Strain rate analysis of the Kyrgyz Tien Shan from GPS and paleomagnetic data

就缩短速率(约20毫米/年)、地震活动性和规模而言，天山是活跃的陆内造山作用的主要例子。这条山脉是印度板块和欧亚板块碰撞的结果。然而，特殊的构造过程(如地壳增厚、持续变形与块体旋转、盆地推覆)以及空间和时间上的变异性仍然知之甚少。全球定位系统站点的大型网络的部署以及一般基于卫星的大地测量提供了以高空间分辨率量化当前形变速率的可能性。该项目的目标是描述实际变形模式的特征，并根据测量不确定性和GPS站点分布提供可信区间。这些结果将通过古地磁数据进一步整合，提供一些定义明确的地块的旋转速度历史。这种多尺度分析将有助于更好地理解特定的构造过程及其复杂的相互作用。在该项目过程中开发的方法将适用于其他构造活动区。最后，研究结果可以改善中亚地区的地震危险性评估。

The Tien Shan is a prime example of active intracontinental orogeny in terms of shortening rates (_20 mm/yr), seismic activity, and dimensions. The mountain range is a result of the collision of the Indian and Eurasian plates. However, the particular tectonic processes (as crustal thickening, continuous deformation vs. block rotation, and basin overthrusting), and the variability both in space and time remain poorly understood. The deployment of large networks of GPS sites and, in general, satellite based geodetic measurements provide the possibility to quantify current deformation rates at a high spatial resolution. The goal of the project is to characterize the actual deformation patterns and to provide confidence intervals based on the measurement uncertainty and the GPS site distribution. These results will be further integrated by paleomagnetic data providing the rotation rate history of some well defined blocks. This multi-scale analysis will help to better understand the particular tectonic processes and their complex interaction. The methods developed in the course of the project will be applicable to other tectonically active regions. Finally, the results can improve seismic hazard assessment in central Asia.