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地震

地震 ›› 2001, Vol. 21 ›› Issue (2): 79-86.

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大震前地下水位异常与应力异常区*

敬少群1,2, 王佳卫1   

  1. 1.长沙市地震局,湖南长沙 410012;
    2.中国科技大学空间科学系,安徽合肥 230026
  • 收稿日期:2000-08-07 修回日期:2000-10-08 出版日期:2001-04-30 发布日期:2022-10-27
  • 作者简介:敬少群,女,湖南桃源人工程师主要从事地下流体监测及预报研究。

Pre-earthquake anomaly of groundwater level and anomalous stress region

JIN Shao-qun1,2, WANG Jia-wei1   

  1. 1. Seismological Bureau of Changsha City, Changsha 410012, China;
    2. Department of Space Sciences, Univ ersity of Science and Technology of China, Hefei 230026, China
  • Received:2000-08-07 Revised:2000-10-08 Online:2001-04-30 Published:2022-10-27

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摘要： 利用井口水位对潮汐应力的响应,分析了含水层对强震孕育过程中应力变化的响应。结果显示,当含水层的瞬时应力变化值大于临界值时,水位的异常图像为阶变形态; 当含水层的瞬时应力变化值小于临界值,但某一时段的累计值大于临界值时,水位的异常图像为缓变形态。而水位异常图像出现的上升或下降形态,取决于井孔含水层系统在大震孕育过程的应力调整再积累阶段所处的构造部位。水位震前异常的特征,源于地震孕育过程中应力异常区的形成。

关键词: 井水位, 应力异常区, 异常机理

Abstract: Based on the response of well water level to tide st ress, the autho rs analyzed the response of well-aquifer to st ress v ariation during the process of earthquake preparation. While the instantaneous st ress variation of aquifer is more than the critical value, the chang epat tern of water level anomaly is leap. If the instantaneous st ress variation of aquifer is less than the critical value, but accumulation of stress variation of aquifer is more than the critical value in the course of time, water level anomaly is g entle. How ever, decline or rise of water level anomaly depends on the tectonic position where the well aquifer lies in the process of stress regulation and re-accumulation. Tha tis tosay, the feature of water level anomaly before strong earthquake is resulted f rom the regio n where stress anomaly was fo rmed during the process of earthquake preparation.

Key words: Well water level, Stress anomaly region, Anomalous mechanism

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