Abstract
I report turbidite layers collected from a deep-sea terrace. The sample was recovered at 1555 m in water depth using a 4 m piston core system during the cruise YK14-21 by R/V Yokosuka. The sediments are composed of silty clay interbedded with five turbidite layers (T1–T5). Wood skins were observed at the base of the T4 and T5 indicating the 14C age being 41,720 ± 520 year BP and an age older than 43,500 being the Last Glacier Period. I analyzed the paleocurrent directions of these turbidite layers using magnetic methods. As a result, the turbidite layers were mostly transported repeatedly from east as NE Japan arc, and deposited on a slope in the deep-sea terrace. On the basis of the 14C ages, these turbidite layers might not be related to the recent large earthquakes. However, we need further to do a basic sedimentological study to identify the earthquake-and/or tsunami-generated turbidite layers in the Tohoku region.
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Acknowledgements
I thank chief scientist Makoto Yamano and captain Takafumi Aoki and crew members of R/V Yokosuka also supported the cruise and recovering the core sample. Professor Masafumi Murayama, Professor. Yuhji Yamamoto, Dr. Toshiya Kanamatsu and Mr. Takuya Matsuzaki supported the X–ray CT, grain size paleomagnetism and AMS analyse. Mr. Keita Yoshimoto and Ms. Mebae Kuranaga helped for core sampling and laboratory measurements. I thank Dr. Khang Dang and one anonymous reviewer for their constructive suggestions. This study was performed under the cooperative research program of the Centre for Advanced Marine Core Research (CMCR), Kochi University (14B049).
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Kawamura, K. (2021). A Sedimentological Study of Turbidite Layers on a Deep–Sea Terrace in the Japan Trench. In: Sassa, K., Mikoš, M., Sassa, S., Bobrowsky, P.T., Takara, K., Dang, K. (eds) Understanding and Reducing Landslide Disaster Risk. WLF 2020. ICL Contribution to Landslide Disaster Risk Reduction. Springer, Cham. https://doi.org/10.1007/978-3-030-60196-6_28
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