摘要
利用交错网格有限差分方法对昆仑山断裂带人工爆破产生的围陷波进行了三维数值模拟解释.为提高断裂带最终模型的可信度,在围陷波模拟的同时考虑了人工爆破记录的三个分量.对昆仑山断裂带围陷波的模拟结果表明,影响围陷波特性的断裂带深度主要在1.0km以内.S波速度和断裂带宽度对围陷波的到时、频率、振幅和相位影响较大.数值模拟解释获得的昆仑山断裂带的细结构参数是:浅部断裂带宽度为300m,深部为250m;深度在400m以上断裂带内S波速度为0.98km/s,外部围岩S波速度为1.70km/s,Q值为13.8;S波速度和Q值随着深度的增加而增加;1000m以下断裂带内S波速度为2.80km/s,围岩S波速度为3.3km/s.
In this paper, we simulated the trapped waves generated by explosions in the Kunlun fault zone, using the three-dimensional staggered-grid finite difference algorithm. In order to improve the reliability of final fault-zone model, we use the data of three components. The simulations indicate that the region above the depth of 1.0 km in the Kunlun fault zone produces main effects on the characteristics of the trapped waves. The S- wave velocities and width of the fault zone have more effects on the arrival times, waveforms, amplitudes and phases of the trapped waves. By simulation, the detailed structure parameters of the Kunlun fault zone are as follows： the width of shallow fault zone is 300 m,and 250 m in deep; The S-wave velocity inside the fault zone is 0.98 km/s in the layers above 400 m in depth, and that of surrounding rock is 1.70 km/s, and the Q value is 13.8. The S-wave velocities and Q increase with depth. Beneath the depth of 1000 m, the S-wave velocity inside the fault zone is 2.80 km/s and that of surrounding rocks is 3.3 km/s.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第3期760-769,共10页
Chinese Journal of Geophysics
基金
国家自然科学基金项目(40474019)资助
关键词
昆仑山断裂带
断层围陷波
有限差分
数值模拟
人工爆破
Kunlun fauh zone, Fault-zone trapped waves, Finite difference, Numerical simulation, Explosion
