scholarly journals Spatial distribution of earthquakes off the east coast of the Kanto region along the Japan Trench deduced from ocean bottom seismographic observations and their relations with the aftershock sequence of the 2011 off the Pacific coast of Tohoku Earthquake

2011 ◽  
Vol 63 (7) ◽  
pp. 841-845 ◽  
Author(s):  
Tomoaki Yamada ◽  
Kazuo Nakahigashi ◽  
Asako Kuwano ◽  
Kimihiro Mochizuki ◽  
Shin’ichi Sakai ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Pacific Coast ◽  
East Coast ◽  
Tohoku Earthquake ◽  
Aftershock Sequence ◽  
Japan Trench ◽  
Ocean Bottom ◽  
The Pacific ◽  
Kanto Region

scholarly journals Spatial distribution and focal mechanisms of aftershocks of the 2011 off the Pacific coast of Tohoku Earthquake

2011 ◽  
Vol 63 (7) ◽  
pp. 669-673 ◽  
Author(s):  
Youichi Asano ◽  
Tatsuhiko Saito ◽  
Yoshihiro Ito ◽  
Katsuhiko Shiomi ◽  
Hitoshi Hirose ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Focal Mechanisms ◽  
The Pacific

scholarly journals Significant tsunami observed at ocean-bottom pressure gauges during the 2011 off the Pacific coast of Tohoku Earthquake

2011 ◽  
Vol 63 (7) ◽  
pp. 803-808 ◽  
Author(s):  
Takuto Maeda ◽  
Takashi Furumura ◽  
Shin’ichi Sakai ◽  
Masanao Shinohara
Keyword(s):  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Ocean Bottom ◽  
Bottom Pressure ◽  
Ocean Bottom Pressure ◽  
The Pacific

scholarly journals Liquefaction in the Kanto region during the 2011 off the pacific coast of Tohoku earthquake

2014 ◽  
Vol 54 (4) ◽  
pp. 859-873 ◽  
Author(s):  
Ikuo Towhata ◽  
Shogo Maruyama ◽  
Kin-ichi Kasuda ◽  
Junichi Koseki ◽  
Kazue Wakamatsu ◽  
...  
Keyword(s):  
Pacific Coast ◽  
Tohoku Earthquake ◽  
The Pacific ◽  
Kanto Region

scholarly journals Seismicity near the hypocenter of the 2011 off the Pacific coast of Tohoku earthquake deduced by using ocean bottom seismographic data

2012 ◽  
Vol 64 (12) ◽  
pp. 1125-1135 ◽  
Author(s):  
Kensuke Suzuki ◽  
Ryota Hino ◽  
Yoshihiro Ito ◽  
Yojiro Yamamoto ◽  
Syuichi Suzuki ◽  
...  
Keyword(s):  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Ocean Bottom ◽  
The Pacific

Seismic Responses of High-Rise Buildings Subjected to Extreme Ground Motions of Tohoku Earthquake in Japan

2011 ◽  
Vol 374-377 ◽  
pp. 2118-2125
Author(s):  
Yong Tao Bai ◽  
Akihiko Kawano ◽  
Shintaro Matsuo ◽  
Keita Odawara
Keyword(s):  
Pacific Coast ◽  
East Coast ◽  
Ground Motions ◽  
Vertical Direction ◽  
Tohoku Earthquake ◽  
Seismic Demand ◽  
Seismic Responses ◽  
Stability Behavior ◽  
High Rise ◽  
The Pacific

Seismic performances of high-rise buildings are urgent to be studied given the background of the 2011 off the Pacific coast of Tohoku earthquake and probable long-period ground motions happened in subduction zone near east-coast of Japan. One 20 story frame of CFT and steel high-rise buildings were modeling, and seismic responses of models were simulated in FEM program with fiber model subjected to extreme ground motions recorded in the 2011 off the Pacific coast of Tohoku earthquake and the relevant artificial ground motions. Analysis results indicate that, the frame models could not satisfy the seismic demand under extreme ground motions. The CFT model has superior ultimate stability behavior than steel model as result of confinement effect of confined concrete to steel tubular. The phenomenon of deformation concentration along with vertical direction becomes more intense when the inputting acceleration level arrives extremely higher.

scholarly journals Precise aftershock distribution of the 2011 off the Pacific coast of Tohoku Earthquake revealed by an ocean-bottom seismometer network

2012 ◽  
Vol 64 (12) ◽  
pp. 1137-1148 ◽  
Author(s):  
Masanao Shinohara ◽  
Yuya Machida ◽  
Tomoaki Yamada ◽  
Kazuo Nakahigashi ◽  
Takashi Shinbo ◽  
...  
Keyword(s):  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Ocean Bottom ◽  
Ocean Bottom Seismometer ◽  
Aftershock Distribution ◽  
The Pacific ◽  
Precise Aftershock Distribution

scholarly journals Impact of the 2011 off the Pacific coast of Tohoku earthquake on a deep-sea benthic ecosystem: evidence from living and dead benthic foraminifera on the landward slope of the Japan Trench

2018 ◽  
Author(s):  
Akira Tsujimoto ◽  
Ritsuo Nomura ◽  
Hidetaka Nomaki ◽  
Kazuno Arai ◽  
Mutsuo Inoue ◽  
...  
Keyword(s):  
Benthic Foraminifera ◽  
Deep Sea ◽  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Radioactive Material ◽  
Japan Trench ◽  
Sediment Surface ◽  
Foraminiferal Assemblage ◽  
The Pacific ◽  
The Impact

Abstract. We examined the impact of the earthquake and tsunami following the 2011 off the Pacific coast of Tohoku earthquake on the deep-sea benthic ecosystems based on radionuclide and benthic foraminiferal analysis of core sediments, collected from 3200 and 3600 m water depths 5 and 17 months after the earthquake. Radionuclide analysis of the excess 210Pb, 134Cs, and 137Cs indicated that some of the analyzed sediment core recorded deposits before the earthquake, event deposits just after the earthquake, and deposits after the Fukushima Daiichi Nuclear Power Plant accident, which caused the release of a large amount of radioactive material 4 days after the earthquake. Uvigerina senticosa, Chilostomella oolina, and Elphidium batialis were the dominant species in the study area prior to the earthquake. In core 4W-2012, the original or pre-earthquake assemblage layer was covered by 5-cm-thick event deposits following the earthquake that contained a high diversity allochthonous foraminiferal assemblage. Following the episodic deposition, foraminiferal density drastically decreased and many species disappeared, resulting in a decrease in species diversity. Above 10 cm depth in the sediment, living specimens of opportunistic and competitive species gradually increased toward the sediment surface and became dominant in the top 1 cm of the core. Thus, the episodic deposition resulting from the earthquake caused a drastic decrease in the original benthic foraminifera and colonization of opportunistic species with a low diversity within 17 months. Although there were differences in vertical change in the radionuclides and benthic foraminifera between sites, faunal change may have already occurred 5 months after the earthquake.

scholarly journals Aftershock observation of the 2011 off the Pacific coast of Tohoku Earthquake by using ocean bottom seismometer network

2011 ◽  
Vol 63 (7) ◽  
pp. 835-840 ◽  
Author(s):  
Masanao Shinohara ◽  
Tomoaki Yamada ◽  
Kazuo Nakahigashi ◽  
Shin’ichi Sakai ◽  
Kimihiro Mochizuki ◽  
...  
Keyword(s):  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Ocean Bottom ◽  
Ocean Bottom Seismometer ◽  
The Pacific ◽  
Aftershock Observation

Development of Damage Functions on Road Infrastructures Subjected to Extreme Ground Excitations by Analyzing Damage in the 2011 off the Pacific Coast of Tohoku Earthquake

2014 ◽  
Vol 9 (2) ◽  
pp. 121-127 ◽  
Author(s):  
Gaku Shoji ◽  
◽  
Tomoharu Nakamura ◽  
Keyword(s):  
Spatial Distribution ◽  
Pacific Coast ◽  
Failure Modes ◽  
Tohoku Earthquake ◽  
Seismic Intensity ◽  
Road Surface ◽  
Damage Functions ◽  
The Pacific ◽  
Damage Data ◽  
The Relationship

Road infrastructure damage due to extreme ground excitations during theMarch 2011 Tohoku earthquake was assessed and 161 items of damage road structure data were classified into three types of failure modes: road surface and embankment damage items, road surface crack items and road subsidence items. We then compared a damage ratio, which is defined by the number of damage points divided by total road length, to the estimated spatial distribution of JMA instrumental seismic intensity. The maximum damage ratio for the 161 damage data items is 0.0290 points/km compared to a JMA instrumental seismic intensity of 5.8. Last, we developed damage functions for road infrastructures subjected to extreme ground excitations, which describe the relationship between the damage ratios and seismic intensity.

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