scholarly journals SOIL SUBSIDENCE MAP FOR THE WEST PART OF TOKYO BAY AREA LIQUEFIED IN THE MARCH 11th, OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE

2017 ◽  
Vol 73 (4) ◽  
pp. I_243-I_250
Author(s):  
Kazuhiro KAJIHARA ◽  
Kazuo KONAGAI ◽  
Takashi KIYOTA
Keyword(s):  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Tokyo Bay ◽  
The West ◽  
Bay Area ◽  
Soil Subsidence ◽  
The Pacific ◽  
West Part

scholarly journals Maps of soil subsidence for Tokyo bay shore areas liquefied in the March 11th, 2011 off the Pacific Coast of Tohoku Earthquake

2013 ◽  
Vol 53 ◽  
pp. 240-253 ◽  
Author(s):  
Kazuo Konagai ◽  
Takashi Kiyota ◽  
Shota Suyama ◽  
Toru Asakura ◽  
Kenichi Shibuya ◽  
...  
Keyword(s):  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Tokyo Bay ◽  
Soil Subsidence ◽  
The Pacific

scholarly journals EVALUATION OF BEDROCK MOTIONS IN TOKYO BAY AREA AND SITE AMPLIFICATION CHARACTERISTICS OF LONG PERIOD GROUND MOTIONS DURING THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE

2013 ◽  
Vol 19 (43) ◽  
pp. 849-854
Author(s):  
Masayuki NAGANO ◽  
Takenori HIDA ◽  
Takehiko TANUMA ◽  
Kazuhiro WATANABE ◽  
Nozomu IKAWA ◽  
...  
Keyword(s):  
Pacific Coast ◽  
Ground Motions ◽  
Tohoku Earthquake ◽  
Site Amplification ◽  
Tokyo Bay ◽  
Long Period ◽  
Bay Area ◽  
The Pacific

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.

scholarly journals Generating Factor of Strong Ground Motions for a period of 2 to 3 seconds Observed in the Western Part of Tokyo Bay, during the 2011 off the Pacific Coast of Tohoku Earthquake

2016 ◽  
Vol 16 (4) ◽  
pp. 4_35-4_51
Author(s):  
Seiji TSUNO ◽  
Hiroaki YAMANAKA ◽  
Saburoh MIDORIKAWA ◽  
Kosuke CHIMOTO ◽  
Hiroyuki MIYAKOSHI ◽  
...  
Keyword(s):  
Pacific Coast ◽  
Ground Motions ◽  
Tohoku Earthquake ◽  
Tokyo Bay ◽  
Strong Ground Motions ◽  
The Pacific ◽  
Strong Ground

Performance of Piled Raft Foundation with Grid-Form Ground Improvement During the 2011 off the Pacific Coast of Tohoku Earthquake

2012 ◽  
Vol 7 (6) ◽  
pp. 726-732 ◽  
Author(s):  
Akihiko Uchida ◽  
◽  
Kiyoshi Yamashita ◽  
Nobuyuki Odajima ◽  
Keyword(s):  
Pacific Coast ◽  
Simulation Analysis ◽  
Ground Improvement ◽  
Tohoku Earthquake ◽  
Field Investigation ◽  
Soil Liquefaction ◽  
Tokyo Bay ◽  
Reclaimed Land ◽  
Piled Raft Foundation ◽  
The Pacific

Grid-form ground improvement by the deep cement mixing method is one of the countermeasures against soil liquefaction. Improvements by this method were confirmed during the southern Hyogo Prefecture Earthquake in 1995. The number of building foundations adopting this method has increased in the last years. During the 2011 off the Pacific coast of Tohoku Earthquake, which occurred on March 11, severe liquefaction damage was observed in reclaimed land in the Tokyo Bay area. Since then, liquefaction countermeasures have been recognized to be important to reclaimed land. A building foundation improved by grid-form ground improvement method is introduced in this paper. Field investigation results of ground around the building after the 2011 earthquake are presented. The effect of liquefaction prevention on gridform ground improvement is discussed based on dynamic nonlinear analysis of soil layers with actual acceleration records. Comparing field investigation results to simulation analysis, we concluded that gridform ground improvement prevented liquefaction of original soil surrounded by grid-form walls during the 2011 earthquake.

scholarly journals Taxonomic composition and distribution of cephalochordates (Cephalochordata: Amphioxiformes) from Mexico

2017 ◽  
Vol 44 (3) ◽  
pp. 497-503
Author(s):  
Luis Fernando Del Moral-Flores ◽  
Miguel Ángel Guadarrama-Martínez ◽  
César Flores-Coto
Keyword(s):  
Gulf Of Mexico ◽  
Pacific Coast ◽  
Yucatan Peninsula ◽  
Taxonomic Composition ◽  
The West ◽  
Taxonomic Key ◽  
The Pacific ◽  
Mexican Caribbean ◽  
West Part ◽  
Northeastern Coast

Based on the number of specimens examined, review of reference collections and literature, we determined the presence of four cephalochordates (two genera and one family) in the seas of Mexico; moreover, the registry of the locations is denoted also a taxonomic key for their identification comes attached. The presence of three of the four species for the Gulf of Mexico and the Mexican Caribbean is registered, of which Branchiostoma caribaeum has the largest distributional area, from Veracruz coasts to the Yucatan Peninsula; B. longirostrum has been registered only on the west part of the Gulf of Mexico and Asymmetron lucayanum in front of the northeastern coast of Yucatan. Branchiostoma californiense is the only one registered on the Pacific coast of Mexico but it counts with a wider distribution.

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