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首页> 外文期刊>Journal of geophysics and engineering >Strong ground motion simulation for seismic hazard assessment in an urban area
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Strong ground motion simulation for seismic hazard assessment in an urban area

机译：强大的地面运动模拟用于城市地震灾害评估

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Seismic wave propagation and strong ground motion in a number of urban settings are simulated by using the pseudospectral time domain method with staggered grid real fast Fourier transform differentiation. For urban seismic study and damage prevention, simulations of the seismic wave propagation and ground motion need a comprehensive consideration of earthquake type, building structure and three-dimensional velocity structures of the crust and especially the near-surface sediments. The distribution of ground motion in an urban area varies greatly in response to geological structures. Wave interferences between the body wave and the secondary surface wave may result in peak ground motions and high collapse ratio of buildings in urban regions far away from the seismogenic fault. The simulated waveforms using an impulse point source in a 3D velocity structure can be employed to synthesize seismograms of ground motion as Green's function for any prescribed rupture scenario and source functions. The simulated results show that the synthesized seismograms coincide well with the observed seismic waveforms for the 1995 Hyogo-ken Nanbu M7.2 earthquake, which occurred in a heavily urbanized area. The simulation Green's function method is useful for predicting the strong ground motion in an urban region without observed seismic waveforms to provide a useful strong ground motion and hazard scenario for urban planning and earthquake hazard prevention. The present technique is an important supplement to the empirical Green's function method that heavily depends on the availability of local and regional seismicity.
机译：利用具有交错网格真实快速傅里叶变换微分的伪谱时域方法，模拟了许多城市环境中的地震波传播和强地面运动。为了进行城市地震研究和预防破坏，地震波传播和地震动的模拟需要综合考虑地壳特别是近地表沉积物的地震类型，建筑结构和三维速度结构。市区中地面运动的分布随地质结构的变化而变化很大。体波和次表面波之间的波干扰可能会导致地震动峰值和远离震源断层的城市地区建筑物的高倒塌率。对于任何规定的破裂场景和震源函数，可以使用在3D速度结构中使用脉冲点震源的模拟波形来合成地震动地震图，作为格林函数。模拟结果表明，合成的地震图与1995年兵库县南部南部M7.2地震的观测波形非常吻合，该地震发生在城市化程度较高的地区。格林函数模拟方法可用于预测没有观测到地震波形的城市地区的强地面运动，从而为城市规划和地震灾害预防提供有用的强地面运动和灾害情境。本技术是对经验格林函数方法的重要补充，经验格林函数方法在很大程度上取决于局部和区域地震活动的可用性。

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