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Authors: Sgroi, T.*
Montuori, C.*
Agrusta, R.*
Favali, P.*
Title: Low-frequency seismic signals recorded by OBS at Stromboli volcano (Southern Tyrrhenian Sea)
Title of journal: Geophysical Research Letters
Series/Report no.: / 36 (2009)
Publisher: AGU
Issue Date: Feb-2009
DOI: 10.1029/2008GL036477
Keywords: Volcano-seismology
low-frequency events
Stromboli (Southern Tyrrhenian Sea)
Abstract: Five three-component broadband ocean bottom seismometers (OBSs) were deployed on the seafloor around the Aeolian Islands (Southern Tyrrhenian Sea). By comparing OBSs digital seismograms, we found a low-frequency seismicity recorded only at OBS05, the nearest seafloor station to Stromboli volcano. This seismicity appears in the form of a continuous seismic signal (tremor-like-signal) as well as a considerable number of shock-like events. We focused on recordings from OBS05 to verify their correlation with Stromboli volcanic activity. From the spectral analysis, we observed low-frequency events (LP events), superposed upon the continuous background noise (tremor). LP events and tremor, showing similar energy fluctuations and frequency content, appear to be produced by the same dynamic processes. We interpret this low-frequency seismicity as probably originating from a continuous uprising of gas bubbles from the deeper part of the Stromboli magmatic column. This could highlight the existence of a deeper source for low-frequency seismicity.
Appears in Collections:04.08.07. Instruments and techniques
04.06.08. Volcano seismology
04.08.06. Volcano monitoring
Papers Published / Papers in press

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