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| Chauhan, Ajay P. S.; Singh, Satish C.; Hananto, Nugroho D.; Carton, Helene; Klingelhoefer, Frauke; Dessa, J. -x.; Permana, H.; White, N. J.; Graindorge, D.. |
| 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 at convergent margins. However, several critical details of the structure, mode of tectonic evolution and the role forearcs play in the subduction seismic cycle remain to be further understood, especially for large accretionary margins. In this study, we present a high-resolution deep seismic reflection image of the northern Sumatran subduction forearc, near the 2004 December 26 Sumatra earthquake epicentral region. The profile clearly demarcates the backthrust branches at the seaward edge of the Aceh forearc basin, along which... |
| Tipo: Text |
Palavras-chave: Forearc backthrusting; Seismic reflection image; Seismic tomography; Subduction zone processes. |
| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/00000/11120/7720.pdf |
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| Cochran, James R.. |
| The Andaman Sea has developed as the result of highly oblique subduction at the western Sunda Trench, leading to partitioning of convergence into trench-perpendicular and trench-parallel components and the formation of a northward-moving sliver plate to accommodate the trench parallel motion. The Andaman forearc contains structures resulting from both components of motion. The main elements of the forearc are the accretionary prism and outerarc ridge, a series of forearc basins and major N-S faults. The accretionary prism is an imbricate stack of fault slices and folds consisting of ophiolites and sediments scrapped off the subducting Indian Plate. The western, outer slope of the accretionary prism is very steep, rising to depths of 1500-2000 m within a... |
| Tipo: Text |
Palavras-chave: Seismicity and tectonics; Subduction zone processes; Continental tectonics; Strike-slip and transform; Indian Ocean. |
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00231/34191/32773.pdf |
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| Ghosal, Dibakar; Singh, S. C.; Martin, J.. |
| In subduction zones, shallow subsurface structures are the manifestation of the plate interactions at depth. However, significant water depths, rough bathymetry and presence of heavily deformed accretionary wedge materials hamper imaging of the near-surface features to a great extent using conventional imaging techniques. In this study, we show results using an integrated processing technique to a multichannel seismic data set acquired in 2006 from the northwestern offshore Sumatra. We start with first downward continuing the 12-km-long surface streamer data to the seafloor, followed by a high-resolution traveltime tomography of refracted phases to determine a detailed velocity-depth model of subsurface, which in turns, is used for pre-stack depth... |
| Tipo: Text |
Palavras-chave: Controlled source seismology; Seismic tomography; Subduction zone processes; Continental margins: convergent; Folds and folding. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40094/39185.pdf |
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