论文部分内容阅读
根据技新的深地震反射资料、构造应力场和震源机制等资料，建立了1966年邢台7.2缓地震孕震区的平面和剖面的有限元模型。对平面和剖面模型在EW向水平外压力下的最大剪应力分布进行了计算，剪应力相对集中的部位和大震震源位置比较一致。提出了邢台7.2级地震的动力学模型，认为地震的孕育和发生可能需要深、浅部断层、壳内低速层和EW向水平压力的共同作用。虽然由震源机制和地震宏观烈度分布等资料可指出有具体的发震断层存在，但地震的发生，更重要的应该是有各种构造和周围介质以最有利于应力集中方式的相互配合。
According to the new data of deep seismic reflection, tectonic stress field and focal mechanism, the finite element model of plane and section of the seismogenic zone of 7.2 slowly earth-shaking in Xingtai of 1966 was established. The maximum shear stress distribution of plane and cross-section models under horizontal external pressure of EW is calculated. The site of relative concentrated shear stress is consistent with the focal position of large earthquakes. The dynamic model of the 7.2 magnitude earthquake in Xingtai is proposed. It is suggested that the occurrence and occurrence of earthquakes may require the interaction of deep and shallow faults, low velocity inside the shell and horizontal pressure of EW. Although it is possible to point out the existence of a specific seismogenic fault by the source mechanism and the distribution of the macro-seismic intensity, it is more important that the occurrence of earthquakes and the interaction between various structures and the surrounding medium should be most conducive to stress concentration.