Characteristics of magnetic fabrics in mass transport deposits in the Nankai Trough trench slope, Japan

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doi: 10.1007/978-3-319-00972-8_58
Author(s): Kitamura, Yujin; Strasser, Michael; Novak, Beth; Kanamatsu, Toshiya; Kawamura, Kiichiro; Zhao, Xixi
Author Affiliation(s): Primary:
University of Tokyo, Departmet of Earth and Planetary Science, Tokyo, Japan
Other:
GEOMAR Helmholtz Centre for Ocean Research, Germany
Institute of Marine Sciences, Spain
U. S. Geological Survey, United States
University of Bremen, Germany
Eidgenössische Technische Hochschule Zürich, Switzerland
Norwegian Geotechnical Institute, Norway
Western Washington University, United States
Japan Agency for Marine Earth Science and Technology, Japan
Yamaguchi University, Japan
University of California, Santa Cruz, United States
Volume Title: Submarine mass movements and their consequences; 6th international symposium
Volume Author(s): Krastel, Sebastian, editor; Behrmann, Jan-Hinrich; Völker, David; Stipp, Michael; Berndt, Christian; Urgeles, Roger; Chaytor, Jason; Huhn, Katrin; Strasser, Michael; Harbitz, Carl Bonnevie
Source: Advances in Natural and Technological Hazards Research, Vol.37, p.649-658; 6th international symposium on Submarine mass movements and their consequences, Kiel, Germany, Sept. 23-25, 2013, edited by Sebastian Krastel, Jan-Hinrich Behrmann, David Völker, Michael Stipp, Christian Berndt, Roger Urgeles, Jason Chaytor, Katrin Huhn, Michael Strasser and Carl Bonnevie Harbitz. Publisher: Springer, Dordrecht, Netherlands. ISSN: 1878-9897. ISBN: 978-3-319-00971-1
Note: In English. Based on Publisher-supplied data. 19 refs.
Summary: Submarine landslides are a potential risk to coastal areas all over the world. Studies of mass transport deposit (MTD) contribute to our understanding of the nature and process of submarine landslides. Scientific drilling provides material containing geological records of past landslide events. However, MTDs may not always be uniquely discernible by visual inspection. We applied magnetic fabric analysis to the drilled cores to examine the potential of magnetic fabrics for use in identifying MTDs. Among the sites drilled in the framework of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE), in Japan, of the Integrated Ocean Drilling Program (IODP), multiple occurrences of MTDs were observed in the recovered cores. We focused on the slope sediments in the footwall of the megasplay fault at Sites C0008 and C0018. The shape parameter (T) and the orientation of the axes of magnetic ellipsoids are distinctively scattered in MTDs at Site C0018. Downward increments in the lineation parameter (L) near the bottom of the MTDs may result from shear localization near the basal sliding plane. This, in combination with visual observation, suggests cohesive mass flow. By contrast, the results from sediments previously described as mass transport complexes at Site C0008 showed the opposite trend, suggesting a different process during transportation; i.e. the mass transport body evolved to become a complete debris flow. Our results show that magnetic fabric analysis is potent for describing MTDs and their internal structures. This finding may extend the methodology for describing MTDs and add to the discussion of the dynamic formation process.
Year of Publication: 2014
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 22 Environmental Geology; Asia; Expedition 316; Expedition 333; Far East; Faults; Geologic hazards; IODP Site C0008; IODP Site C0018; Integrated Ocean Drilling Program; Japan; Lithofacies; Magnetic properties; Magnetic susceptibility; Marine environment; Mass movements; NanTroSEIZE; Nankai Trough; Natural hazards; North Pacific; Northwest Pacific; Ocean floors; Orientation; Pacific Ocean; Paleomagnetism; Slope stability; Slumping; Submarine environment; Trenches; West Pacific
Coordinates: N331244 N331249 E1364340 E1364336
N330925 N330925 E1364053 E1364053
Record ID: 2015066241
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