| 昆仑山断裂带围陷波的有限差分数值模拟解释 |
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| 引用本文： | 姚志祥,王椿镛,裴正林.昆仑山断裂带围陷波的有限差分数值模拟解释[J].地球物理学报,2007,50(3):760-769. |
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| 作者姓名： | 姚志祥 王椿镛 裴正林 |
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| 作者单位： | 1.中国地震局地球物理研究所，北京100081 2 石油大学中国石油天然气集团公司物探重点实验室，北京100083 |
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| 基金项目： | 国家自然科学基金项目(40474019)资助 |
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| 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10 km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300 m，深部为250 m；深度在400 m以上断裂带内S波速度为098 km/s，外部围岩S波速度为170 km/s，Q值为138；S波速度和Q值随着深度的增加而增加；1000 m以下断裂带内S波速度为280 km/s，围岩S波速度为33 km/s.
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| 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 |
| 文章编号： | 0001-5733（2007）03-0760-10 |
| 收稿时间： | 2006-2-22 |
| 修稿时间： | 2006-02-22 |
Finite difference numerical simulation of trapped waves in the Kunlun fault zone |
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| YAO Zhi-Xiang,WANG Chun-Yong,PEI Zheng-Lin.Finite difference numerical simulation of trapped waves in the Kunlun fault zone[J].Chinese Journal of Geophysics,2007,50(3):760-769. |
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| Authors: | YAO Zhi-Xiang WANG Chun-Yong PEI Zheng-Lin |
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| Institution: | 1.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China 2 Key Laboratory of Geophysical Exploration of CNPC in the University of Petroleum, Beijing 100083, China |
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| Abstract: | 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. |
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| Keywords: | Kunlun fault zone Fault-zone trapped waves Finite difference Numerical simulation Explosion |
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