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首页> 外文期刊>Bulletin of earthquake engineering >Local variability of the ground shaking during the 2009 L'Aquila earthquake (April 6, 2009-Mw 6.3): the case study of Onna and Monticchio villages
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Local variability of the ground shaking during the 2009 L'Aquila earthquake (April 6, 2009-Mw 6.3): the case study of Onna and Monticchio villages

机译：2009年拉奎拉地震（2009年4月6日-兆瓦6.3）期间地面震动的局部变化：以恩纳和蒙蒂基奥村为例

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The 2009 Mw 6.3 L'Aquila event caused extensive damage in the city of L'Aquila and in some small towns in its vicinity. The most severe damage was recognized SE of L'Aquila town along the Aterno river valley. Although building vulnerability and near-source effects are strongly responsible for the high level of destruction, site effects have been invoked to explain the damage heterogeneities and the similarities between the 2009 macroseismic field with the intensities of historical earthquakes. The small village of Onna is settled on quaternary alluvium and suffered during the L'Aquila event an extremely heavy damage in the masonry structures with intensity IX-X on the Mercalli-Cancani-Sieberg (MCS) scale. The village of Monticchio, far less than 1.3 km from Onna, is mostly situated on Mesozoic limestone and suffered a smaller level of damaging (VI MCS). In the present paper, we analyze the aftershock recordings at seismic stations deployed in a small area of the middle-Aterno valley including Onna and Monticchio. The aim is to investigate local amplification effects caused by the near-surface geology. Because the seismological stations are close together, vulnerability and near-source effects are assumed to be constant. The waveform analysis shows that the ground motion at Onna is systematically characterized by large high-frequency content. The frequency resonance is varying from 2 to 3 Hz and it is related to alluvial sediments with a thickness of about 40 m that overlay a stiffer Pleistocene substrate. The ground motion recordings of Onna are well reproduced by the predictive equation for the Italian territory.
机译：2009年Mw 6.3拉奎拉大赛对拉奎拉市及其附近的一些小镇造成了严重破坏。破坏最严重的地区是Aterno河谷沿岸的L'Aquila镇。尽管建筑物的脆弱性和近源效应是造成高水平破坏的主要原因，但现场效应被用来解释破坏的异质性以及2009年大地震场与历史地震烈度之间的相似性。恩纳（Onna）小村庄定居在第四纪冲积层上，在拉奎拉（L'Aquila）事件期间，在Mercalli-Cancani-Sieberg（MCS）等级上，强度为IX-X的砖石结构遭受了极为严重的破坏。 Monticchio村距离Onna不到1.3公里，大部分位于中生代石灰岩上，遭受的破坏程度较小（VI MCS）。在本文中，我们分析了在包括恩纳和蒙蒂基奥在内的中阿特诺河谷小区域部署的地震台站的余震记录。目的是研究由近地表地质引起的局部放大效应。由于地震台站很靠近，因此假定脆弱性和近源效应是恒定的。波形分析表明，恩纳的地震动系统地具有高频率成分。共振频率从2赫兹到3赫兹不等，它与厚度约为40 m的冲积沉积物有关，这些沉积物覆盖了较硬的更新世基底。恩纳的地面运动记录可以通过意大利领土的预测公式很好地再现。

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