Expedition 362 summary

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doi: 10.14379/iodp.proc.362.101.2017
Author(s): McNeill, Lisa C.; Dugan, Brandon; Petronotis, Katerina E.; Backman, Jan; Bourlange, Sylvain; Chemale, Farid, Jr.; Chen Wenhuang; Colson, Tobias A.; Frederik, Marina C. G.; Guèrin, Gilles; Hamahashi, Mari; Henstock, Timothy; House, Brian M.; Hüpers, Andre; Jeppson, Tamara N.; Kachovich, Sarah; Kenigsberg, Abby R.; Kuranaga, Mebae; Kutterolf, Steffen; Milliken, Kitty L.; Mitchison, Freya L.; Mukoyoshi, Hideki; Nair, Nisha; Owari, Satoko; Pickering, Kevin T.; Pouderoux, Hugo F. A.; Shan Yehua; Song, Insun; Torres, Marta E.; Vannucchi, Paola; Vrolijk, Peter J.; Yang Tao; Zhao, Xixi
International Ocean Discovery Program, Expedition 362 scientists, College Station, TX
Author Affiliation(s): Primary:
University of Southampton, National Oceanography Centre, Southampton, United Kingdom
Other:
Colorado School of Mines, United States
Texas A&M University, United States
Stockholm University, Sweden
Ecole National Supérieure de Géologie, France
Universidade do Vale do Rio dos Sinos, Brazil
Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, China
University of Western Australia, Australia
Agency for the Assessment and Application of Technology, Indonesia
Volume Title: Proceedings of the International Ocean Discovery Program; Sumatra subduction zone; Expedition 362 of the riserless drilling platform, Colombo, Sri Lanka, to Singapore; Sites U1480-U1481, 6 August-6 October 2016
Volume Author(s): McNeill, Lisa C.; Dugan, Brandon; Petronotis, Katerina E.; Backman, Jan; Bourlange, Sylvain; Chemale, Farid, Jr.; Chen Wenhuang; Colson, Tobias A.; Frederik, Marina C. G.; Guèrin, Gilles; Hamahashi, Mari; Henstock, Timothy; House, Brian M.; Hüpers, Andre; Jeppson, Tamara N.; Kachovich, Sarah; Kenigsberg, Abby R.; Kuranaga, Mebae; Kutterolf, Steffen; Milliken, Kitty L.; Mitchison, Freya L.; Mukoyoshi, Hideki; Nair, Nisha; Owari, Satoko; Pickering, Kevin T.; Pouderoux, Hugo F. A.; Shan Yehua; Song, Insun; Torres, Marta E.; Vannucchi, Paola; Vrolijk, Peter J.; Yang Tao; Zhao, Xixi
Source: Proceedings of the International Ocean Discovery Program; Sumatra subduction zone; Expedition 362 of the riserless drilling platform, Colombo, Sri Lanka, to Singapore; Sites U1480-U1481, 6 August-6 October 2016, Lisa C. McNeill, Brandon Dugan, Katerina E. Petronotis, Jan Backman, Sylvain Bourlange, Farid Chemale, Jr., Chen Wenhuang, Tobias A. Colson, Marina C. G. Frederik, Gilles Guèrin, Mari Hamahashi, Timothy Henstock, Brian M. House, Andre Hüpers, Tamara N. Jeppson, Sarah Kachovich, Abby R. Kenigsberg, Mebae Kuranaga, Steffen Kutterolf, Kitty L. Milliken, Freya L. Mitchison, Hideki Mukoyoshi, Nisha Nair, Satoko Owari, Kevin T. Pickering, Hugo F. A. Pouderoux, Shan Yehua, Insun Song, Marta E. Torres, Paola Vannucchi, Peter J. Vrolijk, Yang Tao and Xixi Zhao; International Ocean Discovery Program, Expedition 362 scientists, College Station, TX. Proceedings of the International Ocean Discovery Program, Expedition Reports, Vol.362, 20p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 2377-3189 CODEN: IDSDA6
Note: In English. 67 refs.; illus., incl. sects., 1 table, geol. sketch map
Summary: Drilling the input materials of the north Sumatran subduction zone, part of the 5000 km long Sunda subduction zone system and the origin of the Mw ∼9.2 earthquake and tsunami that devastated coastal communities around the Indian Ocean in 2004, was designed to groundtruth the material properties causing unexpectedly shallow seismogenic slip and a distinctive forearc prism structure. The intriguing seismogenic behavior and forearc structure are not well explained by existing models or by relationships observed at margins where seismogenic slip typically occurs farther landward. The input materials of the north Sumatran subduction zone are a distinctively thick (as thick as 4-5 km) succession of primarily Bengal-Nicobar Fan-related sediments. The correspondence between the 2004 rupture location and the overlying prism plateau, as well as evidence for a strengthened input section, suggest the input materials are key to driving the distinctive slip behavior and long-term forearc structure. During Expedition 362, two sites on the Indian oceanic plate ∼250 km southwest of the subduction zone, Sites U1480 and U1481, were drilled, cored, and logged to a maximum depth of 1500 meters below seafloor. The succession of sediment/rocks that will develop into the plate boundary detachment and will drive growth of the forearc were sampled, and their progressive mechanical, frictional, and hydrogeological property evolution will be analyzed through postcruise experimental and modeling studies. The large penetration depths with good core recovery and successful wireline logging in the challenging submarine fan materials will enable evaluation of the role of thick sedimentary subduction zone input sections in driving shallow slip and amplifying earthquake and tsunami magnitudes at the Sunda subduction zone and globally at other subduction zones where submarine fan-influenced sections are being subducted.
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 20 Geophysics, Applied; Algae; Asia; Bengal Fan; Biostratigraphy; Cenozoic; Cores; Cretaceous; Diatoms; Far East; Foraminifera; Geophysical methods; Geophysical profiles; Geophysical surveys; IODP Site U1480; IODP Site U1481; Indian Ocean; Indonesia; Invertebrata; Lithostratigraphy; Magnetostratigraphy; Marine sediments; Mesozoic; Microfossils; Nannofossils; Nicobar Fan; Physical properties; Plantae; Protista; Quaternary; Radiolaria; Sedimentary rocks; Sediments; Seismic methods; Seismic profiles; Seismic stratigraphy; Silicoflagellata; Subduction zones; Sumatra; Surveys; Tertiary; Upper Cretaceous; Well logs
Coordinates: N030202 N030202 E0913621 E0913621
N024517 N024517 E0914535 E0914535
Record ID: 2017087789
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute.
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