Seismic Exploration of the Deep Structure and Seismogenic Faults in the Ligurian Sea by Joint Multi Channel and Ocean Bottom Seismic Acquisitions: Preliminary Results of the SEFASILS Cruise

Type Article
Date 2020-03
Language English
Author(s) Dessa Jean-Xavier1, Beslier Marie-Odile2, Schenini Laure2, Chamot-Rooke Nicolas3, Corradi Nicolà4, Delescluse Matthias3, Déverchère Jacques5, Larroque Christophe6, Sambolian Serge2, Canva Albane2, Operto Stéphane2, Ribodetti Alessandra2, Agurto-Detzel Hans2, Bulois Cédric2, Chalumeau Caroline2, Combe Laure2
Affiliation(s) 1 : Université Côte d'Azur, Sorbonne Université, CNRS, IRD, Observatoire de la Côte d'Azur, Géoazur, 250 rue Albert Einstein - CS 10269 - F 06905 Sophia-Antipolis CEDEX, France
2 : Université Côte d'Azur, CNRS, IRD, Observatoire de la Côte d'Azur, Géoazur, 250 rue Albert Einstein - CS 10269 - F 06905 Sophia-Antipolis CEDEX, France
3 : Laboratoire de Géologie, École Normale Supérieure, PSL Research University, CNRS - F 75231 Paris, France
4 : DISTAV, Universita di Genova, Corso Europa, 26 - 16132 Genova, Italy
5 : Univ. Brest, CNRS, Laboratoire Géosciences Océan - F 29280 Plouzané, France
6 : Université Côte d'Azur, Université de Reims, CNRS, IRD, Observatoire de la Côte d'Azur, Géoazur, 250 rue Albert Einstein - CS 10269 - F 06905 Sophia-Antipolis CEDEX, France
Source Geosciences (2076-3263) (MDPI AG), 2020-03 , Vol. 10 , N. 3 , P. 108 (11p.)
DOI 10.3390/geosciences10030108
Note This article belongs to the Special Issue Selected Papers from the “2019 IMEKO TC-19 International Workshop on Metrology for the Sea”
Keyword(s) Western Mediterranean, Ligurian basin, tectonic inversion, salt tectonics, crustal geophysical exploration, multichannel seismic imaging, wide-angle seismic recording
Abstract

The north Ligurian margin is a complex geological area in many ways. It has witnessed several phases of highly contrasting deformation styles, at both crustal scale and that of shallower cover tectonics, simultaneously or in quick succession, and with significant spatial variability. This complex interplay is mirrored in the resulting intricate structures that make it hard to identify active faults responsible for both, the significant seismicity observed, and the tectonic inversion undergone by the margin, identified at longer time scales on morphostructural grounds. We present here the first preliminary results of the leg 1 of SEFASILS cruise, conducted in 2018 offshore Monaco, in an effort to answer these questions by means of modern deep seismic acquisitions, using multichannel reflection and wide-angle sea-bottom records. Some first interpretations are provided and point towards an active basement deformation that focuses at the limits between main crustal domains.

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Dessa Jean-Xavier, Beslier Marie-Odile, Schenini Laure, Chamot-Rooke Nicolas, Corradi Nicolà, Delescluse Matthias, Déverchère Jacques, Larroque Christophe, Sambolian Serge, Canva Albane, Operto Stéphane, Ribodetti Alessandra, Agurto-Detzel Hans, Bulois Cédric, Chalumeau Caroline, Combe Laure (2020). Seismic Exploration of the Deep Structure and Seismogenic Faults in the Ligurian Sea by Joint Multi Channel and Ocean Bottom Seismic Acquisitions: Preliminary Results of the SEFASILS Cruise. Geosciences, 10(3), 108 (11p.). Publisher's official version : https://doi.org/10.3390/geosciences10030108 , Open Access version : https://archimer.ifremer.fr/doc/00615/72690/