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Abstract A small explosive eruption at Masaya volcano on 23 April 2001, in which a number of people were injured, was preceded by a distinct change in plume gas compositions. Open-path Fourier transform infrared spectroscopy (FTS) measurements show that the SO 2 /HCl molar ratio increased from 1.8 to 4.6 between April 2000 and April/May 2001. The SO 2 flux decreased from 11 to 4 kg s −1 over this period. We interpret these changes to be the result of scrubbing of water-soluble magmatic gases by a rejuvenated hydrothermal system. A sequence of M 5 earthquakes with epicentres about 7 km from the volcano occurred in July 2000. These may have altered the fracture permeability close to the magmatic conduit, and caused increased magmatic–hydrothermal interaction, leading eventually to the phreatic explosion in 2001. Continuous FTS measurements at suitable volcanoes could provide useful information in support of eruption prediction and forecasting.
stromboli-volcano, plume, volcano monitoring, emission rates, so2, galeras volcano, fourier transform infrared spectroscopy, flux, sulfur, transform infrared-spectroscopy, masaya, monitoring/, volcanic gas, solar occultation spectroscopy
stromboli-volcano, plume, volcano monitoring, emission rates, so2, galeras volcano, fourier transform infrared spectroscopy, flux, sulfur, transform infrared-spectroscopy, masaya, monitoring/, volcanic gas, solar occultation spectroscopy
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 91 | |
popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Top 10% | |
influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 10% | |
impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Top 10% |