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《Chinese Journal of Geophysics》 2007-03
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Finite difference numerical simulation of trapped waves in the Kunlun fault zone

YAO Zhi-Xiang~1,WANG Chun-Yong~1,PEI Zheng-Lin~21 Institute of Geophysics, China Earthquake Administration, Beijing 100081, China2 Key Laboratory of Geophysical Exploration of CNPC in the University of Petroleum, Beijing 100083, China  
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.
【Fund】: 国家自然科学基金项目(40474019)资助
【CateGory Index】: P315
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