K
Kohtaro Ujiie
Researcher at University of Tsukuba
Publications - 91
Citations - 3191
Kohtaro Ujiie is an academic researcher from University of Tsukuba. The author has contributed to research in topics: Slip (materials science) & Subduction. The author has an hindex of 32, co-authored 85 publications receiving 2736 citations. Previous affiliations of Kohtaro Ujiie include University of California, San Diego & Japan Agency for Marine-Earth Science and Technology.
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Journal ArticleDOI
Low Coseismic Shear Stress on the Tohoku-Oki Megathrust Determined from Laboratory Experiments
Kohtaro Ujiie,Kohtaro Ujiie,Hanae Tanaka,Tsubasa Saito,Akito Tsutsumi,Jim Mori,Jun Kameda,Emily E. Brodsky,Frederick M. Chester,Nobuhisa Eguchi,Sean Toczko,Expedition,T Scientists +12 more
TL;DR: High-velocity friction experiments on samples retrieved from the plate-boundary thrust associated with the Tohoku-Oki earthquake show a small stress drop with very low peak and steady-state shear stress, which provides an explanation for the huge shallow slip that occurred during the earthquake.
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Structure and composition of the plate-boundary slip zone for the 2011 Tohoku-Oki earthquake.
Frederick M. Chester,Christie D. Rowe,Kohtaro Ujiie,James D. Kirkpatrick,Christine Regalla,Francesca Remitti,J. Casey Moore,Virginia Toy,M. Wolfson-Schwehr,Santanu Bose,Jun Kameda,Jim Mori,Emily E. Brodsky,Nobuhisa Eguchi,Sean Toczko,Expedition,T Scientists +16 more
TL;DR: Observations from boreholes drilled by the Integrated Ocean Drilling Program Expedition 343 and 343T 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.
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New insights into deformation and fluid flow processes in the Nankai Trough accretionary prism: Results of Ocean Drilling Program Leg 190
Gregory F. Moore,Asahiko Taira,Adam Klaus,Luann Becker,Babette Boeckel,Barry Andrew Cragg,Allison Dean,Christopher L. Fergusson,Pierre Henry,Satoshi Hirano,Toshio Hisamitsu,Sabine Hunze,Miriam Kastner,Alex J. Maltman,Julia K. Morgan,Yuki Murakami,Demian M. Saffer,Mario Sánchez-Gómez,Elizabeth J. Screaton,David C. Smith,Arthur J. Spivack,Joan Steurer,Harold Tobin,Kohtaro Ujiie,Michael B. Underwood,Moyra E.J. Wilson +25 more
TL;DR: Moore et al. as mentioned in this paper presented new insights into deformation and fluid flow processes in the Nankai Trough accretionary prism, using the results of Ocean Drilling Program Leg 190.
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Seismic slip propagation to the updip end of plate boundary subduction interface faults: Vitrinite reflectance geothermometry on Integrated Ocean Drilling Program NanTro SEIZE cores
Arito Sakaguchi,Frederick M. Chester,Daniel Curewitz,Olivier Fabbri,David L. Goldsby,Gaku Kimura,Chun-Feng Li,Yuka Masaki,Elizabeth J. Screaton,Akito Tsutsumi,Kohtaro Ujiie,Asuka Yamaguchi +11 more
TL;DR: In this article, 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.
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Transition of accretionary wedge structures around the up-dip limit of the seismogenic subduction zone
Gaku Kimura,Gaku Kimura,Yujin Kitamura,Yoshitaka Hashimoto,Asuka Yamaguchi,Tadahiro Shibata,Kohtaro Ujiie,Shin'ya Okamoto +7 more
TL;DR: In this article, the Nankai prism is divided into three segments: outer and inner wedges and their transition zone, which reflect different aspects of wedge taper, internal deformation, and basal plate boundary fault.