caa a22 4500 44536503X CHVBK 20180317142927.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s11001-010-9108-7 doi (NATIONALLICENCE)springer-10.1007/s11001-010-9108-7 Morphotectonic and fault-earthquake relationships along the northern Ligurian margin (western Mediterranean) based on high resolution, multibeam bathymetry and multichannel seismic-reflection profiles [Elektronische Daten] [Christophe Larroque, Bernard de Lépinay, Sébastien Migeon] We present here new data from the MALISAR surveys that focus on two areas of the northern Ligurian margin where we reveal recent and active deformation. A set of N60°E scarps that are oblique to the margin is seen at the foot of the continental slope. These correspond to cumulated reverse-strike slip faulting that is consistent with the present-day kinematics of earthquakes. At the north-western margin, the Marcel Fault appears at the surface as a 10-km-long scarp trending N60°E. Several earthquakes of moderate magnitude (3.8<ML<4.6) have focal mechanisms consistent with the geometry and the kinematics of, and have been located around, the Marcel Fault. At the north-eastern margin, offshore of Imperia, the major feature is a large promontory that is bound by a network of N60°E faults on its southern side. The structures and the deflection of the drainage network are consistent with a recent uplift of the Imperia Promontory. No surface ruptures have been identified in the epicentre area of the 1887 Ligurian earthquake (the major historical regional event: MW ~6.5-6.7), although the Imperia Fault network has the necessary characteristics to account for this earthquake. Therefore, from the present study, we propose that the rupture, as a reverse-strike slip faulting of a few or all of the segments belonging to the Imperia Fault network, was the source of the 1887 event. These MALISAR data have allowed identification of an 80-km-long transpressive system of Plio-Quaternary faults. The question of the potential activation of all of these faults during a single event is now of major concern, which has led to reappraisal of the regional seismic hazard as moderate to high. Springer Science+Business Media B.V., 2010 Active tectonics nationallicence Sub-marine morphotectonics nationallicence Earthquakes nationallicence Seismic hazard nationallicence Southwestern Alps nationallicence Ligurian Basin nationallicence Larroque Christophe UMR GéoAzur, Université de Nice-Sophia Antipolis, CNRS, OCA, 250 Rue A. Einstein, 06560, Valbonne, France aut de Lépinay Bernard UMR GéoAzur, Université de Nice-Sophia Antipolis, CNRS, OCA, 250 Rue A. Einstein, 06560, Valbonne, France aut Migeon Sébastien UMR GéoAzur, Université de Nice-Sophia Antipolis, CNRS, OCA, Port de la darse, 06235, Villefranche/Mer, France aut Marine Geophysical Research Springer Netherlands 32/1-2(2011-03-01), 163-179 0025-3235 32:1-2<163 2011 32 11001 https://doi.org/10.1007/s11001-010-9108-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11001-010-9108-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Larroque Christophe UMR GéoAzur, Université de Nice-Sophia Antipolis, CNRS, OCA, 250 Rue A. Einstein, 06560, Valbonne, France aut NATIONALLICENCE 700 1- de Lépinay Bernard UMR GéoAzur, Université de Nice-Sophia Antipolis, CNRS, OCA, 250 Rue A. Einstein, 06560, Valbonne, France aut NATIONALLICENCE 700 1- Migeon Sébastien UMR GéoAzur, Université de Nice-Sophia Antipolis, CNRS, OCA, Port de la darse, 06235, Villefranche/Mer, France aut NATIONALLICENCE 773 0- Marine Geophysical Research Springer Netherlands 32/1-2(2011-03-01), 163-179 0025-3235 32:1-2<163 2011 32 11001 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer