IODP Expedition 319, NanTroSEIZE stage 2; first IODP riser drilling operations and observatory installation towards understanding subduction zone seismogenesis

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doi: 10.2204/iodp.sd.10.01.2010
Author(s): McNeill, Lisa; Saffer, Demian; Byrne, Tim; Araki, Eiichiro; Toczko, Sean; Eguchi, Nobu; Takahashi, Kyoma
Integrated Ocean Drilling Program, Expedition 319 Scientists, College Station, TX
Author Affiliation(s): Primary:
University of Southampton, National Oceanography Centre, Southampton, United Kingdom
Other:
Pennsylvania State University, United States
University of Connecticut, United States
Japan Agency for Marine-Earth Science and Technology, Japan
Volume Title: Scientific Drilling
Source: Scientific Drilling, Vol.10, p.4-13. Publisher: Integrated Ocean Drilling Program Management International, Sapporo; Washington, DC, International. ISSN: 1816-8957
Note: In English. 28 refs.; illus., incl. sect., geol. sketch map
Summary: The Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) is a major drilling project designed to investigate fault mechanics and the seismogenic behavior of subduction zone plate boundaries. Expedition 319 is the first riser drilling operation within scientific ocean drilling. Operations included riser drilling at Site C0009 in the forearc basin above the plate boundary fault, non-riser drilling at Site C0010 across the shallow part of the megasplay fault system--which may slip during plate boundary earthquakes - and initial drilling at Site C0011 (incoming oceanic plate) for Expedition 322. At Site C0009, new methods were tested, including analysis of drill mud cuttings and gas, and in situ measurements of stress, pore pressure, and permeability. These results, in conjunction with earlier drilling, will provide a) the history of forearc basin development (including links to growth of the megasplay fault system and modern prism), b) the first in situ hydrological measurements of the plate boundary hanging wall, and c) integration of in situ stress measurements (orientation and magnitude) across the forearc and with depth. A vertical seismic profile (VSP) experiment provides improved constraints on the deeper structure of the subduction zone. At Site C0010, logging-while-drilling measurements indicate significant changes in fault zone and hanging wall properties over short (<5 km) along-strike distances, suggesting different burial and/or uplift history. The first borehole observatory instruments were installed at Site C0010 to monitor pressure and temperature within the megasplay fault zone, and methods of deployment of more complex observatory instruments were tested for future operations.
Year of Publication: 2010
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; 19 Geophysics, Seismology; 20 Geophysics, Applied; Active margins; Asia; Basins; Boreholes; Continental margin; Cores; Crust; Drilling; Earthquakes; Eurasian Plate; Expedition 319; Far East; Faults; Fore-arc basins; Geophysical methods; Geophysical profiles; Geophysical surveys; Honshu; IODP Site C0009; IODP Site C0010; Integrated Ocean Drilling Program; Japan; Kii Peninsula; Marine drilling; Marine sediments; Megasplay faults; NanTroSEIZE; Nankai Trough; North Pacific; Northwest Pacific; Oceanic crust; Pacific Ocean; Philippine Sea Plate; Physical properties; Plate boundaries; Plate tectonics; Programs; Sediments; Seismic methods; Seismic profiles; Stress; Subduction zones; Surveys; Well logs; West Pacific
Coordinates: N332728 N332728 E1363209 E1363209
N331236 N331236 E1364112 E1364112
Record ID: 2011000997
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