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《EARTHQUAKE》 1997-03
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WAVELET-BASED ANALYSIS OF DYNAMIC SEISMICITY PERIOD

Du Xingxin(Seismological Bureau of Shanxi Province, Xi'an 710068, China)  
The Morlet wavelet translation method has been used to analyse the dynamic Period ofseismicity in North China, China,s continent and Shanxi province. The results show thatthere exist both comparatively stable periods and some varinble periods with time. For ex-ample, in recent 500 years, some quite stable periods, 300 years or 60 years, exist inNorth China; in recent 20 years, 2 to 3 years' stable period in Shanxi; and for earthquakeswith M 5 in china's continent, there commonly exist 30 year's period from 191O to 1980,but 20 or so years' period after 1980. The period change with time of seismic activity showedby wavelet analysis indicates that one should not only use the recent period and more stableperiod to predict seismic tendency, but also pay attention to the influence of the non-pre-dictable sudden change of period on predictive effects.
【CateGory Index】: P315
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