Publication Date:
2020-02-24
Description:
Etna volcano is affected by a downward sliding of its eastern flank, as rapid as a few cm/year, whose nature is
highly debated. Recently collected marine geological and geophysical data allows a detailed image of the
morphostructural setting of the continental margin facing the volcano. Here, a large bulge offsets the margin
that is deeply affected by widespread semicircular steps, interpreted as evidence of large-scale gravitational
instability. Such features permeate the whole margin and extend inshore to the volcano sector where the
larger ground deformations are measured. Both submarine instability and subaerial flank sliding are bounded
by two regional tectonic lineaments interpreted as weakness lines. These cross the coastline to accommodate
the basinward movement of this large sector of the continental margin topped by the Etna volcanic pile. The
new data allows re-interpreting the tectonic setting of the coastal belt and proposing a novel structural model,
highlighting the active role of the continental margin instability to drive the seaward sliding of the volcano's
eastern flank. This model may suggest why a very active basaltic volcano has so unusually developed in front
of an active thrust belt.
Description:
Published
Description:
57–64
Description:
JCR Journal
Description:
restricted
Keywords:
volcano sliding
;
04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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