MIGEON , S.

The recent conclusion of the Magic Project (Marine Geohazards along the Italian Coasts) (Chiocci & Ridente, 2011), the MALISAR Cruises (Migeon et. Al., 2011; Migeon et al., 2012) and the contribution of the data available at the Universities of Genoa (IT) and Trieste (IT) allowed us to identify and study the large series of erosional and...

We present a new numerical surface process model allowing us to take into account submarine erosion processes due either to submarine landslides or to hyperpycnal currents. A first set of models show that the frequency of hyperpycnal flows influences the development of submarine canyons at the mouth of continental rivers. Further experiments...

The Ligurian sea, at the France–Italy boarder of the Mediterranean Sea, has experienced in the past numerous submarine landslides within its very near continental slope, the continental shelf being very narrow. The most recent occurred on the 1979 October 16 near Nice international airport and generated tsunami waves of order 3 m of amplitude...

Marine Geology, v. 250, n. 3-4, p. 180-198, 2008. http://dx.doi.org/10.1016/j.margeo.2008.01.016

Debrites with different volumes, depositional periods and setting are observed in the Nile deep-sea fan system. Here we present debrites from four late Quaternary environments: (i) within the Rosetta submarine channel at 1700 m; (ii) within small basins created by salt tectonics in the Eastern Province at 1300 m; (iii) on the open slope outside...

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...

Geo-Marine Letters, v. 26, n. 6, p. 361-371, 2006. http://dx.doi.org/10.1007/s00367-006-0047-x

Although there is a common agreement on the importance of conservation of Mediterranean submarine canyons amongst international organizations, their governance is complex: the canyons' extension covers waters and seabeds under various types of jurisdictions (territorial waters, Fisheries Protection Zone, Ecological Protection Zone, including...

The Var Turbidite System (NW Mediterranean Sea) is fed during the present-day highstand sea level by large earthquake-induced ignitive turbidity currents, low-density turbidity currents resulting from retrogressive failures triggered on the upper continental slope, and hyperpycnal flows related to the Var River floods. Using a large dataset...

Journal of Sedimentary Research, v. 74, n. 4, p. 580-598, 2004. http://dx.doi.org/10.1306/091603740580

International audience

International audience

During the Pleistocene, the Matakaoa Debris Avalanche (MDA) removed ~ 430 km3 of material and formed a 50 km-long re-entrant in the Matakaoa margin, offshore East Cape, New Zealand. In this study, we examine the post-avalanche processes of continental slope reconstruction via the analysis of bathymetry, seismic-reflection data and one sediment...

The morphology of Patia and Mira canyons on the South Colombian convergent margin reflects an interplay between tectonic deformation, sea-level variation and canyon evolution, and provides new insight into the age and location of margin deformation over the last ~ 150 ka. Multibeam bathymetry, seismic, and sedimentary data reveal that...

Geo-Marine Letters, v. 22, n. 2, p. 112-120, 2002. http://dx.doi.org/10.1007/s00367-002-0096-8

Investigations of Mass-Transport Deposits (MTDs) and turbidite deposition in the confined North Ecuador subduction trench provide access to paleoseismic information and insights into long-term mechanisms for frontal tectonic erosion at a convergent margin. The studied trench has been the site of four great subduction earthquakes (7.7 ≤ Mw ≤...

The north Ecuador/south Colombia convergent margin is affected by recurrent subduction earthquakes with magnitudes > 7.5, like the 1906, 1942, 1958, 1979 and 2016 events. The subduction trench is characterized by the construction of the Esmeraldas Turbidite System (ETS) fed by the large Esmeraldas Canyon that deeply incises the continental...

A large-scale mass-transport deposit (MTD) called Sl6 was recognized on the upper slope of the western Nile margin, downslope from of a 30 km-long scarp located along the outer shelf. Regional mapping indicated that this MTD extends on nearly 505 km2 and involved about 14 km3 of Pleistocene-Holocene sediment. Sl6 was triggered between 10 and 9...

Marine Geology, v. 192, n. 1, p. 23-58, 2002. http://dx.doi.org/10.1016/S0025-3227(02)00548-0