地球内不同类型应力源引起的地球变形

EARTH DEFORMATION CAUSED BY DIFFERENT STRESS SOURCES ACTION WITHIN EARTH

本文研究了地球在内部位势场源和管量场源作用下引起的球形地球变形。着重研究了大地水准面高的变化与正高变化的比直,导出了它在球坐标系中的理论和数廬计算公式。数值结果表明:地球在位势力源和管量力源作用下所引起的大地水准面高的变化与正高变化,其比值的球函数系数低阶项相差近一个量级。因此,用大地水准面高的变化与正高变化的比值这一指标来研究现代地壳运动及重力场随时间变化等地球动力学问题将是十分有用的。

Earth deformation produced by potential source and curl source is investigated in this paper. The ratio β of variation of the geoidal height to the normal height is emphatically studied, and its theoretical and numerical formulas in spherical polar coordinates 8re derived. Computed results show the coefficients of spherical series of β produced by potential source are much smaller than one produced by curl source, and thus it is very useful that the geodynamic reasons of recent crust movements and gravity variations in time are studied by index β.