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地震 ›› 2005, Vol. 25 ›› Issue (2): 75-82.

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大姚地震前连续形变短期前兆特征

张立1,4, 牛安福2, 汤曙恩3, 王永安1   

  1. 1.云南省地震局, 云南 昆明 650041;
    2.中国地震台网中心, 北京 100036;
    3.昆明市防震减灾局, 云南 昆明 650011;
    4.中国科学技术大学地球和空间科学学院, 安徽 合肥 230026
  • 收稿日期:2004-06-14 修回日期:2004-08-01 出版日期:2005-04-30 发布日期:2021-11-10
  • 作者简介:张立(1963-), 女, 四川南充人, 高级工程师, 主要从事地震前兆及地震预报等研究。
  • 基金资助:
    “十五”科技部攻关项目(2004BA601B-03-02)

Successive deformation short-term precursor chara- cteristics before the Dayao earthquake

ZHANG Li1, NIU An-fu2, TANG Shu-en2, WANG Yong′an1   

  1. 1. Earthquake Administration of Yunnan Province, Kunming 650041;
    2. China Seismic NetworksCenter, Beijing 100036;
    3. Bureau for Precaution against earthquake Disaster of Kunming City, Kunming 650011, China
  • Received:2004-06-14 Revised:2004-08-01 Online:2005-04-30 Published:2021-11-10

PDF (PC)

摘要： 总结了2003年大姚6.2级地震云南模拟与数字化形变变化的短期异常特征。 由模拟形变观测资料显示倾斜单分向加速变化显著,震前均出现转折变化; 地应力阶变及大幅度波动为震前异常形态,而重力没有异常出现。 异常展布距震中97~346 km, 异常台站比(距震中400 km范围)为35.7%。 数字化形变的9个测项中, 楚雄倾斜和应变最为显著, 尽管与降雨影响有关, 但仍认为具有短期前兆意义。

关键词: 大姚地震, 连续形变, 模拟和数字化, 短期前兆

Abstract: This paper summarized the short-term anomalous characteristics of simulated and numeralized deformation before the Dayao MS6.2 earthquake, 2003 in Yunnan Province. Simulated deformation tilt one-way data demonstrated the obvious expediting change and turning change; crustal stress demonstrates step change and big amplitude motion change before the earthquake; gravity has not shown anomaly. Anomalous distribution is 97 km to 346 km from the epicenter. The anomalous station ratio (within distance of 400 km from the epicenter) is 35.7%. Among 9 observation items of numeralized deformation, tilt and crustal stress at Chuxiong station show outstanding change, though it is impacted by rainfall, it still has short-term precursory significance.

Key words: Dayao earthquake, Successive deformation, Simulating and Numeralization, Short-term precursor

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