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Registros recuperados: 5
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A complete structural model and kinematic history for distributed deformation in the Wharton Basin ArchiMer
Stevens, Duncan E.; Mcneill, Lisa C.; Henstock, Timothy J.; Delescluse, Matthias; Chamot-rooke, Nicolas; Bull, Jonathan M..
The equatorial eastern Indian Ocean hosts a diffuse plate boundary, where widespread deformation accommodates the relative motion between the Indian, Australian and Capricorn sub-plates. We integrate IODP Expedition 362 borehole data, which for the first time provides an accurate, ground-truthed chronostratigraphy of the sedimentary sequence east of the Ninety East Ridge (NER), with 2D seismic reflection profiles and multibeam bathymetry to assess the styles of faulting between the NER and the Sunda subduction zone, timing of activity and comparison with physical and rheological properties. We identify four distinct fault sets east of the NER in the northern Wharton Basin. N-S (350-010°) orientated faults, associated with the N-S fracture zones formed at...
Tipo: Text Palavras-chave: Intraplate deformation; Indian Ocean; Diffuse plate boundary; IODP.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00617/72936/71957.pdf
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Instantaneous deformation and kinematics of the India-Australia Plate ArchiMer
Delescluse, Matthias; Chamot-rooke, Nicolas.
Active intraplate deformation of the India-Australia Plate is now being captured by far-field global positioning system (GPS) measurements as well as measurements on a few islands located within the deforming zone itself. In this paper, we combine global and regional geodetic solutions with focal mechanisms of earthquakes to derive the present-day strain field of the India-Australia Plate. We first compile an updated catalogue of 131 Indian intraplate earthquakes (M > 5) spanning the period between the two Asian mega earthquakes of Assam 1897 and Sumatra 2004. Using Haines and Holt's numerical approach applied to a fully deformable India-Australia Plate, we show that the use of GPS data only or earthquakes data only has severe drawbacks, related,...
Tipo: Text Palavras-chave: Earthquakes; India-Eurasia collision; Intraplate deformation; Global positioning system (GPS); Plate tectonics; Strain modelling.
Ano: 2007 URL: https://archimer.ifremer.fr/doc/00238/34944/33246.pdf
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Neotectonics of the Owen Fracture Zone (NW Indian Ocean): Structural evolution of an oceanic strike-slip plate boundary ArchiMer
Rodriguez, M.; Fournier, M.; Chamot-rooke, Nicolas; Huchon, P.; Bourget, Julien; Sorbier, M.; Zaragosi, S.; Rabaute, A..
The Owen Fracture Zone is a 800 km-long fault system that accommodates the dextral strike-slip motion between India and Arabia plates. Because of slow pelagic sedimentation rates that preserve the seafloor expression of the fault since the Early Pliocene, the fault is clearly observed on bathymetric data. It is made up of a series of fault segments separated by releasing and restraining bends, including a major pull-apart basin at latitude 20 degrees N. Some distal turbiditic channels from the Indus deep-sea fan overlap the fault system and are disturbed by its activity, thus providing landmarks to date successive stages of fault activity and structural evolution of the Owen Fracture Zone from Pliocene to Present. We determine the durability of relay...
Tipo: Text Palavras-chave: Indian Ocean; Owen Fracture Zone; Pull-apart; Transform fault.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00133/24426/22435.pdf
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Owen Ridge deep-water submarine landslides: implications for tsunami hazard along the Oman coast ArchiMer
Rodriguez, M.; Chamot-rooke, Nicolas; Hebert, H.; Fournier, M.; Huchon, P..
The recent discovery of voluminous submarine landslides along the Owen Ridge may represent a source of tsunami hazard for the nearby Oman coast. We assess the severity of this potential hazard by performing numerical simulations of tsunami generation and propagation from the biggest landslide (40 km3 in volume) observed along the Owen Ridge. A finite-difference model, assimilating the landslide to a visco-plastic flow, simulates tsunami generation. Computation results show that Salalah city (190 000 inhabitants) is impacted by 2.5 m-high tsunami waves one hour after sediment failure. Higher wave elevation values (4 m) are reached in the low populated Sawqara Bay over 80 min after slide initiation. Although large submarine failures along remote oceanic...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00133/24429/22443.pdf
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Seismic Exploration of the Deep Structure and Seismogenic Faults in the Ligurian Sea by Joint Multi Channel and Ocean Bottom Seismic Acquisitions: Preliminary Results of the SEFASILS Cruise ArchiMer
Dessa, Jean-xavier; Beslier, Marie-odile; Schenini, Laure; Chamot-rooke, Nicolas; Corradi, Nicolà; Delescluse, Matthias; Déverchère, Jacques; Larroque, Christophe; Sambolian, Serge; Canva, Albane; Operto, Stéphane; Ribodetti, Alessandra; Agurto-detzel, Hans; Bulois, Cédric; Chalumeau, Caroline; Combe, Laure.
The north Ligurian margin is a complex geological area in many ways. It has witnessed several phases of highly contrasting deformation styles, at both crustal scale and that of shallower cover tectonics, simultaneously or in quick succession, and with significant spatial variability. This complex interplay is mirrored in the resulting intricate structures that make it hard to identify active faults responsible for both, the significant seismicity observed, and the tectonic inversion undergone by the margin, identified at longer time scales on morphostructural grounds. We present here the first preliminary results of the leg 1 of SEFASILS cruise, conducted in 2018 offshore Monaco, in an effort to answer these questions by means of modern deep seismic...
Tipo: Text Palavras-chave: Western Mediterranean; Ligurian basin; Tectonic inversion; Salt tectonics; Crustal geophysical exploration; Multichannel seismic imaging; Wide-angle seismic recording.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00615/72690/71694.pdf
Registros recuperados: 5
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