首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >An Andean model of interplate coupling and strain partitioning applied to the flat subduction zone of SW Japan (Nankai Trough)
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An Andean model of interplate coupling and strain partitioning applied to the flat subduction zone of SW Japan (Nankai Trough)

机译:日本西南部(南海海槽)平坦俯冲带板间耦合和应变分配的安第斯模型

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摘要

Transcurrent motion is commonly observed in cases of oblique subduction, yet the causes remain controversial. A model of increased interplate coupling linked to flat subduction is proposed as a mechanism for producing strain partitioning at a great distance (several hundred km) from the trench. The model, originally developed for the North Andean margin, is applied to the geodynamics of SW Japan. Here, along the Nankai Trough and below adjacent SW Honshu, Aat subduction occurs due to the relatively young age (<20 Ma) of the oceanic lithosphere and the buoyancy of the flanking Palau-Kyushu Ridge and the Izu Bonin are. Although dextral strike-slip motion occurs along the median tectonic line (MTL) in Shikoku as shown by GPS studies, it has remained seismically inactive for the last 1000 years. Evidence is presented supporting a second transcurrent fault system to the north of the MTL, the North Chugoku Shear Zone, associated with four M 7 and nine additional M greater than or equal to 6 earthquakes in the past 300 years. Dextral strike-slip focal mechanisms for 15 modern and historical events indicate a significant degree of subduction-related strain partitioning manifested by right-lateral strike-slip faulting along the adakitic volcanic are, some 400 km from the Nankai Trough. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 68]
机译:在斜向俯冲的情况下通常会观察到横流运动,但是原因仍然存在争议。提出了一种与平板俯冲相关的增加板间耦合的模型,作为一种在距沟槽很远的距离(几百公里)处产生应变分配的机制。该模型最初是为北安第斯山脉边缘开发的,已应用于日本西南部的地球动力学。在这里,沿着南海海槽和本州西南海域以下,由于海洋岩石圈的年龄相对较小(<20 Ma),并且侧翼的帕劳-九州海岭和伊豆波宁的浮力,Aat俯冲发生了。尽管GPS研究表明,右旋走滑运动沿四国的中线构造线(MTL)发生,但在过去的1000年中,它一直没有地震活动。提出的证据表明,过去300年来,MTL以北的第二个跨流断层系统即北中国剪切带,与4次M级大于或等于7级地震和9次M级大于或等于6级地震有关。 。 15个现代和历史事件的右旋走滑震源机制表明,与南俯海槽相距约400 km的沿右旋走滑断层所形成的与俯冲有关的应变分区程度显着。 (C)2001 Elsevier Science B.V.保留所有权利。 [参考:68]

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