Identifying possible tsunami deposits on the Shizuoka Plain, Japan and their correlation with earthquake activity over the past 4000 years
Identifying possible tsunami deposits on the Shizuoka Plain, Japan and their correlation with earthquake activity over the past 4000 years
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确定日本静冈平原上可能存在的海啸沉积物及其与过去 4000 年地震活动的相关性
DOI：
10.1177/0959683613505345
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Hideki Mori
中科院分区：
文献类型：
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作者：
A. Kitamura;O. Fujiwara;K. Shinohara;Shiho Akaike;T. Masuda;Kazuki Ogura;Y. Urano;Konatsu Kobayashi;Chikako Tamaki;Hideki Mori
在日本中部静冈海岸的泻湖泥层序列中，记录了三个厚度从15到34厘米不等的冲刷砂层，该序列面向骏河海槽。沙床是由海水淹没形成的分类良好、圆润的沙滩砂组成的。基底侵蚀面、泥质碎屑、逆级配和正级配均存在，表明该砂层是高能沉积的结果。砂层呈多层状，砂层与泥幔交替较好，与长周期波列沉积相一致。从三个冲积层获得的放射性碳测年分别为公元1000、3565-3486 calyr BP和4000 calyr BP。硅藻组合的垂直变化表明，流入第二沙床的海水逐渐增加，随后在沙床上方迅速转变为淡水条件。海水流入的逐渐增加在第二个沙床上方再次开始。这一系列的环境变化具有震间沉降和同震隆升的特征。研究区在1854年安西东海地震（Mw 8.4）期间经历了约1米的隆起。与此相反，该区域在今震间期逐渐沉降（约6 mm/yr）。最年轻的沙层可能与公元1096年的会县地震有关，那次地震对静冈县沿岸造成了严重破坏。
Three washover sand beds, ranging from 15 to 34 cm in thickness, were recorded in a lagoonal mud sequence on the Shizuoka coast of central Japan, which faces the Suruga Trough. The sand beds were composed of well-sorted and well-rounded beach sand derived by a marine inundation. The basal erosion surface, mud clasts, and presence of both inverse and normal grading suggest that the sand beds formed as a result of high-energy deposition. The sand beds are multilayered, with fine alternations of sand sheets and mud drapes, which are consistent with deposition from a long-period wave train. Radiocarbon dates obtained from the three washover deposits are around ad 1000, 3565–3486 cal. yr BP, and 4000 cal. yr BP. Vertical changes in the diatom assemblages suggest a gradually increasing inflow of seawater up to the second sand bed, followed by a rapid change to freshwater conditions just above the bed. The gradual increase of seawater inflow begins again just above the second sand bed. We conclude that this series of sequential environmental changes indicates interseismic subsidence and coseismic uplift. The study area experienced around 1 m of uplift during the ad 1854 Ansei Tokai earthquake (Mw 8.4). In contrast, the area has subsided gradually (c. 6 mm/yr) during the present interseismic period. The youngest sand bed may be correlated with the ad 1096 Eicho earthquake, which caused severe damage along the Shizuoka coast.
YOKO OTA 等人：“根据美国华盛顿州纳塞尔河口的埋藏森林和埋藏泥炭估算的古地震活动”第四纪研究。
DOI：
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通讯作者：
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DOI：
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发表时间：
2004
期刊：
Science 306(5703)
影响因子：
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作者：
Sawai;Y.;K.Satake;T.Kamataki;H.Nasu;M.Shishikura;T.Nagumo et al.Horton;H.M.Kelsey;T.
通讯作者：
T.