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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Crustal velocity field of southwest Japan: Subduction and arc-arc collision
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Crustal velocity field of southwest Japan: Subduction and arc-arc collision

机译：日本西南部地壳速度场：俯冲和弧-弧碰撞

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We investigate crustal deformation in southwest japan over a 3-year period revealed by a permanent dense Global Positioning System (GPS) array. Southwest Japan is a part of the Amurian Plate, a microplate moving about 10 mm/yr toward the east with respect to the Eurasian Plate. It overrides the Philippine Sea Plate at the Nankai Trough and collides with the northeast Japan are in the central part of Japan. In this paper we first derive GPS site velocities relative to the stable part of the Amurian Plate in order to isolate signals of crustal deformation caused by the subduction and/or the collision. The velocity field has a conspicuous feature indicating the interseismic elastic loading by the Philippine Sea Plate slab at the Nankai Trough, characterized by the northwestward movements of points throughout the studied area. Their amplitudes are the largest at the Pacific coast and decay toward the Japan Sea coast with a subtle systematic shift of azimuths. A model assuming an elastic half-space, the convergence rate at the Nankai Trough based on a refined Euler vector, and the strength of the coupling inferred from a thermal model, could explain the velocity field in the western part of the studied area to a large extent. Those in the eastern part systematically deviate from them, and the residual components there show east-west shortening and north-south extension. This may represent crustal thickening and trenchward extrusion of crustal blocks caused by the collision between southwest and northeast Japan. This suggests that the collision between southwest and northeast Japan gives rise to not only crustal thickening but also trenchward extrusion of crustal block. A velocity contrast was found across the Median Tectonic Line, the largest inland active fault in Japan, but the current permanent GPS network is not dense enough for us to discuss its coupling depth. [References: 65]
机译：我们调查了由永久密集的全球定位系统（GPS）阵列揭示的3年期间日本西南部的地壳变形。日本西南部是阿穆里板块的一部分，是一个相对于欧亚板块向东移动约10毫米/年的微板块。它超越了南海海槽中的菲律宾海板，并与日本东北部发生碰撞，位于日本中部。在本文中，我们首先导出相对于阿穆里板块稳定部分的GPS位置速度，以便隔离由俯冲和/或碰撞引起的地壳变形信号。速度场具有明显的特征，表明菲律宾海板在南海海槽处的地震弹性载荷，其特征是整个研究区域内点的西北移动。它们的振幅在太平洋海岸最大，并随着方位角的细微系统偏移而向日本海海岸衰减。假设有一个弹性半空间的模型，一个基于精细欧拉矢量的南开海槽的收敛速度，以及根据热模型推断出的耦合强度，可以将研究区域西部的速度场解释为很大程度上。东部的那些有系统地偏离它们，并且那里的剩余成分显示出东西向的缩短和南北向的延伸。这可能代表了日本西南与东北之间的碰撞造成的地壳增厚和地壳挤压。这表明日本西南部和东北部之间的碰撞不仅引起地壳增厚，而且还引起地壳块的向外挤压。在日本最大的内陆活动断层正中构造线上发现了速度对比，但是目前的永久GPS网络不够密集，无法让我们讨论其耦合深度。 [参考：65]

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