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http://hdl.handle.net/2122/338
Authors: | Aiuppa, A.* Federico, C.* |
Title: | Anomalous magmatic degassing prior to the 5th April 2003 paroxysm on Stromboli | Journal: | Geophysical Research Letters | Series/Report no.: | 31 (2004) | Publisher: | American Geophysical Union | Issue Date: | 2004 | DOI: | doi:10.1029/2004GL020458 | URL: | http://www.agu.org/ | Keywords: | magmatic degassing paroxysm Stromboli |
Subject Classification: | 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring 04. Solid Earth::04.08. Volcanology::04.08.01. Gases 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions |
Abstract: | 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. |
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