Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5202
AuthorsCannata, A.* 
Montalto, P.* 
Privitera, E.* 
Russo, G.* 
TitleCharacterization and location of infrasonic sources in active volcanoes: Mount Etna, September–November 2007
Issue Date25-Aug-2009
Series/Report no./114 (2009)
DOI10.1029/2008JB006007
URIhttp://hdl.handle.net/2122/5202
KeywordsMt. Etna
Infrasound
volcano monitoring
Subject Classification04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology 
AbstractThe period September–November 2007 was characterized at Mount Etna by explosive activity and intense degassing. During this time interval, infrasonic signals were recorded by an infrasonic network. By a triggering procedure, about 1000 infrasonic events were found, characterized by very high signal-to-noise ratio and grouped into nine families. Successively, the spectral analysis allowed subdividing these nine families into three clusters based on the peak frequency and the quality factor of the events. Finally, by the location analysis a cluster (cluster 1) was related to the degassing activity of the northeast crater (NEC), while the other two (clusters 2 and 3) to the explosive activity of the southeast crater (SEC). The comparison between the stacked infrasonic waveforms, interpreted as generated by the vibration of large gas bubbles, and the synthetic ones, permitted to calculate radius, length of the bubble, and initial overpressure, by a genetic algorithm method. The higher overpressure values of cluster 3 compared to the cluster 2 values were in good agreement with the stronger intensity of the explosions accompanying the infrasonic events of cluster 3. The variation of both intensities and waveforms is tentatively attributed to the occasional accumulation of lithic clasts (due to moderate landslides?) on the explosive vent. Indeed, events belonging to cluster 3 were no longer observed once the landslides had ended. Finally, the daily emitted gas volume, related to the active degassing, was estimated for NEC and SEC by using the infrasonic data during the studied period.
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