MIGEON , Sébastien

A brief review of the published evidence of current deposits around Italy is the occasion to test the robustness of matching bottom current velocity models and seafloor morphologies to identify contourite drifts not yet documented. We present the result of the regional hydrodynamic model MARS3D in the Northern Tyrrhenian and Ligurian Sea with...

Les algorithmes d'apprentissage profond pour détecter automatiquement des objets à partir d'imagerie donnent, dans plusieurs domaines, des résultats prometteurs, et sont de plus en plus utilisés et accessibles sans expertise pointue. Nous souhaitons donc voir si leur utilisation sur de l'imagerie sous-marine comme la bathymétrie et ses dérivés,...

For over 50 years, sedimentary basins have been considered as the lithosphere's surface film, belonging to the subsurface domain and containing the vast majority of accessible mineral and energy resources. Beyond their human use, sedimentary basins are more importantly the ultimate exchange interface between the earth's main reservoirs....

International audience

International audience

The observation of coastal waters using satellite remote sensing is of primary importance to gain understanding on the complex processes occurring in those highly dynamical ecosystems. The analysis of ocean color data relies on the interaction between the incident sunlight daytime radiation that propagates within the ocean–atmosphere system and...

The analysis of satellite ocean color data that are acquired over coastal waters is highly relevant to gain understanding of the functioning of these complex ecosystems. In particular, the estimation of the suspended particulate matter (SPM) concentrations is of great interest for monitoring the coastal dynamics. However, a high number of...

Chronostratigraphic scheme illustrating the triggering periods of megaslides on the Nile fan

International audience

Large deep-sea fans are useful settings to study gas hydrate systems, the rapid burial of organic-rich sediment driving linked processes of gas generation, fluid expulsion and syn-sedimentary tectonism. The Nile deep-sea fan (100,000 km2) is a collapsing Late Cenozoic depocentre that is both a hydrocarbon province and an area of widespread...

Satellite remote sensing of coastal waters is important for understanding the functioning of these complex ecosystems. High satellite revisit frequency is required to permit a relevant monitoring of the strong dynamical processes involved in such areas, for example rivers discharge or tidal currents. One key parameter that is derived from...

La mer ligure : une région de montagnes sous-marines Le relief sous-marin de la région niçoise est particulièrement pentu, creusés par des canyons, et certains évènements, tels que des séismes, peuvent le déstabiliser jusqu'à provoquer des glissements de terrain sous-marins. Glissement de terrain meurtrier et tsunami au large de Nice Le 16...

The Nile deep-sea fan (NDSF), turbiditic system reaching a size of about 90,000 km2, has been investigated since 1998 by several geophysical methods (multibeam bathymetry, backscatter imagery, seismic data, 3–5 kHz echo-sounding). The analysis of this important data set evidenced that the NDSF is the locus of numerous multi-scale slope...

The equatorial Atlantic margin to the north of the Amazon is strongly affected by gravi- tational processes presenting all forms of rupture of submarine slopes, representing a major geological hazard. The potential causal factors of these underwater landslides were studied from the integration of marine geophysical data (sediment sounder) and...

Chronostratigraphic scheme illustrating the triggering periods of megaslides on the Amazon fan

SEAGAS is a 3-year initiative to study processes in the deep sea, involving research groups in Brazil and Europe, including in Germany. The project is being coordinated by PUCRS in collaboration with Géoazur in Nice, France. The hosts have complementary strengths in marine geoscience as applied to submarine gas hydrates, consistent with the...

Using earthquakes and seismic noise recordings on a broad-band station installed in October 2016 on the slope of the Nice airport at 17 m depth, we find a strong site amplification of the seismic waves (factor 10 around a frequency of 1Hz).The effects of superficial layers on the amplitude, frequency and duration of seismic waves (often called...

Rare in situ pore pressure and temperature data sets collected over more than one decade in a submarine landslide-prone area off Nice (Southeast France) have been used to characterize a transient groundwater exchange between a coastal confined aquifer and the nearshore shallow-water submarine shelf. The near-coast study zone is highly exposed...

A smart city must be equipped with efficient and interconnected transportation. Unfortunately, economic or operational reasons for creating an infrastructure sometimes compete with imperatives of natural hazards. The case of Nice Cote d'Azur airport is an interesting example. As air traffic increased, the airport has been progressively...