Low-frequency seismic signals recorded by OBS at Stromboli volcano (Southern Tyrrhenian Sea)

Details Low-frequency seismic signals recorded by OBS at Stromboli volcano (Southern Tyrrhenian Sea) Low-frequency seismic signals recorded by OBS at Stromboli volcano (Southern Tyrrhenian Sea)

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3604305s&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 4, CiteID L04305

Physics

Geophysics

Seismology: Volcano Seismology (8419), Volcanology: Volcano Monitoring (7280), Mathematical Geophysics: Spectral Analysis (3205, 3280), Marine Geology And Geophysics: Ocean Observatories And Experiments

Scientific paper

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.

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