含有限水体介质中地震波场数值模拟  

Numerical Simulation of Seismic Wave Field in medium with limited water

作　　者：孙楠[1,2] 孙耀充[1] 庾汕 SUN Nan;SUN Yaochong;YU Shan(School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,Auhui,China;Yunnan Earthquake Agency,Kunming 650224,Yunnan,China;Yunnan International Cultural Exchange Center,Kunming 650041,Yunnan,China)

机构地区：[1]中国科学技术大学地球和空间科学学院,安徽合肥230026 [2]云南省地震局,云南昆明650224 [3]云南国际文化交流中心,云南昆明650041

出　　处：《地震研究》2017年第4期557-564,共8页Journal of Seismological Research

基　　金：国家自然科学基金资助项目(41474048);震情跟踪定向工作任务项目(2017010501);云南省地震局青年基金项目(201602)联合资助

摘　　要：准确模拟地震波在复杂介质中的传播过程,能够为分析主动源探测中获得的数据资料以及反演区域内部介质结构提供理论支持和依据。基于二维介质模型,利用有限差分法对地震波场传播过程进行数值模拟。结果表明,震源在不同介质中被激发后所产生的波场特征不同,有限水体的存在对波场传播有显著影响,随着水体水位的加深,激发产生的波场能量先增强后减弱,存在一个最佳水位深度,此时激发产生的波场能量最强。在有限水体一侧激发震源时,两侧等震中距台站的记录会有所差异,靠近陆地的一侧的波场能量更大,传播速度更快,且水平分量的差异相比垂直方向更明显。因此,可以通过数值模拟判断水库水位的最佳深度与震源的最佳沉放位置,为水库激发气枪震源实验提供理论依据。Accurate simulation of seismic propagation through in complex medium could provide theoretical support and basis for analyzing the data obtained from the active source detection and inversion of regional interior medium structure Based on2D models,we use the Finite difference method to simulate the seismic wave field propagation The results show that the source stimulated in different medium could generate different wave characteristics,and the existence of limited water has a significant influence on the wave propagation The wave field energy strengthen following the level increasing of the limited water,until a water depth with the energy starts to weaken,while the water depth is the optimal depth with the maximum energy When source located on the side of the limited water,the records of stations in different sides with equal epicentral distance show obviously difference,and the wave from the land side has much more fast velocity and larger energy,and difference between the two sides is more obvious in horizontal component than that in vertical component Consequently,we can use numerical simulation method to estimate the optimal water level and source location,and on this account we can provide theoretical support for the experiment of the air gun source stimulated in reservoirs

关 键 词：有限差分法 地震波场 数值模拟 有限水体 震源位置 

分 类 号：P315.3[天文地球—地震学]