Publication Date:
2017-04-04
Description:
In the Sicily Channel, volcanic activity has been concentrated mainly on
the Pantelleria and Linosa islands, while minor submarine volcanism
took place in the Adventure, Graham and Nameless banks. The volcanic
activity spanned mostly during Plio-Pleistocene, however, historical submarine
eruptions occurred in 1831 on the Graham Bank and in 1891 offshore
Pantelleria Island. On the Graham Bank, 25 miles SW of Sciacca,
the 1831 eruption formed the short-lived Ferdinandea Island that represents
the only Italian volcano active in historical times currently almost
completely unknown and not yet monitored. Moreover, most of the Sicily
Channel seismicity is concentrated along a broad NS belt extending from
the Graham Bank to Lampedusa Island. In 2012, the Istituto Nazionale
di Geofisica e Vulcanologia (INGV) carried out a multidisciplinary
oceanographic cruise, named “Ferdinandea 2012”, the preliminary results
of which represent the aim of this paper. The cruise goal was the
mapping of the morpho-structural features of some submarine volcanic
centres located in the northwestern side of the Sicily Channel and the
temporary recording of their seismic and degassing activity. During the
cruise, three OBS/Hs (ocean bottom seismometer with hydrophone)
were deployed near the Graham, Nerita and Terribile submarine banks.
During the following 9 months they have recorded several seismo-acoustic
signals produced by both tectonic and volcanic sources. A high-resolution
bathymetric survey was achieved on the Graham Bank and on the surrounding
submarine volcanic centres. A widespread and voluminous gas
bubbles emission was observed by both multibeam sonar echoes and a
ROV (remotely operated vehicle) along the NW side of the Graham Bank,
where gas and seafloor samples were also collected.
Description:
Published
Description:
S0208
Description:
4V. Vulcani e ambiente
Description:
JCR Journal
Description:
open
Keywords:
Graham Bank,
;
Ferdinandea
;
Multibeam bathymetry
;
OBS
;
ROV
;
Underwater volcanism.
;
04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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