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地震 ›› 1998, Vol. 18 ›› Issue (3): 303-307.

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丽江地震前后川滇地区地壳形变异常强度场及其演化

牛安福, 李旭东, 郑文衡, 柯丽君   

  1. 中国武汉430071 中国地震局地震研究所
  • 收稿日期:1997-11-27 修回日期:1998-01-19 出版日期:1998-07-31 发布日期:2022-09-08
  • 作者简介:牛安福,男, 1964年8月出生, 副研究员, 1996年博士生,主要从事地震孕育过程的演化、前兆异常强度定量化、地震预报及深部构造解释研究
  • 基金资助:
    ①地震科学联合基金会(197066)和国家地震局科研攻关项目(95-04-03-05-01, 96-913-01-01-05)的联合资助课题

ON THE ANOMALY INTENSITY FIELD AND ITS EVOLUTION IN SICHUAN-YUNNAN REGION BEFORE AND AFTER LIJIANG EARTHQUAKE

Niu Anfu, Li Xudong, Zheng Wenheng, Ke Lijun   

  1. Institute of Seismology, CSB, Wuhan 430071, China
  • Received:1997-11-27 Revised:1998-01-19 Online:1998-07-31 Published:2022-09-08

摘要: 地震过程是应变能积累与释放的结果。如何描述积累的程度并对出现的异常进行检测,一直缺少合理的定量化研究。通过对各项观测之间相关性的分析,讨论了地壳形变过程的异常强度指标,并进一步构造了异常强度的空间分布及其演化图像。与地震活动的联系表明,地震多发生在区域异常集中出现后的异常平静时,且远离异常集中区。并证实了地壳形变异常强度与地震应变能积累程度具有密切的相关性。

关键词: 异常强度场, 演化, 地震前兆

Abstract: It is well-known that the earthquake is result from the accumulation and release of strain energy. There has not been quantitative analysis and description for a long time. On the basis of correlation between observed items, the index of anomaly intensity has been researched, and the intensity field evolution images also have been constructed. It is demonstrated that the most earthquakes were occurred during anomaly quiescence and far from the anomaly areas after the regional anomaly concentration. The close relation between anomaly intensity and accumulation of strain is shown in this paper.

Key words: Key w ords: Anomaly intensity field, Evolution, Earthquake precursor