Abstract
Volcanic gases provide important insights into deep-Earth processes, and gas composition and flux variations show promise as predictors of eruptive activity1,2,3. But data correlating gas composition with eruptions are sparse, largely because such studies have traditionally involved direct sampling inside a volcanic crater — a hazardous operation that has resulted in numerous deaths4,5. Crater-rim-based spectroscopy6,7,8,9, closed-path spectroscopy of gases sampled from aircraft10, and time-averaged studies using volatile traps11,12,13 allow measurements to be taken from safer distances. But when a full-scale explosive eruption threatens, even these methods become dangerous as the hazard radius expands to many kilometres. Previously, only sulphur dioxide has been reliably measurable at such large distances, using correlation spectroscopy14. Here we describe techniques that extend the useful range of passive infrared spectroscopy to monitor many gases at distances of over 17 km. We demonstrate the use of these techniques in a high-temporal-resolution study of short-term compositional variations associated with an explosive eruption at Mexico's Popocatépetl volcano on 25–26 February 1997. We observed a steady increase in SiF4/SO2 over several days preceding the eruption, followed by a tenfold decrease in this ratio over a few hours immediately afterwards.
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Acknowledgements
We thank R. Meli for access and logistical support, and P. G. Weber, S. Gerstl and D.Pettit for discussions on remote sensing applications. This work was supported by Laboratory Directed Research and Development (LDRD) grants (Remote Sensing Science) from Los Alamos National Laboratory, and by the Mexican National Center for Disaster Prevention (CENAPRED), the Mexican National Science and Technology Commission (CONACYT), and the Universidad Nacional Autónoma de México.
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Love, S., Goff, F., Counce, D. et al. Passive infrared spectroscopy of the eruption plume at Popocatépetl volcano, Mexico. Nature 396, 563–567 (1998). https://doi.org/10.1038/25109
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DOI: https://doi.org/10.1038/25109
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