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Registros recuperados: 8
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26th December 2004 great Sumatra-Andaman earthquake: Co-seismic and post-seismic motions in northern Sumatra ArchiMer
Sibuet, Jean-claude; Rangin, C; Le Pichon, X; Singh, S; Cattaneo, Antonio; Graindorge, D; Klingelhoefer, Frauke; Lin, Jing-yi; Malod, Jacques-andre; Maury, Tanguy; Schneider, J; Sultan, Nabil; Umber, Marie; Yamaguchi, H.
Trench-parallel thrust faults verging both landward and seaward were mapped in the portion of wedge located between northern Sumatra and the Indian-Indonesian boundary. The spatial aftershocks distribution of the 26th December 2004 earthquake shows that the post-seismic motion is partitioned along two thrust faults, the Lower and Median Thrust Faults, the latter being right-laterally offset by a N-S lower plate fracture zone located along the 93.6 degrees N meridian. Between February 2005 and August 2005, the upper plate aftershock activity shifted from southeast of this fracture zone to northwest of it, suggesting that the lower plate left-lateral motion along the fracture zone may have induced a shift of the upper plate post-seismic activity along the...
Tipo: Text Palavras-chave: Active thrust faults; Co seismic rupture; Aftershocks; 2004 Sumatra Andaman earthquake.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3508.pdf
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Campagne Nanhai: Etude structurale de l'ouverture de la mer de Chine ArchiMer
Pautot, G; Rangin, C; Briais, A; Beuzart, P; Lericolais, G; Mathieu, X; Wu, J; Han, S; Li, H.
We use observations from the 1985 R.V. Charcot Nanhai Cruise to document NW-SE spreading in the 150-200 km wide region of the South China Sea (SCS), along the 1000 km long axial ridge. The data include Seabeam and single channel seismic profiles, completed by magnetic and gravity anomalies. Two detailed surveyed boxes were performed on both sides of the ridge to illustrate the structural fabric. A fine scale structural survey of the flank of a seamount with a side-scan sonar is also presented, as well as dredges and cores results.
Tipo: Text
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00268/37942/36023.pdf
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Collision and strike-slip faulting in the Northern Molucca sea (Philippines and Indonesia) : preliminary results of a morphotectonic study IRD
Rangin, C; Dahrin, D.; Quebral, R.; Bader, A.G.; Cadet, J.P.; Caglarcan, G.; Deffontaines, B.; Deplus, C.; Corpus, E.G.; Hall, R.; Hello, Yann; Malod, J.; Lallemand, S.; Layugan, D.B.; Louat, Rémy; Morales, R.; Pankow, K.; Pubellier, M.; Popoff, M.; Rodelas, R.T.; Yudho, T..
A swath mapping, gravity and single channel seismic survey was carried out in the northern Molucca Sea with R.V. L'Atalante. Preliminary interpretation of these data reveals the presence of an almost complete Sangihe arc and forearc. The Miangas-Pujada-Talaud ridge in the central part of the Molucca Sea appears to be a backstop within the Sangihe forearc. East of the ridge very contrasting terranes are separated by a major NW-SE crustal discontinuity interpreted as a left-lateral strike-slip fault. North of 6°N the Philipine Trench inner wall is dissected by NW-SE trending left-lateral strike-slip faults, resulting from the dominantly oblique convergence between colliding arcs. South of 6°N the westward subduction of the buoyant Snellius volcanic plateau,...
Tipo: Text Palavras-chave: TECTONIQUE DE PLAQUES; SUBDUCTION; GEODYNAMIQUE; GEOLOGIE STRUCTURALE.
Ano: 1996 URL: http://www.documentation.ird.fr/hor/fdi:010009476
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Fine Scale Morphological and Structural Analysis of the East Pacific Rise, 21 degree N (Rita Project) ArchiMer
Rangin, C; Francheteau, J.
Manned submersible observations on a transect from the axis of the East Pacific Rise (21 degree N) to the area of the Brunhes-Matuyama magnetic inversion were made during the Cyamex and Rise diving phases of the Rita project. In the northern part of the study area, axial, linear, 400 to 600 m-wide topographic highs are formed by relatively unfaulted fresh pillow-lava-flows (zone 1). Flanking the axis of recent volcanism is a 1,200 to 1,500 m-wide zone of highly fractured volcanic hilly terrain (zone 2). Zone 3, could represent a former, large flooding episode of the sea floor at the axis of the Rise. Tectonic activity is particularly evident in zone 2, decreases rapidly across strike, and vanishes 12 km from the axis of the East Pacific Rise. The...
Tipo: Text
Ano: 1981 URL: http://archimer.ifremer.fr/doc/00246/35691/34199.pdf
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Homogeneous basalts from the East Pacific Rise at 21° N: seady state magma reservoirs at moderately fast spreading centers ArchiMer
Juteau, T; Eissen, Jp; Francheteau, J; Needham, David; Choukroune, P; Rangin, C; Seguret, M; Ballard, Rd; Fox, Pj; Normark, Wr; Carranza, A; Cordoba, D; Guerrero, J.
Fort y basaltic rocks collected by submersible during the "Cyamex" expedition (1978) on the East PacifIc Rise at 21 oN, a moderately fast spreading segment (6 cm/year opening rate) of the mid-ocean ridge, consist of angular pillow fragments and glass buds, sheet-flow slabs and samples of columnar pillars standing in collapsed fossillava pools. Most of the rocks are from the crestal are a of the Rise. The collection shows a striking petrographic homogeneity wh en compared with the range of basalts found on other segments of midocean ridges: olivine-phyric, or highly plagioclase-phyric rocks, so common in the slowspreading "Famous" are a in the Atlantic, are absent. All samples are typical lowpotassium oceanic tholeiites with a limited fractionation trend....
Tipo: Text Palavras-chave: Dorsale Est-PacifIque Pétrologie des basaltes sous-marins Coussins; Laves fluides; Piliers Générations de cristaux Globules de sulfure East Paciflc Rise Petrology of submarine basalts Pillows; Sheet flows; Pillars Generations of crystals Sulphide globules.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/00323/43430/43112.pdf
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Impact of lower plate structure on upper plate deformation at the NW Sumatran convergent margin from seafloor morphology ArchiMer
Graindorge, D; Klingelhoefer, Frauke; Sibuet, Jean-claude; Mcneill, L; Henstock, T; Dean, S; Gutscher, M; Dessa, J; Permana, H; Singh, S; Leau, H; White, N; Carton, H; Malod, Jacques-andre; Rangin, C; Aryawan, K; Chaubey, A; Chauhan, A; Galih, D; Greenroyd, C; Laesanpura, A; Prihantono, J; Royle, G; Shankar, U.
We present results from multibeam bathymetric data acquired during 2005 and 2006, in the region of maximum slip of the 26 Dec. 2004 earthquake (Mw 9.2). These data provide high-resolution images of seafloor morphology of the entire NW Sumatra forearc from the Sunda trench to the submarine volcanic arc just north of Sumatra. A slope gradient analysis of the combined dataset accurately highlights those portions of the seafloor shaped by active tectonic, depositional and/or erosional processes. The greatest slope gradients are located in the frontal 30 km of the forearc, at the toe of the accretionary wedge. This suggests that long-term deformation rates are highest here and that probably only minor amounts of slip are accommodated by other thrust faults...
Tipo: Text Palavras-chave: Sumatra; Tectonic; Seafloor morphology; Accretionary wedge; Subduction.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-5166.pdf
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Impact of oceanic asperities on the tectogenesis of modern convergent margins ArchiMer
Lallemand, S; Collot, J-y; Pelletier, B; Rangin, C; Cadet, J-p.
This paper presents some of the implications of oceanic asperities in subduction zones, based on examples gathered during the world circumnavigation of R/V Jean Charcot . The study of these examples provides a new overview of active margin modelling in response to asperity subduction. It is concluded that both erosion and accretion may be governed by the oceanic plate even though frontal tectonic erosion is better documented because it is accessible to conventional surveys. Most of the time, erosion is due to the relaxation of the arc slope in the wake of asperity/subduction.
Tipo: Text
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00268/37957/36038.pdf
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The axial ridge of the south china sea - a seabeam and geophysical survey ArchiMer
Pautot, G; Rangin, C; Briais, A; Wu, Jl; Han, Sq; Li, Hx; Lu, Yx; Zhao, Jc.
Tipo: Text
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00131/24234/22227.pdf
Registros recuperados: 8
Primeira ... 1 ... Última
 

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