地震学报2011，Vol.33Issue(4)：407-419,13.DOI:10.3969/j.issn.0253-3782.2011.04.001
结合波形互相关的双差定位方法在2008年汶川地震余震序列中的应用
Application of double-difference relocation technique to aftershocks of 2008 Wenchuan earthquake using waveform cross-correlation
摘要
Abstract
We collected seismic records of 4240 3. 0≤Ms≤5. 0 aftershocks of the 2008 Wenchuan earthquake for the period of 12 May 2008 to 31 August 2009. By using waveform cross-correlation and double-difference method, 2441 events of them were relocated. The errors are 0. 4 km in horizontal and 0. 7 km in vertical direction, respectively. It is found that the depth of aftershocks concentrate in 10-20 km range, and the epicenters distribute close to the strike of the central Longmenshan fault. The aftershock epicenters spread in horizontal belt for southwestern section of the aftershock zone, and in vertical belt for northeastern section. The aftershock depth abruptly change from 20 km to 10 km near Beichuan. This implies that the spatial distribution of aftershocks show different characteristics along Longmenshan fault, confirming the previous viewpoint that the fault is thrust in SW, while strike-slip in NE. Comparison of the aftershock relocation result with the existing shallow seismic exploration profiles reveals that the aftershock belts well match the known shallow geological active faults.关键词
双差定位/波形互相关/汶川地震/余震分布Key words
double-difference location method/ waveform cross-correlation/ Wenchuan earthquake/ aftershock distribution分类
天文与地球科学引用本文复制引用
吕鹏,丁志峰,朱露培..结合波形互相关的双差定位方法在2008年汶川地震余震序列中的应用[J].地震学报,2011,33(4):407-419,13.基金项目
国家自然科学基金重点项目(90915012)和科技部科技支撑项目“汶川地震断裂带科学钻探”资助.中国地震局地球物理研究所论著11AC1010. （90915012）
