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Page 1: Vol. pp. 2. ,**3 ,,3 ,.* ˘ˇ · Vol. pp. *e-mail: nikosh@eri.u-tokyo.ac.jp Association for Earthquake Disaster Prevention Graduate School of Science, Osaka City University Earthquake

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229

Bull. Earthq. Res. Inst.

Univ. Tokyo

Vol. pp.

* e-mail : [email protected]

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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Page 2: Vol. pp. 2. ,**3 ,,3 ,.* ˘ˇ · Vol. pp. *e-mail: nikosh@eri.u-tokyo.ac.jp Association for Earthquake Disaster Prevention Graduate School of Science, Osaka City University Earthquake

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Page 3: Vol. pp. 2. ,**3 ,,3 ,.* ˘ˇ · Vol. pp. *e-mail: nikosh@eri.u-tokyo.ac.jp Association for Earthquake Disaster Prevention Graduate School of Science, Osaka City University Earthquake

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Fig. . Cross section of the Geo-slicer core in the survey of (from Shimazaki ).et al.,+ +332 +332

Page 4: Vol. pp. 2. ,**3 ,,3 ,.* ˘ˇ · Vol. pp. *e-mail: nikosh@eri.u-tokyo.ac.jp Association for Earthquake Disaster Prevention Graduate School of Science, Osaka City University Earthquake

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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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Page 5: Vol. pp. 2. ,**3 ,,3 ,.* ˘ˇ · Vol. pp. *e-mail: nikosh@eri.u-tokyo.ac.jp Association for Earthquake Disaster Prevention Graduate School of Science, Osaka City University Earthquake

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Fig. . Photograph of Geo-slicer samples..

Page 6: Vol. pp. 2. ,**3 ,,3 ,.* ˘ˇ · Vol. pp. *e-mail: nikosh@eri.u-tokyo.ac.jp Association for Earthquake Disaster Prevention Graduate School of Science, Osaka City University Earthquake

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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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Page 7: Vol. pp. 2. ,**3 ,,3 ,.* ˘ˇ · Vol. pp. *e-mail: nikosh@eri.u-tokyo.ac.jp Association for Earthquake Disaster Prevention Graduate School of Science, Osaka City University Earthquake

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Fig. . Cross section due to the single-channel seismic profiling survey.

Fig. . Lines of multi-channel seismic profiling survey

(A-B and C-D) and location of graben structure. E -E

and N -N indicate the location of faults (from

Sugiyama and Endo, ).

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Page 8: Vol. pp. 2. ,**3 ,,3 ,.* ˘ˇ · Vol. pp. *e-mail: nikosh@eri.u-tokyo.ac.jp Association for Earthquake Disaster Prevention Graduate School of Science, Osaka City University Earthquake

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Page 9: Vol. pp. 2. ,**3 ,,3 ,.* ˘ˇ · Vol. pp. *e-mail: nikosh@eri.u-tokyo.ac.jp Association for Earthquake Disaster Prevention Graduate School of Science, Osaka City University Earthquake

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Fig. . Photograph and sketch of boring core samples at the Edogawa primary school.3

Page 10: Vol. pp. 2. ,**3 ,,3 ,.* ˘ˇ · Vol. pp. *e-mail: nikosh@eri.u-tokyo.ac.jp Association for Earthquake Disaster Prevention Graduate School of Science, Osaka City University Earthquake

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Table . Characterics of boring core samples at the Edogawa primary school.+

Page 11: Vol. pp. 2. ,**3 ,,3 ,.* ˘ˇ · Vol. pp. *e-mail: nikosh@eri.u-tokyo.ac.jp Association for Earthquake Disaster Prevention Graduate School of Science, Osaka City University Earthquake

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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.

+*

Page 12: Vol. pp. 2. ,**3 ,,3 ,.* ˘ˇ · Vol. pp. *e-mail: nikosh@eri.u-tokyo.ac.jp Association for Earthquake Disaster Prevention Graduate School of Science, Osaka City University Earthquake

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