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《Earthquake》 1990-03
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POWER SPECTRUM ANOMALY OF EARTHRESISTIVITY IMMEDIATELY BEFORE TANGSHAN EARTH-QUAKE M7.8

Qian Fuye Zhang Yulin Liu Jie Huang Yanni(Institute of Geophysics, SSB)  
The power spectrum analysis of data observed at Changli earthresistivity station during 1973-1978 was carried out and found that the earthresistivity of this station successively occurred amplitude and frequency anomalies of semidiurnal period two months around the Tangshan strong earthquake M 7.8 on July 28, 1976, especially half a month immediately before the earthquake, its amplitude value exceed the observed error in normal times 5-20 folds and the monthly frequency anomaly of impulse immediately before the earthquake was 3-4 times higher than the usual background value. Analysis shows that the appearance of such semidiurnal power spectrum anomaly of earthresistivity is the concrete expression of the reduction and tendency to zero of the curve gradient of the eigen relation of the geologic body in the vicinity of the epicentre. So, the power spectrum anomaly of semidiurnal period of earthresistivity is the electricity mark in the impending stage of large earthquakes.
【Fund】: 地震科学联合基金
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