摘要
根据青藏高原的地质特征建立分析模型 ,采用 3维动态有限元方法 ,在计算仿真板块速度场的基础上 ,计算在青藏高原的隆升过程中该地区地壳岩石的等效应力和位移随时间的变化 ,计算仿真得到的速度场与 1998年GPS观测的速度场吻合良好 ;与过去一贯的假设相反 ,计算结果反映出地壳应力场不是静态的 ,而是此起彼伏 ,不断变化的 ,应力值最大且变化最剧烈的地区在克什米尔地区、鄂尔多斯地区和鲜水河 -小江断裂带 ,与地震多发区域吻合。
An analysing model based on the geological characteristics of Qinghai Tibet plateau has been established.By three dimension(3D) non linear dynamic finite element method(FEM), the equivalent stress fields,displacement fields and their evolution during its up lifting have been calculated.The calculated velocity fields match GPS observations published in 1998 very well.Being opposite to the conventional assumption,the calculated stress fields are varying with time, and this dynamic behavior coincides with the facts of earthquake record and the interaction between faults.The sites with higher stress or gradients stress coincidently lie in Kashmir,Eerduosi and Xianshuihe regions where the earthquakes occurred frequently in the past decades.
出处
《大地测量与地球动力学》
CSCD
2002年第2期75-81,共7页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金重点项目 (4 983 40 0 2 )资助
