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Characteristics of present-day active strain field of Chinese mainland

机译:中国大陆现今活动应变场的特征

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On the basis of the GPS data obtained from repeated measurements carried out in 2004 and 2007, the horizontal principal strain of the Chinese mainland is calculated, which shows that the direction of principal compressive strain axis of each subplate is basically consistent with the P-axis of focal mechanism solution and the principal compressive stress axis acquired by geological method. It indicates that the crustal tectonic stress field is relatively stable in regions in a long time. The principal compressive stress axes of Qinghai-Tibet and Xinjiang subplates in the western part of Chinese mainland direct to NS and NNE-SSW, which are controlled by the force from the collision of the Eurasia Plate and India Plate. The principal compressive strain axes of Heilongjiang and North China subplates in the eastern part direct to ENE-WSW, which shows that they are subject to the force from the collision and underthrust of the Eurasia Plate to the North America and Pacific plates. At the same time, they are also affected by the lateral force from Qinghai-Tibet and Xinjiang subplates. The principal compressive strain axis of South China plate is WNW-ESE, which reflects that it is affected by the force from the collision of Philippine Sea Plate and Eurasia Plate and it is also subject to the lateral force from Qinghai-Tibet subplate. It is apparent from the comparison between the principal compressive strain axes in the periods of 2004-2007 and 2001-2004 that the acting directions of principal compressive stress of subplates in both periods are basically consistent. However, there is certain difference between their directional concentrations of principal compressive stress axes. The surface strain rates of different tectonic units in both periods indicate that the events predominating by compressive variation decrease, while the events predominating by tensile change increase.
机译:根据2004年和2007年重复测量获得的GPS数据,计算出中国大陆的水平主应变,这表明每个副板的主压应变轴的方向与P轴基本一致。震源机制解和地质方法获得的主压应力轴说明长期以来地壳构造应力场相对稳定。中国大陆西部青藏高原和新疆亚板块的主要压应力轴直指NS和NNE-SSW,它们受欧亚大陆板块和印度板块碰撞的力控制。东部黑龙江和华北亚板块的主要压缩应变轴直接指向ENE-WSW,这表明它们受到欧亚大陆板块碰撞和下冲作用到北美和太平洋板块的作用力。同时,它们还受到来自青藏高原和新疆子板块的侧向力的影响。华南板块的主要压缩应变轴是WNW-ESE,这反映了它受菲律宾海板块和欧亚大陆板块碰撞的力的影响,并且还受到青藏高原副板块的侧向力的影响。从2004-2007年和2001-2004年主压应变轴之间的比较可以明显看出,两个时期副板主压应力的作用方向基本一致。但是,它们的主压应力轴的方向集中度之间存在一定差异。两个时期不同构造单元的表面应变率表明,以压缩变化为主的事件减少,而以拉伸变化为主的事件增加。

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