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.

拟议研究的主要目标是建立一个综合模型的中央天山，这是基于联合分析的重力，大地测量和其他地球物理数据。项目第一阶段为这项研究提供了全面的背景。所获得的模型应该打开一个正在进行的构造过程形成这种结构的理解的方式。特别是通过重力场（包括GOCE数据）和新的地震资料的联合反演，将获得新的地壳上地幔密度模型。其次，我们将建立一个岩石圈的流变学模型，它将被用来分析岩石圈内的表面变形和应力。真实的地表变形将使用现代差分合成孔径雷达干涉测量（DInSAR）技术得出。该项目的第一阶段提供了一个高质量的差分干涉合成孔径雷达处理链，并显示出尽管该地区地形变化很大，但仍有能力提取变形信号。我们将实施最新的DInSAR技术，可以得到高分辨率的地表形变模型在天山地区。为此，我们将专注于不同的去相关源的建模，以提高干涉图的质量。这个变形模型将与由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。