防灾减灾工程学报2017，Vol.37Issue(1)：25-32,8.DOI:10.13409/j.cnki.jdpme.2017.01.004
SV波入射下断层参数对地表地震动的影响
Influence of Fault Characteristics on Ground Motion for Incident SV Waves
摘要
Abstract
A numerical solution to 2—D fault site model for incident SV waves was derived by using the explicit finite element combining transmitting boundary,and the distribution rules of site ground motion influenced by different fault characteristics,such as width and shear wave ve locity of fault fracture zone,incidence angle of the seismic radiation,are discussed.The numerical simulation shows that transform waves can develop inside low-velocity-fault-zone (LVFZ) when struck by external incident seismic radiation,and trapped waves can develop obviously inside the LVFZ.This result implies that the invariance of energy,struck by external incident seis mic radiation,is congregated at the LVFZ,and the convergence effect increases with the increasing of the width and the decreasing of the shear wave velocity of the LVFZ.The vertical LVFZ can obstruct the spread of oblique incidence seismic wave,and the isolation effect decreases with the increasing incidence angle.The study about the seismic response of a variety of LVFZ models with different width and velocity struck by external vertically incident seismic radiation implies that,the amplification characteristics of ground motion in near fault zone site are frequency de pendent.The lower frequency components of seismic radiation are amplified obviously by the LVFZ sites with lower dominant frequency (these have wider width or lower shear wave velocity),rather than vice versa.关键词
非发震断层场地/断层破碎带/断层陷波/集聚放大效应/频率相关/隔震效应Key words
non-causative fault site/fault fracture zone/trapped wave/convergence effect/frequency dependent/isolation effect分类
天文与地球科学引用本文复制引用
刘必灯,王伟,彭小波,周正华,于淼..SV波入射下断层参数对地表地震动的影响[J].防灾减灾工程学报,2017,37(1):25-32,8.基金项目
国家自然基金项目(51208107,51208234,51308118)、中央高校基本科研业务专项(ZY20120103)资助 （51208107,51208234,51308118）
