SUMMARY

On 24 August 2016 at 01:36 UTC a M_L6.0 earthquake struck several villages in central Italy, among which Accumoli, Amatrice and Arquata del Tronto. The earthquake was recorded by about 350 seismic stations, causing 299 fatalities and damage with macroseismic intensities up to 11. The maximum acceleration was observed at Amatrice station (AMT) reaching 916 cm s^–2 on E–W component, with epicentral distance of 15 km and Joyner and Boore distance to the fault surface (R_JB) of less than a kilometre. Motivated by the high levels of observed ground motion and damage, we generate broad-band seismograms for engineering purposes by adopting a hybrid method. To infer the low frequency seismograms, we considered the kinematic slip model by Tinti et al . The high frequency seismograms were produced using a stochastic finite-fault model approach based on dynamic corner-frequency. Broad-band synthetic time-series were therefore obtained by merging the low and high frequency seismograms. Simulated hybrid ground motions were compared both with the observed ground motions and the ground-motion prediction equations (GMPEs), to explore their performance and to retrieve the region-specific parameters endorsed for the simulations. In the near-fault area we observed that hybrid simulations have a higher capability to detect near source effects and to reproduce the source complexity than the use of GMPEs. Indeed, the general good consistency found between synthetic and observed ground motion (both in the time and frequency domain), suggests that the use of regional-specific source scaling and attenuation parameters together with the source complexity in hybrid simulations improves ground motion estimations. To include the site effect in stochastic simulations at selected stations, we tested the use of amplification curves derived from HVRSs (horizontal-to-vertical response spectra) and from HVSRs (horizontal-to-vertical spectral ratios) rather than the use of generic curves according to NTC18 Italian seismic design code. We generally found a further reduction of residuals between observed and simulated both in terms of time histories and spectra.

中文翻译：

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意大利中部2016年阿马特里切特地震的宽带地面运动模拟

概要

2016年8月24日世界标准时间（UTC），一场M _L 6.0地震袭击了意大利中部的几个村庄，其中包括Accumoli，Amatrice和Arquata del Tronto。大约350个地震台站记录了该地震，造成299人死亡，大地震烈度最高达11级。在阿马特里奇站（AMT）观测到的最大加速度在EW分量上达到916 cm s ^–2，震中距离为15 km和Joyner和Boore到断层表面的距离（R _JB）小于一公里。受高水平观测到的地面运动和破坏的激励，我们采用混合方法生成了用于工程目的的宽带地震图。为了推断低频地震图，我们考虑了Tinti的运动滑动模型等。高频地震图是使用基于动态转折频率的随机有限故障模型方法生成的。因此，通过合并低频和高频地震图获得了宽带合成时间序列。将模拟的混合地面运动与观测到的地面运动和地面运动预测方程（GMPE）进行比较，以探索其性能并检索为模拟认可的区域特定参数。在近断层地区，我们观察到，与使用GMPE相比，混合仿真具有更高的检测近源效应和再现源复杂性的能力。确实，在地面运动和观测到的地面运动之间（在时域和频域中）总体上具有良好的一致性，这表明在混合模拟中使用特定于区域的震源缩放和衰减参数以及震源复杂性可以改善地面运动估计。为了将站点效应包括在选定站点的随机模拟中，我们测试了使用源自HVRS（水平-垂直响应谱）和HVSR（水平-垂直谱比）的放大曲线，而不是使用通用曲线根据NTC18意大利抗震设计规范。我们通常发现在时间历史和频谱方面，观察到的和模拟之间的残差进一步减少。我们测试了使用从HVRS（水平-垂直响应频谱）和HVSR（水平-垂直频谱比率）得出的放大曲线，而不是根据NTC18意大利地震设计规范使用一般曲线。我们通常发现在时间历史和频谱方面，观察到的和模拟之间的残差进一步减少。我们测试了使用从HVRS（水平-垂直响应频谱）和HVSR（水平-垂直频谱比率）得出的放大曲线，而不是根据NTC18意大利地震设计规范使用一般曲线。我们通常发现在时间历史和频谱方面，观察到的和模拟之间的残差进一步减少。