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《Earthquake》 1994-01
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APPLICATION OF VARIATION INDEX OF SEISMIC WAVE CHARACTERISTICS TO SHORT-TERM EARTHQUAKE PREDICTION

Feng Deyi Wu Guoyou Chen Huaran Guo Ruizhi(Seismological Bureau of Tianjin)Yu Xuejun(Seismlogical Bureau of Zhefang Province)Ding Weiguo (Seismological Bureau of Shanghai)  
The variations of dynamic characteristics, mainly the form and spectrum pf seismic waves before large earthquakes have been studied, and some prediction indices among which, some may be prospective in application to short-term(within half year) earthquake prediction, are found. These indices include: temporal and spatial linearity of wave form of initial part of S,P wave, its average half-period, the peak frequency, corner frequency, relative width of frequency domain, relative value of peak spectrum and the absolute slope value of high frequencies.At same time, it also analysed short-term(half year) and impending(9 days) precursory variations of linearity and spectral characeristics of short-term microseism waveform. And found precursory variations of linearity and spectral characteristics,average half-period,peak frequency,maximum frequency, corner frequency is obvious. Therefore, they may be considered as the indices for short-term and impending earthquake prediction.All the prediction indices of dynamic characteristics variation of seismic waves given in this paper are checked through Gonghe MS6.9 earthquake on April 26, 1990; Datong As6.1 earthquake on Oct. 19, 1989; Changshu MS5.1 earthquake on Feb 9, 1990 and some moderate earthquakes with MS4.5 occurred in recent years in Tangshan region,and partly through the Haicheng earthquake AS7.3 in 1975 and Tangshan earthquake MS7.8 in 1976.
【CateGory Index】: P315
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