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首页> 外文期刊>Pure and Applied Geophysics >Contemporary Crustal Deformation Within the Pamir Plateau Constrained by Geodetic Observations and Focal Mechanism Solutions
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Contemporary Crustal Deformation Within the Pamir Plateau Constrained by Geodetic Observations and Focal Mechanism Solutions

机译：PAMIR高原内的当代地壳变形受到大地测量观测和焦点机制解决方案的约束

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We used an updated data set of 192 GPS-derived surface velocities and 393 earthquake focal mechanisms (Mw 3.0, hypocenter depths 30 km) to evaluate the spatial variations in the surface strain rate and crustal stress regime throughout the Pamir Plateau and its surrounding regions. The strain rate field was estimated using the spline in tension approach that solves for the surface velocity in a rectangular grid and the stress field was predicted from focal mechanism solutions using the damped regionalscale stress inversion (DRSSI) method of Hardebeck and Michael (Journal of Geophysical Research, https://doi. org/10.1029/ 2005jb004144, 2006). The results show that the crustal stress field around the Pamir Plateau is predominantly characterized by NNW-SSE compression and E-W extension, which is consistent with the principal orientations of the two-dimensional surface strain rate tensor. This agreement supports the notion that the Pamir and southwestern Tien Shan are uniformly strained blocks. In particular, the fan-shaped rotational pattern between Shmax and the strain rate from the western Pamir to the Tajik Basin shows that the counterclockwise rotation of the Shmax orientation is associated with vertical deformation, which is consistent with the idea of Schurr et al. (Tectonics 33(8): 2014TC003576, 2014) concerning the gravitational collapse and westward extrusion of the crust in the western Pamir. We propose that such a stress-strain pattern, dominated by NNW-ESE oriented compression and E-W trending extension, originated from a combination of the northward push of the Indian continent and the southward subduction of the Tien Shan.
机译：我们使用了一组192个GPS衍生的表面速度和393个地震焦点机制（MW＆GT; 3.0，低速度深度+ 30km）的更新数据集，以评估整个Pamir高原的表面应变率和地壳压力制度的空间变化它的周围地区。使用张力方法的花键估计应变速率场，其求解用于矩形栅格中的表面速度，并且使用Hardebeck和Michael的阻尼地区的局灶性机理解决方案来预测应力场预测应力场（地球物理研究，HTTPS：// DOI。ORG / 10.1029 / 2005JB004144,2006）。结果表明，PAMIR高原周围的地壳应力场主要由NNW-SSE压缩和E-W延伸的特征，其与二维表面应变速率张量的主要取向一致。本协议支持帕米尔和西南天山的概念是统一紧张的块。特别地，Shmax之间的扇形旋转图案与来自西方帕米尔到Tajik盆地的应变速率表明，Shmax取向的逆时针旋转与垂直变形相关，这与Schurr等人的想法一致。 （构造33（8）：2014TC003576,2014）关于帕米尔西部地壳的引力塌陷和向西挤压。我们提出这种压力 - 应变模式，由NNW-ESE取向的压缩和E-W趋势延伸，起源于印度大陆的向北推动和Tien Shan的南部俯冲的组合。

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