Simulation of 3-Dearthquake motions considering faultrupture mechanism.

考虑断层破裂机制的三地震运动模拟。

• 批准号: 10650465
• 负责人: MIURA Fusanori
• 金额: $ 1.47万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650465/
• 关键词: Fault Rupture; Numerical Simulation; 3-D analysis; FEM; Earthquake motion; Northridge earthquake; 断層破壊過程; 地震波形; シミュレーション; 固着滑り実験; 平均食い違い; 応力降下量; 非線形有限要素法

By performing parametric study with different magnitude and distribution of stress drop, yield stress and initial stress along the fault, and the magnitude of mesh size of the finite element models, we could obtain the following outcomes.(1) There was a linear relationship between the average dislocation and the average stress drop irrespective of the magnitudes of initial stress and yield stress.(2) The average rupture velocity depended on the difference between the yield stress and the initial stress. The larger the difference, the smaller the average rupture velocity. When the difference was small, the rupture velocity exceeded the S-wave velocity, but not the P-wave velocity.(3) The frequency characteristics of simulated ground motion by the proposed method strongly depended on the mesh size of the finite element model. There was the cut-off frequency depended on the body wave velocities and length of the finite element mesh. The cut-off frequency closely resembled the Nyquist frequency when the length of the element is equal to half of the corresponding wave length..The simulated ground motions, such as accelerations, velocities and displacements for the 1994 Northridge earthquake had similar magnitude of amplitudes and frequency characteristics in low frequency range to the recorded ground motions, which implies the validity of the proposed method.

通过对不同应力降、屈服应力和初始应力的大小和分布以及有限元模型的网格大小进行参数研究，可以得到以下结果：(1)平均位错与平均应力降之间存在线性关系，与初始应力和屈服应力的大小无关。(2)平均破裂速度取决于屈服应力和初始应力之间的差值。差值越大，平均破裂速度越小。当两者相差较小时，破裂速度超过S波的速度，但不超过P波的速度。(3)有限元模型的网格尺寸对所模拟的地震动的频率特性有很强的依赖性。截止频率与体波速度和有限元网格长度有关。当单元长度等于相应波长的一半时，截断频率与奈奎斯特频率非常接近，1994年北岭地震的加速度、速度和位移等模拟地面运动在低频范围内的振幅和频率特征与记录的地面运动相似，这表明该方法的有效性。

项目成果

Toshihiro Tsuboi and Fusanori Miura: "Simulation of Near Field Seismic Ground Motions by FEM Considering Source Rupture Mechanism."Proc.of the 12 World Conf.on Earthquake Engineering.. CD-ROM. Paper No.271/4/A (2000)

Toshihiro Tsuboi 和 Fusanori Miura：“考虑震源破裂机制的 FEM 近场地震地面运动模拟”。第 12 届世界地震工程会议论文集。CD-ROM。

坪井利弘、三浦房紀: "震源特性を考慮したFEMによる地震波の生成シミュレーション"第10回日本地震工学シンポジウム論文集. Volume 1. 117-122 (1998)

Toshihiro Tsuboi、Fusunori Miura：“考虑震源特性的有限元地震波生成模拟”第 10 届日本地震工程学会论文集第 1 卷 117-122（1998 年）。

三浦房紀,坪井利弘,水本学千: "有限要素法によるノースリッジ地震記録のシミュレーション"第25回地震工学研究発表会講演論文集. Volume 1. 109-112 (1999)

Fusunori Miura、Toshihiro Tsuboi、Manabu Mizumoto：“使用有限元方法模拟北岭地震记录”第 25 届地震工程研究会议论文集第 1 卷 109-112（1999 年）。

Fnsanori Miura, Toshihiro Tsubai and Takahiro Mizumoto: "Simuiation of earthquake ground motions during Northridge earthquake by FEM."Proc.of the 25th conference on earthquake engineering, JSCE. Vol.1. 109-112 (1999)

Fnsanori Miura、Toshihiro Tsubai 和 Takahiro Mizumoto：“用 FEM 模拟北岭地震期间的地震地面运动。”JSCE 第 25 届地震工程会议的会议记录。

T.Tsuboi and F.Miura: "Simulation of Near Field Seismic Ground Motions by FEM Considering Source Rupture Mechanism"Proc. of the 12 World Confenence on Earthquake Engineering. (CDROM). 271-4A (2000)

T.Tsuboi 和 F.Miura：“考虑震源破裂机制的有限元模拟近场地震地面运动”Proc。