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作者通过对地质构造、地应力和地形变观测资料及震源机制解等的综合分析认为,无论在地质历史时期还是近代,地块受力方式、方向是有变化的。在没有其他因素的干扰和影响下,北半球至少是在中低纬度地区,在一次构造运动期间,主压应力方向是按南北→北东→北西→东西向有规律变化的,与地球自转的匀速、加速和减速的变化是同步的。侏罗纪以来,由于地球自转急速变慢,东西向挤压越发加强。由此可以认为,引起地块受力方向变化的原因可能与地球自转速率变化有关。
Based on the comprehensive analysis of geologic structure, geostress and topographic observation data and focal mechanism solutions, the authors believe that there is a change in the way and direction of stress on the block no matter in geological history or in modern times. Under the interference and influence of other factors, the Northern Hemisphere is at least in the middle and low latitudes. During a tectonic movement, the principal compressive stress direction changes regularly from north to north → northeast → northwest → east-west, , Changes in acceleration and deceleration are synchronized. Since Jurassic, due to the rapid slowdown of Earth’s rotation, the compression of east-west intensified. Therefore, it can be considered that the reason for the change of stress direction in the block may be related to the change of the Earth’s rotation rate.