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

• 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

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

利用波传播理论和震源运动学，建立了综合震源、场地和传播特性的地震动正演预测模型。将震源到场地的波传播路径的精细模型表示为半无限随机介质上覆盖一个表层的多层半空间。震源破裂过程被表示为子事件的滑动函数的总和，这些子事件的发展符合一定程度的随机不均匀性的断层面。给出了从本质上描述短周期波的波形、频谱特征、场地放大、辐射的有效机制和源辐射的方向性的物理规律和关键参数。在本文中，通过对KBU（科比大学，地球委员会）场地记录的地震动地震图进行同步模拟试验，检验了地震动模型的预测潜力 ...更多信息 关西地区的地震观测和研究），KEN（关西电力公司），1995年1月17日兵库县南部地震时，它们不仅受到场地放大的强烈制约，而且还受到震源动力学的强烈制约，因为这些场地正好位于断层区上方。通过地震反射测量、观测到的弱地震动、PS测井和钻孔资料，对这些场地的土壤沉积结构和基底地壳地质结构进行了调查。科比市及其周边地区的地质剖面呈扇形，由厚的表层和断层状的不规则边界组成，从北向南倾斜，并覆盖在基底岩块上^[4]。在本预测试验中，将科比市各记录点下的表层土壤沉积物和基底基岩理想化为覆盖在半无限随机介质上的多层半空间。根据地质资料，精确计算了从断层面离散震源点到各点的绿色函数。Seliguchi et.通过求解观测地震动的反问题，估计了滑移矢量分布，以描述震源破裂过程。在这项研究中，预测潜力的地面运动模型进行了调查，通过同时模拟测试，使用地震记录在KBU，KEN，MAT网站。三个场地的合成地震动分别用多层半空间的绿色函数和单源函数表示，单源函数是通过对Sekiguchi等人的滑移矢量分布作一些修改而得到的。al..合成的地震动波形和反应谱与实测结果吻合较好。少

项目成果

河野允宏、土肥博、松田敏: "関東地震(1923年)の地震動構成について" 日本建築学会大会学術梗概集. 243-244 (1996)

Masahiro Kono、Hiroshi Doi、Satoshi Matsuda：“关东地震的地震运动构成（1923 年）”日本建筑学会会议记录 243-244（1996 年）。

河野允宏: "兵庫県南部地震特別研究委員会、第1回公開シンポジウム 日本建築学会" 地盤と地震動、阪神淡路大震災から一年、-建築および都市の防災性向上へ向けて-, 4 (1996)

河野正博：“兵库县南部地震特别研究委员会，日本建筑学会第一届公共研讨会”地面和地震运动，阪神淡路大地震一年后 - 努力提高建筑和城市的防灾能力 -，4（1996 年） ) )

土肥 博、河野 允宏、松田 敏: "兵庫県南部地震における多点観測記録の同時シミュレーション(その2)" 日本建築学会大会学術講演梗慨集. (1997)257-258

Hiroshi Doi、Masahiro Kono、Satoshi Matsuda：《兵库县南部地震期间多点观测记录的同时模拟（第2部分）》日本建筑学会会议学术讲座摘要集（1997）257-258。

Kawano,M., M.Dohi and S.Matsuda: "A Study on Ground Motion for Seismic Design Based on Wave Propagation Theory and Source Dynamics" Proceedings of the 11th World Conference on Earthquake Engineering. No.716. (1996)

Kawano,M.、M.Dohi 和 S.Matsuda：“基于波传播理论和震源动力学的抗震设计地震动研究”第 11 届世界地震工程会议论文集。

河野允宏、土肥博、松田敏: "兵庫県南部地震における多点観測記録の同時シミュレーション" 日本建築学会大会学術梗概集. 195-1966 (1996)

Masahiro Kono、Hiroshi Doi、Satoshi Matsuda：“兵库县南部地震期间多点观测记录的同步模拟”日本建筑学会会议记录195-1966（1996）。