应用邻近强震动站点主余震记录的场地及地形效应分析  

Analysis of site and topography effects using strong motion records of the mainshock and aftershocks from nearby stations

作　　者：张世亮 马强[1,2] 陶冬旺 钱亮 李继龙[1,2] 解全才 ZHANG Shiliang;MA Qiang;TAO Dongwang;QIAN Liang;LI Jilong;XIE Quancai(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China)

机构地区：[1]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150080 [2]地震灾害防治应急管理部重点实验室,哈尔滨150080

出　　处：《振动与冲击》2023年第21期200-210,共11页Journal of Vibration and Shock

基　　金：中国地震局工程力学研究所基本科研业务专项基金(2021B08,2019B06)。

摘　　要：2022年01月08日青海门源发生M_(S)6.9级地震,在震源相同、路径类似的条件下,间距5.5 km的地震烈度仪站点观测到的地震动加速度存在较大差异,针对此现象,应用主余震强震动记录,分别使用谱比法和标准谱比法分析了场地效应与地形效应对地震动的影响,并提出了通过移动带通滤波器的高频截止频率来确定地面峰值加速度(peak ground acceleration,PGA)的主要贡献频段的方法。考虑场地效应和地形放大效应等因素,在不同频带内初步分析了PGA偏差较大的原因。On January 8,2022,a M_(S) 6.9 earthquake happened in Menyuan,Qinghai.Under the same source and similar path conditions,ground motion accelerations observed at seismic intensity meter stations with a distance of 5.5 km were quite different.Aiming at this phenomenon,mainshock-aftershock strong ground motion records were used to analyze influences of site effect and topographic effect on ground motion with Nakamura method and Borcherdt method,respectively.Furthermore,a method was proposed to determine the dominant contribution frequency band of peak ground acceleration(PGA) by moving high-frequency cutoff frequency of bandpass filter.By considering site effect and topographic amplification effect,reasons for larger deviation of PGAs were preliminarily analyzed in different frequency bands.

关 键 词：门源M_(S)6.9级地震 谱比法 场地效应 地形效应 非线性场地反应 

分 类 号：P315[天文地球—地震学]