日本南开海槽附近四国岛中全新世相对海平面变化与垂直构造地壳运动

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Island Arc Pub Date : 2022-06-29 DOI:10.1111/iar.12452
Tatsuhiko Yamaguchi, Futoshi Nanayama, Toshimichi Nakanishi, Tomohiro Tsuji, Michiharu Ikeda, Yasuo Kondo, Michiko Miwa, Yohei Hamada
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引用次数: 1

摘要

菲律宾海板块在太平洋西北部南开海槽的欧亚板块下方俯冲,导致地壳变形、特大逆冲地震和海啸事件。四国岛,150 槽西北km处,经历同震和震间变形。随着相对海平面(RSL)的变化,海岸沉积物可能会记录垂直地壳运动。我们研究了四国岛西南部SKM岩芯中的沉积相和微化石介形虫,以寻找全新世中期海啸事件和变形的证据。核心沉积物包括与风暴或海啸事件相对应的九个事件层。利用现代模拟技术,我们从四国岛及其周边地区的SKM岩芯和其他13个岩芯的介形虫组合中估计了RSL。然后,我们从估计的RSL中减去了冰川-水文均衡调整引起的RSL变化,以估计这些岩芯在8.6和4.7 ka之间的垂直构造运动速率。推断的RSL变化表明,自8.6ka以来,Sukumo遗址经历了隆起和沉降。在6.6ka之前,构造地壳运动速率高于现代速率,其空间分布也有所不同。6.6ka之后,构造地壳运动显示出类似的空间模式,并以接近现代地震间速率的速率发生。构造地壳运动的空间格局和速率可能是由四国岛下欧亚大陆和菲律宾海板块断裂区的变化和软流圈的应力条件引起的。一些垂直位移可以用局部活动断层的运动来解释。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Middle Holocene relative sea-level changes and vertical tectonic crustal movements on Shikoku Island near the Nankai Trough, Japan

The Philippine Sea plate subducts beneath the Eurasia plate at the Nankai Trough, northwestern Pacific, causing crustal deformation, mega-thrust earthquakes, and tsunami events. Shikoku Island, 150 km northwest of the trough, experiences both coseismic and interseismic deformation. Coastal sediments potentially record vertical crustal movements as relative sea level (RSL) changes. We studied sedimentary facies and microfossil ostracodes in core SKM from southwestern Shikoku Island for evidence of middle Holocene tsunami events and deformation. The core sediments included nine event layers corresponding to storm or tsunami events. Using modern analog techniques, we estimated RSLs from the ostracode assemblages of core SKM and 13 other cores from Shikoku Island and the surrounding region. Then, we subtracted RSL changes due to glacio-hydro isostatic adjustment from the estimated RSLs to estimate vertical tectonic movement rates in these cores between 8.6 and 4.7 ka. The inferred RSL changes suggest that the Sukumo site has experienced both uplift and subsidence since 8.6 ka. Before 6.6 ka, rates of tectonic crustal movement were higher than the modern-day rate, and its spatial distribution also differed. After 6.6 ka, tectonic crustal movement showed a similar spatial pattern and occurred at rates close to the modern day interseismic rate. The spatial pattern and rates of tectonic crustal movement could be caused by changes in rupture areas between the Eurasia and the Philippine Sea plates beneath the Shikoku Island and in stress condition of the asthenosphere. Some of the vertical displacements can be explained by the movements of local active faults.

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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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