项目名称: 利用GPS与IM/WS干涉测量监测鲜水河断层变形
项目编号: No.40874003
项目类型: 面上项目
立项/批准年度: 2009
项目学科: 金属学与金属工艺
项目作者: 许才军
作者单位: 武汉大学
项目金额: 52万元
中文摘要: 本项目利用GPS 和WS/IM InSAR 数据研究了鲜水河断层地壳变形。具体研究了WS/IM InSAR 模式干涉处理及拼接方法,拓展了D-InSAR 数据处理理论与方法;进行WS/IM 干涉图时间序列分析,研究了利用GPS+MERIS/MODIS 数据资料、模型以及人工角反射器CR 技术消除InSAR 干涉图中轨道误差和大气延迟误差的方法;研究了利用InSAR与GPS融合建立三维变形场及反演地震震源机制和活动断层参数的方法;通过获取鲜水河和龙门山断层精细的三维形变场图像,考虑地壳结构,采用分段、分层的动力学模式反演确定了鲜水河断层的运动学参数和汶川地震的震源参数及滑动分布;探讨了龙门山断层及其周围地区三维形变信息的时空分布与地震孕育、发生的关系,评估了鲜水河断层发震的危险性。本项目的研究成果不仅对发展地球科学具有重要的理论意义, 而且对于满足国民经济和社会发展的公益性服务需求防震减灾工作也有重大的现实意义。
中文关键词: GPS; IM/WS 干涉测量; 汶川地震; 鲜水河断层;反演
英文摘要: The project studies the crust deformation across and along the Xianshuihe Fault System (XFS) using GPS and WS/IM InSAR data. More details include: A) Interferograms generation from combination of WS/IM pairs and time series construction from WS/IM, and IM/IM pairs. B) The approach determination to estimate water vapour effects and orbital errors in InSAR interferograms using GPS and/or MERIS/MODIS data and corner reflector (CR) technology. C) Construction of high spatial and temporal resolution 3D deformation field integrating GPS,InSAR LOS displacement from ascending and descending orbits, and azimuth offsets map. D) The method of inversion earthquake focal mechanism and active fault parameters. E) Inversion the kinematics parameters of XFS, the earthquake source parameters and sliding distribution of Wenchuan Earthquake based on getting XFS and the longmenshan fault fine 3D image deformation field, considering the layering crustal structure and the dynamic model F) Discussion of the relationship between fault activities and 3D deformation filed and earthquake pregnancy and occurrence, and earthquake potential evaluation along the XFS. These above work will contribute to develop geoscience studies of active deformation,as well as to satisfy the demands for non-profit service from national economy and social development.
英文关键词: GPS; Interferogram of WS/IM; Wenchuan Earthquake; Xianshuihe Fault; Inversion