我国黄土高原地区地震动衰减关系研究的若干进展

Advancements in ground motion attenuation relationship in the Loess Plateau region of China

地震动的衰减关系是指地震动随震级、距离和场地条件等变化的经验关系,近年来在我国亦被称为地震动预测方程,是估计地震动及其影响场的主要方法之一,在地震区划和重大工程场地地震安全性评价中被广泛应用。黄土是一种特殊土,在我国广泛分布。我国黄土高原地区地质构造复杂,新构造活动强烈,中强地震频发,地震动的衰减关系有其特殊性,总结我国黄土高原地区地震动衰减关系的研究成果对促进黄土高原地区抗震研究有重要意义。在简要介绍国内外地震动衰减关系研究的基础上,全面系统地总结我国学者在黄土高原地区的地震烈度衰减关系,基岩和土层场地地震动峰值加速度、峰值速度、峰值位移以及反应谱衰减关系方面的研究成果;评述和讨论在黄土覆盖地区地震动衰减研究领域存在的问题和今后的研究方向。文章的研究工作对从事黄土高原地区地震工程研究的科技人员有重要参考价值。

The attenuation relationship of seismic ground motion is a crucial empirical tool used to estimate the relationship between seismic ground motion and various factors.These factors include earthquake magnitude,distance,and site conditions.Recently,this tool is also called the ground motion prediction equation in China,which is one of the primary methods for estimating seismic ground motion and its influence field.Therefore,it is widely used in seismic zoning and seismic safety evaluation of major engineering sites.Loess is a special soil type that is widely distributed throughout China.In the Loess Plateau of China,which has a complex geological structure,the neotectonic activity is strong and medium-to-strong earthquakes occur frequently.So,the attenuation relationship of seismic motion in this area is unique and complex.Therefore,summarizing the research findings of the ground motion attenuation relationship in the Loess Plateau region of China is significant for promoting seismic research in this area.This paper provides a comprehensive and systematic summary of the research results of Chinese scholars on the attenuation relation of seismic intensity,peak ground acceleration,peak ground velocity,and peak ground displacement in the bedrock and soil sites of the Loess Plateau region.This study also reviews and discusses existing problems and future research directions in the field of ground motion attenuation research in the areas covered with loess.The research results have a significant reference value for scientific and technological personnel engaged in earthquake engineering research in the Loess Plateau region.