Abstract This work deals with the experimental and numerical evaluation of the local seismic response of Arquata del Tronto area (Marche Region, central Italy), severely struck by the Mw 6.0 August 24th, 2016 earthquake. Arquata main village rises on elongated WNW-ESE-trending ridge of the central Apennines thrust-belt (central Italy), at elevations about 170 m higher than the underlying alluvial valleys where Borgo and San Francesco hamlets are built on. Despite their proximity (less than 500 m), Arquata del Tronto, Borgo and San Francesco reported a different damage distribution after the August 2016 mainshock, suggesting that the seismic response of the area may be controlled by site effects. In order to explore this hypothesis, we evaluated the 2D numerical local seismic response along four representative geological cross-sections passing through Arquata del Tronto, San Francesco and Borgo. Additional 1D analyses were carried out at strategic points along the cross-sections in order to explore the 2D physical phenomena governing the local response. The satisfactory agreement between numerical amplification functions in linear range and experimental amplification functions obtained by the Generalized Inversion Technique (GIT) applied to a large number of aftershocks confirms the substantial reliability of the subsoil models. Numerical analyses representative of the 2016 mainshock were carried out and processed in terms of peak and key ground motion parameters. A comparison with the damage induced by the 2016 mainshock was finally undertaken substantially justifying the observed pattern. This study provides general implications about site response and seismic microzonation in sites characterized by similar complex geological and morphological settings.

中文翻译：

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通过实验方法和数值建模评估复杂场地效应：意大利中部 Arquata del Tronto 的案例历史

摘要 这项工作涉及 Arquata del Tronto 地区（意大利中部马尔凯地区）当地地震响应的实验和数值评估，该地区受到 2016 年 8 月 24 日 Mw 6.0 地震的严重袭击。Arquata 主要村庄位于亚平宁山脉中部冲断带（意大利中部）的细长的 WNW-ESE 走向的山脊上，海拔比博尔戈和圣弗朗西斯科小村庄所在的底层冲积河谷高约 170 m。尽管距离很近（不到 500 m），Arquata del Tronto、Borgo 和 San Francesco 报告了 2016 年 8 月主震后不同的破坏分布，表明该地区的地震响应可能受场地效应控制。为了探索这个假设，我们沿着穿过 Arquata del Tronto、San Francesco 和 Borgo 的四个代表性地质横截面评估了二维数值局部地震响应。在横截面的关键点处进行了额外的一维分析，以探索控制局部响应的二维物理现象。线性范围内的数值放大函数与通过应用于大量余震的广义反演技术 (GIT) 获得的实验放大函数之间的令人满意的一致性证实了底土模型的基本可靠性。对代表 2016 年主震的数值分析进行了处理，并根据峰值和关键地震动参数进行了处理。最终与 2016 年主震造成的破坏进行了比较，从实质上证明了观察到的模式是合理的。本研究提供了具有相似复杂地质和形态环境特征的场地中场地响应和地震微带划分的一般意义。