Analysis of site-response residuals from empirical ground-motion models to account for observed sedimentary basin effects in Wellington, New Zealand

IF 3.1 2区 工程技术 Q2 ENGINEERING, CIVIL
Christopher A de la Torre, Brendon A Bradley, Robin L Lee, Ayushi Tiwari, Liam M Wotherspoon, Joel N Ridden, Anna E Kaiser
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Abstract

Analysis of prediction–observation residuals from the empirical ground-motion models (GMMs) used in the 2022 New Zealand National Seismic Hazard Model (NZ NSHM) update indicates a general underprediction of ground motions in the period range of [Formula: see text] s for soft sedimentary basin sites in Wellington. This study uses residual analysis to quantify this underprediction, understand the spatial distribution of these residuals and the specific conditions that cause them, and investigate options for the development of non-ergodic site-response adjustments to the GMMs. All 15 GMMs used in the NZ NSHM were evaluated, and the variability in site-response residuals between different models and different tectonic types of earthquake sources was quantified. Sites are regionalized based on different geomorphic features, such as individual basins and valleys. For example, average site terms are calculated for Te Aro, Thorndon, Miramar, Lower Hutt, Upper Hutt, and several smaller valleys. The period at which maximum underprediction occurs at these sedimentary basin and valley sites was found to correlate well with the fundamental site period of the soil profile [Formula: see text], suggesting improvements can be made to regionalized GMMs by incorporating site period into the site-response prediction for sedimentary basin sites.
分析经验地动模型的场地响应残差,以解释新西兰惠灵顿观测到的沉积盆地效应
对 2022 年新西兰国家地震危险性模型(NZ NSHM)更新中使用的经验地动模型(GMMs)的预测-观测残差分析表明,惠灵顿软沉积盆地场地在[公式:见正文]s 周期范围内的地动普遍预测不足。本研究使用残差分析来量化这种预测不足的情况,了解这些残差的空间分布以及导致这些残差的具体条件,并研究对全球地震监测模型进行非啮合站点响应调整的方案。对新西兰国家地震现场监测系统中使用的所有 15 个 GMM 进行了评估,并量化了不同模型和不同构造类型地震源之间的现场响应残差变化。根据不同的地貌特征,如各个盆地和山谷,对场地进行了区域化处理。例如,计算了 Te Aro、Thorndon、Miramar、Lower Hutt、Upper Hutt 和几个较小山谷的平均站点项。研究发现,在这些沉积盆地和山谷站点出现最大预测不足的周期与土壤剖面的基本站点周期有很好的相关性[公式:见正文],这表明通过将站点周期纳入沉积盆地站点的站点响应预测,可以改进区域化 GMM。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Earthquake Spectra
Earthquake Spectra 工程技术-工程:地质
CiteScore
8.40
自引率
12.00%
发文量
88
审稿时长
6-12 weeks
期刊介绍: Earthquake Spectra, the professional peer-reviewed journal of the Earthquake Engineering Research Institute (EERI), serves as the publication of record for the development of earthquake engineering practice, earthquake codes and regulations, earthquake public policy, and earthquake investigation reports. The journal is published quarterly in both printed and online editions in February, May, August, and November, with additional special edition issues. EERI established Earthquake Spectra with the purpose of improving the practice of earthquake hazards mitigation, preparedness, and recovery — serving the informational needs of the diverse professionals engaged in earthquake risk reduction: civil, geotechnical, mechanical, and structural engineers; geologists, seismologists, and other earth scientists; architects and city planners; public officials; social scientists; and researchers.
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