Use of Strong-Motion Data from Northridge and Other Los Angeles Events for Improved Mapping of Site Amplification

9416335 Toro这项研究是通过将地质和岩土技术信息与来自北岭、惠蒂尔和其他地震的当地强震数据相结合，在洛杉矶大都会地区制作当地地震反应地图，用于微区划。两种不同的经验贝叶斯更新公式将被开发、测试和应用。经验公式通过比较观测到的峰值幅度和预测的峰值幅度来估计每个记录点的站点项；该公式分别应用于每个频率或频带。物理公式使用观测到的峰值振幅和预测的峰值振幅之间的比较来提取有关物理站点特征的可能值的信息，即速度剖面，模量和阻尼退化曲线；此操作可同时应用于多个频率或频带。然后生成站点扩增的最新估计。该项目是对国家减少地震危害计划的贡献，由北岭地震紧急拨款支持。* * *

9416335 Toro This research is to produce local site earthquake response maps in the Los Angeles metropolitan area for use in microzonation, by combining geological and geotechnical information with local strong-motion data from the Northridge, Whittier and other earthquakes. Two different formulations of the empirical Bayes updating will be developed, tested, and applied. The empirical formulation estimates a site term at each recording site by comparing observed and predicted peak amplitudes; this formulation is applied separately to each frequency or frequency band. The physical formulation uses the comparison between observed and predicted peak amplitudes to extract information about the likely values of physical site characteristics, i.e. velocity profile, modulus and damping-degradation curves; this operation is applied simultaneously at several frequencies or frequency bands. Updated estimates of site amplification are then generated. This project is a contribution to the National Earthquake Hazard Reduction Program and is supported by the Northridge Earthquake Emergency Appropriation. ***