Publication Date:
2017-04-04
Description:
Seafloor instability resulting from both tectonics and volcanism
affects the Western Ionian Sea. The NEutrino Mediterranean Observatory-Submarine
Network 1 (NEMO-SN1), deployed 25 km offshore eastern Sicily at 2,100 m water
depth, records a variety of signals for geophysical and environmental long-term
monitoring, including non-earthquake seismic signals that provide insights into
the area’s geohazards. The signals analyzed for this paper are: (1) seismic signals
associated with submarine landslides, (2) volcanic tremor, and (3) short duration
events (SDEs). These seismic signals are analyzed together with pressure and
hydrophone data to help identify their origins. Tectonic shifts can lead to submarine
landslides. Volcanic tremor is the result of sustained pressure fluctuations, probably
related to stress variations induced by magma movement. Increased tremor
amplitudes recorded at NEMO-SN1 during lava fountain episodes from February to
April 2013 suggest the presence of an east-southeast offshore location of the roots of
Mt. Etna’s magma feeding system. SDEs are thought to result from hydrofracturing of
carbonate outcroppings at the base of the Malta Escarpment that is possibly induced
by changes in the stress field associated with magma movement.
Description:
Published
Description:
154–166
Description:
3A. Ambiente Marino
Description:
JCR Journal
Description:
restricted
Keywords:
Undersea natural hazards
;
Seafloor instability
;
tectonic and volcanism
;
multidisciplinary data
;
non-earthquake signals
;
Mt. Etna and Western Ionian sea
;
04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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