Data Release for Additional Period and Site Class Data for the 2018 National Seismic Hazard Model for the Conterminous United States (ver. 1.1, February 2020)

The updated 2018 National Seismic Hazard Model includes new ground motion models, aleatory uncertainty, and soil amplification factors for the central and eastern U.S. and incorporates basin depths from local seismic velocity models in four western U.S. (WUS) urban areas. These additions allow us, for the first time, to calculate probabilistic seismic hazard curves for an expanded set of spectral periods (0.01 s to 10 s) and site classes (VS30 = 150 m/s to 1,500 m/s) for the conterminous U.S. (COUS), as well as account for amplification of long-period ground motions in deep sedimentary basins in the Los Angeles, San Francisco Bay, Salt Lake City, and Seattle regions. Ground motion data for 2, 5, and 10 percent probability of exceedance in 50 years have been derived from these hazard curves.Two sets of data are available: (1) 0.05 by 0.05 degree gridded hazard data for the COUS and (2) 0.01 by 0.01 degree gridded hazard data for WUS basins.

更新后的2018版国家地震危险性模型（National Seismic Hazard Model）纳入了美国中东部地区的新型地震动模型、随机不确定性参数与土壤放大系数，并整合了美国西部（WUS）四座城市区域基于局部地震速度模型得到的盆地深度数据。本次更新首次实现了美国本土（COUS）范围内多组谱周期（0.01 s至10 s）与VS30场地类别（150 m/s至1500 m/s）的概率地震危险性曲线计算，同时可考量洛杉矶、旧金山湾区、盐湖城及西雅图地区深沉积盆地内的长周期地震动放大效应。基于上述危险性曲线，已推导得到50年超越概率分别为2%、5%与10%的地震动数据。本次数据集包含两套数据：（1）美国本土（COUS）范围的0.05°×0.05°网格化危险性数据；（2）美国西部（WUS）盆地范围的0.01°×0.01°网格化危险性数据。