Geology and tectonics of the southwestern boundary of the unstable sector of Mt. Etna (Italy)
Por:
Groppelli G., Norini G.
Publicada:
1 nov 2011
Resumen:
The Etna volcano is known to be unstable and gradually moving downslope toward east and south. The study of the local geology and structure of these unstable flanks and of their boundaries is important to understand the evolution of the flank instability and the stress field driving the spreading of the edifice. In this paper we present the geological evolution of the lower south-western sector of Mount Etna base on a detailed field survey at 1:10,000 scale. This area located at the boundary of the unstable south-eastern flank of the volcano is affected by the active Ragalna Fault and by distinctive eruptive fissures (Monte Calvario formation, 18-15 ka). The Monte Calvario formation is made of viscous lavas often associated to breccia and autoclastic lava fades fed by a set of eruptive fissures NE SW oriented. Their emplacement occurred immediately before the Ellitico caldera collapse, marking a previously poorly constrained shift in the feeding system of the volcano. The orientation o
Filiaciones:
Groppelli G.:
Istituto per la Dinamica dei Processi Ambientali, CNR, Sezione di Milano, Via Mangiagalli 34, 20133 Milano, Italy
Norini G.:
Univ Nacl Autonoma Mexico, Computat Geodynam Lab, Ctr Geociencias, Queretaro 76230, Mexico
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