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Broad-Scale Mapping of Ground Shaking for a Scenario Earthquake Using the Digital National Land

使用数字国家土地对地震情景进行大比例尺地面震动测绘

基本信息

批准号：
14550558
负责人：
MIDORIKAWA Saburoh
金额：
$ 2.24万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550558/
关键词：
Digital National Land Information Ground Shaking Map Attenuation Relationship Site Amplification Factor 2003 Miyagi-Ken-Oki Earthquake 2003 Miyagi-Ken-Hokubu Earthquake 2003 Tokachi-Oki Earthquake

项目摘要

In order to develop the broad-scale mapping technique of ground shaking for a scenario earth quake, attenuation characteristics of peak ground motions are examined based on strong motion recordings from 33 Japanese earthquakes. Considering the different attenuation rates from the regression analysis for the records, the attenuation relationships for peak ground acceleration and velocity, which are applicable to both shallow and deeper earthquakes, are proposed. According to local site effects, nonlinearity of site amplification is examined by using the ground motion records of the 2001 Geiyo earthquake and subsequent smaller events. The analysis of the amplification factors derived from the records of the Geiyo earthquake together with those of the 1989 Loma Prieta and 1994 Northridge earthquakes indicates that the nonlinear effect n peak ground velocity is not apparent up to the strain level of about 1×10^<-3>. Based on these results, the broad-scale mapping technique of ground shaking for a scenario earthquake is developed. In order to confirm the validity of the ground-shaking mapping techniques, the distributions of seismic intensity calculated from the techniques are compared with the actual isoseismal maps during the Miyagi-ken-oki earthquake on May 26, the Miyagi-ken-hokubu earthquake on July 26, and the Tokachi-oki earthquake on September 26 in 2003. A comparison for the earthquake shows that the computed maps are in good agreement with the observed map.

为了发展大尺度模拟地震的地面震动制图技术，根据日本33次地震的强震记录，研究了峰值地面运动的衰减特性。考虑到对记录进行回归分析得到的衰减率不同，提出了适用于浅源地震和深源地震的峰值加速度和峰值速度衰减关系。根据场地的局部效应，利用2001年Geiyo地震和随后较小地震的地震动记录，研究了场地放大效应的非线性。对1989年日本嘉约地震、1989年洛马普列塔地震和1994年北岭地震记录的放大因子进行了分析，结果表明，峰值地速度的非线性效应在1×10^应变水平以下不明显<-3>。在此基础上，发展了大尺度模拟地震地面震动图绘制技术。为了验证该方法的有效性，将2003年5月26日宫城县冲地震、7月26日宫城县北部地震和9月26日十胜冲地震的实际地震烈度分布图与该方法计算的地震烈度分布图进行了比较。对该次地震的对比表明，计算图与观测图吻合较好。