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地震 ›› 1999, Vol. 19 ›› Issue (4): 315-322.

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张北6.2级地震地形变前兆演化特征

车兆宏1), 谢觉民2), 张晶3), 范燕1)   

  1. 1)中国北京 100039中国地震局综合观测中心
    2)中国天津 300180中国地震局第一地形变监测中心
    3)中国北京 100036中国地震局分析预报中心
  • 收稿日期:1999-01-18 修回日期:1999-03-09 出版日期:1999-10-31 发布日期:2022-09-23
  • 作者简介:车兆宏,男, 1940年9月出生,研究员,主要从事地壳形变、地震预报研究工作。

PRECURSORY EVOLUTION CHARACTERISTICS OF GROUND DEFORMATION BEFORE ZHANGBEI MS 6.2 EARTHQUAKE

Che Zhaohong1), Xie Juemin2), Zhang Jing3), Fan Yan1)   

  1. 1) Center for Comprehensive Surveying, CSB, Beijing 100039, China
    2) First Crustal Deformati on Monitoring Center, CSB, Tianjin 300180, China
    3) Center for Analysis and Prediction, CSB, Beijing, 100036, China
  • Received:1999-01-18 Revised:1999-03-09 Online:1999-10-31 Published:2022-09-23

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摘要： 分析了张北6.2级地震前后华北地区水准、GPS、重力、定点形变、流动形变、地应变观测资料及前兆的演化过程。结果表明,深大构造对背景场起着控制及传递的作用;震中区位于经历了剧烈地壳运动后近年处于相对平静的地区;背景场与前兆异常动态过程的密切配合,是作出正确震情判定的关键;前兆异常在震后的新发展,在震后趋势预测中有重要作用。

关键词: 地形变, 前兆异常, 演化特征, 张北地震

Abstract: We have analyzed the evolutional process of precursors, including observational data of leveling， GPS, gravity, deformation at fixed observ ational sites, mobile geodetic deformation and ground strain beforeand after the Zhangbei Ms 6. 1 earthquake. The results indicate that the deep-seated major fault plays a controlling and transferring role for the background field, and the epicentral region is situated at the relatively quiet region in recent years， which has experienced violent crustal movement. The closed coordination of background field with dynamic process of precursory anomaly is a key to the correct seismic situation determination. The new development of precursory anomaly after the earthquakeis of great significance in postseismic trend prediction.

Key words: Ground deformation, Precursory anomaly, Evolution characteristics, Zhang bei Earthquake