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| Marjanovic, Milena; Singh, Satish C.; Gregory, Emma P. M.; Grevemeyer, Ingo; Growe, Kevin; Wang, Zhikai; Vaddineni, Venkata; Laurencin, Muriel; Carton, Helene; De La Pena, Laura Gomez; Filbrandt, Christian. |
| Oceanic transform faults and fracture zones (FZs) represent major bathymetric features that keep the records of past and present strike-slip motion along conservative plate boundaries. Although they play an important role in ridge segmentation and evolution of the lithosphere, their structural characteristics, and their variation in space and time, are poorly understood. To address some of the unknowns, we conducted interdisciplinary geophysical studies in the equatorial Atlantic Ocean, the region where some of the most prominent transform discontinuities have been developing. Here we present the results of the data analysis in the vicinity of the Chain FZ, on the South American Plate. The crustal structure across the Chain FZ, at the contact between... |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00690/80171/83239.pdf |
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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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| Hananto, Nugroho; Boudarine, Asmoune; Carton, Helene; Singh, Satish C.; Avianto, Praditya; Dyment, Jerome; Qin, Yanfang; Ghosal, Dibakar; Zuraida, Rina; Tapponnier, Paul E.; Deplus, Christine; Sieh, Kerry. |
| The Wharton Basin in the Indian Ocean is one of the most extensively deforming ocean basins, as confirmed by the occurrence of several very large earthquakes starting from January 12, 2012 with Mw 7.2 followed by the great earthquakes of April 11, 2012 with Mw 8.6 and Mw 8.2. Although the Mw 7.2 and Mw 8.2 earthquakes seem to have ruptured the re-activated N–S striking fracture zones, the largest event (Mw 8.6) required the rupturing of several faults, oblique to each other, in a very complex manner. In order to understand the nature of deformation in these earthquakes rupture zones, we recently acquired 90 000 km2 of bathymetry, 11 400 km of sub-bottom profiling, gravity and magnetic data covering the rupture areas of the 2012 earthquakes east of the... |
| Tipo: Text |
Palavras-chave: The 2012 Indian Ocean earthquake; Diffuse deformation; Wharton Basin; Plate bending; Shear zones; Normal faults. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00456/56738/58526.pdf |
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