Frontal wedge deformation near the source region of the 2011 Tohoku-Oki earthquake
Yoshihiro Ito,Takeshi Tsuji,Yukihito Osada,Motoyuki Kido,Daisuke Inazu,Yutaka Hayashi,Hiroaki Tsushima,Ryota Hino,Hiromi Fujimoto +8 more
TLDR
In this paper, an ocean-bottom pressure gauge was installed before the 2011 Tohoku-Oki earthquake on a frontal wedge, which formed an uplift system near the Japan Trench.Abstract:
[1] We report an uplift of 5 m with a horizontal displacement of more than 60 m due to the 2011 Tohoku-Oki earthquake. The uplift was measured by an ocean-bottom pressure gauge installed before the earthquake on a frontal wedge, which formed an uplift system near the Japan Trench. Horizontal displacements of the frontal wedge were measured using local benchmark displacements obtained by acoustic ranging before and after the earthquake. The average displacements at the frontal wedge were 58 m east and 74 m east-southeast. These results strongly suggest a huge coseismic slip beneath the frontal wedge on the plate boundary. The estimated magnitude of the slip along the main fault was 80 m near the trench. Our results suggest that the horizontal and vertical deformations of the frontal wedge due to the slip generated the tremendous tsunami that struck the coastal area of northeastern Japan.read more
Citations
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Time and Space Distribution of Coseismic Slip of the 2011 Tohoku Earthquake as Inferred from Tsunami Waveform Data
TL;DR: A multiple time window inversion of 53 high-sampling tsunami waveforms on ocean bottom pressure, Global Positioning System, coastal wave, and tide gauges shows a temporal and spatial slip distribution during the 2011 Tohoku earthquake as mentioned in this paper.
Journal ArticleDOI
The 2011 Tohoku-Oki Earthquake: Displacement Reaching the Trench Axis
TL;DR: The difference between bathymetric data acquired before and after the earthquake revealed that the displacement extended out to the axis of the Japan Trench, suggesting that the fault rupture reached the trench axis.
Journal ArticleDOI
Episodic slow slip events in the Japan subduction zone before the 2011 Tohoku-Oki earthquake
Yoshihiro Ito,Ryota Hino,Motoyuki Kido,Hiromi Fujimoto,Yukihito Osada,Daisuke Inazu,Yusaku Ohta,Takeshi Iinuma,Mako Ohzono,Satoshi Miura,Masaaki Mishina,Kensuke Suzuki,Takeshi Tsuji,Juichiro Ashi +13 more
TL;DR: In this paper, the authors describe two transient slow slip events that occurred before the 2011 Tohoku-Oki earthquake, which induced increases in shear stress, which in turn triggered the interplate earthquakes.
Journal ArticleDOI
Coseismic slip distribution of the 2011 off the Pacific Coast of Tohoku Earthquake (M9.0) refined by means of seafloor geodetic data
Takeshi Iinuma,Ryota Hino,Motoyuki Kido,Daisuke Inazu,Yukihito Osada,Yoshihiro Ito,Mako Ohzono,Hiroaki Tsushima,Syuichi Suzuki,Hiromi Fujimoto,Satoshi Miura +10 more
TL;DR: In this paper, the authors estimate the coseismic slip distribution based on terrestrial GPS observations and all available seafloor geodetic data that significantly improves the spatial resolution at the shallow portion of the plate interface, revealing that an extremely large (greater than 50 m) slip occurred in a small (about 40 km in width and 120 km in length) area near the Japan Trench and generated the huge tsunami.
Journal ArticleDOI
Preceding, coseismic, and postseismic slips of the 2011 Tohoku earthquake, Japan
Shinzaburo Ozawa,Takuya Nishimura,Hiroshi Munekane,Hisashi Suito,Tomokazu Kobayashi,Mikio Tobita,Tetsuro Imakiire +6 more
TL;DR: In this article, the authors estimated the spatial and temporal evolution of preceding aseismic slip from January 2003 to January 2011, the coseismic and afterslip areas of the Tohoku earthquake, and the postslip after the earthquake based on global positioning system (GPS) data.
References
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TL;DR: Finite-source imaging reveals that the rupture consisted of a small initial phase, deep rupture for up to 40 seconds, extensive shallow rupture at 60 to 70 seconds, and continuing deep rupture lasting more than 100 seconds, which may have enabled large shallow slip near the trench.
Journal ArticleDOI
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