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随着我国地震台网的不断增密,区域地震的研究正在迅速发展,所面对的资料是大量小地震。此外,在任何一个地震序列中,小地震的数量总比大地震多得多。因此研究小地震的机制非常必要。本文试图给出一个研究小地震机制的方法。此方法采用双力偶点源模型,通过三个变角来确定应力主轴的取向。为了求解三个变角,利用四个地震台初动振幅的相互比值建立了三个方程。此方法要求至少有四个地震台,而每个台只要有一个分向的良好记录即可。对地震仪的特性提出了要求,对地面影响和此方法的震级限度作了讨论。
As China’s seismic network continues to increase its density, the research on regional earthquakes is rapidly developing and the data it faces is a large number of small earthquakes. In addition, the number of small earthquakes in any one earthquake sequence is always much larger than that of a large earthquake. Therefore, it is necessary to study the mechanism of small earthquakes. This paper attempts to give a method to study the small earthquake mechanism. In this method, a dual-force dual-point source model is used to determine the orientation of the stress spindle through three variable angles. In order to solve the three variations, three equations are established by using the mutual ratio of initial amplitude of four seismometers. This method requires that there be at least four seismographs, and that each station has only one good record of direction. The requirements for seismograph properties are set forth, and the effects on the ground and the magnitudes of the magnitude of this method are discussed.