摘要
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。
The continuous increase of seismic stations in China has been accompanied by the rapid development of the study of regional earthquakes.The data of a series of minor earthquakes has been accumulated.On the other hand,in every sequence of earthquakes,the number of minor earthquakes has always been much more than that of greater earthquakes.Therefore,the study of the mechanism of minor earthquakes is quite neccessary.It is an intention in this paper to propose a method for studying the mechanism of minor earthquakes.The method adopts the double couple model and uses three variable angles to determine the orientation of the principal axes of stress.To solute the three variable angles,we use the mutual ratios of first motion amplitude of four stations to establish three independent equations.The method requires at least four stations and only one component good recording at every station.The characteristics of seismometer are required.The effects of ground surface and the limitation for magnitude are discussed.
出处
《地球物理学报》
1974年第3期155-164,共10页
Chinese Journal of Geophysics
