Infrasonic arrays are a powerful tool for volcanic monitoring and hazard assessment. Explosions were recorded at Stromboli using a small aperture array of 4 infrasonic stations, allowing precise vent location. The acoustic signals were delayed-and-summed, revealing the existence of two main groups of infrasonic waves. The NE crater produces short (<3 s) high amplitude (20-80 Pa) pressure waves while the SW crater produces small acoustic pressure (10-30 Pa) with long (5-15 s) coda. The two groups reflect different in explosive styles and similar spectral content, centered on 5-6 Hz. When stacked together, acoustic waveforms for each crater reveal the same pressure pulse, which indicates a common source process. We infer that the acoustic onset at both craters is generated by the burst of a large gas bubble while the acoustic coda is controlled by a sustained pressure release.

Array tracking of infrasonic sources at Stromboli volcano / M. Ripepe; E. Marchetti. - In: GEOPHYSICAL RESEARCH LETTERS. - ISSN 0094-8276. - STAMPA. - 29:(2002), pp. 33-1-33-4. [10.1029/2002GL015452]

Array tracking of infrasonic sources at Stromboli volcano

RIPEPE, MAURIZIO;MARCHETTI, EMANUELE
2002

Abstract

Infrasonic arrays are a powerful tool for volcanic monitoring and hazard assessment. Explosions were recorded at Stromboli using a small aperture array of 4 infrasonic stations, allowing precise vent location. The acoustic signals were delayed-and-summed, revealing the existence of two main groups of infrasonic waves. The NE crater produces short (<3 s) high amplitude (20-80 Pa) pressure waves while the SW crater produces small acoustic pressure (10-30 Pa) with long (5-15 s) coda. The two groups reflect different in explosive styles and similar spectral content, centered on 5-6 Hz. When stacked together, acoustic waveforms for each crater reveal the same pressure pulse, which indicates a common source process. We infer that the acoustic onset at both craters is generated by the burst of a large gas bubble while the acoustic coda is controlled by a sustained pressure release.
2002
29
33-1
33-4
M. Ripepe; E. Marchetti
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/348134
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