How do volcanic rift zones relate to flank instability? Evidence from collapsing rifts at Etna (Articolo in rivista)

Type
Label
  • How do volcanic rift zones relate to flank instability? Evidence from collapsing rifts at Etna (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1029/2012GL053683 (literal)
Alternative label
  • Ruch J 1; Pepe S 2; Casu F 2; Acocella V 1; Neri M 3; Solaro G 2; Sansosti E 2 (2012)
    How do volcanic rift zones relate to flank instability? Evidence from collapsing rifts at Etna
    in Geophysical research letters
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ruch J 1; Pepe S 2; Casu F 2; Acocella V 1; Neri M 3; Solaro G 2; Sansosti E 2 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 39 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1. Univ Roma Tre, Dipartimento Sci Geol, IT-00146 Rome, Italy; 2. CNR, Ist Rilevamento Elettromagnet Ambiente, Naples, Italy; 3. Sez Catania, Osservatorio Etneo, Ist Nazl Geofis & Vulcanol, Catania, Italy (literal)
Titolo
  • How do volcanic rift zones relate to flank instability? Evidence from collapsing rifts at Etna (literal)
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 steady-state 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. (literal)
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