A5091671089- earthquake and tectonic studies
- Geological and Geophysical Studies Worldwide
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geological formations and processes
- Geological and Geophysical Studies
- Geology and Paleoclimatology Research
- Geological and Tectonic Studies in Latin America
- Geological Studies and Exploration
- Seismic Imaging and Inversion Techniques
- Geophysics and Gravity Measurements
- Landslides and related hazards
- Maritime and Coastal Archaeology
- Geotechnical and Geomechanical Engineering
- Geochemistry and Geologic Mapping
- Archaeological and Historical Studies
- Geomagnetism and Paleomagnetism Studies
- Seismology and Earthquake Studies
- Infectious Diseases and Tuberculosis
- Hydrocarbon exploration and reservoir analysis
- Earthquake Detection and Analysis
- Hydraulic Fracturing and Reservoir Analysis
- Marine and environmental studies
- Reservoir Engineering and Simulation Methods
- Ecology and biodiversity studies
Université de Bretagne Occidentale
2014-2024
Centre National de la Recherche Scientifique
2012-2024
Ifremer
2022-2024
Institut Universitaire Européen de la Mer
2012-2022
Université Côte d'Azur
2000-2021
Université de Montpellier
2021
Académie de Paris
2021
Université de Strasbourg
2021
Geo-Ocean
2019-2020
Océanopolis
2003-2019
We present new geodetic results of crustal velocities over a large part northern Asia based on GPS measurements in the Baikal rift zone and Mongolia spanning 1994–2002 period. combine our with velocity field for China Wang et al. [2001] derive consistent most Asia. find contrasted kinematic strain regimes Mongolia, northward N‐S shortening westernmost but eastward to southeastward motion left‐lateral shear central eastern Mongolia. This is accommodated by slip E‐W trending Tunka, Bolnay,...
We investigate the active seismogenic fault system in area of 2003 Mw 6.9 Boumerdes earthquake, Algeria, from a high‐resolution swath bathymetry and seismic survey. A series 5 main fault‐propagation folds ∼20–35 km long leave prominent cumulative escarpments on steep slope deep basin. Fault activity creates Plio‐Quaternary growth strata within uplifted areas such as rollover basin piggyback basins ocean. Most thrusts turn to at sub‐surface depict ramp‐flat trajectories. find that two slip...
Abstract The Messinian salinity crisis (MSC) [Hsü et al., 1973] has deeply shaped the Mediterranean landscape and triggered large sedimentary deposits (evaporites clastics) in deep basins within a short time span. Until recently, MSC mainly been analyzed independently, either through outcrops located onshore (e.g. Morocco, Cyprus, Spain, Sardinia, Italy) or marine seismic profiles offshore. Each approach bears its own limitations: (1) on one hand, land refer to incomplete successions that...
The Ligurian basin, western Mediterranean Sea, has opened from late Oligocene to early Miocene times, behind the Apulian subduction zone and partly within Alpine belt. We analyze deep structures of basin its conjugate margins in order describe tectonic styles opening investigate possible contributions forces responsible for formation, especially pulling force induced by retreating hinge gravitational body wedge. To undertake this analysis, we combine new multichannel seismic reflection data...
Abstract The correspondence between the predicted brittle–plastic transition within crust and maximum depth of earthquakes is examined in case Baikal rift, Siberia. Although little accurate information on depths available through large- moderate-size earthquakes, there are frequent indications foci at 20 km more. We have relocated 632 events recorded nearby stations that occurred 1971 1997, with epicentral uncertainties less than 5 km, over eastern southern parts rift. compared these results...
Active continental rifts are spectacular manifestations of the deformation continents but not very numerous at surface Earth. Among them, Baikal rift has been extensively studied during last decades. Yet no simple scenario explains its origin and development because style rifting changed throughout ∼30 Myr history. In this paper, we use forward inverse models gravity data to map Moho lithosphere‐asthenosphere boundary in three dimensions. We then integrate these new results with existing...
[1] The Algerian margin has originated from the opening of basin about 25–30 Ma ago. central provides evidence for large-scale normal faults Oligo-Miocene age, whereas transcurrent tectonics characterizes western margin. A set NW–SE oriented dextral transform was active during and divided 600 km long into segments ∼120–150 km. upper Miocene, Plio-Quaternary, present-day tectonic setting is, however, compressional supports occurrence a inversion, process still poorly documented worldwide. We...
Intraplate extension, in a frame of global compressional stress field, seems linked to local lithospheric perturbations (lithospheric thinning or thickening) able modify the resulting state [ Zoback , 1992]. The Baikal Rift Zone (BRZ), Siberia, is located north India‐Asia collision zone and exhibits no direct communication with any oceanic domain. It can thus be fully considered as an area continental dominated by “global intraplate field” from plate driving forces. In order address problem...
The question of plate boundary forces and deep versus shallow asthenospheric uplift has long been debated in intracontinental rift areas, particularly the Baikal zone, Asia, which is colder than other continental rifts. As previous gravity teleseismic studies support dominance opposing mechanisms rift, we reconsidered both data sets jointly inverted them. This more effective approach brings insight into location perturbing bodies related to extension this region. Our new joint inversion...
Abstract. Shaking by moderate to large earthquakes in the Mediterranean Sea has proved past potentially trigger catastrophic sediment collapse and flow. On 21 May 2003, a magnitude 6.8 earthquake located near Boumerdès (central Algerian coast) triggered turbidity currents responsible for 29 submarine cable breaks at foot of continental slope over ~150 km from west east. Seafloor bathymetry backscatter imagery show potential imprints 2003 event previous events. Large scarps resulting active...
The origin of the Algerian margin remains one key questions still discussed in Western Mediterranean sea, due to imprecise nature and kinematics associated basin during Neogene. For first time, deep structure Maghrebian was explored SPIRAL seismic survey. In this work, we present a N‐S transect off Tipaza (west Algiers), place where broadens topographic high (Khayr‐al‐Din Bank). New penetration profiles allow us image sedimentary sequence crustal at continent‐ocean boundary. Modeling...
We determine the deep structure of eastern Algerian basin and its southern margin in Annaba region (easternmost Algeria), to better constrain plate kinematic reconstruction this region. This study is based on new geophysical data collected during SPIRAL cruise 2009, which included a wide-angle, 240-km-long, onshore–offshore seismic profile, multichannel reflection lines gravity magnetic data, complemented by available for area. The analysis modelling wide-angle including refracted reflected...
Three years and four campaigns of Global Positioning System (GPS) measurements (1994–1997) in the Baikal rift zone, largest active continental system Eurasia, show crustal extension at a rate 4.5±1.2 mm/yr WNW‐ESE direction. A comparison with moment release large historical earthquakes suggests that elastic strain is currently accumulating zone along faults have potential for M=7.5 earthquake. The GPS‐derived least two times greater than prediction most deformation models Asia. This result...
We present a joint inversion of gravity and teleseismic data to enlighten the lithospheric structures Baikal–Mongolia region, an area characterized by high topographic contrasts, sporadic Cenozoic volcanism, extension large transcurrent faulting in vicinity Baikal Rift, Central Asia. The study uses 1000 km long seismic transect that cross-cuts main tectonic from north south (namely, Siberian platform, Tunka basin, Hangay Dome Gobi-Altai belt).