National Seismic Hazard Assessment 2018 Web Map

As part of the 2018 National Seismic Hazard Assessment (NSHA), we compiled the geographic information system (GIS) dataset to enable end-users to view and interrogate the NSHA18 outputs on a spatially enabled platform. It is intended to ensure the NSHA18 outputs are openly available, discoverable and accessible to both internal and external users.This geospatial product is derived from the dataset generated through the development of the NSHA18 and contains uniform probability hazard maps for a 10% and 2% chance of exceedance in 50 years. These maps are calculated for peak ground acceleration (PGA) and a range of response spectral periods, Sa(T), for T = 0.1, 0.2, 0.3, 0.5, 1.0, 2.0 and 4.0 s. Additionally, hazard curves for each ground-motion intensity measure as well as uniform hazard spectra at the nominated exceedance probabilities are calculated for key localities.

作为2018年国家地震危险性评估（National Seismic Hazard Assessment，NSHA）的组成部分，我们编制了地理信息系统（Geographic Information System，GIS）数据集，以支持终端用户在具备空间分析功能的平台上查看并查询NSHA18的输出成果。本数据集旨在确保NSHA18的输出结果对内部及外部用户均实现公开可用、可检索且可访问。该地理空间产品源自NSHA18研发过程中生成的数据集，包含两类统一概率危险性图，分别对应50年超越概率10%与2%的情景。上述危险性图针对峰值地面加速度（Peak Ground Acceleration，PGA）以及一系列响应谱周期Sa(T)计算得到，其中T的取值为0.1、0.2、0.3、0.5、1.0、2.0及4.0秒。此外，本数据集还针对每种地震动强度指标计算了危险性曲线，并为关键地点生成了对应指定超越概率的统一危险性谱。