Liquefaction Analyses of Reclaimed Ground and Levee Considering the Damage by the 2011 Great Tohoku Earthquake and Lessons

2016 ◽  
Vol 11 (5) ◽  
pp. 830-844
Author(s):  
Fusao Oka ◽  
◽  
Sayuri Kimoto ◽  
Hirokazu Yui ◽  
Hiroshi Matsuoka ◽  
...  
Keyword(s):  
Pacific Coast ◽  
Prediction Method ◽  
Tohoku Earthquake ◽  
Great Earthquake ◽  
Housing Area ◽  
The Pacific ◽  
Industrial Complexes ◽  
Liquefaction Analysis

We have reviewed liquefaction-induced damage to reclaimed ground, levees and industrial complexes, caused by the 2011 off the Pacific Coast of Tohoku Earthquake. Then, we reconsidered the method of the prediction of liquefaction and estimated liquefaction at Urayasu housing area using a new liquefaction prediction method based on dynamic numerical liquefaction analysis of the ground. We also clarified the feature of the damage of levee due to the 2011 Great Tohoku Earthquake based on the dynamic liquefaction analysis and listed the lessons taught by the analyses and the damages due to the 2011 Tohoku Great Earthquake are shown.

scholarly journals Subsidence by liquefaction-fluidization in man-made strata around Tokyo bay, Japan: from geological survey on damaged part at the 2011 off the Pacific Coast of Tohoku Earthquake

2015 ◽  
Vol 372 ◽  
pp. 221-226
Author(s):  
O. Kazaoka ◽  
S. Kameyama ◽  
K. Shigeno ◽  
Y. Suzuki ◽  
M. Morisaki ◽  
...  
Keyword(s):  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Geological Survey ◽  
Japan Meteorological Agency ◽  
Tokyo Bay ◽  
Great Earthquake ◽  
Reclaimed Land ◽  
Chiba Prefecture ◽  
Detailed Classification ◽  
The Pacific

Abstract. Geological disaster by liquefaction-fluidization happened on southern part of the Quaternary Paleo-Kanto submarine basin at the 2011 Earthquake off the Pacific Coast of Tohoku. Liquefaction-fluidization phenomena occurred mainly in man-made strata over shaking 5+ intensity of Japan Meteorological Agency scale. Many subsided spots, 10–50 m width, 20–100 m length and less than 1 m depth, by liquefaction-fluidization distributed on reclaimed land around northern Tokyo bay. Large amount of sand and groundwater spouted out in the terrible subsided parts. But there are little subsidence and no jetted sand outside the terrible subsided part. Liquefaction-fluidization damaged part at the 1987 earthquake east off Chiba prefecture re-liquefied and fluidized in these parts at the 2011 great earthquake. The damaged area were more wide on the 2011 earthquake than the 1987 quake. Detailed classification maps of subsidence by liquefaction-fluidization on the 2011 grate earthquake were made by fieldwork in Chiba city around Tokyo bay. A mechanism of subsidence by liquefaction-fluidization in man-made strata was solved by geological survey with continuous large box cores on the ACE Liner and large relief peals of the cores at a typical subsided part.

Comprehensive Seismic Evaluation of HTTR Against the 2011 Off the Pacific Coast of Tohoku Earthquake

2018 ◽  
Vol 4 (2) ◽  
Author(s):  
Masato Ono ◽  
Kazuhiko Iigaki ◽  
Hiroaki Sawahata ◽  
Yosuke Shimazaki ◽  
Atsushi Shimizu ◽  
...  
Keyword(s):  
Seismic Response ◽  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Reactor Power ◽  
Great Earthquake ◽  
Response Analysis ◽  
Seismic Response Analysis ◽  
Control Rod ◽  
The Pacific ◽  
Equipment And Instruments

On Mar. 11, 2011, the 2011 off the Pacific coast of Tohoku Earthquake of magnitude 9.0 occurred. When the great earthquake occurred, the high temperature engineering test reactor (HTTR) had been stopped under the periodic inspection and maintenance of equipment and instruments. A comprehensive integrity evaluation was carried out for the HTTR facility because the maximum seismic acceleration observed at the HTTR exceeded the maximum value of design basis earthquake. The concept of comprehensive integrity evaluation is divided into two parts. One is the “visual inspection of equipment and instruments.” The other is the “seismic response analysis” for the building structure, equipment and instruments using the observed earthquake. All equipment and instruments related to operation were inspected in the basic inspection. The integrity of the facilities was confirmed by comparing the inspection results or the numerical results with their evaluation criteria. As the results of inspection of equipment and instruments associated with the seismic response analysis, it was judged that there was no problem for operation of the reactor, because there was no damage and performance deterioration. The integrity of HTTR was also supported by the several operations without reactor power in cold conditions of HTTR in 2011, 2013, and 2015. Additionally, the integrity of control rod guide blocks was also confirmed visually when three control rod guide blocks and six replaceable reflector blocks were taken out from reactor core in order to change neutron startup sources in 2015.

scholarly journals Seawater-leaching Testing for Arsenic and Heavy Metals in Tsunami Deposits Produced by the 2011 off the Pacific Coast of Tohoku Earthquake, Northeastern Japan

2014 ◽  
Vol 123 (6) ◽  
pp. 835-853 ◽  
Author(s):  
Takahiro WATANABE ◽  
Noriyoshi TSUCHIYA ◽  
Shin-ichi YAMASAKI ◽  
Ryoichi YAMADA ◽  
Nobuo HIRANO ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Tsunami Deposits ◽  
Northeastern Japan ◽  
The Pacific

scholarly journals Seismic and aseismic fault slip before and during the 2011 off the Pacific coast of Tohoku Earthquake

2011 ◽  
Vol 63 (7) ◽  
pp. 637-642 ◽  
Author(s):  
Shin’ichi Miyazaki ◽  
Jeffery J. McGuire ◽  
Paul Segall
Keyword(s):  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Fault Slip ◽  
The Pacific
Sign in / Sign up

Export Citation Format

Share Document