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

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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.