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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
Title of 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
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.
Appears in Collections:04.03.99. General or miscellaneous
04.03.01. Crustal deformations
04.03.06. Measurements and monitoring
04.03.07. Satellite geodesy
04.03.09. Instruments and techniques
04.04.99. General or miscellaneous
04.04.06. Rheology, friction, and structure of fault zones
04.04.09. Structural geology
04.07.99. General or miscellaneous
04.07.02. Geodynamics
04.07.05. Stress
04.07.07. Tectonics
04.08.99. General or miscellaneous
04.08.06. Volcano monitoring
04.08.07. Instruments and techniques
04.08.08. Volcanic risk
05.08.99. General or miscellaneous
Papers Published / Papers in press

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