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Geochemistry of volcanic gases, their use for eruption prediction, and their impact on the atmosphere; integration of geochemical, geological and geophysical datasets to model volcano plumbing systems; micro-analysis of trace volatile and light lithophile elements by ion microprobe, inductively-coupled plasma mass spectrometry laser, and electron microprobe studies; new infrared remote sensing techniques to measure gases at active volcanoes; new infrared remote sensing techniques to measure gases at active volcanoes; petrology and geochemistry of intermediate and felsic magmas; understanding physical processes and forecasting eruptions at active subduction-zone volcanoes.