Infrasonic component of volcano-seismic eruption tremor

TitleInfrasonic component of volcano-seismic eruption tremor
Publication TypeJournal Article
Year of Publication2014
AuthorsMatoza RS, Fee D
JournalGeophysical Research Letters
Date Published2014/03
Type of ArticleArticle
ISBN Number0094-8276
Accession NumberWOS:000334264900021
Keywordsair-ground coupling; Alaska; array; constraints; eruption tremor; explosive activity; infrasound; propagation; seismo-acoustic; shishaldin volcano; waves

Air-ground and ground-air elastic wave coupling are key processes in the rapidly developing field of seismoacoustics and are particularly relevant for volcanoes. During a sustained explosive volcanic eruption, it is typical to record a sustained broadband signal on seismometers, termed eruption tremor. Eruption tremor is usually attributed to a subsurface seismic source process, such as the upward migration of magma and gases through the shallow conduit and vent. However, it is now known that sustained explosive volcanic eruptions also generate powerful tremor signals in the atmosphere, termed infrasonic tremor. We investigate infrasonic tremor coupling down into the ground and its contribution to the observed seismic tremor. Our methodology builds on that proposed by Ichihara et al. (2012) and involves cross-correlation, coherence, and cross-phase spectra between waveforms from nearly collocated seismic and infrasonic sensors; we apply it to datasets from Mount St. Helens, Tungurahua, and Redoubt Volcanoes.

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