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《Earthquake Research in China》 2015-02
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Spectral characteristics of 2014 Yutian M_S7.3 earthquake sequence and its application in foreshock discrimination

Zheng Jianchang;Wang Peng;Xu Chongtao;Xu Fangfang;Earthquake Administration of Shandong Province;Wulian Seismic Station;Rongcheng Seismic Station;  
Based on waveform records from the Xinjiang Regional Seismic Network,the paper analyses the spectral characteristics of foreshocks and aftershocks of February 12,2014 Yutian MS7. 3 earthquake sequence. We use genetic algorithm to invert source spectrum of 103 ML≥3. 0events of the sequence. The results show that:( 1) corner frequency of foreshocks is relatively lower than that of aftershocks;( 2) using the nearest station's( YUT) data,we find that the observed spectrums of foreshocks are relatively independent of each other, the correlation coefficients of foreshocks and that of foreshocks to mainshock are on the low side;( 3) the variation of correlation coefficients of observed spectrums implies dynamic rupture process of the earthquake sequence and most of the events with low correlation coefficients occurred on branch faults,which deviate from the main rupture area;( 4) anomalously high frequencies of seismic radiation from foreshock sources are detected,which are probably due to an anomalous rigidity of the seismogenic medium. These features may be usable in foreshock discrimination.
【Fund】: 中国地震局“地震科技星火计划”(XH15026);; 山东省科技发展计划项目(2014GSF120007);; 中国地震局年度震情跟踪定向工作任务(2015020105)联合资助
【CateGory Index】: P315.7
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