2008年11月10日和2009年8月28日，位于青藏高原东北缘的大柴旦地区在相距仅几公里的空间内先后发生两次Mw 6.3级地震。如此小的空间在不足一年时间内复发Mw 6.3级地震，在全球范围内比较罕见，相关的科学问题为人类认识该区域的构造活动带来了机遇和挑战。InSAR技术已在地震研究中应用十分广泛，然而，至今尚未见到：1）顾及震后形变衰减特征、粗差观测的时序分析方法；2）对两次大柴旦地震同震和震后形变的综合研究。本项目旨在利用InSAR技术联合确定两次事件的同震和震后滑移的时空演变格局。重点研究顾及震后形变非线性衰减特征和粗差观测的InSAR时序分析方法、两次事件的高时空分辨率高精度同震和震后位移的提取、两次事件的同震和震后滑移时空演变格局的联合确定。研究成果能够为解释两次事件的发展发生过程提供定量依据，提升InSAR技术在地震研究中的应用水平，加速我国地震科学研究的发展。

On November 10, 2008 and August 28, 2009, two Mw 6.3 earthquakes with only a few kilometers apart occurred in Dachaidan zone located at the northeastern margin of the Qinghai-Tibet Plateau. Such a small region in less than a year experiencing two Mw 6.3 earthquakes, is relatively rare around the world. The related scientific issues give human opportunities and challenges to understand the tectonic activity in the region. InSAR technique has been widely used in earthquake study. However, we still do not see: 1) the method of the time series analysis by considering the decay characteristic of the postseismic deformation and the existence of the gross observation; 2) the comprehensive study about the coseismic and postseismic deformation of the two Dachaidan earthquakes. This project aims to jointly determine the temporal-spatial evolution pattern of the coseismic and postseismic slip of the two events with the use of InSAR technique. Research is mainly focused on three parts. The first is the method of InSAR time series analysis by considering the nonlinear decay characteristic of the postseismic deformation and the existence of the gross observation. The second is the extraction of the coseismic and postseismic displacements of the two events with high temporal-spatial resolution and precision. The final is the joint determination of the temporal-spatial evolution pattern of the coseismic and postseismic slip of the two events. The research results can provide a quantitative basis for explaining the developing and occurring processes of the two events, enhance the application level of the InSAR technique in the earthquake study, and accelerate the development of the earthquake science in China.