远场地震电磁辐射强度与孕震震级关系  

Relationship between the Radiation Intensity of Far-field Seismic Electromagnetic and Pregnant Earthquake Magnitude

作　　者：范小平[1] 杨从杰[2] 李清河[2] 田韬[2] 

机构地区：[1]中国地震局地球物理研究所,北京10008 [2]江苏省地震局,江苏南京210014

出　　处：《西北地震学报》2008年第3期208-213,共6页Northwestern Seismological Journal

基　　金：地震科学联合基金(606044);江苏省社会发展基金(BS2005068)

摘　　要：基于垂直电偶极子激发源模型,首先研究了远场地震电磁场辐射场及其分布特征,其次分析了远场地震电磁辐射强度与孕震震级之间的关系。结果表明垂直电偶极子激发源可以解释孕震区激发电磁辐射现象,是激发地震电磁辐射最有可能的激发源之一;远场地震电磁辐射强度的对数与地震震级呈线性关系,直线的斜率与孕震区裂隙特性分布及其电磁特性有关。研究结果对进一步认识地震电磁辐射现象和拓宽地震监测预报思路均有积极意义。Based on the vertical electric dipolar emitter source model, the far-field characteristics of seismic electromagnetic radiation are studied first, and then the relationship between the radiation intensity of far-field seismic electromagnetic and pregnant earthquake magnitude is analyzed. The results show that the vertical electric dipolar emitter source model can be used to interpret the phenomenon of electromagnetic radiation emitting in seismogcnie zone, and is one of the most possible source mechanisms for emitting the seismic electromagnetic radiation field. The logarithm of radiation intensity of far-field seismic electromagnetic has linear relation to earthquake magnitude, and the lineg slop has relation with the fracture distribution and fracture electromagnetic characters in seismogenie zone. The results of this paper are significant for knowing the phenomenon of seismic electromagnetic radiation and useful for earthquake prediction.

关 键 词：地震电磁辐射 震电转换机制 震级 垂直电偶极子激发源 

分 类 号：P315.72[天文地球—地震学]