时序InSAR断层活动性观测研究进展及若干问题探讨

doi:10.3969/j.issn.0253-4967.2014.03.015

摘要/Abstract

摘要：

基于大量SAR数据的时序InSAR技术已被广泛应用于断裂带震间长期缓慢地壳形变的观测研究，文中对现有多种时序InSAR方法（如Stacking，PSInSAR，SBAS等）的基本原理和技术特点进行了概括总结。采用PSInSAR技术，利用2003—2010年的17景降轨ENVISAT/ASAR数据，在海原断裂带中段开展了震间地壳形变观测的实验研究，获得了海原断裂中段的跨断层InSAR形变速率场整体图像，显示了约5mm/a的左旋走滑运动速率，与GPS和地质学研究基本一致。在此基础上，对时序InSAR断层活动性观测研究中的若干问题，如LOS形变速率与目标断层走向的关系、LOS 形变速率与跨断层观测宽度的关系、LOS 形变速率与GPS等其他形变速率的关系以及LOS 形变速率场揭示的断层相互作用及断层滑动方式等进行了分析探讨。这些将为进一步推进InSAR构造变形监测研究提供参考。

关键词: InSAR, 永久散射体, 干涉图叠加, 断层, 地壳形变

Abstract:

In the past few years, the improved InSAR technology based on time series analyses to many SAR images has been used for measurement of interseismic deformation along active fault. In the paper, we first made a summary and introduction to the basic principle and technical characteristics of existing Time Series InSAR methods(such as Stacking, PSInSAR, SBAS). Then we presented a case study on the central segment of Haiyuan Fault in west China. We attempt to use the PS-InSAR(Permanent Scatter InSAR)technique to estimate the motion rate fields of this fault. We processed and analyzed 17 scenes of ENVISAT/ASAR images in descending orbits from 2003-2010 using the PS-InSAR method. The results reveal the whole movement pattern around the Haiyuan Fault and a remarkable velocity gradient of about 5mm/a across the central segment of the fault. The motion scenes are consistent with left-lateral strike-slip. On this basis, we make a discussion on some issues about observation of fault activity using Time Series InSAR methods, such as the changes of LOS deformation rates with fault strike and region width observed across a fault, fault reciprocity and motion style indicated by Time Series InSAR rate map and the relationship between the InSAR LOS deformation and the ones from other methods. All these studies will benefit the promotion of InSAR application in detection of tectonic movement.

Key words: InSAR, permanent scatter, stacking, fault, crust deformation

中图分类号:

P315.72⁺5

屈春燕, 单新建, 张国宏, 徐小波, 宋小刚, 张桂芳, 刘云华. 时序InSAR断层活动性观测研究进展及若干问题探讨[J]. 地震地质, 2014, 36(3): 731-748.

QU Chun-yan, SHAN Xin-jian, ZHANG Guo-hong, XU Xiao-bo, SONG Xiao-gang, ZHANG Gui-fang, LIU Yun-hua. THE RESEARCH PROGRESS IN MEASUREMENT OF FAULT ACTIVITY BY TIME SERIES INSAR AND DISCUSSION OF RELATED ISSUES[J]. SEISMOLOGY AND GEOLOGY, 2014, 36(3): 731-748.

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