Publication Date:
2021-07-14
Description:
Hydrothermal alteration may weaken volcanic rocks, causing the gravitational instability of portions of active volcanoes with potentially hazardous collapses. Here we
show high‐resolution multibeam, magnetic and gravity surveys of the Marsili seamount, the largest active volcano of Europe located in the southern Tyrrhenian back‐arc basin. These surveys reveal zones with exceptionally low densities and with vanishing magnetizations, due probably
to the comminution of basalts during hyaloclastic submarine eruptions and to their post‐eruptive hydrothermal alteration.
The location of these regions correlates with morphological data showing the occurrence of past collapses. Similar
evidence has been obtained from pre existing data at Vavilov Seamount, another older volcanic system in the Tyrrhenian back‐arc basin. Here a large volume of at least
50 km3 may have collapsed in a single event from its 40 km long western flank. Given the similarities between these volcanoes, a large collapse event may also be expected at
Marsili.
Description:
Published
Description:
L03305
Description:
2.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attive
Description:
3.4. Geomagnetismo
Description:
JCR Journal
Description:
reserved
Keywords:
Marsili Seamount
;
Gravity anomalies
;
Magnetic anomalies
;
Tyrrhenian Sea
;
04. Solid Earth::04.02. Exploration geophysics::04.02.02. Gravity methods
;
04. Solid Earth::04.04. Geology::04.04.04. Marine geology
;
04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies
;
04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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