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《Seismology and Geology》 2009-03
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APPLICATION OF WAVELET MULTI-SCALE ENTROPY TO CROSS-FAULT DEFORMATION DATA IN XINJIANG

LIU Guan-zhong1) WANG Jian-jun1) WANG Zai-hua2)JIANG Jing-xiang2) XIE Zhou-min1) TAN Qiao1)1)Institute of Crustal Dynamics,China Earthquake Administration,Beijing 100085,China 2)Earthquake Administration of Xinjiang Uygur Autonomous Region,Urumqi 830011,China  
Information extraction and analysis about cross-fault deformation is one of the important contents in earthquake research. Based on the theory of wavelet analysis and information entropy,the wavelet multi-scale entropy that describes the ordering degree in local data has been proposed in this paper. We studied the wavelet multi-scale entropy variation characteristics before strong earthquakes and the relationship between decreasing entropy anomaly and the three elements of earthquake by using the cross-fault fixed deformation data from Tianshan area in Xinjiang. The results indicate that:the amount of information of high frequency component is more than that of low frequency in cross-fault deformation rate,and a decreasing entropy anomaly appears before most of strong earthquakes. Furthermore,the logarithm of cumulative decreasing entropy is obviously linear with magnitude and the time from the beginning of anomaly to the occurrence of earthquake. If the magnitude is larger,the time from the beginning of anomaly to earthquake will be longer,and the cumulative decreasing entropy will be larger. Finally,the association is obvious between the integral decreasing entropy of multiple stations and large range crustal movement and the seismic active period.
【Fund】: 中国地震局地壳应力研究所基本科研业务专项“基于新疆地形变观测多源信息融合的地壳形变场演化研究”(ZDJ200810)资助
【CateGory Index】: P315.2
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