Japan Geoscience Union Meeting 2015

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Symbol H (Human Geosciences) » H-SC Social Earth Sciences & Civil/Urban System Sciences

[H-SC24] Human environment and disaster risk

Sun. May 24, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

Convener:*Tatsuto Aoki(School of Regional Development Studies, Kanazawa University), Yasuhiro Suzuki(Nagoya University), Mamoru Koarai(Survey Department, College of Land, Infrastructure, Transport and Tourism), Toshihiko Sugai(Department of Natural Environmental Studies, Institute of Environmental Studies, Graduate School of Frontier Science, The University of Tokyo), Hiroshi Une(Geospacial Information Authority of Japan), Yoichi Nakamura(Department of Earth Sciences, Utsunomiya University), Jun Matsumoto(Deaprtment of Geography, Tokyo Metropolitan University), Shintaro Goto(Department of Environmental Systems Faculty of GEO-Environmental Science Rissho University), Keitarou Hara(Faculty of Informatics, Tokyo University of Information Sciences)

6:15 PM - 7:30 PM

[HSC24-P02] Correlation between liquefaction areas in Kanto region and the time-series changes of distribution of gravel pits

*Masafumi AOYAMA1, Takushi KOYAMA2 (1.Japan Map Center, 2.Oita University)

Keywords:liquefaction, gravel pits, land history, aerial photo, liquefaction potential estimation, 2011 off the Pacific coast of Tohoku Earthquake

Geomorphological condition and land history of liquefied sites in Kamisu and Kashima cities caused by the 2011 off the Pacific coast of Tohoku Earthquake were evaluated by means of aerial photos and old edition maps. Liquefied sites in this region were identified based on the field survey and Google Earth images interpretation. In this area, a large number of the liquefied sites were identified in reclaimed area of former pond and gravel pits. These gravel pits were developed since the late of 1960s, and many places of these gravel pits were reclaimed. In Kanto region, a large number of liquefied sites were identified in gravel pits in the basin of Kuji, Naka, Kokai and Kinu River. In Japan, a large number of man-made soil deposits are distributed in densely inhabited district. Therefore, the information of time-series changes of distribution of gravel pits is important for evaluate of a liquefaction potential.