There is a significant difference between the spatial distribution of ground motion along cross-fault regional areas (Ground motion in the area of the extreme proximity to the fault where the cross-fault engineering structures are located,referred to as cross-fault ground motion) and near-site ground motion.The lack of records on cross-fault ground motion poses challenges to studying the seismic resistance of cross-fault structures.This paper aims to outline the basic theory of the broadband hybrid method for simulating ground motion,and examines the distribution pattern of cross-fault ground motion using the Zemu River fault as a case study.The results indicate that the simulated cross-fault ground motion aligns with the fault sliding mode,displaying significant directional,up-disk effect,and slip-impact effect.Generally,the intensity of the simulated cross-fault ground motion follows a certain attenuation law.However,it is influenced by fault rupture,which can result in irregularities or even a counter-law phenomenon.Furthermore,the actual location of surface rupture and the zone of large slip along the fault have a substantial impact on the distribution pattern of cross-fault ground motion.By employing the broadband hybrid method,artificial cross-fault ground vibration time series can be generated to address the lack of recorded cross-fault ground motion.This methodology provides substantial support for research on the seismic resistance of cross-fault structures.
关键词
跨断层地震动/左旋逆走滑断层/地震动分布规律/宽频带混合法/断层破裂模型
Key words
cross-fault ground motion/left-rotation reverse-slip faults/distribution pattern of ground motion/broadband hybrid method/fault rupture model
维普
万方数据