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

新卫星重力、GNSS、SAR和地震数据综合建模对天山结构和动力学的约束

• 批准号: 111515381
• 负责人: Professor Dr.-Ing. Olaf Hellwich
• 金额: --
• 依托单位: Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum (GFZ)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/111515381?language=en
• 关键词: Constraint; Tien; Shan; structure; dynamics

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.

本研究的主要目标是建立中天山的综合模型，该模型基于重力、大地测量和其他地球物理数据的联合分析。该项目的第一阶段提供了本研究的全面背景。所获得的模型应该为理解形成这种结构的持续构造过程开辟一条道路。特别是，通过重力场（包括GOCE数据）和新地震数据的联合反演，将获得新的地壳和上地幔密度模型。接下来，我们将构建岩石圈的流变模型，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 SAR 干涉测量 (DInSAR) 技术得出。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变化很大，仍能够提取变形信号。我们将实施最新的 DInSAR 技术，该技术可以导出天山地区的高分辨率表面变形模型。为此，我们将重点关注不同去相关源的建模，以提高干涉图的质量。该导出的变形模型将与流变模型给出的表面变形模型一起进行分析，这使我们能够开发出可靠的天山演化模型。