瞬态谱在地震与核爆识别中的应用  

APPLICATION OF TRANSIENT SPECTRUM TODISCRIMINATION OF NUCLEAREXPLOSIONS ANDEARTHQUAKES

作　　者：沈萍[1] 郑治真[2] 

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]中国地震局地震数据信息中心,北京100045

出　　处：《地球物理学报》1999年第2期233-240,共8页Chinese Journal of Geophysics

基　　金：国家自然科学基金!49744006;中国地震局地球物理所论著!99AL1015

摘　　要：采用非稳态的ＷＤ理论，对５个哈萨克斯坦地下核爆及其邻近地区７个区域地震资料进行分析，研究了地下核爆和天然地震的瞬态谱特征、瞬时频率随时间的变化。结果表明，地下核爆的瞬态谱主要分布在高频：核爆的瞬态谱大多数集中于５-１０Ｈｚ；天然地震的瞬态谱散布在低频到高频的较大范围。核爆的瞬时频率在起始阶段（０＜ｔ＜０．７５ｓ）表现为线性，起始频率为负值；天然地震的瞬时频率以跳动形式迅速变化，起始频率正负交替。同时还对地震和核爆瞬态谱差异进行了初步解释。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.

关 键 词：瞬态谱 核爆 地震 震源深度 

分 类 号：P315.3[天文地球—地震学] P315.9[天文地球—固体地球物理学]