地壳中的应力场及一些诱震因素

STRESS FIELD IN THE EARTH'S CRUST AND SOME TRIGGERING FACTORS FOR EARTHQUAKES

把地球考虑为在径向上由ｎ层具有不同物理—力学性质的物质所组成的球体，由此出发，推导了计算地壳中由地球自重、匀速自转、天体引力、地球自转速度变化所产生的位移场和应力场的公式。对由地壳和地幔以下物质所组成的二层体情形进行了详细推演，数值计算表明：作为诱震因素。

Considering the earth be a sphere consisting of n layers with different physic-mechanic properties in the radial direction,some formulas for calculating the displacement and stress fields in the earth's crust due to the dead weight and the rotation of the earth are presented in this paper,and added to this,the additional displacement and stress fields caused by the celestial attraction, the change in the rate of rotation of the earth are also investigated.As an example, the case in which the earth is assumed to be a sphere consisting of two layers is analyzed concretely.The numerical calculation shows that as the triggering factor for earthquakes, the celestial attractions,especially the moon's attraction to the earth,seem to play a rather important role than the change in the rate of rotation of the earth.