Numerical model of the Stromboli volcano (Italy) including the effect of magma pressure in the dyke system |
| |
Authors: | T Apuani C Corazzato |
| |
Institution: | (1) Dipartimento di Scienze della Terra “A. Desio”, Università degli Studi di Milano, Milano, Italy;(2) Dipartimento di Scienze Geologiche e Geotecnologie, Università degli Studi di Milano-Bicocca, Milano, Italy |
| |
Abstract: | Summary The Stromboli island, in the Aeolian archipelago (Italy), is one of the most active volcanoes in Europe. In the last 13,000
years, its growth has been complicated by four sector collapses affecting the NW flank, the latest of which resulting in the
formation of Sciara del Fuoco (SdF) horseshoe-shaped depression. Slope instability phenomena are represented not only by giant
deep-seated gravitational slope deformations, but also by more frequent large landslides, such as occurred in December 2002–January
2003, and shallow landslides, involving loose or weakly cemented deposits, that constitute a natural hazard and affect residential
and tourists safety. It is noteworthy that in volcanic environment the instability factors are manifold and much more complex
than in other non-volcanic contexts. This paper deals with the Stromboli NW flank instability, and focuses on the effects
of magma pressure in the feeding system. Two main objectives have been pursued: (1) to test a methodological approach, in
order to evaluate a complex instability process; (2) to contribute to the understanding of volcano deformation and collapse
mechanisms and associated hazard. A numerical model was developed by the Finite Difference Method and the FLAC 4.0 code, considering
a cross-section of the entire volcano, orthogonal to the SdF and including both subaerial and submerged slopes. The stability
of the volcano was analysed under gravity alone, and by introducing the magma pressure effect, both related to magmastatic
and overpressure components. The results indicate that gravity alone is not sufficient to affect the stability of the volcano
slopes, nor is the magmastatic pressure component. If an excess magma pressure component is introduced, instability is produced
in accordance with field evidences and recent slope dynamics.
Correspondence: Tiziana Apuani, Dipartimento di Scienze della Terra “A. Desio”, via Mangiagalli 34, 20133 Milano, Italy |
| |
Keywords: | : Stromboli magma pressure stress analysis finite difference model |
本文献已被 SpringerLink 等数据库收录! |
|