Publication Date:
2017-04-04
Description:
Aim of this paper is to identify variations in Very-Long-Period (VLP) source associated with eruptive style
changes at Stromboli volcano (Italy) and to retrieve information about the shallow plumbing system that
sustains the eruptive activity.
We have considered a dataset of 74493 VLP events recorded during the period from January through August
2007, when an effusive eruption occurred (February 27–April 2).We performed a polarization analysis of the
entire dataset and divided the considered period into four sub-periods on the basis of polarization
characteristics. We then located the events and selected a subset of these events by applying a location
quality threshold. The high quality locations demonstrate that during the effusive eruption the VLP sources
first moved downward and then moved southwestward.
To retrieve information about the geometry of the structures where the source processes take place, we
further consider a subset of events and estimate their source mechanisms by using a moment tensor source
function (MTSF) inversion technique. Inversion of the waveforms of the VLP events that occurred on
February 27 allows us to obtain information about the dynamics of different source centroids distributed
along different portions of the shallow magmatic conduits. The structure defined by the locations and source
mechanisms shows a greater complexity compared with previous studies and their time variations give an
insight into the kinematics of the eruption.
Description:
Published
Description:
162–171
Description:
1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
Description:
JCR Journal
Description:
reserved
Keywords:
stromboli
;
very-long-period events
;
seismic source mechanism
;
volcano seismology
;
04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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