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本文着重从物质分异的角度讨论了板块俯冲带及大陆地壳内某些地震成因机制问题。认为由于构造的活动和地球自转速度不均匀,在深大断裂带附近的上地幔或玄武岩层顶部容易产生分异的底辟构造。这种构造上隆引起的垂直作用力可促使地面产生同步隆起和侧翼相对下降,地震的震源往往位于底辟构造的侧翼或顶部。一般由底辟构造形成的垂直作用力与水平向区域构造应力场叠加成为一种叠加震源应力场。
This paper focuses on the issue of material genesis of the subduction zone and some earthquakes in the continental crust. It is considered that the divergent diapir structure is likely to occur at the top of the upper mantle or basaltic layer near the deep fault zone due to the non-uniform velocity of constructed activity and the Earth’s rotation. The vertical force caused by this type of uplift can promote the simultaneous uplift of the ground and the relative decrease of the flanks. The seismic sources are often located on the flanks or the top of the diapir structure. Generally, the vertical force formed by the diapir structure and the horizontal tectonic stress field superposition form a superposition source stress field.