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Bull. Earthq. Res. Inst.
Univ. Tokyo
Vol. pp.
* e-mail : nikosh@eri.u-tokyo.ac.jp
Association for Earthquake Disaster Prevention
Graduate School of Science, Osaka City University
Earthquake Research Institute, University of Tokyo
Faculty of Environmental Studies, Hiroshima Institute of Technology
Geo-slicer sampling of riverbed strata, boring sampling of riverside strata, single-channel
seismic reflection survey, and electric survey were carried out to understand the causes of ground
fissures and ruptures with a vertical dislocation of cm found by Shimazaki and others beneath
the Old-Edo River in Tokyo in . We concluded that fissures and ruptures were caused by
gravity slumping due to liquefaction taking place near a paleo-valley, which was found by the
reflection survey to run across the Old-Edo River. In the survey, at least two liquefaction and
slumping events, probably corresponding to two large earthquakes, were identified from a Geo-
slicer sample down to about m in depth. Their ages were reported as after yBP and
yBP, respectively. Dating results for new samples obtained in this study are consistent with
previous estimates.
: Geo-Slicer, Liquefaction, slumping traces, the Old-Edo River
;
*
Kunihiko Shimazaki *, Tsuyoshi Haraguchi , Takeo Ishibe and Takashi Nakata
Abstract
Key words
Resurvey of Possible Seismic Fissures in the Old-Edo
River in Tokyo
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Fig. . Plan of survey points and datum. The blue and green dashed line indicate strike of fissure or fault by
the Geo-slicer survey in , and fault strike from Sugiyama and Endo ( ), respectively.
Fig. . Locations of Geo-slicer survey at riverbed of the Old-Edo River and boring survey at the Edogawa primary school.
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Fig. . Photograph of Geo-slicer samples..
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Fig. . Estimated cross section at the riverbed of the Old-Edo River based on the Geo-slicer survey.
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Fig. . Photograph and sketch of boring core samples at the Edogawa primary school.3
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Table . Characterics of boring core samples at the Edogawa primary school.+
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Fig. . Comparison between boring core at the Edogawa primary school and the Geo-slicer sample at the
riverbed of the Old-Edo River.
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.2
.0
,/3
//
+
/*
+*2
0-
+0
+*0
�