气候变化领域集成服务门户(CCPortal): Recent and historical tsunami deposits from Lake Tokotan, eastern Hokkaido, Japan, inferred from nondestructive, grain size, and radioactive cesium analyses

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DOI	10.1007/s11069-020-04007-7
	Recent and historical tsunami deposits from Lake Tokotan, eastern Hokkaido, Japan, inferred from nondestructive, grain size, and radioactive cesium analyses
	Shinozaki T.; Sawai Y.; Ito K.; Hara J.; Matsumoto D.; Tanigawa K.; Pilarczyk J.E.
发表日期	2020
ISSN	0921030X
起始页码	713
结束页码	730
卷号	103 期号:1
英文摘要	Geological evidence of recent tsunamis from sediment samples collected from Lake Tokotan, a coastal lagoon in eastern Hokkaido, northern Japan, was detected using computed tomography (CT) and soft X-ray images, grain size, and radionuclide profiles. Initial field observations revealed that sediments had no discernable sedimentary structures at the top of the core. However, results of CT imaging, soft X-ray, and grain size analyses show evidence for three invisible sand layers that are intercalated with mud layers. These sand layers exhibit trends of landward fining and thinning. Furthermore, the distribution of sand layers was limited to the center and seaward parts of the lake. Vertical profiles of cesium and lead concentrations in combination with recent eyewitness accounts indicated that these sand layers are correlated with the 1973 Nemuro-oki, 1960 Chilean, and 1952 Tokachi-oki tsunami events. The deeper part of the sediment cores includes three volcanic ash layers and three prehistoric coarse sand layers. The prehistoric layers are correlated with unusually large tsunamis that were geologically identified in previous studies from eastern Hokkaido. These findings suggest that nondestructive techniques, in combination with radionuclide analysis, allow for detection of frequent but faint tsunami deposits. This technique allows for an improved understanding of the history of tsunami inundation in Lake Tokotan and of other locations for which stratigraphic evidence for faint tsunamis layers is not readily apparent from field assessments. © 2020, Springer Nature B.V.
关键词	Computed tomography Hokkaido Radioactive cesium and lead Tsunami deposit
英文关键词	cesium isotope; coastal lagoon; grain size; nondestructive testing; radionuclide; sand; sediment core; tsunami; Hokkaido; Japan
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/205936
作者单位	Center for Research in Isotopes and Environmental Dynamics (CRiED), University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8577, Japan; Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Higashi 1-1-1-C7, Tsukuba, Ibaraki 305-8567, Japan; Department of Earth Sciences, Centre for Natural Hazards Research, Simon Fraser University, 8888 University Dr., Burnaby, BC V5A 1S6, Canada; Division of Marine Science, School of Ocean Science and Technology, University of Southern Mississippi, 1020 Balch Blvd., Stennis Space Center, MS 39529-9904, United States
推荐引用方式 GB/T 7714	Shinozaki T.,Sawai Y.,Ito K.,et al. Recent and historical tsunami deposits from Lake Tokotan, eastern Hokkaido, Japan, inferred from nondestructive, grain size, and radioactive cesium analyses[J],2020,103(1).
APA	Shinozaki T..,Sawai Y..,Ito K..,Hara J..,Matsumoto D..,...&Pilarczyk J.E..(2020).Recent and historical tsunami deposits from Lake Tokotan, eastern Hokkaido, Japan, inferred from nondestructive, grain size, and radioactive cesium analyses.Natural Hazards,103(1).
MLA	Shinozaki T.,et al."Recent and historical tsunami deposits from Lake Tokotan, eastern Hokkaido, Japan, inferred from nondestructive, grain size, and radioactive cesium analyses".Natural Hazards 103.1(2020).