VALIDATION STUDY OF GROUND MOTION MODEL THROUGH SIMULTANEOUS SIMULATION TEST AGAINST THE 1995 HYOGO-KEN NANBU EARTHQUAKE

1995年兵库县南部地震同步模拟试验地震动模型验证研究

基本信息

批准号：
08650670
负责人：
KAWANO Masahiro
金额：
$ 1.6万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650670/
关键词：
Hyogo-ken Nanbu Earthquake wave propagation theory prediction of ground motion simultaneous simulation test one-dimensional surface soil sediment model 設計用地震動モデル

项目摘要

The forward prediction model of ground motion integrating source, site and propagation characteristics has been developed using wave propagation theory and source kinematics. The refined model of wave propagation path from source to site is expressed as the multi-layred half-space which consists of a surface layr overlying a semi-infinite random medium. The source rupture process is expressed as the summation of the slip functions to subevents which develop in compliance with a degree of the random heterogeneity on the fault surface. The physical laws and key parameters have been presented to describe essentially the waveform, spectral characteristics, site amplification, the effective mechanism radiating short period waves, and the directivity of the source radiation. In this paper, the prediction potential of the ground motion model is examined through a simultaneous simulation test against the recorded seismograms of ground motion at sites KBU(Kobe University, the Committee of Earth … More quake Observation and Research in the Kansai area), KEN(Kansai Electric Power Co. Inc.), and MAT(Matsumura-gumi Technical Research Institute)during the Hyogo-Ken Nanbu earthquake of January 17,1995. They are strongly conditioned by not only the site amplification but also by the source dynamics because these sites are located just above the faulting region. The soil sediment structures and geological structures of basement crust for these sites were investigated by a seismic reflection survey, observed weak ground motions, PS logging and boring data. The geological profiles in and around Kobe City are fan-shaped, consisting of thick surface layr with a fault-like irregular boundary, dipping from north to south, and overlying basement bedrock^4. In this prediction test, the surface soil sediment and basement bedrock beneath each recording site in Kobe City are idealized by a multi-layred half-space overlying a semi-infinite random medium. The Green's functions from the discrete source points on the fault surface to each site are calculated precisely according to the geological data. Seliguchi et. al. estimated the slip vectors distribution to describe the source rupture process by solving the inverse problem for the observed ground motion. In this study, the prediction potential of the ground motion model is investigated through a simultaneous simulation test using the seismograms at the KBU,KEN,and MAT sites. The synthetic ground motion at the three sites are expressed by their Green's functions of the multi-layred half-space and the single source function which is described by slightly modifying the slip vectors distribution by Sekiguchi et. al.. The synthetic ground motions agree well with the observed ones at all the sites in the waveforms and response spectra. Less

地面运动整合源，位点和传播特征的正向预测模型是使用波传播理论和源运动学开发的。从源到位点的波传播路径的精制模型表示为多层半空间，该半空间由上覆盖半无限随机培养基的表面层组成。源破裂过程表示为将滑移函数的总和到符合断层表面上一定程度的随机异质性而发展的子事件。已经提出了物理定律和关键参数，以描述波形，光谱特征，位点放大，有效机制辐射短期波和源辐射的方向性。在本文中，通过同时模拟测试对地面运动模型的预测潜力进行了研究，以针对KBU站点的地面运动的记录地震图（科比大学，地球委员会，地球委员会…更多的Quake观察和研究和研究，Ken（Kansai Electric Power Co. co. kansai Area），kansai Electric Power Co. Co. 1995年，它们不仅是由位点放大的，而且还通过源动力学，因为这些位置的土壤沉积物结构和地下室的地质结构都在地下室的地下室进行了调查。在此预测测试中，从北到南部的不规则边界，地下室底层^4 ET。通过在本研究中求解源的分布来描述源的破裂过程。通过Sekiguchi等修改滑动载体分布