Post‐depositional alteration of shallow‐marine tsunami‐induced sand layers: A comparison of recent and ancient tsunami deposits, Onagawa Bay, northeastern Japan
Post‐depositional alteration of shallow‐marine tsunami‐induced sand layers: A comparison of recent and ancient tsunami deposits, Onagawa Bay, northeastern Japan
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浅海海啸诱发沙层的沉积后蚀变：日本东北部女川湾近代和古代海啸沉积物的比较
DOI：
10.1111/iar.12174
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发表时间：
2017
期刊：
影响因子：
1.5
通讯作者：
K. Kogure
中科院分区：
文献类型：
--
作者：
K. Seike;Genki Kobayashi;K. Kogure
事件沉积物或事件沉积记录可以提供有关过去的火山爆发、地震和海啸等自然灾害的信息。在此类沉积物中，海啸沉积物记录了有关引发海啸事件的震级和复发间隔的重要信息（例如 Sawai、Namegaya、Okamura、Satake 和 Shishikura，2012 年；Sukawara、Goto、Imamura、Matsumoto 和 Minoura，2012 年）。然而，此类沉积物可能会被随后的物理过程（Shinozaki, Goto, Fujino, Sugara, & Chiba, 2015; Tamura et al., 2015）和/或生物过程（Seike, Kitahashi, & Noguchi, 2016）改变或消除。海底生物对海啸沉积物的重新殖民可以在事件发生后几个月内开始（Seike、Shirai 和 Kogure，2013 年），沉积后的生物成因改变可以持续更长的时间尺度（Seike 等人，2016 年）。为了清楚地了解海啸沉积物的沉积后蚀变，有必要比较同一地点的现代和古代例子。因此，我们报告了从日本东北部女川湾采集的沉积物核心样本（图 1），其中我们发现
Event deposits, or records of event sedimentation, may provide information on natural hazards such as volcanic eruptions, earthquakes, and tsunamis in the past. Among such deposits, tsunami deposits record important information on the magnitudes and recurrence intervals of the causative tsunami events (e.g. Sawai, Namegaya, Okamura, Satake, & Shishikura, 2012; Sugawara, Goto, Imamura, Matsumoto, & Minoura, 2012). However, such deposits might be modified or obliterated by subsequent physical (Shinozaki, Goto, Fujino, Sugawara, & Chiba, 2015; Tamura et al., 2015) and/or biological processes (Seike, Kitahashi, & Noguchi, 2016). Recolonization of tsunami deposits by benthic organisms can begin within several months of the event (Seike, Shirai, & Kogure, 2013), and post‐depositional biogenic alteration can continue over much longer time scales (Seike et al., 2016). For a clear understanding of the post‐depositional alteration of tsunami deposits, it is necessary to compare recent and ancient examples at the same site. Thus, we report sediment core samples taken from Onagawa Bay, northeastern Japan (Figure 1), in which we found