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Preliminary study on characteristics of earthquake precursor of earth resistivity anisotropy degree in East China
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作者 FENG Zhi-sheng(冯志生) +9 位作者 YANG Jian-jun(杨建军) MEI Wei-ping(梅卫萍) GENG Jie(耿杰) WANG Xue-quan(汪雪泉) LIU Yi-gao(刘义高) 《Acta Seismologica Sinica(English Edition)》 CSCD 2004年第2期244-250,共7页
Introduction  The degree of earth-resistivity anisotropy was described (MAO, et al, 1995, 1998) as follows:  S=|1\nn∑I=1(ρSN\ρEW)I|-1|×103 n=6(1)  whereρNS and ρEW are monthly mean values of earth resi... Introduction  The degree of earth-resistivity anisotropy was described (MAO, et al, 1995, 1998) as follows:  S=|1\nn∑I=1(ρSN\ρEW)I|-1|×103 n=6(1)  whereρNS and ρEW are monthly mean values of earth resistivity in the direction of NS and EW, respectively, S is the half-year value. Equation (1) shows that if ρNS=ρEW, then S =0 and the electrical property of medium is isotropic; if ρNS≠ρEW, then S≠0 and the electrical property of medium is anisotropic. When S increases, the anisotropy of electrical property of medium is enhanced. Because the rightside of equation (1) is absolute value and the possibility ofρNS>ρEW and ρNS<ρEW can be different at different stations, the increase or decrease of S cannot reflect the relative changes between ρNS and ρEW. FENG, et al (2000) defined S as follows:…… 展开更多
关键词 degree of earth-resistivity anisotropy seismic anomaly Fourier fitting travel time curve
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