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Takashi KIYOTA, Hiroyuki KYOKAWA
2011 Volume 63 Issue 6 Pages
709-715
Published: 2011
Released on J-STAGE: December 27, 2011
JOURNAL
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The Tohoku earthquake hit the east Japan on March 11
th, 2011. Many coastal areas along Pacific Ocean were destroyed by tsunami, while a large number of geo-disasters was caused by the earthquake over a large extent of area in the eastern Japan. In Miyagi prefecture, there are many artificial earth fills for housing estate that suffered from serious earthquake-induced damage. During the construction of these areas, cut-and-fill work was carried out, and most of the significant earthquake-induced damage could be found in a fill part. This report summarizes damage aspects of landfills that have so far been found by the author’s field investigations. [This abstract is not included in the PDF]
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Toshihiko KATAGIRI, Kazuo KONAGAI
2011 Volume 63 Issue 6 Pages
717-722
Published: 2011
Released on J-STAGE: December 27, 2011
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Observations at Toyocho and Shinkiba sites have started in 1976 in commission from Tokyo Metro Subway. They are the closest to the Tokyo Bay Area, which has sufferd serious liquefactions in the March 11th 2011 quake, “The 2011 Off the Pacific coast of Tohoku Earthquake”. And underground motions within a hard diluvial stratum were obtained at Shinkiba. We report it about an observation summary of Toyocho and Shinkiba and an earthquake record here. [This abstract is not included in the PDF]
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Mary Roxanne I. AGLIPAY, Sharma KESHAB, Hiroyuki KYOKAWA, Kazuo KONAGA ...
2011 Volume 63 Issue 6 Pages
723-727
Published: 2011
Released on J-STAGE: December 27, 2011
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Toru ASAKURA, Shota SUYAMA, Chikako ETO, Kenichi SHIBUYA, Kazuo KONAGA ...
2011 Volume 63 Issue 6 Pages
729-734
Published: 2011
Released on J-STAGE: December 27, 2011
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The 2011 East-Japan Earthquake has caused sand-liquefaction over the long stretch of Tokyo Bay area. Both Konagai laboratory and Aero Asahi Corporation jointly surveyed Urayasu city, one of the heavily liquefied areas, to measure soil subsidence caused by liquefaction. An airborne LIDAR imagery was obtained on April 20
th and compared with that before the earthquake. To remove the effect of deep-seated tectonic deformations, end-bearing pile supported buildings were taken as a reference. [This abstract is not included in the PDF]
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Kimiro MEGURO, Miho OHARA, Muneyoshi NUMADA, Shinya KONDO
2011 Volume 63 Issue 6 Pages
735-737
Published: 2011
Released on J-STAGE: December 27, 2011
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— Part 2 of Activity Reports of 3.11net Tokyo (Researcher’s Network for Supporting Recovery Activity from the Great East-Japan Earthquake Disaster)
Miho OHARA, Shinya KONDO, Muneyoshi NUMADA, Kimiro MEGURO
2011 Volume 63 Issue 6 Pages
739-747
Published: 2011
Released on J-STAGE: December 27, 2011
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After disaster occurs, various organizations usually conduct investigations in the affected area for understanding disaster situation. In order to avoid excessive burden to the affected area, cooperation and information sharing among different organizations are essential. Collaboration of various anademic fields is much more necessary in case of extremely wide-area disaster because existing academic frameworks may not give solutions to new social problems. In this papers, activities of 79 academic societies after the 2011 off the Pacific coast of Tohoku Earthquake were compared from the viewpoints of system, collaboration, publication of remmomendation and dispatch of specialists to the affected area. [This abstract is not included in the PDF]
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— Part 3 of Activity Reports of 3.11net Tokyo (Researcher’s Network for Supporting Recovery Activity from the Great East-Japan Earthquake Disaster)
Miho OHARA, Shinya KONDO, Taiki KOU, Muneyoshi NUMADA, Kimiro MEGURO
2011 Volume 63 Issue 6 Pages
749-754
Published: 2011
Released on J-STAGE: December 27, 2011
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In order to contribute to quick reconstruction after the 2011 off the Pacific coast of Tohoku Earthquake, it is important to develop new solutions for emerging social issues before they cause huge problems. After the earthquake, volunteer researchers launched “3.11 net Tokyo” as a network of researchers for supporting reconstruction of the earthquake in Tohoku. The member held several workshops for discussing social issues to be solved after the earthquake. In this paper, the process of extracting social issues based on KJ method and overview of all the issues was reported. The archive for social issues and their solutions was also proposed. [This abstract is not included in the PDF]
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Muneyoshi NUMADA, Shinya KONDO, Masashi INOUE, Kimiro MEGURO
2011 Volume 63 Issue 6 Pages
755-763
Published: 2011
Released on J-STAGE: December 27, 2011
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In this study, the unified description of the Regional Disaster Prevention Plan among the both of the support and the receive sides of local government can introduce to achieve the smoother and more effective response for regional cooperation during wide-area disaster. Referring to the cases of the Mid Niigata Prefectural Earthquake in 2004 and the Kobe earthquake in 1995, this research organized the elements of the framework for regional cooperation among the local governments in disaster area and in the non-disaster area, and analyzed the difference of the description of the Regional Disaster Plan. [This abstract is not included in the PDF]
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Ken’ichi KAWAGUCHI, Yoshiya TANIGUCHI, Yuki OZAWA, Yosuke NAKASO ...
2011 Volume 63 Issue 6 Pages
765-772
Published: 2011
Released on J-STAGE: December 27, 2011
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By the 2011 off the Pacific Coast of Tohoku Earthquake occurred on March 11, 2011 and its aftershocks, suspended ceilings had failed in several large public spaces. This paper reports distribution of the buildings. This paper also reports investigation results of five buildings whose ceilings had failed. It was found that failure of ceilings had mostly occurred in the area of five or more seismic intensity, and damage had reached widely. [This abstract is not included in the PDF]
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Yasushi OBA, Yosuke NAKASO, Ken’ichi KAWAGUCHI
2011 Volume 63 Issue 6 Pages
773-777
Published: 2011
Released on J-STAGE: December 27, 2011
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This is an investigation report on the failure of ceilings at entrance hall with well space of an airport building during the 2011 off the Pacific coast of Tohoku earthquake. Luckily, nobody was injured by the accident, however the height of the ceilings was so high and it is worth to estimate impact of the failure and possible danger to human body for better understanding of the risk of such failure. The impact estimation was carried out by reference to the news video taken during the accident and by comparing to the experimental results of dummy head test. [This abstract is not included in the PDF]
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Ken’ichi KAWAGUCHI, Yosuke NAKASO, Yoshiro OGI, Kazutaka UEMURA, ...
2011 Volume 63 Issue 6 Pages
779-783
Published: 2011
Released on J-STAGE: December 27, 2011
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This paper reports damage to non-structural components in the National Museum of Emerging Science and Innovation (Miraikan), Tokyo, Japan during the 2011 off the Pacific Coast of Tohoku Earthquake and its aftershocks. Also, the paper reports recovery of the damaged ceiling using membrane materials. [This abstract is not included in the PDF]
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Yoshiro OGI, Ken’ichi KAWAGUCHI, Rina KIYOMOTO, Yosuke NAKASO, M ...
2011 Volume 63 Issue 6 Pages
785-790
Published: 2011
Released on J-STAGE: December 27, 2011
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This paper reports observation results of ceiling behavior in the National Museum of Emerging Science and Innovation (Miraikan), Tokyo, Japan during aftershocks of the 2011 off the Pacific Coast of Tohoku Earthquake. Analyses of acceleration data recorded during two aftershocks showed that the natural frequency of the horizontal motion was close to that of the building structure but slightly lower than it. Furthermore, it was found that, during the aftershocks, in-plane rotational motion occurred as well as translational motion, which magnified the amplitude of motions at the points in distance from the centroid of the ceiling. [This abstract is not included in the PDF]
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Takashi KIYOTA, Yasuyo HOSONO, Suguru YAMADA
2011 Volume 63 Issue 6 Pages
791-796
Published: 2011
Released on J-STAGE: December 27, 2011
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Three large-scale earthquakes, with magnitudes 7.1, 6.2 and 6.0, hit the Canterbury region on the South Island of New Zealand in September 2010, February 2011 and June 2011, respectively. Especially, the second large earthquake, 2011 Christchurch earthquake, caused most serious damage to lifelines and residential houses in the Christchurch city due to liquefaction and re-liquefaction. This report summarizes results of the liquefaction-induced damage survey immediately after these events. [This abstract is not included in the PDF]
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Yukika MIYASHITA, Junichi KOSEKI
2011 Volume 63 Issue 6 Pages
797-800
Published: 2011
Released on J-STAGE: December 27, 2011
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It was clarified that the strength and deformation properties of geo-materials depended on strain rate, and the characteristics or degree of the dependency varied in response to the viscous property of the materials. To investigate the effect of strain rate on strength and deformation properties of cement-treated sand, a series of triaxial compression tests was conducted while strain rate was changed stepwise by a factor of up to 1000 in each test.
Characteristics of the dependency on strain rate changed with the progress of loading, due to the large deformation along the shear band. [This abstract is not included in the PDF]
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Yukika MIYASHITA, Junichi KOSEKI
2011 Volume 63 Issue 6 Pages
801-804
Published: 2011
Released on J-STAGE: December 27, 2011
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It was clarified that the strength and deformation properties of geo-materials depended on strain rate, and the characteristics or degree of the dependency varied in response to the viscous property of the materials. To investigate the effect of strain rate on strength and deformation properties of cement-treated clay with high strength, a series of triaxial compression tests was conducted while strain rate was changed stepwise by a factor of up to 1000 in each test.
The stress-strain relationship at a certain level shifted to that of higher/ lower level after indicating high stiffness and subsequent yielding, when the strain rate suddenly increased/ decreased. [This abstract is not included in the PDF]
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Hiromasa NAKAGAMI, Noriyuki TAKAHASHI, Ho CHOI, Yoshiaki NAKANO
2011 Volume 63 Issue 6 Pages
805-809
Published: 2011
Released on J-STAGE: December 27, 2011
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The objective of this study is to develop a seismic capacity evaluation method of R/C buildings with irregular plan configuration under translational responses. An irregular shape building is divided into two building blocks connected with floor slabs, and each block is modeled to a single degree of freedom system connected with a shear spring representing a slab. Time history response analyses and an estimating method based on the static force equilibrium are employed to evaluate the seismic capacity of the building with different mass and strength of each block as well as in-plane stiffness and hysteresis characteristics of connecting slab. [This abstract is not included in the PDF]
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Miho OHARA, Kimiro MEGURO, Atsushi TANAKA
2011 Volume 63 Issue 6 Pages
811-816
Published: 2011
Released on J-STAGE: December 27, 2011
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After the off the Pacific coast of Tohoku Earthquake occurred on March 11, 2011, numerous aftershocks continued and a lot of Earthquake Early Warnings (EEW) were announced although some of them failed to estimate intensity properly due to technical limitation. In this paper, two questionnaire surveys were conducted to understand people’s awareness of EEW before and after the earthquake on March 11, 2011. As a result, it was verified people’s knowledge and their abilities to recognize EEW after hearing or seeing the warning increased. When they knew the technical limitation before the earthquakes, their capacities to accept the failure of EEW was higher. [This abstract is not included in the PDF]
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Hidetoshi YOSHINARI, Miho OHARA, Kimiro MEGURO
2011 Volume 63 Issue 6 Pages
817-822
Published: 2011
Released on J-STAGE: December 27, 2011
JOURNAL
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The Japan Meteorological Agency (JMA) was started the public service of earthquake early warning (EEW) since October 1st, 2007. The number of earthquakes that EEW was announced since October, 2007 is too limited to evaluate the effectiveness of EEW properly. Therefore, in this research, using the data of the past earthquakes’ occurred from 1923 to 2007, expected lead times before S-waves were analyzed based on the assumption that EEW system had been operated before those earthquakes. In addition, the effect of increasing seismometers in the future was also simulated. Based on the results obtained in both current and future cases, regional characteristics of expected lead times of EEW and their damage mitigation effect in each region were revealed, and future strategies for making the best use of EEW were discussed. [This abstract is not included in the PDF]
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