Evaluation of complex site effects through experimental methods and numerical modelling: The case history of Arquata del Tronto, central Italy
Evaluation of complex site effects through experimental methods and numerical modelling: The case history of Arquata del Tronto, central Italy
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通过实验方法和数值模拟评估复杂场地效应：意大利中部阿尔夸塔德尔特龙托的案例历史
DOI：
10.1016/j.enggeo.2020.105646
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
G. Laurenzano
中科院分区：
文献类型：
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作者：
S. Giallini;A. Pizzi;A. Pagliaroli;M. Moscatelli;G. Vignaroli;P. Sirianni;M. Mancini;G. Laurenzano
这项工作涉及阿尔夸塔德尔特龙托塔德尔特龙托地区（马尔凯地区，意大利中部）的局部地震响应的实验和数值评估，该地区在2016年8月24日发生了6.0级地震。Arquata主要村庄位于亚平宁山脉中部冲断带的细长WNW-ESE走向山脊上（意大利中部），海拔约170米，高于下面的冲积山谷，博尔戈和圣弗朗西斯科村庄建在那里。（小于500米），阿尔夸塔德尔特龙托塔德尔特龙托，博尔戈和圣弗朗西斯科报告了2016年8月主震后不同的破坏分布，表明该地区的地震反应可能受场地效应控制。为了探索这一假设，我们评估了二维数值局部地震响应沿着四个代表性的地质横截面通过阿尔夸塔德尔特龙托，圣弗朗西斯科和博尔戈。在沿着横截面的战略点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。数值放大函数在线性范围内和实验放大函数的广义反演技术（GIT）应用于大量的余震之间的令人满意的协议证实了大量的可靠性的底土模型。对2016年主震进行了代表性的数值分析，并根据峰值和关键地面运动参数进行了处理。最后，与2016年主震造成的损害进行了比较，基本上证明了观察到的模式。这项研究提供了一般性的影响，场地响应和地震小区划的特点是类似的复杂的地质和形态设置的网站。
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.