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从密云变质岩的矿物组合和变质相律中,本文揭示出多震层的某些主要特征。在地壳10—25公里深处的不同物性、成分的岩石,彼此具有不同程度的形变。差异形变的机理是按应变椭球体的形成过程来解释的。其中,不同岩石相对的流劈理和破劈理是在同一受力系统下发育形成。当达到差异形变的极限状态时,破劈理可导致产生压剪逆掩断层,激发强震,故差异形变力即是激发强震的驱动力。本文并对缓慢形变和快速发震、震源体构造和岩石作了某些初步探讨。
From the mineral assemblages and metamorphic phases of the Miyun metamorphic rocks, some major features of the multi-seismic layer are revealed. Rocks of different physical properties and composition at a depth of 10-25 km in the crust have different degrees of deformation from each other. The mechanism of the differential deformation is explained by the formation of the strain ellipsoid. Among them, the relative flow cleavage and fracture cleavage of different rocks are formed under the same stress system. When reaching the ultimate state of differential deformation, broken cleavage can lead to the formation of pressure-shear thrust and strong earthquake, so the differential deformation force is the driving force for strong earthquake. In this paper, some preliminary studies on slow deformation and rapid seismogenic, focal body structure and rock are made.