试论引起地壳水平构造应力变化的主因

ON THE PRINCIPAL REASON CAUSING THE CHANGE OF HORIZONTAL TECTONIC STRESS OF EARTH CRUST

本文通过论证说明引起地壳水平构造应力变化的主因是地壳法向应力分量的变化。地球自转角速度变化引起离心惯性力变化,而离心惯性力法向应力分量变化引起的地壳水平应力远远大于离心惯性力水平应力分量变化所导致的地壳水平应力。李四光在研究地壳水平应力时,将离心惯性力法向应力分量忽略不计是不合理的。

Through demonstration of the principal reason causing the change of horizontal tectonic stress of earth crustis the change of normal component of tectonic stress. The centrifugal inertial force is caused by the change of angular velocity of earth rotation, and the horizontal stress of earth crust caused by the change of normal stress component is much larger than that caused by the change of horiZontal stress component of centrifugal inertial fofr. eIt is unreasonable that the normal stress component of centrifugal inertial force is neglected by Li Siguang in studying horizontal strcss of earth crust.