Seismic slip propagation to the updip end of plate boundary subduction interface faults; vitrinite reflectance geothermometry on Integrated Ocean Drilling Program NanTro SEIZE cores

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doi: 10.1130/G31642.1
Author(s): Sakaguchi, Arito; Chester, Frederick; Curewitz, Daniel; Fabbri, Olivier; Goldsby, David; Kimura, Gaku; Li Chunfeng; Masaki, Yuka; Screaton, Elizabeth J.; Tsutsumi, Akito; Ujiie, Kohtaro; Yamaguchi, Asuka
Author Affiliation(s): Primary:
Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Institute for Frontier Research on Earth Evolution (FREE), Kanagawa, Japan
Texas A&M University, United States
Syracuse University, United States
Université de Franche-Comté, France
Brown University, United States
University of Tokyo, Japan
Tongji University, China
Kochi University, Japan
University of Florida, United States
Kyoto University, Japan
Tsukuba University, Japan
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 39(4), p.395-398. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. With GSA Data Repository Item 2011126. 19 refs.; illus., incl. sect., sketch map
Summary: Seismic faulting along subduction-type plate boundaries plays a fundamental role in tsunami genesis. During the Integrated Ocean Drilling Program (IODP) Nankai Trough Seismogenic Zone Experiment (NanTro SEIZE) Stage 1, the updip ends of plate boundary subduction faults were drilled and cored in the Nankai Trough (offshore Japan), where repeated large earthquakes and tsunamis have occurred, including the A.D. 1944 Tonankai (Mw=8.1) earthquake. Samples were obtained from the frontal thrust, which connects the deep plate boundary to the seafloor at the toe of the accretionary wedge, and from a megasplay fault that branches from the plate boundary decollement. The toe of the accretionary wedge has classically been considered aseismic, but vitrinite reflectance geothermometry reveals that the two examined fault zones underwent localized temperatures of more than 380°C. This suggests that frictional heating occurred along these two fault zones, and implies that coseismic slip must have propagated at least one time to the updip end of the megasplay fault and to the toe of the accretionary wedge.
Year of Publication: 2011
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; Accretionary wedges; Cores; Coseismic processes; Decollement; Displacements; Earthquakes; Faults; Friction; Geologic hazards; Geologic thermometry; IODP Site C0004; Integrated Ocean Drilling Program; NanTroSEIZE; Nankai Trough; Natural hazards; North Pacific; Northwest Pacific; Pacific Ocean; Plate boundaries; Plate tectonics; Seismotectonics; Subduction; Tectonics; Thrust faults; Tsunamis; Vitrinite reflectance; West Pacific
Coordinates: N331300 N331300 E1364300 E1364300
Record ID: 2011038856
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