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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 | Journal: | Bulletin of Volcanology | Series/Report no.: | 2/71 (2009) | Publisher: | Springer-Verlag | Issue Date: | 13-Feb-2009 | DOI: | 10.1007/s00445-008-0258-2 | URL: | http://www.springerlink.com/content/2576m20802j13n0w/?p=bc87b786709c4c84b86915c313799611π=5 | Keywords: | Dike propagation Central volcanic edifices Stress |
Subject Classification: | 04. 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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