大洛杉矶地区三维模拟地面运动的盆地效应,用于地震灾害分析

IF 3.1 2区 工程技术 Q2 ENGINEERING, CIVIL Earthquake Spectra Pub Date : 2024-04-03 DOI:10.1177/87552930241232372
Morgan P Moschetti, Eric M Thompson, Kyle Withers
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引用次数: 0

摘要

我们从南加州地震中心(SCEC)CyberShake 项目的长周期([公式:见正文])模拟地动中开发了盆地深度尺度模型(即 "盆地项"),用于南加州沉积盆地内的地震危险性分析。盆地术语使用下一代衰减(NGA)-West-2 地动模型(GMM)作为参考模型,并使用其功能形式,但稍作修改。我们研究了使用两种方法将上 30 米处的时间平均剪切波速度([公式:见正文])纳入这些计算的情况,发现使用特定场址和统一[公式:见正文]对该数据集的盆地项结果影响较小。通过将模拟地动以盆地项为中心,我们将模拟地动绝对水平的信息与有关相对放大的信息(如浅盆地和深盆地站点之间的差异)分离开来。南加州沉积盆地的最新观测结果表明,在相对较浅的盆地深度可能会持续存在额外的放大效应(即当差异深度[公式:见正文]接近于零时,GMM 盆地项应具有正值),我们提出了反映这种可能性的 "居中 "和 "调整 "盆地深度比例模型。模拟修改后的 GMM 适用于大洛杉矶地区盆地内的地壳源和深盆地点([公式:见正文]),其大小和距离由 NGA-West-2 GMM 各参考模式确定。
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Basin effects from 3D simulated ground motions in the Greater Los Angeles region for use in seismic hazard analyses
We develop basin-depth-scaling models (i.e. “basin terms”) from the long-period ([Formula: see text]) simulated ground motions of the Southern California Earthquake Center (SCEC) CyberShake project for use in seismic hazard analyses at sites within the sedimentary basins of southern California. Basin terms use the Next Generation Attenuation (NGA)-West-2 ground-motion models (GMMs) as reference models and use their functional forms with slight modifications. We investigate the use of two approaches to incorporate the time-averaged shear-wave velocity in the upper 30 m ([Formula: see text]) in these calculations and find that the use of site-specific and uniform [Formula: see text] has minor effects on the resulting basin terms for this data set. By centering the simulated ground motions on the basin terms, we separate the information from the simulations about absolute ground-motion level from information relating to the relative amplifications, such as the differences between shallow- and deep-basin sites. Recent observations from sedimentary basins of southern California indicate that additional amplification effect may persist at relatively shallow basin depths (i.e. the GMM basin terms should have positive values when differential depths, [Formula: see text], are near zero), and we present models for “centered” and “adjusted” basin-depth scaling models that reflect this potential. The simulation-modified GMMs are appropriate for crustal sources and for deep-basin sites ([Formula: see text]) within basins of the Greater Los Angeles region, for the magnitudes and distances defined by each of the reference NGA-West-2 GMMs.
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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.
期刊最新文献
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