A5001182403- earthquake and tectonic studies
- Geological and Geophysical Studies Worldwide
- Geological and Tectonic Studies in Latin America
- Geological and Geochemical Analysis
- Geological and Geophysical Studies
- Geological formations and processes
- Seismic Imaging and Inversion Techniques
- Seismic Waves and Analysis
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Seismology and Earthquake Studies
- High-pressure geophysics and materials
- Reservoir Engineering and Simulation Methods
- Maritime and Coastal Archaeology
- Geophysics and Sensor Technology
- Hydrocarbon exploration and reservoir analysis
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Drilling and Well Engineering
- Advanced Fiber Optic Sensors
- Paleontology and Stratigraphy of Fossils
- Marine and environmental studies
- Aeolian processes and effects
- Geological Studies and Exploration
- Infectious Diseases and Tuberculosis
Centre National de la Recherche Scientifique
2011-2025
Ifremer
2022-2025
Institut Universitaire Européen de la Mer
2013-2023
Université de Bretagne Occidentale
2012-2022
Geo-Ocean
2009-2021
Océanopolis
2015-2021
Laboratoire d’Océanologie et de Géosciences
2009-2019
Laboratoire de Biotechnologie et Chimie Marines
2019
Université Européenne de Bretagne
2008-2015
Institut de Recherche pour le Développement
2004-2005
Subduction of the Nazca plate beneath Ecuador‐Colombia margin has produced four megathrust earthquakes during last century. The 500‐km‐long rupture zone 1906 ( M w = 8.8) event was partially reactivated by three thrust events, in 1942 7.8), 1958 7.7), and 1979 8.2), whose zones abut one another. Multichannel seismic reflection bathymetric data acquired SISTEUR cruise show evidence that wedge is segmented transverse crustal faults potentially correlate with limits earthquake coseismic slip...
The 26 December 2004 Sumatra earthquake (Mw = 9.1) initiated around 30 km depth and ruptured 1300 of the Indo-Australian Sunda plate boundary. During OBS (ocean bottom seismometer) survey, a wide angle seismic profile was acquired across epicentral region. A velocity model obtained from combined travel time tomography forward modeling. Together with reflection data SeaCause II cruise, deep structure source region great is revealed. Four to five kilometers sediments overlie oceanic crust at...
Abstract Whether subducted oceanic reliefs such as seamounts promote seismic rupture or aseismic slip remains controversial. Here we use swath bathymetry, prestack depth‐migrated multichannel reflection lines, and wide‐angle data collected across the central Ecuador subduction segment to reveal a broad ~55 km × 50 km, ~1.5–2.0 high, low height‐to‐width ratio, multipeaked, sediment‐bare, shallow relief. Owing La Plata Island coastline being located, respectively, ~35 ~50–60 from trench, GPS...
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...
After the January 12, 2010, Haiti earthquake, we deployed a mainly offshore temporary network of seismologic stations around damaged area.The distribution recorded aftershocks, together with morphotectonic observations and mainshock analysis, allow us to constrain complex fault pattern in area.Almost all aftershocks have N-S compressive mechanism, not expected left-lateral strike-slip mechanism.A first-order slip model shows N264°E north-dipping plane, major component strong reverse...
Abstract In the Ionian Sea (central Mediterranean) slow convergence between Africa and Eurasia results in formation of a narrow subduction zone. The nature crust subducting plate remains debated could represent last remnants Neo‐Tethys ocean. origin basin is also under discussion, especially concerning rifting mechanisms as Malta Escarpment remnant this opening. This retreats toward south‐east (motion occurring since 35 Ma) but confined to basin. A major lateral slab tear fault required...
Abstract Oblique collision of buoyant provinces against subduction zones frequently results in individualizing and rotating regional‐scale blocks. In contrast, the Bahamas Bank Northeastern Caribbean Plate increased margin convexity triggering forearc fragmentation into small‐scale This deformation a prominent sequence V‐shaped basins that widens trenchward separated by elevated spurs, Northern Lesser Antilles (NLA, i.e., Guadeloupe to Virgin Island). absence deep structure imaging, various...
[1] It is widely accepted that the Central and Eastern Mediterranean are remnants of Neo-Tethys. However, orientation timing spreading this domain remain controversial. Here, we present time migrated pre-stack depth NW-SE oriented Archimede (1997) lines together with PrisMed01 (1993) profile to constrain evolution Ionian basin. Our interpretation allows us identify a large-scale set SW-NE striking reverse faults beneath Abyssal Plain. These primarily NW vergent have characteristic spacing 10...
Abstract The influence of the highly oblique plate convergence at northern Lesser Antilles onto margin strain partitioning and deformation pattern, although frequently invoked, has never been clearly imaged. Anegada Passage is a set basins deep valleys, regularly related to southern boundary Puerto Rico‐Virgin Islands (PRVI) microplate. Despite publications various tectonic models mostly based on bathymetric data, origin this remains unconstrained in absence structure imaging. During cruises...
The deep structure of the Ecuador subduction zone and adjacent Carnegie Ridge (CR) was investigated using on‐shore off‐shore wide‐angle seimics. A crustal model obtained by 2‐D inversion traveltimes reveals overthickened (14 km) oceanic crust CR that underthrusts high velocity (>6 km/s) basement upper plate margin wedge, interpreted as part accreted terranes described on‐shore. interface dips 4° to 10° east from trench a depth 15 km. Shadow zones observed on OBS records are low consisting...
Research Article| July 01, 2009 Megathrust earthquakes can nucleate in the forearc mantle: Evidence from 2004 Sumatra event J.-X. Dessa; Dessa 1GéoAzur, Université Pierre et Marie Curie, CNRS-IRD-UNS, 2 quai de la Darse, BP 48, F-06235 Villefranche-sur-Mer, France Search for other works by this author on: GSW Google Scholar F. Klingelhoefer; Klingelhoefer 2IFREMER, 70, F-29280 Plouzané, D. Graindorge; Graindorge 3Institut Universitaire Européen Mer (UBO), Technopôle Brest-Iroise, Place...
Forearc tectonics at accretionary convergent margins has variously been studied using analogue and numerical modelling techniques. Numerous geophysical investigations have targeted the subsurface structure of active forearc settings margins. However, several critical details structure, mode tectonic evolution role forearcs play in subduction seismic cycle remain to be further understood, especially for large In this study, we present a high-resolution deep reflection image northern Sumatran...
Plate motion along concave (toward the upper plate) strike slip to subduction transition (SSST) where down going plate does not tear, results over time in a lengthening of zone while downgoing is transported transform margin. In northern Antilles such has developed since late Paleogene Bahamas bank swept margin and collided with Hispaniola westward. Tectonic record Puerto-Rico (PR), Anegada Lesser (NLA) reveals modalities SSST evolution gives insights into interaction between subducting...
The Cotentin Peninsula (CP), located in north-western France, represents the northern extension of North Armorican Domain (NAD), which forms a structural rim central Channel. NAD, including and Channel Islands, has been shaped by major geodynamic processes such as Icartian (~2 Ga), Cadomian (~580 Ma), Hercynian (~300 Ma) orogenies. Subsequently, development Meso-Cenozoic sedimentary basins, although modest extent thickness, further influenced area. particular, experienced differential...
The Walvis transform marginal plateau constitutes a key geodynamic node in the evolution of South Atlantic Ocean. It is conjugate Santos plateau. Both plateaus formed associated successively with: (1) Austral rifting marking separation southwestern Gondwana during end Late Jurassic and Early Cretaceous with northward propagating breakup between 133-124 Ma (M11 à M2). This stage was narrowly mantle plume Tristan Da Cunha Hot spot, at origin Paranà-Etendeka Trapp (135-132...
The Demerara Plateau is a submarine bathymetric high, 230 km-long and 170 km-wide, lying between 1000 3000 m-depth, located north of French Guiana Suriname shelves. On its northeastern border, the Bastille 16 km-long, 9 km-wide relief, at intersection Cretaceous transform divergent margins Plateau. It represents crucial witness for understanding early stages Equatorial Atlantic opening. Seismic profiles from GUYAPLACa (2003) MARGATSb (2016) cruises reveal that continentward tilted block with...
Abstract The opening of the Equatorial Atlantic Ocean constitutes final stage Gondwana's breakup, leading to separation African and South American continents. early spreading has been debated due absence magnetic anomalies related Early Cretaceous at low latitude, an incomplete fracture zone record, hidden by volcanic overprint and/or partially subducted. This study proposes a novel kinematic reconstruction dedicated rifting refined from existing model. Our approach integrates seismic...