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地震 ›› 2002, Vol. 22 ›› Issue (1): 61-69.

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西南地区强震前后地壳变形异常强度场特征研究

牛安福, 张晶, 延旭东, 吉平   

  1. 中国地震局分析预报中心,北京 100036
  • 收稿日期:2001-03-07 修回日期:2001-05-25 出版日期:2002-01-31 发布日期:2021-12-21
  • 作者简介:牛安福(1964-),男,山东单县人,研究员,2000年获博士学位,主要从事地震预报、形变与地球动力学研究。

On the characteristics of anomaly deformation field around strong earthquakes in Southwest China area

NIU An-fu, ZHANG Jing, YAN Xu-dong, JI Ping   

  1. Center for Analysis and Prediction, CSB, Beijing 100036, China
  • Received:2001-03-07 Revised:2001-05-25 Online:2002-01-31 Published:2021-12-21

摘要: 采用标准化的F统计量给出了异常强度的定量描述方法,在变形监测台点比较密集的西南地区构造了变形异常强度场。通过对异常特征空间分布随时间演化图像及强地震前后变形异常分布图像的研究,讨论了地震成组活动模式下变形空间分布的特点及变形异常分布的非均匀性特征。探讨了变形异常集中区与平静区(变形空区)与地震活动空区之间的关系,以及地震活动空区内外小震活动与变形场分布之间的微动态联系。

关键词: 地壳变形, 异常强度, 强地震, 西南地区

Abstract: In this paper, an anomaly intensity is proposed basedon the Fisher statistic quantity, and the anomaly intensity field for deformation is alsocreated in the Southwest China area atdenser monitoring sites. Analy zing the anomaly pattern, the inhomogeneous characteristics and its evolution are discussed under assuming the seismic activity in group. The relation between deformation anomaly-concentrated area (or deformation gap) and seismic gap, and the relation between seismic activity and anomaly intensity field with in and outside the seismic gap are explored.

Key words: Crustal deformation, Anomaly intensity, Strong earthquake, Southwest Chi-na area

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