Abstract
The Campanian volcanism develops near the sea. Therefore, the geophysical study of the marine environment is a key to a better understanding of the tectonic evolution and the origin of volcanism in the area. An abundance of high quality seismic data in the marine sector, where little direct information is available, is critical to the study of Campanian volcanism. This paper concerns the reprocessing of a seismic reflection dataset acquired in Naples Bay and processed during 1973. Even though the overall data quality was high for that time, of course their acquisition technological limits have been overcome by the new processing. Our reprocessing aimed at: 1) reduction of random noise in the data; 2) removal of unwanted coherent events; 3) reduction of spatial aliasing by means of trace interpolation on Commod Shot Point (CSP) gathering; 4) improvement of resolution of the seismic wavelet with spiking deconvolution algorithms and finally 5) reposition of reflectors in their correct locations in the space-TWT domain by means of dip moveout and post-stack time migration. A comparison between the new and old data shows that the new sections are characterized by a much higher S/N ratio. Diffraction hyperbole has been collapsed. Reverberations, ghosts and multiples have been removed or greatly attenuated, especially between the reflectors of interest, allowing us to follow them with more detail and with greater continuity. Furthermore, data resolution has been boosted by the reprocessing, allowing the interpreter to evaluate reflector position and continuity in greater detail. The reinterpretation phase of such lines, that is already in an advanced stage, will therefore allow us to gain new insights into the structural setting of the bay, with the aim of exploring the connection between tectonics and volcanism.
Highlights
This paper concerns the reprocessing of a seismic reflection dataset acquired in Naples Bay (NB) by OGS
The Campanian volcanism develops near the sea; Procida and Ischia are volcanic islands
Somma morphology is the result of different collapse episodes which have determined the westward downfall of part of the mountain (Bruno and Rapolla, 1999), the sinking of the upper part of the volcano and the formation of a caldera
Summary
This paper concerns the reprocessing of a seismic reflection dataset acquired in Naples Bay (NB) by OGS An abundance of high quality geophysical data (and among them seismic data, which allow the highest resolution) is critical to the study of marine environments where little direct information is available. More recent seismic data collected in NB are, in most cases, high resolution − single channel sparker and uniboom profiles, which allow the shallow Plio-Quaternary cover to be studied in detail, but do not penetrate deep. Fault geometry and kinematics, and in some cases the tectonic involvement of the deep geological units are hypothetical For all these reasons the sea environment geology in the Gulf of Naples is less known than the onshore areas. Reprocessing old seismic data has become a standard in the oil industry since technological advances bring notable improvements to the data in terms of Signal-to-Noise (S/N) ratio, allowing the interpreter to obtain new information at low cost
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