SEISMOLOGY AND GEOLOGY ›› 2008, Vol. 30 ›› Issue (4): 917-925.

• Earthquake source physics and model experiment • Previous Articles     Next Articles

DISCUSSION ON RELOCATION AND SEISMO-TECTONICS OF THE MS 8.0 WENCHUAN EARTHQUAKE SEQUENCES

L? Jian1, SU Jin-rong2, JIN Yu-ke3, LONG Feng2, YANG Ya-qiong4, ZHANG Zhi-wei2, TANG Lan-rong1, LI Chao1   

  1. 1. Earthquake Administration of Jiangxi Province, Nanchang 330039, China;
    2. Earthquake Administration of Sichuan Province, Chengdu 610041, China;
    3. Earthquake Administration of Shanxi Province, Taiyuan 030021, China;
    4. Earthquake Administration of Hebei Province, Shijiazhuang 050021, China
  • Received:2008-10-19 Revised:2008-12-09 Online:2008-12-18 Published:2009-11-27

汶川8.0级地震序列重新定位及其发震构造初探

吕坚1, 苏金蓉2, 靳玉科3, 龙锋2, 杨雅琼4, 张致伟2, 汤兰荣1, 李超1   

  1. 1. 江西省地震局, 南昌, 330039;
    2. 四川省地震局, 成都, 610041;
    3. 山西省地震局, 太原, 030021;
    4. 河北省地震局, 石家庄, 050021
  • 通讯作者: 苏金蓉,电话:028-85458894, E-mail:sujr0816@ 163.com.
  • 作者简介:吕坚,男,1975年生,2006年毕业于中国科学技术大学地球物理学专业,获学士学位,工程师,主要从事地震活动性与数字地震学研究,电话:0791-8623543,E-mail:lvjian8438@163.com.
  • 基金资助:
    “十一五”国家科技支撑计划项目(2006BAC01B020102);地震科学联合基金(A07124)共同资助

Abstract: The MS 8.0 Wenchuan earthquake and its 2216 aftershocks were relocated using the double difference algorithm.The horizontal and vertical errors of the 2061 relocated hypocenters are approximately 1~2km and 2~3km,respectively.The epicenter of main shock is approximately 31.00°N,103.38°E,the focal depth is about 13km and the seismogenic structure is the central fault of Longmenshan Fault zone.The total length of spatial distribution of aftershocks along the strike of the fault is about 330km and the predominance distribution of focal depth is 3~20km,which shows obviously the characteristic of segmented activity.The seismicity of the southern part mainly concentrates on the central fault of Longmenshan Fault zone,and some earthquakes occurred on the range-front and range-back faults;the dip of the three faults seems to become gentler gradually from west to east,forming imbricate ruptures.The central fault and Pingwu-Qingchuan Fault of the Longmenshan Fault zone are involved in the seismogenic process,and the seismic rupture is both of thrust napping and right-lateral strike-slipping.

Key words: Wenchuan earthquake, Geiger algorithm, double difference algorithm, seismo-tectonics

摘要: 采用双差定位方法对汶川8.0级地震及其2216次余震进行了重新定位,得到2,061次地震的震源位置,定位结果在水平向和垂直向的估算误差大致为1~2km和2~3km。8.0级主震的震中位置大致为北纬31.00°,东经103.38°,震源深度13km左右,发震构造为龙门山中央断裂。余震震中沿走向分布的总长度为330km左右,震源深度优势分布在3~20km,表现出明显的分段活动特征。南段以龙门山中央断裂活动为主,后山断裂和前山断裂也有地震发生,这3条断裂自西向东倾角似乎逐渐变缓,形成叠瓦状的破裂分布。北段龙门山中央断裂、平武-青川断裂等多条断裂参与了发震过程,地震破裂既有逆冲推覆,也有右旋走滑方式。

关键词: 汶川地震, 盖格定位方法, 双差定位方法, 发震构造

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