Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4901
Authors: Acocella, V.* 
Neri, M.* 
Sulpizio, R.* 
Title: Dike propagation within active central volcanic edifices: constraints from Somma-Vesuvius, Etna and analogue models
Issue Date: 13-Feb-2009
Series/Report no.: 2/71 (2009)
DOI: 10.1007/s00445-008-0258-2
URI: http://hdl.handle.net/2122/4901
Keywords: Dike propagation
Central volcanic edifices
Stress
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.03. Mantle and Core dynamics 
04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous 
04. Solid Earth::04.04. Geology::04.04.09. Structural geology 
04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous 
04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress 
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics 
04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous 
04. Solid Earth::04.08. Volcanology::04.08.02. Experimental volcanism 
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk 
05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions 
05. General::05.08. Risk::05.08.99. General or miscellaneous 
Abstract: Dikes within stratovolcanoes are commonly expected to have radial patterns. However, other patterns may also be found, due to regional stresses, magmatic reservoirs and topographic variations. Here, we investigate dike patterns within volcanic edifices by studying dike and fissure complexes at Somma-Vesuvius and Etna (Italy) using analogue models. At the surface, the dikes and fissures show a radial configuration. At depths of tens to several hundreds of metres, in areas exposed by erosion, tangential and oblique dikes are also present. Analogue models indicate that dikes approaching the flanks of cones, regardless of their initial orientation, reorient to become radial (parallel to the maximum gravitational stress). This re-orientation is a significant process in shallow magma migration and may also control the emplacement of dikefed fissures reaching the lower slopes of the volcano.
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