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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5108

Authors: Acocella, V.*
Neri, M.*
Title: Dike propagation in volcanic edifices: Overview and possible developments
Title of journal: Tectonophysics
Series/Report no.: /471 (2009)
Publisher: Elsevier
Issue Date: Jun-2009
DOI: 10.1016/j.tecto.2008.10.002
URL: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V72-4TN0KSG-6&_user=5381242&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000067082&_version=1&_urlVersion=0&_userid=5381242&md5=c4f9d4a51c314bc9eca62294639f4294
Keywords: dikes
volcanoes
topography
tectonic setting
eruptions
Abstract: Eruptions are fed by dikes; therefore, better knowledge of dike propagation is necessary to improve our understanding of how magma is transferred and extruded at volcanoes. This study presents an overview of dike patterns and the factors controlling dike propagation within volcanic edifices. Largely based on published data, three main types of dikes (regional, circumferential and radial) are illustrated and discussed. Dike pattern data from 25 volcanic edifices in different settings are compared to derive semi-quantitative relationships between the topography (relief, shape, height, and presence of sector collapses) of the volcano, tectonic setting (presence of a regional stress field), and mean composition (SiO2 content). The overview demonstrates how dike propagation in a volcano is not a random process; rather, it depends from the following factors (listed in order of importance): the presence of relief, the shape of the edifice and regional tectonic control. We find that taller volcanoes develop longer radial dikes, whose (mainly lateral) propagation is independent of the composition of magma or the aspect ratio of the edifice. Future research, starting from these preliminary evaluations, should be devoted to identifying dike propagation paths and likely locations of vent formation at specific volcanoes, to better aid hazards assessment.
Appears in Collections:Papers Published / Papers in press
03.04.02. Carbon cycling
04.01.99. General or miscellaneous
04.04.99. General or miscellaneous
04.04.09. Structural geology
04.07.99. General or miscellaneous
04.07.05. Stress
04.07.07. Tectonics
04.08.99. General or miscellaneous
04.08.03. Magmas
04.08.06. Volcano monitoring
04.08.08. Volcanic risk
05.02.99. General or miscellaneous
05.02.03. Volcanic eruptions
05.08.99. General or miscellaneous

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