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首页> 外文期刊>Journal of Asian earth sciences >Seismic effects of a small sedimentary basin in the eastern Tibetan plateau based on numerical simulation and ground motion records from aftershocks of the 2008 Mw7.9 Wenchuan, China earthquake
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Seismic effects of a small sedimentary basin in the eastern Tibetan plateau based on numerical simulation and ground motion records from aftershocks of the 2008 Mw7.9 Wenchuan, China earthquake

机译：基于数值模拟和2008年汶川7.9级汶川地震余震的地震动记录，对青藏高原东部小沉积盆地的地震作用

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摘要

In this study, the ground motions that can be attributed to the aftershocks of the 2008 Mw7.9 Wenchuan, China earthquake recorded in the Wudu basin, which is a small basin in the eastern Tibetan Plateau, are analyzed to investigate the seismic effect of a small sedimentary basin. In case of the Wudu basin, the site responses from the basin edge are stronger than those from the basin center, the monitoring sites located near the Wudu basin edge and the Wudu basin center are sensitive to the low-frequency ( < 3 Hz) and high-frequency ( > 5 Hz) components of ground motion, respectively. It indicates that some different seismic phenomena occurred in a small sedimentary basin compared with a large sedimentary basin. To further study the ground motion in a small sedimentary basin, a simulation of the Wudu basin was conducted using the finite element method with a viscous-elastic artificial boundary. The grid size of the surface layer of the basin is 2.5 x 2.5 m(2), and high-frequency (up to 10 Hz) components of a synthetic waveform were obtained. The simulation denoted that the surface wave initially appeared in the Wudu basin edge and subsequently propagated into its interior. The near-surface soil layers, exhibiting a relatively low wave velocity, magnified the amplitude of the seismic wave in the Wudu basin. Furthermore, the numerical simulation results are basically consistent with the actual ground motion records, especially with the same predominant frequencies of ground motions at the sites located near the Wudu basin edge.
机译：在这项研究中，对可归因于青藏高原东部小盆地武都盆地记录的2008年汶川7.9级汶川地震余震的地震动进行了研究，以调查该地区的地震作用。小沉积盆地。以武都盆地为例，盆地边缘的站址响应要强于盆地中心，位于武都盆地边缘和武都盆地中心附近的监测站对低频（<3Hz）和地震动的高频（> 5 Hz）分量。这表明与大型沉积盆地相比，小型沉积盆地发生了一些不同的地震现象。为了进一步研究小型沉积盆地中的地震动，利用粘弹性人工边界的有限元方法对武都盆地进行了模拟。盆地表层的网格大小为2.5 x 2.5 m（2），并获得了合成波形的高频（高达10 Hz）分量。模拟表明，表面波最初出现在武都盆地边缘，随后传播到其内部。近地表土层具有相对较低的波速，放大了武都盆地地震波的振幅。此外，数值模拟结果与实际的地震动记录基本吻合，特别是在五渡盆地边缘附近站点的地震动的主要频率相同的情况下。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第may1期|104257.1-104257.8|共8页
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    Chinese Acad Sci Haixi Inst Quanzhou Inst Equipment Mfg Quanzhou 362200 Peoples R China;

    Inst Earthquake Engn Jiangsu Prov Nanjing 210014 Peoples R China;

    Beijing Univ Technol Coll Architecture & Civil Engn Beijing 100124 Peoples R China|China Earthquake Adm Inst Geophys Beijing 100081 Peoples R China;

    Nanjing Tech Univ Coll Transportat Sci Engn Nanjing 210009 Jiangsu Peoples R China;

    Univ Paris Est Lab Modeling & Simulat Multiscale CNRS MSME UMER 8205 5 Bd Descartes Bat Lavoisier F-77454 Marne La Vallee 2 France;

    Beijing Univ Chem Technol Dept Safety Engn Coll Mech & Elect Engn Beijing 100029 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Wenchuan earthquake; Strong ground motion record; Small sedimentary basin; Viscous-elastic artificial boundary; Numerical simulation; Seismic wave input;

    机译：汶川地震;强大的地面运动记录;小沉积盆地;粘弹性人工边界;数值模拟;地震波输入;

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