电阻率各向异性及在地震研究中的应用  

Resistivity anisotropy and its applications to earthquake research

作　　者：朱涛[1] 周建国[1] 郝锦绮[1] 

机构地区：[1]中国地震局地球物理研究所,北京100081

出　　处：《地球物理学进展》2009年第3期871-878,共8页Progress in Geophysics

基　　金：中国地震局地球物理研究所中央级公益性科研院所基本科研业务专项(DQJB07B09)资助.

摘　　要：地电阻率各向异性广泛存在地壳中,尤其是浅部,因地震、矿山开采、火山喷发以及大型地质构造运动会明显改变地应力场,从而导致裂隙优势排列及裂隙中充填的流体重新分布,最终导致明显的电FA率各向异性.通过监测其变化,不仅可研究和了解地应力场的动态演化过程,还可以作为预测地震、矿震、火山活动和灾害性地质构造运动的依据,并研究它们形成的物理过程和物理机制.本文从室内、野外实验和数值模拟方面对电阻率各向异性的研究进行了概述,阐述了其在地震监测预报研究中的应用.探讨了室内电阻率各向异性岩石实验研究的发展特点,提出了新手段——电成像技术实验研究岩石电阻率各向异性的思路,期望建立研究电阻率各向异性的阵列式观测系统。The anisotropy of earth resistivity has been found widely in the crust, especially in shallow surface. Because the great changes of ground stress field due to earthquake preparation and occurrence, quarry production, volcanic eruption and large geologic tectonic motions will result in the predominant arrangement of cracks and the redistribution of the fluid filled in these cracks, subsequently the clear changes of resistivity and its anisotropy, to monitor their changes can not only be used to investigate and understand the dynamic ground stress field, but also be taken as the references for predicting earthquake, mining-induced earthquake, volcanic activity and disastrous geologic tectonic motions, and be used to study their physical processes and mechanisms. In the present paper, the progresses in the researches on resistivity anisotropy are summarized about experiments in lab and field as well as numerical modeling, and then its applications to the researches on earthquake monitoring and prediction are presented. At last, the developing characteristics of the experiments on resistivity anisotropy of rock samples in lab are discussed, and the idea of using a new way resistivity tomography to experimentally study the resistivity anisotropy of rock samples is put forward. It is expected to set up an observational system used electrode array to investigate resistivity anisotropy.

关 键 词：电阻率 电阻率各向异性 电成像技术 地震研究 岩石实验 

分 类 号：P315[天文地球—地震学] P319[天文地球—固体地球物理学]