ken Yamashita, 1997

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White Lake GPS monument.
-- USGS Photo by D. Dzurisin, September 1999

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White Lake instrument enclosure, including Trimble 4000SSi receiver, FreeWave radio modem, timer to turn modem on and off once/day, and lightning protection.
-- USGS Photo by D. Dzurisin, September 1999

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White Lake solar panel tower and battery enclosure (partly buried culvert section, lower left).
-- USGS Photo by D. Dzurisin, September 1999

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White Lake communications antenna mounted in tree to reduce visual impact.
-- USGS Photo by D. Dzurisin, September 1999

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Hayden Valley GPS monument.
-- USGS Photo by D. Dzurisin, September 1999

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Hayden Valley instrument enclosure, solar panels, communications antenna, and battery enclosure. Monument is barely visible in the distance, near bottom of channel midway between worker and instrument enclosure (shoulder level, directly behind partly buried battery enclosure).
-- USGS Photo by D. Dzurisin, September 1999

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Use of CVO Material