震源初始破裂位置对地表地震动影响分析

发布时间：2018-03-22 10:35

本文选题：地震断层　切入点：初始破裂位置　出处：《振动与冲击》2015年24期 　论文类型：期刊论文

【摘要】：近断层地震动受地震震源参数的影响显著,基于典型的地震有限断层模型,通过离散波数有限元数值模拟方法,计算了断层上可能的三种不同初始破裂位置条件下的一系列地表场点的地震动时程,比较不同初始破裂位置对地震动参数的影响,结果表明:1初始破裂位置越靠近地表,地震动的峰值越大,而且初始破裂位置对地震动的加速度影响最大,对速度和位移的影响较小;2对地震动不同分量的分析表明,初始破裂位置对地震动的垂直断层分量影响较大,对平行断层和竖向分量影响很小;3初始破裂位置深度的增大会降低地表地震动的幅值,但是断层破裂不同方向上的地震动幅值相对差异仍然存在。因此,断层面上的初始破裂位置也是地震动模拟和预测中需要考虑的一个重要因素。
[Abstract]:The near-fault seismic movement is significantly affected by the seismic focal parameters. Based on the typical finite fault model, the discrete wave number finite element numerical simulation method is used. The time history of ground motion at three possible initial rupture sites on the fault is calculated, and the effects of different initial rupture locations on the ground motion parameters are compared. The results show that the initial rupture location of 1 is closer to the surface. The larger the peak value of ground motion, and the greater the effect of initial rupture position on the acceleration of ground motion, the smaller the effect on velocity and displacement is, the analysis of the different components of ground motion shows that the initial rupture position has the greatest influence on the acceleration of the ground motion. The effect of initial fracture location on vertical fault component of ground motion is greater than that on parallel fault and vertical component. The amplitude of ground motion will be reduced by increasing the depth of initial rupture position. However, there are still relative differences in the amplitude of ground motion in different directions of fault rupture. Therefore, the location of initial rupture on fault plane is also an important factor to be considered in the simulation and prediction of ground motion.
【作者单位】：中国地震局工程力学研究所地震工程与工程振动重点实验室;哈尔滨工业大学土木工程学院;
【基金】：国家自然科学基金重点和面上项目(51238012,51578516) 国家重点基础研究发展计划项目(2011CB013601) 国家国际合作项目(2012DFA70810) 黑龙江省青年科学基金(QC2011C058) 中国地震局工程力学研究所基本科研业务专项(2011B02)
【分类号】：TU311.3;P315.9

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