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MultiGAS monitoring instrument installed on the dome in Mount St. H...

Detailed Description

This volcanic-gas monitoring station installed at Mount St. Helens consists of weather monitoring equipment and sensors for measuring the concentrations of water vapor (H2O), carbon dioxide (CO2), sulfur dioxide (SO2), and hydrogen sulfide (H2S) in volcanic gas plumes. Inside the fiberglass hut is the gas-monitoring equipment, a radio to send data back to the Cascades Volcano Observatory, plus batteries and other hardware that allows the station to run on power provided by the exterior solar panels.