震源初始破裂位置对地表地震动影响分析

胡进军1, 谢礼立1,2

振动与冲击 ›› 2015, Vol. 34 ›› Issue (24) : 66-70.

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PDF(2165 KB)
振动与冲击 ›› 2015, Vol. 34 ›› Issue (24) : 66-70.
论文

震源初始破裂位置对地表地震动影响分析

  • 胡进军1, 谢礼立1,2
作者信息 +

Effect of initial rupture location on earthquake ground motions

  •  HU Jin-jun1   XIE Li-li1, 2
Author information +
文章历史 +

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-field ground motion is subject to be affected by the source parameters of earthquake. Based on a typical finite fault model, by using discrete wavenumber finite element method, ground motion time histories were modeled for different initiation rupture locations. Through analysis of the typical ground motion parameters, results indicate: ①the closer the initiation rupture location to ground surface, the greater the peak value of the ground motion; The acceleration is much more sensitive to the initiation rupture location than the velocity and displacement. ②The fault-normal component is more sensitive to the rupture location than the fault-parallel and vertical component. ③Although the location of initiation rupture may affect the amplitude of ground motion, the directivity features of ground motion still exist in different situation. Thus, the location effect of initial rupture of earthquake should be considered for ground motion modeling and prediction.

关键词

地震断层 / 初始破裂位置 / 地震动参数 / 数值模拟

Key words

earthquake fault / rupture initiation location / ground motion parameters / numerical modelling

引用本文

导出引用
胡进军1, 谢礼立1,2. 震源初始破裂位置对地表地震动影响分析[J]. 振动与冲击, 2015, 34(24): 66-70
HU Jin-jun1 XIE Li-li1, 2. Effect of initial rupture location on earthquake ground motions[J]. Journal of Vibration and Shock, 2015, 34(24): 66-70

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