State of the Art of Seismic Zonation Map in United States, Site Effect Model and Basin Effect Model
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摘要: 2018版《美国地震危险性图》对地震动模型美国中部和东部地区地震动场地效应模型及西部地区沉积盆地放大等进行了更新，改善了对美国各地地震灾害的描述，并增强了对美国中部、东部地区与西部地区地震动差异的理解。本文分析并论述了2018版《美国地震危险性图》中美国中部和东部地区地震动场地效应模型及西部地区沉积盆地效应模型的主要特征，对我国新一代地震动区划图的编制、修订进行了思考。Abstract: The 2018 US National Seismic Hazard Model has updated the site effect models of ground motion in the central and eastern United States, and the amplification effect of sedimentary basins in the western United States, improving the description of seismic disasters across the United States and the understanding of ground motion differences between the central and eastern United States and the western United States regions. In this paper, the main characteristics of the site effect models of ground motion in the central and eastern United States and the sedimentary basin effect model in the western United States are analyzed and discussed, which triggers the deliberation of seismic zonation map of next generation in China.
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图 1 场地放大系数分布情况（Petersen等，2020）
Figure 1. Distribution of site magnification factors （Petersen et al., 2020）
图 2 不同模型、不同场地类别条件下地震动中值加权平均值分布情况（Rezaeian等, 2021）
Figure 2. Comparison of the 2018 GMM medians at original models and smoothed models, a range of site classes （Rezaeian et al., 2021）
图 3 NGA-West2的4个地震动模型在T=5 s时盆地效应系数与盆地深度的关系（Powers等，2021）
Figure 3. The relationship between basin effect coefficient and basin depth at T=5 s for the four ground motion models of NGA-West2 （Powers et al., 2021）
图 4 原始发布和 2018年美国地质勘探局修改后实施的地震动模型在不同盆地深度条件下对应的加速度反应谱中值对比结果（Powers等，2021）
Figure 4. The models as published and the 2018 USGS implementation of the median spectral acceleration at different basin depth conditions（Powers et al., 2021）
图 5 原始发布和 2018年美国地质勘探局修改后实施的地震动模型在不同盆地深度条件下对应的加速度反应谱中值对比结果（Powers等，2021）
Figure 5. The models as published and the 2018 USGS implementation of the median spectral acceleration at different basin depth conditions （Powers et al., 2021）
表 1 场地类别和盆地深度组合（Powers等，2021）
Table 1. Site class and basin-depth combinations for plots （ Powers et al., 2021）
场地类别-盆地 Vs30/（m·s−1） Z1.0/km（ASK14、BSSA14、CY14模型） Z2.5/km（CB14模型） BC类-默认盆地（$ {V}_{\mathrm{s}30} $-基础） 760 （0.048，0.041，0.041） 0.607 BC类-深盆地（长滩） 760 （0.704，0.704，0.704） 3.830 BC类-浅盆地（旧金山） 760 （0.025，0.025，0.025） 0.850 DE类-默认盆地（$ {V}_{\mathrm{s}30} $-基础） 185 （0.497，0.513，0.513） 3.060 DE类-深盆地（长滩） 185 （0.704，0.704，0.704） 3.830 DE类-浅盆地（旧金山） 185 （0.025，0.025，0.025） 0.850 
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