Publication Date:
2017-04-04
Description:
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.
Description:
Published
Description:
L04305
Description:
3.6. Fisica del vulcanismo
Description:
JCR Journal
Description:
reserved
Keywords:
Volcano-seismology
;
low-frequency events
;
tremor
;
OBSs
;
Stromboli (Southern Tyrrhenian Sea)
;
04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
;
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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