Effect of near-fault directivity pulses on ground-motion intensity measure correlations from the NGA-West2 data set

IF 3.1 2区 工程技术 Q2 ENGINEERING, CIVIL Earthquake Spectra Pub Date : 2023-09-23 DOI:10.1177/87552930231199059
Karim Tarbali, Brendon A Bradley, Jack W Baker
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Abstract

This article investigates the correlation coefficients of ground-motion intensity measures for ground motions containing near-fault directivity velocity pulses. These correlation coefficients are necessary to quantify conditional multivariate intensity measure distributions and generate realizations from them for ground-motion selection. The empirical correlations between intensity measures representing ground-motion amplitude, frequency content, duration, and cumulative effects are calculated using the RotD50 definition and compared with published models. The impact of intensity measure definition as in RotD50, RotD100, and the geometric mean is also scrutinized. The sensitivity of the results to the considered ground motion set and the reference ground motion model are addressed in the computations. The results are compared with those from only non-directivity and mixed data sets based on the NGA-West2 database. The results indicate that the adopted data set has the largest influence on the variability of the empirically computed correlation coefficients. Given the multiple sources that contribute to uncertainty in these calculations, the authors conclude that existing models for predicting median correlation coefficients based on mixed data sets are sufficient for use with directivity, non-directivity, and mixed ground motions.
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近断层指向性脉冲对NGA-West2数据集地震动强度测量相关性的影响
本文研究了含有近断层指向性速度脉冲的地震动强度测量的相关系数。这些相关系数对于量化有条件的多变量强度测量分布并从中产生地震动选择的实现是必要的。使用RotD50定义计算了地表运动振幅、频率含量、持续时间和累积效应的强度测量之间的经验相关性,并与已发表的模型进行了比较。强度测量定义的影响,如RotD50, RotD100,和几何平均也进行了审查。计算中讨论了计算结果对所考虑的地震动集和参考地震动模型的敏感性。并与基于NGA-West2数据库的非指向性数据集和混合数据集的结果进行了比较。结果表明,采用的数据集对经验计算的相关系数的变异性影响最大。考虑到导致这些计算不确定性的多种来源,作者得出结论,现有的基于混合数据集预测中位数相关系数的模型足以用于指向性、非指向性和混合地面运动。
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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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