| 地震动非参数化谱反演可靠性分析 |
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| 引用本文： | 王宏伟,任叶飞,温瑞智,周影.地震动非参数化谱反演可靠性分析[J].西南交通大学学报,2022,57(1):182-190. |
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| 作者姓名： | 王宏伟 任叶飞 温瑞智 周影 |
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| 作者单位： | 1.中国地震局工程力学研究所, 黑龙江 哈尔滨 1500802.中国地震局地震工程与工程振动重点实验室, 黑龙江 哈尔滨 150080 |
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| 基金项目： | 国家自然科学基金（51808514,51878632）；;黑龙江省自然科学基金（YQ2019E036）； |
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| 摘 要： | 非参数化谱反演是研究地震动震源、传播路径及场地效应的关键技术,反演的可靠性对地震震源物理的准确认识及地震危险性的有效预测具有重要影响.?为分析震源和场地项权衡的约束条件、单步法/两步法的选择、震源参数估计等关键环节对反演可靠性的影响,以2016—2017年意大利中部地震序列的地震动谱反演为例,给出确保反演可靠性的合理建...
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| 关 键 词： | 地震动 谱反演 可靠性 参考场地 震源参数 |
| 收稿时间： | 2020-04-26 |
Reliability Analysis on Non-Parametric Spectral Inversion of Seismic Ground Motion |
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| WANG Hongwei,REN Yefei,WEN Ruizhi,ZHOU Ying.Reliability Analysis on Non-Parametric Spectral Inversion of Seismic Ground Motion[J].Journal of Southwest Jiaotong University,2022,57(1):182-190. |
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| Authors: | WANG Hongwei REN Yefei WEN Ruizhi ZHOU Ying |
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| Affiliation: | 1.Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China2.Key laboratory of Earthquake Engineering and Engineering Vibration, China Earthquake Administration, Harbin 150080, China |
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| Abstract: | Non-parametric spectral inversion is the key technology to study the seismic source, propagation path and site effects. The reliability of spectral inversion was responsible for exactly understanding seismic source physics and effectively predicting seismic hazards. In this work, the non-parametric spectral inversion of ground motions during the 2016—2017 central Italy seismic sequence was used to systematically evaluate how the reliability of spectral inversion was dominantly controlled by several decisive factors, i.e., constraints for trade-offs between source and site terms, selection of one- or two-step non-parametric inversion methods, and potential effects of trade-offs among the parameters describing source spectra on their estimations. Results show the crucial effects of reference site on the inversion reliability. Multiple trials for the source spectra and source parameters were necessary for selecting the appropriate reference sites, which were preliminarily regarded as rock sites based on the surface geological information, the horizontal-to-vertical spectral ratios, etc. The usage of either one- or two-step method has obvious effects on high-frequency propagation path attenuation at far fields. However, negligible effects occurred on source parameter estimates. The one-step method was preferred because the path attenuation given by two-step method could be interfered by the site term. In order to eliminate the effects of trade-offs between corner frequency (fc) and high-frequency decay parameter, low- and intermediate-frequency source spectra were suggested to estimate the moment magnitude and corner frequency. It was found that trade-offs between the moment magnitude and corner frequency have weak effects on their estimations for the cases of fc > 0.5Hz. Predefined the moment magnitude can be included for the reliable corner frequency estimates for those large events with small corner frequency. |
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