Submarine portions of volcanic islands are several times (up to an order of magnitude) larger than subaerial ones but very poorly known. Their knowledge about them is essential for the reconstruction of eruptive history and volcano-tectonic evolution, which are more difficult to be fully witnessed on-land. The offshore investigation of a number of Italian volcanic islands led to the identification of key outcomes, such as the widespread occurrence of mass-wasting features ranging across different scales and occurrence frequency. Large-scale features (i.e. debris avalanche deposits) occur both at Stromboli and Ischia islands, whereas morphologies and deposits related to minor slides and density flows (e.g. debris flows, grain flows, and turbidity flows) are very common in all the study areas. Moreover, several primary volcanic features have been identified, such as volcanic cones, eruptive fissures and lava fields. The results highlight the complex evolution of volcanic edifices, through the alternation of constructive phases, due to magma emission, and destructive processes, with mass wasting at different scales, including flank collapse. Thus, the achieved scientific results also provide a relevant contribution to the instability hazard assessment.

Volcanic Islands: the Tips of Large Submerged Volcanoes that only Marine Geology May Reveal (Examples from W-Pontine Archipelago, Ischia, Stromboli and Pantelleria).

ROMAGNOLI, CLAUDIA;
2011

Abstract

Submarine portions of volcanic islands are several times (up to an order of magnitude) larger than subaerial ones but very poorly known. Their knowledge about them is essential for the reconstruction of eruptive history and volcano-tectonic evolution, which are more difficult to be fully witnessed on-land. The offshore investigation of a number of Italian volcanic islands led to the identification of key outcomes, such as the widespread occurrence of mass-wasting features ranging across different scales and occurrence frequency. Large-scale features (i.e. debris avalanche deposits) occur both at Stromboli and Ischia islands, whereas morphologies and deposits related to minor slides and density flows (e.g. debris flows, grain flows, and turbidity flows) are very common in all the study areas. Moreover, several primary volcanic features have been identified, such as volcanic cones, eruptive fissures and lava fields. The results highlight the complex evolution of volcanic edifices, through the alternation of constructive phases, due to magma emission, and destructive processes, with mass wasting at different scales, including flank collapse. Thus, the achieved scientific results also provide a relevant contribution to the instability hazard assessment.
Marine Research @ CNR
435
446
DTA
A. Bosman; M. Calarco; D. Casalbore; A.M. Conte; E. Martorelli; A. Sposato; F. Falese; L. Macelloni; C. Romagnoli; F.L. Chiocci.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/108434
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