WAVELET TRANSFORM OF ELETROMAGNETIC RADIATION BEFORE AND AFTER YUSHU Ms7.1 EARTHQUAKE
Zhang Jianguo 1,2) ; Liu Xiaocan 3) ; Ma Xinxin 3) ; and Jiao Liguo 3)
1)School of Earth and Space Science,University of Science Technology of China,Hefei 230026; 2)Central Seismostation of Handan,Handan 056001;3)Institute of Geophysics,CEA,Beijing 100081
Abstract：By use of the wavelet analysis, the electromagnetic radiation data of the Yushu earthquake magnitude 7.1 in Qinghai province near Dujiangyan, Jiange, Jiangyou stations in Sichuan and Ersha station in Zhengzhou before and after the event, were studied in the different scales of wavelet detail decomposition and then it is found that there are anomalous information before the earthquake, and had interpretated preliminarily. The results show that, the first, the details of the wavelet decomposition show abnormal electromagnetic wave signal of low frequency before the earthquake portion of the earlier time; epicenter close to the station, the information that appears anomay in high frequency band; a little far from the epicenter of the station, the anomay in low frequency band information. The second,along with the epicentral distance increases, the smaller the radiation energy, the anomalies appear later.
Zhang Jianguo,Liu Xiaocan ,Ma Xinxin et al. WAVELET TRANSFORM OF ELETROMAGNETIC RADIATION BEFORE AND AFTER YUSHU Ms7.1 EARTHQUAKE[J]. jgg, 2011, 31(6): 32-38.
