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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2229

Authors: Aloisi, M.*
Bonaccorso, A.*
Gambino, S.*
Title: Imaging composite dike propagation (Etna, 2002 case)
Title of journal: Journal Geophysical Research
Series/Report no.: /111 (2006)
Publisher: AGU
Issue Date: 2006
DOI: 10.1029/2005JB003908
Keywords: NONE
Abstract: Late on the night of 26 October 2002, a dike intrusion started suddenly at Mount Etna, producing intense explosive activity and lava effusion on the southern flank. Five to six hours afterward, a long field of eruptive fractures propagated radially along the northeastern flank of the volcano, producing marked variations at the permanent tilt network. The dike propagation velocity was inferred by the associated seismicity. We modeled the temporal evolution of the continuously recorded tilt data, both during the vertical dike propagation on the high south flank on 26 October and during the radial propagation along the northeast flank, between 27 and 28 October. The reproduction of the recorded tilt signal allowed us to describe the geometry and characteristics of the two dikes in greater detail than the previous static inversion. We deduced that the eruption was characterized by an unusual composite mechanism, clearly showing a transition from a nearly pure opening mode displacement to a mechanism characterized by an equally strong normal dip-slip component and a smaller left lateral strike-slip component. In this study we demonstrate the interaction between the final segment of the dike and a preexisting structure that was reactivated in response to the intrusion. We show that tilt and its modeling represent a powerful tool to verify and constrain dike intrusions in detail.
Appears in Collections:Papers Published / Papers in press
04.03.08. Theory and Models
04.08.06. Volcano monitoring

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