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A multidisciplinary study of an active fault crossing urban areas: The Trecastagni Fault at Mt. Etna (Italy)
Author(s)
Language
English
Obiettivo Specifico
1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attive
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
/251(2013)
ISSN
0377-0273
Electronic ISSN
1872-6097
Publisher
Elsevier Science Limited
Pages (printed)
41-49
Issued date
2013
Keywords
Abstract
The Trecastagni Fault is a NNW–SSE tectonic structure in the densely inhabited southern flank of Mt. Etna,
characterised by evident morphological scarps and movements of normal and right-lateral type that directly affect
roads and buildings. The fault is affected by continuous dynamics with intermittent accelerations accompanied
with shallow seismicity. It has an important role in the instability affecting Mt. Etna's south-eastern flank
and represents part of the southern boundary of the unstable sector. The motion of the fault between 2005
and 2011 has been analysed by using a multi-disciplinary approach involving terrestrial and satellite ground deformation
data. Active monitoring systems able to investigate the fault in detail are extensometers, a levelling
network and InSAR. Two episodes of acceleration were recorded at the end of 2009 and during 2010. Data evidences
that the acceleration episodes affected only portions of the fault and that stress may accumulate and
be periodically released. Although bothmagmatic processes (inflation or intrusive episodes) and flank dynamics
influence the occurrence of the TF acceleration episodes, the dragging effect of the overall seaward sliding of the
south-eastern flank is evident and it causes the subsidence of the hangingwall, accumulating stress on the fault
that is periodically seismically released.
characterised by evident morphological scarps and movements of normal and right-lateral type that directly affect
roads and buildings. The fault is affected by continuous dynamics with intermittent accelerations accompanied
with shallow seismicity. It has an important role in the instability affecting Mt. Etna's south-eastern flank
and represents part of the southern boundary of the unstable sector. The motion of the fault between 2005
and 2011 has been analysed by using a multi-disciplinary approach involving terrestrial and satellite ground deformation
data. Active monitoring systems able to investigate the fault in detail are extensometers, a levelling
network and InSAR. Two episodes of acceleration were recorded at the end of 2009 and during 2010. Data evidences
that the acceleration episodes affected only portions of the fault and that stress may accumulate and
be periodically released. Although bothmagmatic processes (inflation or intrusive episodes) and flank dynamics
influence the occurrence of the TF acceleration episodes, the dragging effect of the overall seaward sliding of the
south-eastern flank is evident and it causes the subsidence of the hangingwall, accumulating stress on the fault
that is periodically seismically released.
Type
article
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