Active volcano-tectonic deformations: a 3D seismic reflection experiment in the resurgent dome of the NYT Caldera (Pozzuoli Bay, Campi Flegrei, Naples)

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Abstract

An ultra-resolution, 3D seismic reflection data cube was collected during an oceanographic cruise organizedin the frame of a joint project involving Italian research institutions, the University of Palermo, Cataniaand Napoli, CNR of Napoli and INGV Roma, and two companies, the Geo Marine Survey System (TheNetherlands) and GeoSurvey (Portugal). The data acquisition approach charted during this cooperation wasbased on innovative technologies for the offshore imaging of stratigraphy and structures at continental marginswith horizontal and vertical resolution at decimetric scale. In this work, we present the methodology usedfor the 3D HR-seismic reflection data acquisition and the preliminary interpretation of the 3D seismic cube.The 3D seismic data were acquired onboard the N/O Minerva Uno by using an innovative data acquisitionequipment composed by two sparker sources fired in flip-flop mode, and eight HR 48-channel, slant streamers,with group spacing variable from 1 to 2 meters, at 10 kHz sampling rate. An innovative navigation system wasused to perform all necessary computations to determining real-time positions of sources and receivers. Theinvestigated area is located in the central-northern part of the Pozzuoli (Naples) Bay that represents the offshoreprolongation of the Campi Flegrei caldera. Here, an antiformal structure, corresponding to the resurgent domeassociated with Neapolitan Yellow Tuff (NYT) caldera, characterizes the structure and morphology of theinner shelf (e.g. Sacchi et al., 2014). Previous research works based on 2 or 2.5D high-resolution reflectionseismics (e.g. Steinmann et al., 2018), have documented the presence of collapse faults on the summit (apicalgraben) of the resurgent dome. However the 3D pattern of this structure and the style of ground deformationare still poorly defined. The results of this study provide the base for the quantitative analysis of active faultsand stress field that are important for understanding the volcano-tectonic process responsible for the formationof the resurgence dome inside the caldera and its related hazard.
Lingua originaleEnglish
Numero di pagine1
Stato di pubblicazionePublished - 2018

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