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《Chinese Journal of Geophysics》 1999-02
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APPLICATION OF TRANSIENT SPECTRUM TODISCRIMINATION OF NUCLEAREXPLOSIONS ANDEARTHQUAKES

SHEN PING (Institute of Geophysics, SSB, Beijing 100081, China)ZHENG ZHI-ZHEN(Center of Seismic Data and Information, SSB, Beijing 100045, China)  
Nonstationary theory of Winger Distribution is used to discrimination ofunderground nuclear explosions and natural earthquakes in this paper. Five undergroundexplosions in Kazakhstan and seven earthquakes in its adjacent area are analyzed. Theresults show that the transient spectra of underground nuclear explosions areconcentrated in high frequency, 5- 10Hz, while the transient spectra of naturalearthquakes are distributed widely, from lower frequency to higher frequency. Thetransient frequency of nuclear explosions shows a linearity in starting stage (0 t 0.75s) and its initial frequency is negative. The transient frequency of naturalearthquakes rapidly changes in the form of a jump and its initial frequency isalternative of positive and negative values, and then a preliminary explanation aboutdiscrepancy between underground unclear explosions and earthquakes is also given.
【Fund】: 国家自然科学基金!49744006;;中国地震局地球物理所论著!99AL1015
【CateGory Index】: P315
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