摘要
用岩石层—地幔力学、热学耦合模型，以俯冲带为例，研究大陆岩石层不同的有效弹性厚度对岩石层形变和大地水准面起伏的动力影响。数值结果显示大陆岩石层有效弹性厚度的作用象一低通滤波器，它抑制岩石层形变和大地水准面起伏的高频分量。随着有效弹性厚度的增加，岩石层的形变和大地水准面起伏不仅幅度减小，其形状变化也被平滑。模拟结果表明，在进行大陆岩石层动力学过程的研究中，只有充分考虑大陆弹性岩石层有效弹性厚度的动力影响，才能更客观地描述研究客体。
The dynamic influence of various elastic thickness of continental lithosphere upon the lithospheric deformation and geoid undulation is investigated in the paper. A mechanical thermal coupling system of continental lithosphere and upper mantle is established. The numerical experiment is carried out by using the subduction zone as a sample. The numerical results suggest that the effective elastic thickness of the continental lithosphere acts as a low pass filter which suppresses the component of high frequency. The increment of the elastic thickness not only decreases the absolute value, but also smoothens the variation of the deformation and geoid undulation. In the study on continental dynamics, the object is described more objectively only after the influence of the elastic thickness of the continental lithosphere is taken into account.
出处
《地壳形变与地震》
CSCD
1998年第4期1-10,共10页
Crustal Deformation and Earthquake
基金
国家自然科学基金
国家攀登计划资助
关键词
大陆
岩石层
厚度
岩石层形变
大地水准面
动力
continental lithosphere, effective elastic thickness, lithospheric deformation, geoid undulation
