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地震 ›› 2011, Vol. 31 ›› Issue (2): 1-10.

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汶川MS8.0地震及余震序列重新定位

赵博, 石玉涛, 高原   

  1. 中国地震局地震预测研究所, 北京 100036
  • 收稿日期:2010-06-01 修回日期:2010-11-04 出版日期:2011-04-30 发布日期:2021-09-09
  • 作者简介:赵博(1984-), 男, 陕西渭南人, 2010年硕士研究生毕业, 主要从事数字地震学等研究。
  • 基金资助:
    中国地震局地震预测研究所基本科研专项(2008-09)和地震行业科研专项重大项目(201008001)资助

Relocation of the Wenchuan MS8.0 Earthquake Sequence

ZHAO Bo, SHI Yu-tao, GAO Yuan   

  1. Institute of Earthquake Science, CEA, Beijing 100036, China
  • Received:2010-06-01 Revised:2010-11-04 Online:2011-04-30 Published:2021-09-09

摘要: 从2008年5月12日汶川8.0级地震发震时刻起到2008年12月31日, 四川省及其周边省区布设的区域台网、 水库台网以及流动台共记录到10000余次余震序列(M≥2.0)。 我们采用双差定位法对主震及余震序列进行重新定位, 得到7000多个地震的重新定位结果。 结果表明, 余震分布带长约350 km。 在西南部, 余震沿龙门山后山、 中央以及前山断裂分布; 在中段, 余震主要沿龙门山中央断裂分布; 在北段, 余震横穿青川—平武断裂分布。 余震震源深度主要分布在10~20 km, 重新定位后的平均震源深度为13 km。

关键词: 双差定位法, 汶川地震, 余震序列, 龙门山断裂带

Abstract: From the origin time of May 12, 2008, MS8.0 Wenchuan earthquake to Dec.31, 2008, more than 10000 aftershocks(M≥2.0) had been recorded by the seismic network in Sichuan and the surrounding provinces. In the paper, the main shock and more than 7000 aftershocks were relocated using the double difference algorithm. The results show that the length of aftershock distribution is about 350 km. In the southwest, the distribution of aftershocks is along the Back-range, the Central and the Front-range of the Longmenshan fault. In the middle, the distribution of aftershocks is along the Central fault. In the North, the aftershocks distributed across the Qingchuanr-Pingwu fault. The depths of aftershocks mainly located in the 10~20 km, and the average depth of aftershocks is 13 km after relocation.

Key words: Earthquake location, Double difference algorithm, Wenchuan MS8.0 earthquake

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