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本文通过震源简化模型的分析表明,震源的环境刚度(包括轴向、侧向和错动带端部刚度)是影响发震的重要因素。除强度条件外,环境刚度条件是发震的另一必要条件。在考虑环境刚度效应的情况下,震源平均应力降的数量级有可能小于10~2甚至10~1 MPa,在较高围压下产生较低的应力降。文中还讨论了区分两类闭锁部的必要性,指出错动带上的闭锁部有的是潜在的“震核”,有的则作为“端部”,阻碍发震;液体渗入震源体的不同部位可能引起两种相反的作用,诱发或抑制强震的发生。同时还讨论了环境刚度的几何参数和烈度分布之间的关系。
The analysis of the source simplified model shows that the environmental stiffness of the source, including the axial stiffness of the lateral and lateral zones, is an important factor that affects the seismicity. In addition to the strength conditions, the environmental stiffness condition is another necessary condition for the earthquake. Considering the effect of environmental stiffness, the magnitude of the average stress drop of the source may be less than 10 ~ 2 or even 10 ~ 1 MPa, resulting in lower stress drop at higher confining pressure. The paper also discusses the necessity of distinguishing between two kinds of locking parts. It points out that some of the locking parts on the shifting belt are potential “nuclei”, while others are “end parts”, which impede the occurrence of seismogenic events. The infiltration of liquids into different parts of the source body may Caused two opposite effects, inducing or inhibiting the occurrence of strong earthquakes. The relationship between the geometric parameters of environmental stiffness and the intensity distribution is also discussed.