安庆4.8级地震序列的地震波谱变化研究

采用安徽区域数字地震台网记录的安庆4.8级地震序列波形资料,开展地震波谱研究,求取了零频位移谱值、应力降和地震矩等震源参数。分析了纵、横波零频谱值比和应力降随时间的变化趋势,并讨论了震源参数之间的关系。结果表明,安庆4.8级主震后,纵、横波零频位移谱值比和应力降呈现一定的变化规律,可为主震—余震序列的最大余震的预测提供一定的参考依据,同时发现震源参数与震级有一定相关。

STUDY ON SEISMIC WAVE SPECTRUM OF ANQING M4.8 EARTHQUAKE SEQUENCE

The seismic spectrum is analyzed by using Anqing M4.8 earthquake sequence data recorded by Anhui Digital Seismic Network,the zero sequence of displacement spectrum,stress drop and seismic moment are calculated.The variation of the ratio value of zero sequence of displacement spectrum and stress drop with time are analyzed,and the relationship between focal parameters are discussed.The results show that the ratio value of zero sequence of displacement spectrum and stress drop varied regularly after Anqing M4.8 mainshock,which is the reference of the largest aftershock prediction of main aftershock sequence.Meanwhile,the focal parameters are correlated with magnitude.