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《Earth Science Frontiers》 2003-S1
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ZHAO Guo-ze 1, TANG Ji 1, DENG Qian-hui 1, ZHAO Jun-meng 1, WANG Ji-jun 1, CHEN Xiao-bin 1, ZHAN Yan 1, XUAN Fei 1, A. K. SARAEV 2, M. I. PERTEL 2, A. B. KOTCHEROV 2, M. M. KHARLMOV 2, LU Yue 3, LIU Yun-xiu 4, ZHANG Jian-xin 4, ZHAI Yan-zhong 5 (1.Institute of Geology, China Seismological Bureau, Beijing 100029, China; 2.St. Petersburg State University, St. Petersburg, 199034, Russia; 3.Beijing Seismological Bureau, Beijing 100080, China; 4.Tianjin Seismological Bureau, Tianjin 300201, China; 5.Hebei Seismological Bureau, Shijiazhuang 050021, China)  
The technique of electromagnetic waves in SLF (Super Low Frequency) frequency band can be investigated in the light of geophysical theory combined with radio-physical theory. The artificial signals can be measured in a quite large area on the earth surface to investigate the space electromagnetic field and crust conductivity structure. It is a useful technique for monitoring electromagnetic anomaly caused by earthquake and for probing the subsurface resources. The experimental studies in Beijing and Tianjin showed that the power spectrum density of SLF signal is larger than those of natural electromagnetic signal by several times even in the industry noisy area. The apparent resistivity obtained by SLF method has much smaller error bar than that by natural signal and is less influenced by disturbances. An earthquake (M=4.2) occurred some 120 km away from the Baodi observation site during SLF measurements indicates that the earthquake development and the anomaly of electromagnetic field and apparent resistivity are well correspondent. It is postulated that the anomaly of electric and magnetic fields and apparent resistivity were caused by interaction between regional stress and local electromagnetic source.
【Fund】: 国家自然科学基金资助项目 (4 0 2 740 17)
【CateGory Index】: P631.325
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