Japan Geoscience Union Meeting 2015

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Oral

Symbol H (Human Geosciences) » H-QR Quaternary research

[H-QR23] Diachronic dynamics of human-environment interactions

Sun. May 24, 2015 11:00 AM - 12:45 PM 101A (1F)

Convener:*Takahiro Miyauchi(Department of Earth Sciences, Graduate School of Science, Chiba University), Takashi AZUMA(National Institute of Advanced Industrial Science and Technology), Yoshinori MIYACHI(National Institute of Advanced Industrial Science and Technology), Chair:Yoshinori MIYACHI(National Institute of Advanced Industrial Science and Technology), Takashi AZUMA(National Institute of Advanced Industrial Science and Technology)

11:15 AM - 11:30 AM

[HQR23-05] Liquefaction-fluidization mechanism in man-made strata along Tone River at the 2011 off the Pacific coast of Tohoku Eq.

*Osamu KAZAOKA1, Taku KOMATUBARA2, Kiyohide MIZUNO2, Kunio FURUNO1, Takeshi YOSHIDA1, Yoshinori MIYACHI2, Masaaki MORISAKI1, Atsushi KAGAWA1, Takushi HOSOYA3 (1.Research Institute of Environmental Geology, Chiba, 2.AIST, Geological Survey of Japan. Institute of Geology and Geoinformation, 3.Chuo Kaihatsu Corporation)

Keywords:Liquefaction-fluidization, man-made strata, Tone River, The 2011 off the Pacific coast of Tohoku Earthquake, trench survey

Many sand volcano distributed on reclaimed land by hydraulic fill around Yodaura Marsh along Tone river on the 2011 off the Pacific coast of Tohoku Earthquake. One of the sand volcano was excavated after falling off groundwater level by well point method. The large relief peels were took from the large trench section. Detailed stratigraphy of man-made strata was cleared and mechanism of liquefaction-fluidization was evidented.