Physics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3114607a&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 14, CiteID L14607
Physics
16
Atmospheric Composition And Structure: Volcanic Effects (8409), Volcanology: Atmospheric Effects (0370), Volcanology: Eruption Mechanisms, Volcanology: Eruption Monitoring (7280), Volcanology: General Or Miscellaneous
Scientific paper
A major explosion occurred at Stromboli on April 5 2003, being the most powerful event over a period of exceptional eruptive activity lasting from December to July. Here, we describe results from a network of diffusive tubes set up on the Stromboli's summit area, aimed at a characterisation of plume composition (SO2, HCl, HF) prior to and after April 5. Data analysis revealed anomalous sulphur degassing 2-3 days before the event, when SO2/HCl ratios (~9) significantly higher than those typical of quiescent degassing (~1) were recorded. We interpret this exceptional plume signature as an evidence of S-rich magmas ascending in the shallow plumbing system, and propose high SO2/HCl as a potential precursor of major explosions on the volcano. The post-April 5 phase was characterised by time-decreasing SO2/HCl and SO2/HF plume ratios, ascribed to declining magma feeding as a prelude to restoration of ``normal'' Strombolian activity.
Aiuppa Alessandro
Federico Cinzia
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