Structure and Composition of the Plate-Boundary Slip Zone for the 2011 Tohoku-Oki Earthquake.

Chester, F. M., Rowe, C., Ujiie, K., Kirkpatrick, J., Regalla, C., Remitti, F., Moore, J. C., Toy, V., Wolfson-Schwehr, M., Bose, S., Kameda, J., Mori, J. J., Brodsky, E. E., Eguchi, N., Toczko, S., Anderson, L., Behrmann, Jan H. , Conin, M., Cook, B., Fulton, P., Hirose, T., Ikari, M., Ishikawa, T., Jeppson, T., Lin, W., Mishima, Toshiaki, Motoyama, I., Nakamura, Y., Sample, J., Sun, T., Takai, K., Yang, T., Kodaira, S., Maeda, L., Kido, Y., Saito, S. and Sanada, Y. and Expedition 343 and 343T Scientists (2013) Structure and Composition of the Plate-Boundary Slip Zone for the 2011 Tohoku-Oki Earthquake. Science, 342 (6163). pp. 1208-1211. DOI 10.1126/science.1243719.

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Abstract

The mechanics of great subduction earthquakes are influenced by the frictional properties, structure, and composition of the plate-boundary fault. We present observations of the structure and composition of the shallow source fault of the 2011 Tohoku-Oki earthquake and tsunami from boreholes drilled by the Integrated Ocean Drilling Program Expedition 343 and 343T. Logging-while-drilling and core-sample observations show a single major plate-boundary fault accommodated the large slip of the Tohoku-Oki earthquake rupture, as well as nearly all the cumulative interplate motion at the drill site. The localization of deformation onto a limited thickness (less than 5 meters) of pelagic clay is the defining characteristic of the shallow earthquake fault, suggesting that the pelagic clay may be a regionally important control on tsunamigenic earthquakes.

Document Type: Article
Additional Information: Additional Author Notes Expedition 343 and 343T Scientists include: Louise Anderson, Jan H. Behrmann, Marianne Conin, Becky Cook, Patrick Fulton, Takehiro Hirose, Matt Ikari, Tsuyoshi Ishikawa, Tamara Jeppson, Weiren Lin, Toshiaki Mishima, Isao Motoyama, Yasuyuki Nakamura, James Sample, Tianhaozhe Sun, Ken Takai, Tao Yang, Shuichi Kodaira, Lena Maeda, Yukari Kido, Saneatsu Saito, Yoshinori Sanada
Keywords: IODP, Expedition 343, earthquake, Tohoku, Japan, fault, structure, claystone, accretion, subduction
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1126/science.1243719
ISSN: 0036-8075
Projects: Future Ocean
Expeditions/Models/Experiments:
Date Deposited: 18 Dec 2013 10:57
Last Modified: 09 Sep 2016 11:25
URI: http://oceanrep.geomar.de/id/eprint/22653

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