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

利用 GPS 和古地磁数据分析吉尔吉斯天山的应变率

• 批准号: 207156275
• 负责人: Professor Dr. Valerian Bachtadse
• 金额: --
• 依托单位: Sektion Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/207156275?language=en
• 关键词: Strain; rate; analysis; Kyrgyz; Tien

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.

就缩短速率（20毫米/年）、地震活动性和规模而言，天山是活跃的陆内造山带的一个典型例子。这座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，连续变形与块体旋转，盆地逆冲推覆），以及在空间和时间的变化仍然知之甚少。全球定位系统站点大型网络的部署以及一般而言基于卫星的大地测量提供了以高空间分辨率量化当前变形率的可能性。该项目的目标是确定实际变形模式的特征，并根据测量不确定性和全球定位系统站点分布提供置信区间。这些结果将进一步整合古地磁数据提供一些明确的块体的旋转速率的历史。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跃地区。最后，研究结果可以改善中亚地区的地震危险性评估。

项目成果

Velocity covariance in the presence of anisotropic time correlated noise and transient events in GPS time series

• DOI: 10.1016/j.jog.2013.08.007
• 发表时间: 2013-12-01
• 期刊: JOURNAL OF GEODYNAMICS
• 影响因子: 2.3
• 作者: Hackl, Matthias;Malservisi, Rocco;Jiang, Yan
• 通讯作者: Jiang, Yan