全球板块运动对板块边界带应力场的影响

Global Plate Motions and the Influence on the Stress Fields near the Plate Boundary Segments

将全球板块边界带分别按照不同的宽度加以界定 ,计算了全球板块边界应力场的长、短波分量 ,讨论了应力场短波分量对观测应力场的相对贡献 ,分析了其与板块边界相互运动类型的相关性 .在收敛型边界带 ,俯冲板片推 (拉 )力是驱动板块运动的主要力源 ,仅仅洋脊推力不能主导板块的应力场形态 ;同时 ,大陆板块之间的碰撞力对板块运动具有重要意义 .计算结果还显示板块边界带参考半宽度以不大于 2 0 0km较为合适 .

In this paper we determine the global plate boundary segments with different width and calculate the long-wave and the short-wave components of the stress fields.We thus discuss the relative contribution of the short-wave components to the stress field and analyze the relationship between contributions and the relative motions of the plate boundaries. The main plate driven forces come from the slab pull (or slab suction) on the convergent boundaries, and the ridge push forces cannot be the only control forces on the stress style of plates. The collision forces between two continental plate boundaries play an important role in their motions.Our study shows that the reasonable reference half-width of boundary is less than 200 km.