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Ground Motion of Subduction Earthquakes for Seismic Design

用于抗震设计的俯冲地震地面运动

基本信息

批准号：
05044089
负责人：
OHMACHI Tatsuo
金额：
$ 4.8万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

项目摘要

1. Site investigation at strong-motion sites in the central part of Chile.At 9 strong-motion sites where strong-motion records have been obtained in the 1985 Central Chile earthquake, microtremor array observations were conducted to estimate the shear-wave velocity profiles at the sites. The microtremors were also observed in Santiago where the strong-motion array have been developed. The results contributed to complete information about site characteristics at strong-motion sites in the central part of Chile.2. Construction of strong-motion databaseThe database of the strong-motion records from Chilean and Japanese earthquakes were constructed. About 100 Chilean data and more than 500 Japanese data were compiled in the database. In the database, imformation about site characteristics of the strong-motion sites were also included.3. Analysis of strong-motion records from subduction earthquakesGround motion parameters such as peak ground acceleration, velocity and response spectra were computed for strong-motion records in the database. The source, propagation path and site effects on the ground motion parameters were analyzed. The results indicate that (1) site effects are significant in longer periods, (2) the amplitude of ground motion increases with increase of the source depth, (3) earthquakes in the ocean plate tend to generate stronger seismic waves than those in the continental plate, and (4) attenuation of seismic waves from large earthquakes in the ocean plate is smaller.4. Evaluation of ground motion characteristics from large subduction earthquakesEmpirical relationships for predicting peak acceleration and velocity were proposed in terms of earthquake magnitude, fault distance, source depth, and average shear-wave velocity of ground. It was also pointed out that ground motion from large subduction earthquakes is considered to have longer-period contents, smaller attenuation decay, and larger amplitudes from deeper events.

1.智利中部强震场地的现场调查：在1985年智利中部地震中获得强震记录的9个强震场地，进行了微动台阵观测，以估计场地的剪切波速度剖面。在圣地亚哥也观测到了微震，那里的强震台阵已经研制成功。研究结果为智利中部强震场地特征提供了完整的信息.强震数据库的建立建立了智利和日本地震强震记录数据库。数据库中汇编了大约100个智利数据和500多个日本数据。在数据库中，还包括强震场地的场地特征信息.俯冲地震的强震记录分析计算了数据库中强震记录的地震动参数，如峰值地面加速度、速度和反应谱。分析了地震动的震源、传播路径和场地效应对地震动参数的影响。结果表明：（1）场地效应在较长周期内是显著的;（2）地震动振幅随震源深度的增加而增大;（3）海洋板块地震比大陆板块地震产生的地震波更强;（4）海洋板块大地震的地震波衰减较小.大规模俯冲地震地震动特征的评价本文提出了预测峰值加速度和速度的经验关系式，这些关系式涉及地震震级、断层距离、震源深度和地面平均剪切波速度。同时指出，俯冲型大地震的地震动具有较长的周期、较小的衰减衰减和较大的振幅。