Identification and possible recurrence of an oversized tsunami on the Pacific coast of northern Japan
Identification and possible recurrence of an oversized tsunami on the Pacific coast of northern Japan
复制标题
日本北部太平洋沿岸特大海啸的识别和可能再次发生
DOI：
10.1007/s11069-013-0640-z
复制
发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Minoura;K.;Hirano;S.;and Yamada;T.
在日本北方发现了严重海啸淹没的地质证据。在东北最北端的下北沙丘地区，我们发现了两个独特的沙层，它们是海啸沉积物。超过20米的爬升高度和至少1.4公里的内陆淹没明显大于日本任何已知的历史案例。据认为，造成这些沉积物的海啸地震发生在近700年前的千岛前弧-海沟系统。起源于千岛俯冲带的大海啸的复发间隔约为400年。考虑到最近一次异常大地震发生在公元1611年（相当于庆町地震海啸），这里提出的研究结果增加了袭击日本北方太平洋沿岸的特大海啸的可能性和危险性。
Geological evidence of severe tsunami inundation has been discovered in northern Japan. In the dune fields of Shimokita, in northernmost Tohoku, we have found two distinctive sand layers that are tsunami deposits. The run-up height of >20 m and inland inundation of at least 1.4 km are notably larger than any known historical case in Japan. The tsunami-genic earthquake that resulted in these deposits is thought to have taken place in the Kuril Forearc-Trench system nearly 700 years ago. The recurrence interval of major tsunamis originating in the Kuril subduction zone is about 400 years. Given that the most recent unusually large earthquake took place in AD 1611 (corresponding to the Keicho earthquake tsunami), the findings presented here increase the potential and hazard for an outsized tsunami striking the Pacific coast of northern Japan.