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

Proceedings of the International Association of Hydrological Sciences. 2015;372:221-226 DOI 10.5194/piahs-372-221-2015

 

Journal Homepage

Journal Title: Proceedings of the International Association of Hydrological Sciences

ISSN: 2199-8981 (Print); 2199-899X (Online)

Publisher: Copernicus Publications

Society/Institution: International Association of Hydrological Sciences

LCC Subject Category: Geography. Anthropology. Recreation: Environmental sciences | Science: Geology

Country of publisher: Germany

Language of fulltext: English

Full-text formats available: PDF, XML

 

AUTHORS

O. Kazaoka (Research Institute of Environmental Geology, Chiba (RIEGC), Japan)
S. Kameyama (Environmental Protection division of Chiba Prefectural Government, Japan)
K. Shigeno (Meiji Consultante Co., Ltd, Japan)
Y. Suzuki (Meiji Consultante Co., Ltd, Japan)
M. Morisaki (Research Institute of Environmental Geology, Chiba (RIEGC), Japan)
A. Kagawa (Research Institute of Environmental Geology, Chiba (RIEGC), Japan)
T. Yoshida (Research Institute of Environmental Geology, Chiba (RIEGC), Japan)
M. Kimura (Research Institute of Environmental Geology, Chiba (RIEGC), Japan)
Y. Sakai (Research Institute of Environmental Geology, Chiba (RIEGC), Japan)
T. Ogura (Research Institute of Environmental Geology, Chiba (RIEGC), Japan)
T. Kusuda (Former member of Research Institute of Environmental Geology, Chiba)
K. Furuno (Former member of Research Institute of Environmental Geology, Chiba)

EDITORIAL INFORMATION

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Time From Submission to Publication: 12 weeks

 

Abstract | Full Text

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.