Constraint on Tien Shan structure and dynamics from integrative modelling of new satellite gravity-, GNSS-, SAR- and seismic data

拟议研究的主要目标是在联合分析重力、大地测量和其他地球物理数据的基础上，建立中天山的综合模型。项目第一阶段提供了这项研究的全面背景。所获得的模型应该为理解形成这一结构的正在进行的构造过程开辟了一条道路。特别是，在重力场(包括GOCE数据)和新的地震数据的联合反演中，将得到新的地壳和上地幔密度模型。接下来，我们将构建一个岩石圈的流变模型，用于分析岩石圈内的表面变形和应力。真实的表面变形将使用现代差分合成孔径雷达(DInSAR)技术来计算。该项目的第一阶段提供了高质量的DInSAR处理链，并显示出尽管该地区地形高度多变，仍能提取形变信号的能力。我们将实施最新的DInSAR技术，允许在天山地区建立高分辨率的地表形变模型。为此，我们将重点研究不同解相关源的模型化，以提高干涉图的质量。将得到的变形模型与一个流变模型给出的地表变形模型一起进行分析，这使我们能够建立一个可靠的天山演化模型。

The main goal of the proposed study is construction of an integrated model of Central Tien Shan, which is based on a joint analysis of the gravity, geodetic and other geophysical data. A comprehensive background for this study is provided by the 1st stage of the project. The obtained model should open a way for understanding of the ongoing tectonic processes forming this structure. In particularly, a new density model of the crust and upper mantle will be obtained in a joint inversion of the gravity field (including the GOCE data) and the new seismic data. Next, we are going to construct a rheological model of the lithosphere, which will be employed for analysis of surface deformations and stresses within the lithosphere. Real surface deformations will be derived using modern Differential SAR Interferometry (DInSAR) techniques. The first stage of the project provided a high quality DInSAR treatment chain and shows the capability to extract a deformation signal despite the highly variable topography in the area. We are going to implement recent DInSAR techniques that allow to derive highresolution surface deformation model over the Tien-Shan region. For this, we will focus on the modelisation of different decorrelation sources in order to increase the quality of interferograms. This derived deformation model will be analysed together with surface deformation model given by a rheological model, which enables us to develop a reliable model of the Tien Shan evolution.