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

Alessandro Aiuppa, Cinzia Federico

Risultato della ricerca: Articlepeer review

44 Citazioni (Scopus)

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
Lingua originaleEnglish
pagine (da-a)1-4
Numero di pagine4
RivistaGeophysical Research Letters
Volume31
Stato di pubblicazionePublished - 2004

All Science Journal Classification (ASJC) codes

  • Geophysics
  • ???subjectarea.asjc.1900.1900???

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