浙北及邻近地区应力场数值模拟与地震危险区预测

NUMERICAL SIMULATION OF STRAIN FIELD IN NORTH ZHIJIANG AND ITS ADJACENT AREA AND PREDICTION FOR SEISMIC HAZARD ZONE

根据构造地质学、地震地质学的考察和观测结果 ,结合构造单元、地震活动分区和研究区位置确定计算模型的范围 ,选定一个构造骨架 ,确定计算模型的边界形状和几何参数。然后参考地震震源机制解结果和新构造运动特征 ,选定模型边界条件 ;参考岩石力学实验结果 ,确定模型的物理参数。最后利用线弹性二维有限元程序计算了各节点位移、各单元应力应变及应变能增量。通过分析应力应变场和应变能增量划分出 2个地震危险区。

Based on the investigation results of tectonics and seismo geology, the calculation model area is determined through combining tectonic unit, seismicity subdivision and researched regional location, a structural tectonic is elected, the boundry configure and geometry parameter of calculation are determined. Then refering the focal mechanism resolution and neotectonic movement characteristics, the boundry conditions are elected, and refering resultes of the rock mechanic experiment, the physical parameters of the model are determined. Finally, the displacements of the different nodes, the stress and strain and the strain energy increment of different unit are calculation using 2D finite element program of linear elasticity. Two seismic hazard zones are given through analysis for stress and strain field and strain energy increment.