globalchange  > 气候变化与战略
DOI: 10.1007/s11069-020-04007-7
论文题名:
Recent and historical tsunami deposits from Lake Tokotan, eastern Hokkaido, Japan, inferred from nondestructive, grain size, and radioactive cesium analyses
作者: Shinozaki T.; Sawai Y.; Ito K.; Hara J.; Matsumoto D.; Tanigawa K.; Pilarczyk J.E.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2020
卷: 103, 期:1
起始页码: 713
结束页码: 730
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/168735
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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

Recommended Citation:
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]. Natural Hazards,2020-01-01,103(1)
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