项目名称: 基于改进的Multi-interferogram技术研究亚东-谷露活动构造带现今分段变形特征
项目编号: No.41204004
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 地球物理学和空间物理学
项目作者: 姜文亮
作者单位: 中国地震局地壳应力研究所
项目金额: 26万元
中文摘要: 研究震间断层应变积累对于认识断层运动与地震复发周期等至关重要。PS与SBAS InSAR技术可以捕捉断层活动产生的微弱形变信号,这些方法要求地物在长时间基线上保持稳定的散射特性,但在相干性不稳定、断层活动较弱区域,测量精度受到影响。 为拓展InSAR的应用深度,本立项拟在亚东-谷露裂谷带开展InSAR长期形变监测研究。首先,改进Multi-interferogram断层监测技术与应用流程,基于GPS数据校验InSAR测量精度,获取断裂带分段变形场参数;其次,建立三维断层分段模型,以InSAR测量结果作为约束,根据深部断裂位错模型反演断层滑动速率分布;最后,研究亚东-谷露活动断裂带不同构造分段的运动特征及变形方式,分析地震沿断裂带的迁移分布规律。本项目的研究将为拉萨地区地壳动力学与地震机理研究提供新的认识。
中文关键词: 干涉测量;亚东-谷露构造带;断层参数反演;地震构造模型;构造地貌
英文摘要: In order to understand the dynamics of active fault and reoccurance cycle of earthquake, a better knowledge of the strain accumulation of active fault is significent. PS and SBAS InSAR techniques can capture the weak deformation signal generated by active fault. However, precision of such methods are influenced by decorrelation and other noises greatly. To improve the application of InSAR, we will monitor Yadong-Gulu active fault zone using Multi-interferogram method. We will do as follows: (1) improve the flow of Multi-interferogram method, validate the result with the GPS data, and obtain the deformation fields of different sections of Yadong-Gulu active fault zone; (2) establish the 3D sectionalized fault model, and place constraints on fault slip distribution with InSAR result based on OKADA model; (3) study the movement characteristics and deformation modes on different segments of Yadong-Gulu active fault zone, and analyze the transferring law of earthquake along the fault zone. The anticipated research results will supply some new viewpoints for the study of crustal dynamics and earthquake mechanism in Lhasa block.
英文关键词: InSAR;Yadong-Gulu fault zone;Fault parameter inversion;Seismic structural model;Morphotectonics