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3-D active source tomography around Simeulue Island offshore Sumatra: Thick crustal zone responsible for earthquake segment boundary ArchiMer
Tang, Genyang; Barton, Penny J.; Mcneill, Lisa C.; Henstock, Timothy J.; Tilmann, Frederik; Dean, Simon M.; Jusuf, Muhammad D.; Djajadihardja, Yusuf S.; Permana, Haryadi; Klingelhoefer, Frauke; Kopp, Heidrun.
We present a detailed 3-D P-wave velocity model obtained by first-arrival travel-time tomography with seismic refraction data in the segment boundary of the Sumatra subduction zone across Simeulue Island, and an image of the top of the subducted oceanic crust extracted from depth-migrated multi-channel seismic reflection profiles. We have picked P-wave first arrivals of the air-gun source seismic data recorded by local networks of ocean-bottom seismometers, and inverted the travel-times for a 3-D velocity model of the subduction zone. This velocity model shows an anomalous zone of intermediate velocities between those of oceanic crust and mantle that is associated with raised topography on the top of the oceanic crust. We interpret this feature as a...
Tipo: Text Palavras-chave: Active-source tomography; Sumatra subduction zone; Segmentation; Plate interface.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00137/24834/22916.pdf
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High-resolution record reveals climate-driven environmental and sedimentary changes in an active rift ArchiMer
Mcneill, Lisa C.; Shillington, Donna J.; Carter, Gareth D. O.; Everest, Jeremy D.; Gawthorpe, Robert L.; Miller, Clint; Phillips, Marcie P.; Collier, Richard E. Ll; Cvetkoska, Aleksandra; De Gelder, Gino; Diz, Paula; Mai-linh Doan,; Ford, Mary; Geraga, Maria; Gillespie, Jack; Hemelsdael, Romain; Herrero-bervera, Emilio; Ismaiel, Mohammad; Janikian, Liliane; Kouli, Katerina; Le Ber, Erwan; Li, Shunli; Maffione, Marco; Mahoney, Carol; Machlus, Malka L.; Michas, Georgios; Nixon, Casey W.; Oflaz, Sabire Asli; Omale, Abah P.; Panagiotopoulos, Kostas; Pechlivanidou, Sofia; Sauer, Simone; Seguin, Joana; Sergiou, Spyros; Zakharova, Natalia, V; Green, Sophie.
Young rifts are shaped by combined tectonic and surface processes and climate, yet few records exist to evaluate the interplay of these processes over an extended period of early rift-basin development. Here, we present the longest and highest resolution record of sediment flux and paleoenvironmental changes when a young rift connects to the global oceans. New results from International Ocean Discovery Program (IODP) Expedition 381 in the Corinth Rift show 10s-100s of kyr cyclic variations in basin paleoenvironment as eustatic sea level fluctuated with respect to sills bounding this semi-isolated basin, and reveal substantial corresponding changes in the volume and character of sediment delivered into the rift. During interglacials, when the basin was...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00485/59635/62661.pdf
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