|
|
|
| Registros recuperados: 64 | |
|
|
| Hsu, Shu-kun; Sibuet, Jean-claude. |
| The 26 December 2004 earthquake off Sumatra induced a disastrous tsunami that struck in South Asian countries. In a similar context, a potential great earthquake off Japan might occur and generate a strong tsunami in East Asia. The 2004 Sumatra earthquake is the second biggest earthquake (Mw = 9.3) recorded during the last century. It occurred at a depth of 20–30 km, close to an indentation of the Indonesian forearc (Figure l). The rupture propagated about 1200 km northward and terminated north of Andaman Islands. |
| Tipo: Text |
|
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/00451/56258/57827.pdf |
| |
|
|
| Klingelhoefer, Frauke; Lee, Chao-shing; Lin, Jing-yi; Sibuet, Jean-claude. |
| During a passive seismic experiment in the Okinawa Trough the shots of two reflection profiles were recorded by ocean bottom seismometers (OBS). Both profiles include 3 ocean-bottom instruments, are about 65 km in length and located in the axial portion of the southwestern Okinawa Trough. Processing of the reflection seismic data images recent deformation of the sedimentary units. Forward modelling of the wide-angle data on both profiles reveals a 1-2 km thick sedimentary infill overlying an acoustic basement characterised by seismic velocities between 3.2 and 3.5 km/s. Crustal thickness could only be modelled on one profile and was determined to be around 10 km, thickening towards the Ryukyu Arc in the south. Gravity modelling was used to additionally... |
| Tipo: Text |
Palavras-chave: Back arc basin; Crustal structure; Wide angle seismics; Okinawa Trough. |
| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/2009/publication-6414.pdf |
| |
|
| |
|
|
| Sibuet, Jean-claude; Ryan, William B.f.. |
| DSDP Site 398 is located on the West Iberian passive continental margin, south of Galicia Bank, 20 km to the south of Vigo Seamount (Figure 1).The kinematic evolution of the Iberian plate is closely controlled by the relative motions of the African, European, and North American plates. A study based on magnetic data and land data was undertaken to better define the relative motion of Iberia with respect to these main plates (Sibuet et al; in preparation).Trapped between these plates, microcontinents such as Galicia Bank and Flemish Cap (located between Iberia and North America) assumed their own relative motions with respect to Iberia and North America during the early evolution of the North Atlantic.Consequently, the initial oceanic circulation between... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/1979/publication-5269.pdf |
| |
|
|
| Sibuet, Jean-claude; He, Enyuan; Zhao, Minghui; Pang, Xinming; Klingelhoefer, Frauke. |
| In the late 90's, some faults identified within oceanic crust were demonstrated to be artifacts arising from out-of-plane scattering along linear sediment-buried fault scarps. Symmetrical mantle reflections observed southwest northern Sumatra on seismic reflection profiles have been identified as faults cutting through the upper mantle down to unprecedented depths reaching similar to 45 km. Seawater being conveyed along sub-vertical re-activated fracture zones (FZs) to the upper mantle, the mantle portions of FZs are serpentinized and act as mirrors for seismic rays. We suggest that the mantle features are not faults but artifacts resulting from out-of-plane reflections on these mirrors. Two perpendicular seismic profiles crossing the same FZ display two... |
| Tipo: Text |
|
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00516/62771/67173.pdf |
| |
|
|
| Sibuet, Jean-claude. |
| The detailed interpretation of gravimetric surveys implies a good knowledge of the superficial geology, at least in specific spots such as the basement's outcrops. We now have a geological sketch map as well as an estimate of the thickness of the sedimentary series of the continental shelf off the coasts of Brittany. As a consequence, it is now possible to try and interpret the new map of this region's gravimetric anomalies, based on the terrestrial and marine geological data. |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1972 |
URL: http://archimer.ifremer.fr/doc/1972/publication-5051.pdf |
| |
|
|
| Hsu, Shu-kun; Liu, Char-shine; Shyu, Chuen-tien; Liu, Shao-yung; Sibuet, Jean-claude; Lallemand, Serge; Wang, Chensung; Reed, Donald. |
| We have compiled new free-air gravity anomaly (FAA) and magnetic anomaly maps, shedding light on the tectonics in the Taiwan-Luzon region. To have a suitable datum level for both the available gravity and magnetic anomaly data, the set of data from an ACT cruise, conducted during May 27 to June 21, 1996, was chosen as a reference. Based on the cross-over error analysis, all the other data were adjusted accordingly. Some satellite-derived, airborne or land data were also added to the compilation to obtain better coverage. Several major new insights into the Taiwan-Luzon region are revealed by the new maps. (1) A prominent NE-SW trending belt of gravity and magnetic anomalies is present in the onshore and offshore areas of southwestern Taiwan. The Peikang... |
| Tipo: Text |
Palavras-chave: Free-air gravity anomaly; Bouguer anomaly; Magnetic anomaly; Transverse ridge; Fracture zone; Transform fault; Taiwan. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00447/55859/58057.pdf |
| |
|
|
| Auzende, Jean Marie; Boespflug, X; Bougault, Henri; Dosso, Laure; Foucher, Jean-paul; Joron, J-l; Ruellan, Etienne; Sibuet, Jean-claude. |
| Three cruises (POP 1, SEAPSO 3 and SEAPSO 4) carried out during the "Tour du Monde" of the R.V. Jean Charcot allow us to obtain new structural and geochemical data for the Okinawa, North Fiji and Lau basins. Taken together, the structural and geochemical data illustrate a difference in evolution stages of these sites. The less evolved stage is represented by the Okinawa basin, where accretion is evidence only by volcanic intrusion into a thinned continental crust. The most evolved stage is illustrated in the North Fiji basin, where the present-day accretion can be directly compared to the East Pacific Ridge. The Lau basin displays an intermediate stage with a complex system of accretionary ridges. This difference in the evolution stage is translated in the... |
| Tipo: Text |
|
| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37893/35974.pdf |
| |
|
|
| Louvel, Veronique; Dyment, Jerome; Sibuet, Jean-claude. |
| The deep seismic reflection profile Western Approaches Margin (WAM) cuts across the Goban Spur continental margin, located southwest of Ireland. This non-volcanic margin is characterized by a few tilted blocks parallel to the margin. A volcanic sill has been emplaced on the westernmost tilted block. The shape of the eastern part of this sill is known from seismic data, but neither seismic nor gravity data allow a precise determination of the extent and shape of the volcanic body at depth. Forward modelling and inversion of magnetic data constrain the shape of this volcanic sill and the location of the ocean-continent transition. The volcanic body thickens towards the ocean, and seems to be in direct contact with the oceanic crust. In the contact zone, the... |
| Tipo: Text |
Palavras-chave: Continental margin; Goban Spur; Magnetic anomalies; Ocean-continent boundary. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00337/44777/44601.pdf |
| |
|
|
| Goslin, J.; Mascle, Jean; Sibuet, Jean-claude; Hosking, H.. |
| The landward termination of Walvis Ridge consists of two east-trending basement ridges of probable basaltic composition enclosing a relatively important sedimentary basin. East of long. 10° E., the southern ridge disappears under the sediments of the continental margin. The trends of the basement ridges are in good agreement with the inferred direction of initial opening. Since its formation, the Walvis Ridge has probably dammed sediment coming from the south. The proposed identification of layer A, a very strong horizon over which the reflectors are nearly undisturbed, may indicate that no major tectonic phase has affected this area since the shift of the pole of opening for the south Atlantic in Late Cretaceous-early Tertiary time. [NOT CONTROLLED OCR] |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1974 |
URL: http://archimer.ifremer.fr/doc/1974/publication-5147.pdf |
| |
|
|
| 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 |
| |
|
|
| Sibuet, Jean-claude; Rouzo, Stephane; Srivastava, Shiri. |
| We have established a new plate kinematic model of the central and North Atlantic oceans between North America, Africa, Meseta, Iberia, Flemish Cap, and Galicia Bank from Late Triassic to Late Cretaceous to better understand the nature and timing of rifting of Nova Scotia and Morocco conjugate continental margins since Late Triassic. The maps of salt distributions at the Sinemurian-Pliensbachian limit (190 Ma; after salt deposition) and in middle Bajocian (170 Ma) show that an area of the Nova Scotia margin is devoid of allochthonous salt and that an area of similar size located oceanward of the West African Coast Magnetic Anomaly shows salt deposits, suggesting that a portion of the Nova Scotia margin with its overlying salt deposits could have been... |
| Tipo: Text |
|
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00117/22805/20913.pdf |
| |
|
|
| Sibuet, Jean-claude. |
| Il y a environ 200 m. a. (millions d'années), le golfe de Gascogne n'existait pas ; les rebords des plateaux continentaux du nord de la péninsule ibérique et de l'Europe étaient jointifs. Bien que des cassures se soient produites dès la fin du Trias (200 m. a.), le mouvement d'ouverture du golfe de Gascogne aurait commencé dès la fin du Jurassique (136 m. a.) pour se terminer au Crétacé supérieur (80 m. a.). La péninsule ibérique aurait subi, par rapport à l'Europe, une rotation d'environ 23 degrés autour d'un pôle situé près de Paris. Du Crétacé supérieur à l'Eocène supérieur (38 m. a.) un mouvement de compression d'une cinquantaine de km d'amplitude, entre la péninsule ibérique et l'Europe stable, serait responsable de la formation des Pyrénées et... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1974 |
URL: http://archimer.ifremer.fr/doc/1974/publication-5134.pdf |
| |
|
|
| Lin, Jing-yi; Sibuet, Jean-claude; Hsu, S. |
| Using earthquakes relocated in north-east Taiwan, we estimated b-value distribution along a cross-section located near the Ryukyu slab edge, and four b-value anomalous areas are evidenced: (1) a high b-value body lying on top of a low Vp, low Vs and high Vp/Vs sausage-like body was considered as a region of enhanced partial melt or water supply above which seismicity occurs; (2) beneath the Ilan Plain, an anomalous area characterized by b-values slightly higher than 1.1 might give evidence to the magma conduits to the Kueishantao Island; (3) above the Ryukyu Wadati-Benioff zone, at depths ranging from 90 to 110 km, a high b-value anomaly might correspond to the depth where dehydration occurs in the subducting oceanic plate; and (4) a low b-value area... |
| Tipo: Text |
|
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4119.pdf |
| |
|
| |
|
| |
|
| |
|
|
| Whitmarsh, Robert B; White, Robert S; Horsefield, Susan J; Sibuet, Jean-claude; Recq, Maurice; Louvel, Veronique. |
| A seismic refraction transect across the Galicia Bank continental margin shows that the original continental crust thins westward from 17 to 2 km immediately east of a margin-parallel peridotite ridge (PR). immediately west of the PR, oceanic crust is only 2.5-3.5 km thick, but farther west (oceanward) it thickens to 7 km. The PR caps a similar to 60-km-wide lens-shaped serpentinized peridotite body underlying both thinned continental and thin oceanic crust. When superimposed on a reflection time version of the velocity model, the S reflector is clearly intracrustal at its east end. Westward, S cuts down to lower crustal levels, eventually coinciding with the top of the serpentinized peridotite lens (original crust-mantle boundary). These observations... |
| Tipo: Text |
|
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00281/39255/43277.pdf |
| |
|
|
| Sibuet, Jean-claude; Hsu, Shu-kun; Normand, Alain. |
| Since the beginning of formation of Proto-Taiwan, the subducting Philippine (PH) Sea plate has moved continuously through time in the N307° direction with respect to Eurasia (EU), tearing the EU plate. The subducting EU plate includes a continental part in the north and an oceanic part in the south. The boundary B between these two domains corresponds to the eastern prolongation of the northeastern South China Sea ocean-continent transition zone. In the Huatung Basin (east of Taiwan), the Taitung Canyon is N065° oriented and is close and parallel to B. Seismic profiles show that the southern flank of the canyon corresponds to a fault with a normal component of a few tens of meters in the sediments and possible dextral shearing. Several crustal earthquakes... |
| Tipo: Text |
Palavras-chave: Underlying slab deformation along trasition zone; Slip fault; Right lateral strike; Taitung Canyon. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-3035.pdf |
| |
| Registros recuperados: 64 | |
|
|
|
