Array tracking of infrasonic sources at Stromboli volcano

Details Array tracking of infrasonic sources at Stromboli volcano Array tracking of infrasonic sources at Stromboli volcano

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29v..33r&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 22, pp. 33-1, CiteID 2076, DOI 10.1029/2002GL015452

Physics

26

Seismology: Volcano Seismology (8419), Volcanology: Eruption Monitoring (7280), Volcanology: Instruments And Techniques

Scientific paper

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.

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