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《Chinese Journal of Geophysics》 2005-01
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Application of method of spectral component ratio of wavelet-packets to discrimination between earthquakes and nuclear explosions

YANG Xuan-Hui 1, SHEN Ping 2, LIU Xi-Qiang 3 , ZHENG Zhi-Zhen 4 1 Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China 2 Institute of Geophysics, China Earthquake Administration, Beijing 100081, China 3 Shandong Provincial Earthquake Administration, Jinan 250014, China 4 The Center of Seismic Data and Information, China Earthquake Administration, Beijing 100045, China  
The spectral analysis method is widely used in discrimination between nuclear explosions and earthquakes. As a stationary method, it has low resolution due to its invariable time_frequency window, even if the Gabor transform is adopted. To improve its resolution, a wavelet transform is applied to the analysis of earthquakes and nuclear explosions, which were recorded at the rümqi seismic station in the Xinjiang Autonomous region. And a criterion of spectral component ratio of wavelet_packets (SCRWP), which is used to identify the earthquakes and nuclear explosions, is proposed. Analysis of data of the India nuclear test recorded by the Yellow Knife Seismic Array in Canada has also confirmed that the SCRWP method is rather effective in discrimination between nuclear explosions and earthquakes. The result shows that the SCRWP value U\+0\-3/U\+1\-3 is generally higher than 1 0 for earthquakes, but usually less than 1 0 for nuclear explosions.
【Fund】: 国家自然科学基金项目 (4 9744 0 0 6)资助
【CateGory Index】: P315
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