利用山东地震台网及所接入周边省份共计113个台站(速度型观测)记录329个ML≥2.0地震波形资料,分别利用Atkinson反演方法和Moya方法,得到山东地区介质非弹性衰减关系和台站场地响应。其中,山东地区非弹性衰减关系式为Q(f) =416.7f0.4728,场地响应计算结果表明:大部分台站台基良好,场地响应值在1—2上下波动;部分台站场地响应在高频部分存在放大效应,说明台基有一定风化;部分台站场地响应在高频出现衰减,说明台基可能存在松软沉积层。该研究可为山东地震台网计算地震震源参数提供更加全面的基础数据,对台站场地选址和评价、地震灾害评估和抗震工程设计均具有一定参考意义。
Using seismic waveforms of 329 ML≥2.0 earthquakes recorded at a total of 113 stations (velocity-type observations) in the Shandong Seismic Network and the neighboring provinces accessed by the network, the inelastic attenuation relationship of the medium and the site response of the stations in Shandong are obtained by using the Atkinson inversion method and the Moya method, respectively. Among them, the inelastic attenuation relation in Shandong is Q(f) = 416.7f0.4728, and the results of site response calculation show that: most of the stations have good foundations, and the site response values fluctuate up and down in 1-2; the site response of some stations has amplification effect in the high-frequency part, which indicates that the foundations are weathered to a certain extent; and the site response of some stations has attenuation in the high-frequency, which indicates that the foundation may have loose sediments. Some stations show attenuation at high frequencies, indicating that there may be soft sedimentary layers at the base of the station. This study can provide more comprehensive basic data for the Shandong seismic network to calculate seismic source parameters and has certain reference significance for station site selection and evaluation, seismic hazard assessment, and seismic engineering design.
2024,45(2): 11-19 收稿日期:2023-12-12
DOI:10.3969/j.issn.1003-3246.2024.02.002
基金项目:山东省地震局科研项目(项目编号:YB2205)
作者简介:董腾超(1989—),男,硕士,助理工程师,主要从事地震监测预警研究工作。E-mail:litdong@foxmail.com
*通讯作者:苗庆杰(1980—),男,高级工程师,主要从事数字地震学应用研究工作。E-mail:qjmiao@163.com
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