GNGTS 2014 - Atti del 33° Convegno Nazionale

24 GNGTS 2014 S essione 3.1 the stacking, defining a correct velocity function of the primary reflections and relieving the mistaken coherent noise. The predictive deconvolution has been carried out on the seismic data in order to eliminate or further reduce the multiple signals which characterize the same section, allowing to get back the high frequencies and reconstruct the waveform. The seismic signals on the sections appear more compressed and consequently, it was simpler to identify the seismic reflectors during the geologic interpretation. In the Ischia-Capri-Volturno alignment of the Campania continental margin several important morpho-structures have been identified: the Banco di Fuori, a morpho-structural high of Meso- Cenozoic carbonates, bounding southwards the Naples Bay; the Dohrn canyon, separating the eastern side of the Naples Bay, where sedimentary sequences crop out, from the western one, where volcanic seismic units prevail; the Capri structural high, having a sedimentary nature and is related to the regional uplift of Meso-Cenozoic carbonates along the Capri-Sorrento alignment; the Magnaghi canyon, eroding the Mg volcanic seismic unit southwards of the Procida island; the Capri basin, which is a deep basin located southwards of the Naples Bay, filled by Pleistocene-Holocene sediments overlying the Meso-Cenozoic carbonate unit; the Salerno Valley, a half-graben filled by three seismic units corresponding to Quaternary marine deposits, overlying chaotic sequences related to the Cilento Flysch; the Volturno basin, filled by four marine to deltaic seismic sequences, frequently alternating with volcaniclastic levels, overlying deep seismic units, correlated with Miocene flysch deposits (sands and shales) and Meso-Cenozoic carbonates. The seismic profile Sister4_2, NE-SW trending, extends for a length of 66 kilometers on the Campania continental margin. It starts on the continental slope offshore Bocca Piccola, namely a saddle located between the Sorrento Peninsula and the Capri island and crosses the Dohrn and the Magnaghi canyons, reaching the structural high of the Ischia volcanic complex. The seismic sections ends on the continental slope of the Northern Campania continental margin in the Volturno Basin. Three physiographic and depositional domains have been distinguished through the seismic interpretation. The first domain is represented by the continental slope surrounding the Capri island and the Bocca Piccola offshore. The second domain is represented Fig. 1 – Deep multichannel seismic profile showing the seismic stratigraphy of the Campania continental margin between the Bocca Piccola offshore (Capri island) and the Dohrn canyon. Mc: Mesozoic carbonate unit. A: Middle- Late Pleistocene prograding wedge. C: Late Pleistocene prograding wedge. The two wedges constitute the bulk of the stratigraphic architecture of the Naples Bay.