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Judenherc, Sebastien
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Judenherc, Sebastien
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- PublicationOpen AccessCampi Flegrei active seismic experiments waveforms compilation(2006)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Capuano, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Zollo, A.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;Auger, E.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;Caielli, G.; Istituto per la Dinamica dei Processi Ambientali, CNR, Milano, Italy ;Chiarabba, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Convertito, V.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;D’Auria, L.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;De Franco, R.; Istituto per la Dinamica dei Processi Ambientali, CNR, Milano, Italy ;Emolo, A.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;Judenherc, S.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;Lovisa, L.; Istituto Nazionale di Oceanografia e Geofisica Sperimentale, Trieste, Italy ;Makris, J.; University of Hamburg, Hamburg, Germany ;Michelini, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Moretti, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Priolo, E.; Istituto Nazionale di Oceanografia e Geofisica Sperimentale, Trieste, Italy ;Russo, G.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;Virieux, J.; Géosciences Azur, CNRS, Université de Nice, Sophie Antinopolies, Valbonne, France; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; A new experiment called SERAPIS (SEismic Reflection/Refraction Acquisition Project for Imaging complex volcanic Structures) has been planned and carried out, based on off-shore seismic energization and data acquisition on land and on sea-bottom. The experiment was performed in September, 2001 during which the vessel NADIR of IFREMER (equipped with 12, 16-liters airgun) produced more than 5000 air gun shots recorded at a sea-bottom seismograph array of 72 OBS and 62 stations installed on-land. Active seismic refraction DSS (Deep Seismic Soundings) acquired during the surveys conducted in 1980 and 1985 were recovered jointly with seismic data acquired in the Campi Flegrei area in the framework of the MareVes97 (an experiment devoted to the definition of the structure of the Somma-Vesuvio complex) offshore survey. The data set acquired during the SERAPIS experiment has been successfully used to infer 3D images of the volcanic structures of Campi Flegrei and Neapolitan bay. Active seismic waveforms and related P-picks (more than 90000 data) from the SERAPIS experiment are also available in the project data server.359 277 - PublicationRestrictedSeismic images and rock properties of the very shallow structure of Campi Flegrei caldera (southern Italy)(2009-03)
; ; ; ; ; ;Dello Iacono, Dario; Dipartimento di Scienze Fisiche, Università di Napoli Federico II, Napoli, Italy ;Zollo, Aldo; Dipartimento di Scienze Fisiche, Università di Napoli Federico II, Napoli, Italy ;Vassallo, Maurizio; Dipartimento di Scienze Fisiche, Università di Napoli Federico II, Napoli, Italy ;Vanorio, Tiziana; Stanford Rock Physics Laboratory, Stanford University, Stanford, CA, USA ;Judenherc, Sebastien; Dipartimento di Scienze Fisiche, Università di Napoli Federico II, Napoli, Italy - Agecodagis, sarl, Rieux Volvestre, France; ; ; ; In September 2001, an extensive active-seismic investigation (Serapis experiment) was carried out in the Gulfs of Naples and Pozzuoli, with the aim of investigating and reconstructing the shallow crustal structure of the Campi Flegrei caldera, and possibly identifying its feeding system at depth. The present study provides a joint analysis of the very shallow seismic reflection data and tomographic images based on the Serapis dataset. This is achieved by reflection seismic sections obtained by the 3D data gathering and through refined P-velocity images of the shallowest layer of Pozzuoli Gulf (z<1,000 m). From the refined Vp model, the overall picture of the velocity distribution confirms the presence of a complex arc-shaped anomaly that borders the bay offshore. The deeper part of the anomaly (beneath 700 m, with Vp>3,500 m/s) correlates with units made up of agglomerate tuffs and interbedded lava, which form the southern edge of the caldera, which was probably formed following the two large ignimbritic eruptions that marked the evolutionary history of the area under study. The upper part of the anomaly that tends to split into two parallel arcs is correlated with dikes, volcanic mounds and hydrothermal alteration zones noted in previous shallow reflection seismic analyses. The depth of the transition between the upper and lower parts of the anomaly is characterized by an abrupt Vp increase on the one-dimensional (1D) profiles extracted from the 3D tomographic model and by the presence of a strong reflector located at about 0.6/0.7 s Two Way Time (TWT) on Common Mid Point gathers. The move-out velocity analysis and stack of the P–P and P–S reflections at the layer bottom allowed to estimate relatively high Vp/Vs values (3.7±0.9). This hypothesis has been tested by a theoretical rock physical modeling of the Vp/Vs ratio as a function of porosity suggesting that the shallow layer is likely formed by incoherent, water saturated, volcanic and marine sediments that filled Pozzuoli Bay during the post-caldera activity.143 27