Site-Response Studies for Purpose of Revising NEHRP Seismic Provisions

该项目将在美国国家科学基金会探索性研究小额资助计划（SGER）下进行，一项现场反应研究，作为制定地震现场反应参数的努力的一部分，以便可能纳入未来的国家减少地震灾害计划（NEHRP）地震规定。​将汇编1922年至1989年美国西部记录的强震数据（包括10月17日洛马·普里塔地震的数据）。与此同时，将为记录站收集地质和地质技术数据，这些数据的数量足以充分确定场址。根据对强震和岩土工程现场数据的初步定性评估，将提出初步的地点分类方案，并分别分析每一类地点内的所有数据。将调查每个站点类别内的数据对其他重要因素的依赖性，例如震级、距离和记录站的大小。注意力将集中在数据上，通过统计分析，从潜在破坏性较大的大地震和较短的震中距离。这项研究将用新记录的地面运动数据更新目前的NEHRP规定，这些规定是基于近20年前制定的地点相关反应谱。​该项目由美国国家科学基金会和核管理委员会（NRC）通过机构间协议共同支持。

This project is to conduct, under NSF's Small Grants for Exploratory Research (SGER) Program, a site response study as a part of efforts to develop seismic site-response parameters for possible inclusion into the future National Earthquake Hazards Reduction Program (NEHRP) seismic provisions. Strong-motion data recorded in the western United States between 1922 and 1989 (including the data from the 17 October Loma Prieta earthquake) will be compiled. In a parallel effort, geologic and geotechnical data will be collected for the recording stations wherethe data exist in sufficient quantity to adequately define the sites. Based on an initial qualitative assessment of the strong-motion and geotechnical-site data, a preliminary site-classification scheme will be proposed and all data within each site class will be analyzed separately. The dependence of the data within each site category on other important factors, such as magnitude, distance, and the size of the recording station will be investigated. Attention will be focused on the data, through statistical analyses from the potentially more destructive large magnitude earthquakes and short epicentral distances. This study will update with newly record ground-motion data the current NEHRP provisions which are based on site-dependent response spectra developed almost 20 years ago. This project is jointly supported by NSF and the Nuclear Regulatory Commission (NRC) through an interagency agreement.