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本区地震往往发生在10～20千米深处,若将震源上复岩层重力负荷在地壳深部产生的垂直应力及水平应力视为背景应力,而将重力导致的青藏高原壳内水平应力视为叠加于背景应力之上的附加构造应力。可以证明,在这一情况下,地壳深部具备产生平移错动型断层的基本力学条件,实际资料也表明,本区地震断层以平移错动为主。现今国内外的研究者仅讨论过断层倾滑错动的重力机制问题。本文提出了断层平穆错动与重力关系的新见解,这对正确认识重力在构造与地震活动中的作用将是有益的。
The earthquakes in this area often occur at depths of 10 to 20 km. If the vertical stress and horizontal stress generated by the gravitational load of the upper and lower strata in the crust are regarded as the background stress, the horizontal stress in the crust caused by gravity is considered as Additional tectonic stress superimposed on background stress. It can be proved that in this case, the basic mechanical conditions that produce translational and fault-moving faults are present in the deep crust. The actual data also show that the seismic faults in this area are dominated by translational faults. Nowadays, researchers at home and abroad only discuss the gravitational mechanism of fault dumping fault. This paper presents new insights into the relationship between fault dislocation and gravitational force, which is beneficial for a correct understanding of the role of gravity in tectonics and seismicity.