Collection, Documentation and Dissemination of Strong Motion Data From Recent Large Earthquakes in Japan

日本近期大地震强震数据的收集、记录和传播

• 批准号: 9527929
• 负责人: Paul Somerville
• 金额: $ 8.42万
• 依托单位: URS Group, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-07-01 至 1999-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9527929&HistoricalAwards=false
• 关键词: Collection; Documentation; Dissemination; Strong; Motion

9527929 Somerville The objectives of this project are to gather and provide access to digital strong motion recordings from recent large Japanese earthquakes; to document the source, path and site parameters required for the interpretation and use of the data; to compare them with attenuation relations used in the United States; and provide commentary on their relevance to ground motions in the United States. The aim is to provide basic data for use by the earthquake engineering research community. In the two year period between January 15, 1993 and January 17, 1995, five major earthquakes occurred and were widely recorded in Japan. The smallest of these earthquakes, the magnitude 6.9 Kobe earthquake of January 17, 1995, was the most damaging because of its occurrence in a dense urban region. The four other earthquakes, with magnitudes in the range of 7.5 to 8. 1, occurred in subduction zones, and were all larger than any earthquake in the United States for which we have strong motion recordings. These strong motion data are difficult to acquire, and most investigators in the United States do not know how to acquire them. Further, the data cannot be directly used in the development of empirical ground motion models because different magnitude scales are used in Japan as compared to the USA (JMA magnitude instead of moment magnitude); and epicentral distance is used in Japan instead of the closest distance to the fault. These conditions result in the underutilization of these potentially valuable strong motion data. The project involves the following: 1. Gather digital strong motion time histories together with the many categories of information that are required for the interpretation and use of the time histories. These include source parameters such as seismic moment, focal mechanism and tectonic category; path parameters describing the closest distance to the recording site; and available geotechnical data from the recording sites. 2. Using these data, c ompare the Japanese ground motions with corresponding empirical attenuation relations used in the United States. 3. Based on this comparison, prepare a commentary on the records describing their appropriateness for particular seismic source regions in the United States. The digital time histories, parameter information, comparisons, and commentary will be archived on the Internet and provided to the National Geophysical Data Center in Boulder, Colorado. The proposed work will implement all of the major recommendations of the 1993 International Workshop on Strong Motion Data concerning the dissemination of strong motion data from recent earthquakes in Japan. ***

9527929萨默维尔该项目的目标是收集和提供日本最近大地震的数字强震记录;记录解释和使用数据所需的震源、路径和场地参数;将其与美国使用的衰减关系进行比较;并就其与美国地面运动的相关性提供评论。目的是为地震工程研究界提供基础数据。 在1993年1月15日至1995年1月17日的两年时间里，日本发生了五次大地震，并被广泛记录在案。这些地震中规模最小的是1995年1月17日发生的6.9级科比地震，由于发生在人口密集的城市地区，因此破坏性最大。其他四次地震，震级在7.5到8级之间。1，发生在俯冲带，并且都比我们有强烈运动记录的美国任何地震都大。这些强震数据很难获得，美国的大多数研究人员不知道如何获得它们。此外，这些数据不能直接用于经验地面运动模型的开发，因为与美国相比，日本使用不同的震级尺度（JMA震级而不是矩震级）;日本使用震中距离而不是距离断层最近的距离。 这些条件导致这些潜在的有价值的强运动数据的利用不足。 该项目包括以下内容：1.收集数字强震时间历史以及解释和使用时间历史所需的许多类别的信息。这些参数包括震源参数，如地震矩、震源机制和构造类别;描述与记录地点最近距离的路径参数;以及记录地点的现有岩土工程数据。 2.利用这些数据，将日本的地震动与美国的经验衰减关系进行了比较。 3.根据这一比较，准备一份关于记录的评论，说明其对美国特定震源区的适用性。数字时间历史、参数信息、比较和评论将在互联网上存档，并提供给位于科罗拉多博尔德的国家地球物理数据中心。 拟议的工作将执行1993年国际强震数据讲习班关于传播日本最近地震强震数据的所有主要建议。 ***