欢迎访问《地震》，
地震

地震 ›› 2002, Vol. 22 ›› Issue (4): 17-23.

• • 上一篇    下一篇

井孔ΔH指标及其观测系统原理

蔡作馨1, 蔡诗凰2, 史磷舜贩贩娄2, 王吉易3, 杨鼎鸿1   

  1. 1.福建省地震局宁德地震台, 福建宁德 352101;
    2.福建省地震局, 福建福州 350003;
    3.河北省地震局, 河北石家庄 050021
  • 收稿日期:2002-06-26 修回日期:2002-07-01 发布日期:2021-12-21
  • 作者简介:蔡作馨(1946-),男,福建宁德人,高级工程师,主要从事地震流体前兆研究。

WellΔH index and principle of its observation system

CAI Zuo-xin1, CAI Shi-huang2, SHI Lin-hua2, WANG Ji-yi3, YANG Ding-hong1   

  1. 1. Ningde Seismic Station, Seismological Bureau of Fujian Province, Ningde 352101, China;
    2. Seismological Bureau of Fujian Province, Fuzhou 350003, China;
    3. Seismological Bureau of Hebei Province, Shijiazhuang 050021, China
  • Received:2002-06-26 Revised:2002-07-01 Published:2021-12-21

PDF (PC)

摘要： 根据地震前兆的“应力-应变原理”, 以及“岩石变形破坏的实质是其孔隙度发生变化”的结论, 进一步应用地下水动力学中的达西定律推导得出, 饱和含水层井孔在恒定流量下的动水位与该井孔静水位之差或二种不同恒定流量下的动水位之差Δ H, 可以相对量度饱和含水层岩体孔隙度的变化, 进而得出相对量度岩体受力变形的动态变化过程, 这可作为一项新的地震前兆指标。据此设计了一种以“井孔Δ H指标”为观测对象的新型地震前兆观测系统。理论分析得出, ΔH 指标仅对地下深部岩体应力-应变的变化信息敏感, 对非应力-应变因素和地表干扰不敏感。已有实验初步验证了其具有抗干扰、高灵敏度和高信噪比等特性。距离实验点400 km的2002年3月31日台湾花莲海外7. 5级地震为ΔH 指标的可行性实验提供了一个例证。

关键词: 地震前兆, 水力传导率, 井孔Δ H 指标

Abstract: Basedon the theory of seismic precursor “stress-strain” relation and the fact when deformation and destroying of theterrain under force is the changing of its porosity, Δ H, which is the difference between welldy namic level and static level under the constant flowor the difference of dy namic level under two kinds of different constant flow, can relatively measure the changing of saturated aquiferterrain porosity when using the Darcy′s law of hydrology. Furthermore Δ H can be used torelatively measuredy namic changing process of terrain deformation under force, thus it can be used to be a kind of new type of seismic precursory indexes. Basedon the above-mentioned facts, a kind of newseismic precursory observation system, in which the indexis Δ H, isdesig ned. Basedon theoretical analysis, the indexΔ H is just sensitive to changing information of stress-strain indeep-seatedterrain while it is not sensitive to the factor which is not caused by stress-strain changing and the interfere of ground. It has been primarily verified by some experiments that Δ H has the feature of anti-interference, high sensitivity and high sig nal tonoiseratio. The MS 7. 5 of fshore earthquake, Hualian, Taiw an on May 31, 2002, which is 400km far from ourexperimental point, provides a case for the feasibility of indexΔ H.

Key words: Earthquake precursor, Hydraulic conductivity, Index of wellΔ, H

中图分类号: