电阻率多极距观测台站的电性结构模型及参数反演研究——以山丹台为例  

Studies on Electrical Structure Model and Parameter Inversion of Multi-separation Array Observation Station for Geoelectrical Resistivity——Taking Shandan Station as an Example

作　　者：朱涛[1] 王兰炜[2] 胡哲[2] 刘大鹏[2] 

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]中国地震局地壳应力研究所,北京100085

出　　处：《工程地球物理学报》2011年第1期16-23,共8页Chinese Journal of Engineering Geophysics

基　　金：新型地震前兆观测方法及传感器技术研究项目(编号:200808030)资助

摘　　要：电阻率多极距观测系统相对于目前地震监测中普遍使用的单极距观测系统是一个进步。利用电阻率多极距观测数据,经正、反演计算后可获得不同深度层的等效(真)电阻率值,可有效地排除因人类活动等引起的表浅层干扰,从而获得可靠性高的电阻率异常。不过,在获得等效(真)电阻率之前,须获得台站的电性结构模型,而前人未对此进行详细研究。因此本文以甘肃省山丹地震台为例,利用电阻率层析成像结果和电阻率多极距观测数据,详细研究了如何获得台站的初始电性结构模型及最佳电性结构模型,期望能为今后电阻率多极距观测数据的处理提供有益的帮助。Multi-separation array observation system is superior to the single separation array observation geoelectrical resistivity observation which is widely used in the present earthquake monitoring.The effective or true resistivity of different underground layers may be obtained via forward and inverse computations using the apparent resistivity from multi-separation array observation,which can be helpful to remove the disturbance originated from human activities and obtain the more reliable anomalies of resistivity in the end.However,before we obtain effective or true resistivity,we must obtain the electrical structure model of a station,which was not studied previously in detail.In the present paper,taking Shandan station as an example,we made detailed studies on how to obtain its initial and best-fit electrical structure model using electrical resistivity tomography and the resistivity from multi-separation array observation.We expect that it would be helpful to process these data in the future.

关 键 词：地电阻率 多极距观测 单极距观测 电性结构 正演 反演 

分 类 号：P631.325[天文地球—地质矿产勘探]