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地震 ›› 2009, Vol. 29 ›› Issue (1): 15-25.

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汶川8.0级地震序列及震型判定

程万正, 阮祥, 张致伟   

  1. 四川省地震局, 四川 成都 610041
  • 收稿日期:2008-09-16 修回日期:2008-10-15 出版日期:2009-01-31 发布日期:2021-10-15
  • 作者简介:程万正(1950-), 男, 四川井研人, 研究员, 主要从事地震学和地震预报等研究。
  • 基金资助:
    国家科技行业专项(200808053)和支撑计划项目(2006BA-01B02-01-01)

The Wenchuan MS8.0 Earthquake Sequence and Shock Type Determination

CHENG Wan-zheng, RUAN Xiang, ZHANG Zhi-wei   

  1. Earthquake Administration of Sichuan Province, Chengdu 610041, China
  • Received:2008-09-16 Revised:2008-10-15 Online:2009-01-31 Published:2021-10-15

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摘要： 研究了2008年5月12日四川省汶川8.0级地震余震序列, 其特点是: 余震序列丰富, 持续时间长。 余震沿NE向龙门山构造带的中央断裂条形展布, 深度横剖面为锲形, 呈现地块间强烈汇聚、 挤压活动的特点。 跨不同断裂段, 余震震源机制解有逆冲、 斜滑或走滑型, 反映的局部构造应力场复杂。 汶川8.0级地震序列为主震-余震型, 文中给出了其判定的主要依据及分析预测结果。

关键词: 汶川8.0级地震, 余震分布, 分段特征, 震型判定

Abstract: This article studies the aftershock sequence of the Wenchuan MS8.0 earthquake on May 12, 2008, Sichuan province. It is characterized by abundant aftershock sequence and long duration. The aftershocks distribute along the central Longmenshan fault zone extending NE and form a narrow strip and a wedgy distribution in transverse depth profile, which present characteristics of strong convergence and compressive activities between blocks. The focal mechanism of the aftershocks have thrust oblique-slip or strike slip faulting and present complex local tectonic stress field. The Wenchuan MS8.0 earthquake sequence was determined to be mainshock-aftershock type, and the main judgment references and analysis results are also given in this article.

Key words: Wenchuan MS8.0 earthquake, Aftershock distribution, Segmentation feature, Shock type determination

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