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Seismic reflections reveal a massive melt layer feeding Campi Flegrei caldera
Zollo A. et al
Geophysical Research Letters 35 (2008) L12306 - http://hal-insu.archives-ouvertes.fr/insu-00354731
Aldo Zollo1, Nils Maercklin1, Maurizio Vassallo1, Dario Dello Iacono1, J. Virieux2, Paolo Gasparini1
1 :  Department of Physics
RISSC-Lab – Università di Napoli "Federico II"
Naples
Italie
2 :  LGIT - Laboratoire de géophysique interne et tectonophysique
http://www-lgit.obs.ujf-grenoble.fr/
CNRS : UMR5559 – Institut de recherche pour le développement [IRD] – LCPC – OSUG – INSU – Université de Savoie – Université Joseph Fourier - Grenoble I
Maison des Géosciences 1381 Rue de la piscine - BP 53 38041 GRENOBLE CEDEX 9
France
Seismic reflections reveal a massive melt layer feeding Campi Flegrei caldera
Campi Flegrei is an active, resurgent caldera that is located a few kilometres west of the city of Naples, a densely populated urban settlement in southern Italy. Identifying, locating at depth and better defining the geometry of the magma feeding system of the caldera is highly relevant for assessing and monitoring its volcanic hazard. Based on a high resolution seismic reflection data set, we investigated the deep structure of the volcano. Here we show that seismic wave amplitude variations with distance from the radiating source provide clear evidence for large amplitude seismic reflections from the top of an extended supercritical fluid-bearing rock formation at about 3,000 m and of an about 7,500 m deep, 1,000 m thick, low velocity layer, which is associated with a mid-crust, partial melting zone beneath the caldera. The modeling of magma properties based on measured seismic velocities indicates a relatively high melt percentage (in the range 80–90%). These new data suggest that a large magmatic sill is present well within the basement formations, which is possibly linked to the surface through a system of deep fractures bordering the caldera. The lateral extension and similar depth of the melt zone observed beneath the nearby Mt.Vesuvius support the hypothesis of a single continuous magma reservoir feeding both of these volcanoes.
Anglais
2008

10.1029/2008GL034242
Geophysical Research Letters
internationale
2008
35
L12306