二维应变速率正演模拟

2-D strain rate forward modeling

由给定的随时间和空间变化的二维应变速率分布计算速度场,根据速度场计算二维热传导方程,得到岩石圈的热演化结构,然后计算由热扰动引起的密度变化,进而确定加载到岩石圈上的载荷,根据载荷计算挠曲方程,最终得到盆地的沉降.在此基础上讨论了热源对地表热流和沉降的影响以及岩石圈有效弹性厚度对盆地几何形态的影响.结果表明,热源对地表热流影响显著,对沉降影响不大,岩石圈有效弹性厚度则控制盆地的几何形态.二维应变速率正演为下一步的反演奠定了基础.

Given the variation of two-dimensional strain rate through space and field is calculated. This velocity field determines the evolving thermal time, the structure velocity of the lithosphere. The temperature structure constrains the changing density structure which defines the loading history. Finally, subsidence history is calculated by solving the flexural equation with the imposing loads. Based on the forward modeling, we analyze the effects of heat source on surface heat flow a the geometry of ri surface heat flow b controls the geome nd subsidence and study how the lithospheric effecti fted basins. The results indicate that heat source ut has little impact on subsidence. The lithospheric try of rifted basins. The forward modeling provides ve elastic thickness affects has significant effect on effective elastic thickness a good foundation for the inversion of 2D strain rate.