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首页> 外文期刊>Journal of Asian earth sciences >Spatial variations of the crustal stress field in the Philippine region from inversion of earthquake focal mechanisms and their tectonic implications
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Spatial variations of the crustal stress field in the Philippine region from inversion of earthquake focal mechanisms and their tectonic implications

机译：地震震源机制反演对菲律宾地区地壳应力场的空间变化及其构造意义

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This paper presents the spatial variations in the crustal stress field for the Philippine region. Based on the stress configuration, we divided the stress regime in the area of the Philippines into four parts: (1) Trench-perpendicular compressive stress axes (sigma(1)) with an intermediate plunge were observed along the eastern subduction systems of the Philippine Mobile Belt (PMB), which suggests that the subduction of the Philippine Sea Plate (PSP) is the primary factor controlling the stress distribution. (2) Characterized by systematically rotated sigma(1) with very shallow plunge, the central-western portion of the Philippines appears to be largely affected by the collision between the Palawan Block and the PMB. (3) The sigma(1) distribution in the northern part of Luzon Island (north of 14 degrees N) is compatible with the plate motion of the PSP, whereas the extensional axes (sigma(3)) has a fan-shaped stress signature with N-S direction at the south and a more spreading direction to the north, which implies its north escapement. (4) Bounded by the Scarborough Seamount, the northern and southern portions of the Manila Trench reveal a very distinct stress pattern with a trench-parallel sigma(3) to the north and a trench-perpendicular sigma(3) to the south. This observation may infer a potential effect caused by the presence of the oceanic bathymetric highs on the behavior of the subduction process. In addition to the identification of the four provinces with different stress regimes, we suggest that the Philippine Fault Zone may play an important role to alter the stress state in the region of the Philippines. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本文介绍了菲律宾地区地壳应力场的空间变化。根据应力分布，我们将菲律宾地区的应力状态分为四个部分：（1）在菲律宾东部俯冲系统中观察到沟槽-垂直压缩应力轴（sigma（1）），中间有一个突入。移动带（PMB），这表明菲律宾海床（PSP）的俯冲是控制应力分布的主要因素。 （2）菲律宾中西部地区的特征是系统旋转的sigma（1）并具有非常浅的下降，似乎受到巴拉望区块与PMB之间碰撞的影响很大。 （3）吕宋岛北部（北纬14度）的sigma（1）分布与PSP的板块运动兼容，而延伸轴（sigma（3））具有扇形应力特征NS方向向南，向北扩展，这意味着它向北逃逸。 （4）在斯卡伯勒海山的边界上，马尼拉海沟的北部和南部部分显示出非常独特的应力模式，其北部为与沟槽平行的sigma（3），南部为与沟槽垂直的sigma（3）。该观察结果可以推断出由于海洋测深高的存在对俯冲过程行为的潜在影响。除了确定四个具有不同压力机制的省份，我们还建议菲律宾断层带可能在改变菲律宾地区的压力状态中起重要作用。 （C）2017 Elsevier Ltd.保留所有权利。

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