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首页> 外文期刊>Quaternary Science Reviews: The International Multidisciplinary Review Journal >Beach ridges as paleoseismic indicators of abrupt coastal subsidence during subduction zone earthquakes, and implications for Alaska-Aleutian subduction zone paleoseismology, southeast coast of the Kenai Peninsula, Alaska
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Beach ridges as paleoseismic indicators of abrupt coastal subsidence during subduction zone earthquakes, and implications for Alaska-Aleutian subduction zone paleoseismology, southeast coast of the Kenai Peninsula, Alaska

机译：俯冲带地震期间海岸隆起是沿海地震沉陷的古地震指示，对阿拉斯加基奈半岛东南海岸的阿拉斯加-阿留申俯冲带古地震学意义重大

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The Kenai section of the eastern Alaska-Aleutian subduction zone straddles two areas of high slip in the 1964 great Alaska earthquake and is the least studied of the three megathrust segments (Kodiak, Kenai, Prince William Sound) that ruptured in 1964. Investigation of two coastal sites in the eastern part of the Kenai segment, on the southeast coast of the Kenai Peninsula, identified evidence for two subduction zone earthquakes that predate the 1964 earthquake. Both coastal sites provide paleoseismic data through inferred coseismic subsidence of wetlands and associated subsidence-induced erosion of beach ridges. At Verdant Cove, paleo-beach ridges record the paleoseismic history; whereas at Quicksand Cove, buried soils in drowned coastal wetlands are the primary indicators of paleoearthquake occurrence and age. The timing of submergence and death of trees mark the oldest earthquake at Verdant Cove that is consistent with the age of a well documented similar to 900-year-ago subduction zone earthquake that ruptured the Prince William Sound segment of the megathrust to the east and the Kodiak segment to the west. Soils buried within the last 400-450 years mark the penultimate earthquake on the southeast coast of the Kenai Peninsula. The penultimate earthquake probably occurred before AD 1840 from its absence in Russian historical accounts. The penultimate subduction zone earthquake on the Kenai segment did not rupture in conjunction with the Prince William Sound to the northeast. Therefore the Kenai segment, which is presently creeping, can rupture independently of the adjacent Prince William Sound segment that is presently locked. (C) 2015 Elsevier Ltd. All rights reserved.
机译：1964年阿拉斯加大地震发生时，阿拉斯加-阿留申俯冲带的Kenai断层横跨两个高滑动区，是1964年破裂的三个大推力断层（Kodiak，Kenai，Prince William Sound）中最少的研究。在基奈半岛东南沿海的基奈河段东部沿海地区，确定了两次1964年地震之前的俯冲带地震的证据。通过推断湿地的同震沉降和相关的沉降诱发的海滩山脊侵蚀，两个沿海站点都提供了古地震数据。在翠绿湾，古海滩的山脊记录了古地震的历史。而在流沙湾，淹没的沿海湿地中的埋藏土壤是古地震发生和年龄的主要指标。树木的淹没和死亡的时间标志着翠绿湾最古老的地震，这与有据可查的类似于900年前的俯冲带地震的年龄相吻合，该地震使东部和北部的大推力威廉王子湾段破裂。科迪亚克线段向西。最近400-450年内埋没的土壤标志着基奈半岛东南海岸的倒数第二次地震。倒数第二次地震很可能是在公元1840年之前发生的，原因是它没有出现在俄罗斯的历史记录中。基奈河段倒数第二个俯冲带地震并未与东北的威廉王子湾一起破裂。因此，当前蠕动的Kenai段可以独立于当前锁定的相邻William Prince Sound段而破裂。 （C）2015 Elsevier Ltd.保留所有权利。

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