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 A, & FEDERICO C (2004). Anomalous magmatic degassing prior to the 5th April 2003 paroxysm on Stromboli. GEOPHYSICAL RESEARCH LETTERS, 31, 1-4.

Anomalous magmatic degassing prior to the 5th April 2003 paroxysm on Stromboli

AIUPPA, Alessandro;
2004

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
AIUPPA A, & FEDERICO C (2004). Anomalous magmatic degassing prior to the 5th April 2003 paroxysm on Stromboli. GEOPHYSICAL RESEARCH LETTERS, 31, 1-4.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/24581
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