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引言本文为了探讨庙岛群岛两次小震群的不同特征,并讨论它们和唐山7.8级地震的关系,对两次小震群及其前后的部分地震记录图进行了波谱分析工作。借助郑治真等使用的方法求出振幅谱的拐角频率f_0、低频谱幅度值Ω_((0))及卓越频率f_ρ,并计算应力降△σ、地震矩M_0、震源尺度R;借助朱传镇等(2)的方法求出了介质的品质因子Q值。这两次小震群的震源参数表明,它们之间存在明显的差异,是类型不同的两种小震
INTRODUCTION In this paper, to investigate the different characteristics of two small swarm swarms in the Miaodao Islands and to discuss the relationship between them and the magnitude 7.8 Tangshan earthquake, the spectral analyzes of two small swarms and their parts before and after the seismogram were carried out. Calculate the stress drop △ σ, the seismic moment M_0 and the source scale R by using the method of Zheng Zhizhen and other methods to calculate the corner frequency f_0, the low frequency spectrum amplitude Ω_ ((0)) and the excellent frequency f_ρ of the amplitude spectrum; (2) method of calculating the quality factor Q value of the medium. The hypocenter parameters of these two small swarm swarms show that there are obvious differences between them and are two types of small earthquakes