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地震 ›› 2009, Vol. 29 ›› Issue (1): 141-148.

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汶川8.0级地震及余震破裂的地质构造特征

田勤俭1,2, 刁桂苓3, 郝平2, 冯向东3, 孙晴3   

  1. 1.中国地震灾害防御中心, 北京 100029;
    2.中国地震局地震预测研究所, 北京 100036;
    3.河北省地震局, 河北 石家庄 050021
  • 收稿日期:2008-09-26 修回日期:2008-10-22 出版日期:2009-01-31 发布日期:2021-10-15
  • 作者简介:田勤俭(1966-), 男, 河北徐水人, 研究员, 主要从事地震构造、 工程地震等研究。
  • 基金资助:
    地震行业科研专项经费项目(20070851); 国家重点基础研究发展规划项目(2004CB418401);中国地震局地壳应力研究所基本科研业务专项(2008); 国家科技支撑项目(2006BAC13B01-0202)

Earthquake Geology of the Wenchuan M8.0 Mainshock and its Aftershocks

TIAN Qin-jian1,2, DIAO Gui-ling3, FENG Xiang-dong3, SUN Qing3, HAO Ping2   

  1. 1. China Earthquake Disaster Prevention Center, Beijing 100029, China;
    2. Institute of Earthquake Science, CEA, Beijing 100036, China;
    3. Earthquake Administration of Hebei Province, Shijiazhuang 050021, China
  • Received:2008-09-26 Revised:2008-10-22 Online:2009-01-31 Published:2021-10-15

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摘要： 汶川8.0级地震是发生在龙门山断裂带上的大地震。 文中应用地震地表破裂调查资料、 余震分布和震源机制资料, 论述了该次地震的主破裂、 次级破裂、 触发破裂等方面的地质特征。 认为该次地震的主破裂长约200 km, 分为南、 北两段。 南段以逆冲破裂为主, 由两条破裂带构成, 并引起上盘多条近平行的次级断裂带的破裂; 北段以右旋逆冲破裂为主, 由单条破裂带构成; 在主破裂的东北方向, 触发了长约100 km的余震活动。 汶川8.0级地震的破裂特征, 对研究龙门山断裂带其他段落的强震危险性具有重要意义。

关键词: 汶川8.0级地震, 龙门山断裂, 地震地表破裂, 震源机制, 余震分布

Abstract: The Wenchuan M8 earthquake occurred on the Longmenshan fault zone. Based on field investigation of the surface rupture and focal mechanism study of the aftershocks, we studied the geological relationship of main rupture, secondary rupture and trigged rupture. The main rupture is about 200 km long which can be divided into the south part and north part. The south part consists of two parallel fault zones mainly reverse, with several parallel secondary ruptures on the hanging wall of the main fault, and the north part is a single main fault zone characterized with lateral strike slip and reverse faulting. Comparing with 300 km long aftershock distribution, the surface rupture only occupy 200 km of them, and the left 100km on the northeast of the main rupture were triggered earthquakes. The Earthquake geology results of this paper may be useful for studying the earthquake risk evolution on the Longmenshan fault system.

Key words: Wenchuan M8.0 earthquake, Longmenshan fault, Surface rupture, Focal mechanism, Aftershocks

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