大地测量与地球动力学2012，Vol.32Issue(5)：17-21,26,6.
汶川余震序列北川以北段的震源分布特性与破裂复杂性研究
ON CHARACTERISTICS OF HYPOCENTER DISTRIBUTION AND RUPTURE COMPLEXITY OF WENCHUAN AFTERSHOCK SEQUENCE ALONG LONGMENSHAN FAULT ZONE NORTH TO BEICHUAN
摘要
Abstract
On the basis of precise locations of the Wenchuan earthquake sequence by using the HYPODD method, the focal mechanisms of the aftershocks (M≥5.0) occurred on the Longmenshan fault zone north to Bei-chuan were inversed by using the CAP method and the characteristics of hypocenter distribution and rupture complexity of strong aftershocks are discussed. The results are that the focal depth of Wenchuan aftershock sequence decreased gradually from Yingxiu of Wenchuan to Nanba of Pingwu along Longmen Shan fault zone, which beyond the segment boundary located in Beichuan, and the epicenters were distributed along the Yingxiu-Beichuan-Nanba coseismic surface rupture zone in the Central Fault. The aftershock sequence was characterized as less secondary segmented activity in Central Fault Zone north to Beichuan. The aftershocks (M≥5. 5) were occurred on the end, transition or dislocation of the aftershocks zone. According to the focal mechanism, four of the seven stronger aftershocks are thrust and the others are strike-slip, it may suggest that the process of the aftershock activity was related to the Beichuan-Qingchuan Fault, Pingwu-Qingchuan Fault etc.关键词
汶川地震/余震序列/地震精确定位/震源机制解/发震构造Key words
Wenchuan earthquake/ aftershock sequence/ precise location of earthquake/ focal mechanism/ seis-mogenic structure分类
天文与地球科学引用本文复制引用
吕坚,王晓山,苗春兰,苏金蓉,靳玉科..汶川余震序列北川以北段的震源分布特性与破裂复杂性研究[J].大地测量与地球动力学,2012,32(5):17-21,26,6.基金项目
地震科技星火计划项目(XH12027) （XH12027）
地震行业科研专项(201008007) （201008007）
国家自然科学基金(40973034,41174086) （40973034,41174086）
