孕震过程中冲流电位地电异常的理论研究  

THEORETICAL RESEARCH ON GEOELECTRIC ANOMALY CAUSED BY STREAMING POTENTIAL DURING EARTHQUAKE PREPARATION

作　　者：朱涛[1] 赵和云[2] 

机构地区：[1]中国地震局地震数据信息中心,中国北京100045 [2]中国地震局兰州地震研究所,中国兰州730000

出　　处：《地震学报》2001年第4期398-406,共9页Acta Seismologica Sinica

基　　金：中国地震局兰州地震研究所论著 :LC2 0 0 1 0 3 4

摘　　要：分别计算了具有对称压力源分布的水平层状半空间介质模型和各向异性裂隙模型的地表冲流电位异常 .结果表明 ,本文所采用的模型计算出来的地表冲流电位异常最大值的量级是合理的 ,其幅度最大约为几百毫伏 ;异常范围随地下各向异性强烈程度而变化 .同时 ,在计算地表冲流电位异常时引入了各向异性裂隙的概念 ,从而从理论上解决了实际观测与理论不相符合的矛盾 .The surface streaming potential anomalies (SSPA) for a buried symmetrical pressure source in homogeneous and anisotropic layered half space are calculated separately in this paper. The results show that the maximum of SSPA calculated using the two models are reasonable and are about several hundred mV. The range in which SSPA can be detected on the earth′s surface varies with the intensity of medium anisotropy. Anisotropic crack is introduced to calculate the magnitude of SSPA, so theoretically the contradiction between observation data and theoretical results is interpreted more reasonably.

关 键 词：地震 冲流电位 地电异常 各向异性裂隙 孕震 对称压力源 

分 类 号：P315.4[天文地球—地震学]