Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/8307
Authors: | Ruch, J.* Pepe, S.* Casu, F.* Acocella, V.* Neri, M.* Solaro, G.* Sansosti, E.* |
Title: | How do volcanic rift zones relate to flank instability? Evidence from collapsing rifts at Etna | Journal: | Geophysical Research Letters | Series/Report no.: | /39(2012) | Publisher: | American Geophysical Union | Issue Date: | 19-Sep-2012 | DOI: | 10.1029/2012GL053683 | Keywords: | flank instability rift zones |
Subject Classification: | 04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring 04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy 04. Solid Earth::04.03. Geodesy::04.03.09. Instruments and techniques 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous 04. Solid Earth::04.04. Geology::04.04.06. Rheology, friction, and structure of fault zones 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::04.07.02. Geodynamics 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::04.08.06. Volcano monitoring 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk 05. General::05.08. Risk::05.08.99. General or miscellaneous |
Abstract: | Volcanic rift zones, characterized by repeated dike emplacements, are expected to delimit the upper portion of unstable flanks at basaltic edifices. We use nearly two decades of InSAR observations excluding wintertime acquisitions, to analyze the relationships between rift zones, dike emplacement and flank instability at Etna. The results highlight a general eastward shift of the volcano summit, including the northeast and south rifts. This steadystate eastward movement (1-2 cm/yr) is interrupted or even reversed during transient dike injections. Detailed analysis of the northeast rift shows that only during phases of dike injection, as in 2002, does the rift transiently becomes the upper border of the unstable flank. The flank's steady-state eastward movement is inferred to result from the interplay between magmatic activity, asymmetric topographic unbuttressing, and east-dipping detachment geometry at its base. This study documents the first evidence of steady-state volcano rift instability interrupted by transient dike injection at basaltic edifices. |
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