Similarities in Eruption Dynamics: A Seismo-Acoustic Analysis of Explosion Sequences at Tungurahua Volcano in May-July 2010 & December 2012

Abstract:

We analyze a continuous seismo-acoustic dataset of explosions at Tungurahua volcano, Ecuador, from July 2006 to the present. Reduced amplitudes and energies are calculated for discrete events using four collocated broadband seismic and infrasound sensors. Of the 19 explosive episodes identified, we highlight eruptive activity in May-July 2010 and December 2012 because of their similar characteristics and temporal evolution. During both periods of unrest, the following sequence is observed: Stage 1-Activity commences after more than 3 months of quiescence. Stage 2-Inflation and increasing VTs lead to the initiation of one high-energy explosion. Stage 3-After approximately 48 hours of relative repose, a few high-energy explosions are followed by strong tremor, column generation and pyroclastic flows. Stage 4-Hundreds of daily explosions are accompanied by chugging signals lasting about one week …

Año de publicación:

2014

Keywords:

Fuente:

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