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Physics-based seismic input for engineering applications: a case study in the Aterno river valley, Central Italy

机译:基于物理的工程应用抗震投入 - 以意大利河河谷河谷为例

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In this paper, we present 3D physics-based numerical simulations, in the near-source region at the regional scale, of the 2009, April 6, L'Aquila earthquake (central Italy), based on improved models of the Aterno river basin geology and source kinematics. The simulations were carried out by an open-source code, SPEED, based on a discontinuous Galerkin spectral element method. The numerical mesh of the Aterno basin was built on a detailed subsurface geological model and on the evaluation of the dynamic properties of the soils. The source model was selected among the kinematic solutions available in the literature as the one that fits best the near-source observations. Broadband ground motions were then generated through a hybrid method, combining 3D low frequency waveforms with high-frequency stochastic synthetics. To provide an example of application as seismic input to earthquake engineering analyses in the time domain, results of this approach were used for 2D site response analyses at Castelnuovo, a village severely damaged by the earthquake, and in the neighborhood of which no seismic record was available. SPEED simulation satisfactorily reproduces the recorded accelerograms in the frequency range 0.1-0.7 Hz. The site response analysis at the local scale shows that the amplification of the hill is more significant at its natural frequency, due to topographic and stratigraphic factors, than at the peak of the seismic input simulated by SPEED, that is at about 3 s along the fault-normal component. The presented application supports the conclusion that 3D physics-based numerical simulations do have the potential to become an alternative for determination of input ground motion for earthquake engineering analyses, especially for those scenarios for which real records are not available.
机译:在本文中,我们基于阿泰诺河流域地质和震源运动学的改进模型,在2009年4月6日拉奎拉地震(意大利中部)的区域尺度近震源区进行了基于三维物理的数值模拟。模拟由一个基于间断伽辽金谱元方法的开源代码SPEED进行。Aterno盆地的数值网格建立在详细的地下地质模型和土壤动态特性评估的基础上。源模型是从文献中可用的运动学解中选择的,最适合近源观测。然后通过一种混合方法生成宽带地震动,将三维低频波形与高频随机合成相结合。为了提供一个将地震输入应用于时域地震工程分析的示例,该方法的结果被用于Castelnuovo的二维场地反应分析,Castelnuovo是一个受地震严重破坏的村庄,附近没有地震记录。速度模拟令人满意地再现了0.1-0.7 Hz频率范围内记录的加速度图。局部尺度的场地响应分析表明,由于地形和地层因素,山丘在其固有频率下的放大比在速度模拟的地震输入峰值时更为显著,即沿断层正常分量约3s处。该应用程序支持以下结论:基于三维物理的数值模拟确实有可能成为地震工程分析中确定输入地震动的替代方法,尤其是在没有真实记录的情况下。

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