活动断层高密度电法响应特征与应用研究  

Study on the response characteristics and application of high density resistivity method of active fault

作　　者：罗登贵[1,2] 刘江平[3] 王京[3] 程邈[1,2] 

机构地区：[1]中国地震局地震研究所地震预警湖北省重点实验室,武汉430071 [2]武汉地震工程研究院,武汉430071 [3]中国地质大学(武汉),武汉430074

出　　处：《地球物理学进展》2014年第4期1920-1925,共6页Progress in Geophysics

基　　金：湖北省"十一五"重点建设项目"湖北省地震背景场探测工程"资助

摘　　要：活动断层探测作为减轻地震灾害而开展的一项重要工作,一直被人们所关注.高密度电法已广泛应用于地质调查中,为了进一步认识高密度电法不同装置的探测效果及活动断层探测的高密度电法装置的有效选择,本文进行了温纳装置、二极装置、偶极—偶极装置、三极装置和温施装置的理论模型正反演研究,以及常用的温纳装置、温施装置和偶极—偶极装置的实例应用研究与分析.(1)基于断层是否穿过第四系判断断层活动的前提,理论模型模拟表明高密度各装置均可进行活动断层的定性探测和进行地质分层,而表层为相对高阻层的地层结构有利于进行地质分层,其精度高于表层为相对低阻层的地层结构;(2)模型模拟表明高密度偶极—偶极装置进行活动断层的定性探测和地质分层是最有效的装置,三极装置次之;(3)理论模拟和实例应用表明,高密度偶极—偶极装置对活动断层的响应最敏感,可有效确定其性质,这与理论模拟结果完全相符,因此实际应用时宜采用偶极—偶极装置进行活动断层的探测.As an important work for the reduction of earthquake disasters,active fault detection has been concerned by people all the time.High density resistivity method has been widely used in geological survey.In order to further understand the detection effect of high density resistivity method with different device and effectively select the devices of high density resistivity method for active fault detection,in this paper,we do some research on the forward modeling and inversion of theoretical model by use of wenner device,two-pole device,dipole-dipole device, three-pole device and wennerschlumberger device.Besides,we also present the practical application and analyses with wenner device, wennerschlumberger device and dipole-dipole device which are in common use.（1）Based on the premise that whether the fault pass through the quaternary to judge the fault activity,theoretical model simulation indicates that all the device can carry out the active fault qualitative detection and geologic stratification.In addition, Surface structure which is a relatively high resistance layer is more favorable for geologic stratification and has higher accuracy than a relatively low resistance surface structure;（2）Theoretical model simulation indicates that dipole-dipole device is the best device to active fault qualitative detection and geologic stratification,followed by three-pole device;（3）Theory simulation and application indicates that dipole-dipole device is the most sensitive to active fault’s response and effectively confirm the fault property which is consistent with the theoretical simulation results.Therefore,we should use the dipole-dipole device to detect active fault in the practical application.

关 键 词：活动断层 高密度电法 不同装置 正反演 实例应用 

分 类 号：P319[天文地球—固体地球物理学]