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Seismic site characterisation of Red Soil and soil-building resonance effects in L’Aquila downtown (Central Italy)
Bulletin of Engineering Geology and the Environment ( IF 4.2 ) Pub Date : 2020-05-12 , DOI: 10.1007/s10064-020-01795-x
Marco Tallini , Lorenzo Lo Sardo , Marco Spadi

We present a fine-scale shallow geological setting and its possible influence on the seismic building behaviour of L’Aquila downtown which suffered many casualties and building damage caused by the 6 April 2009, Mw 6.1 earthquake. This study draws mainly on the integration of 666 borehole logs and 274 microtremor recordings interpolated with GIS-based techniques. The shallow geology of L’Aquila downtown is characterised by Middle Pleistocene calcareous L’Aquila breccias. Their top surface consists of a weathered epikarst zone that is mantled by Red Soil (reddish colluviated Alfisols) formed during the late Pleistocene. The areal distribution and thickness of Red Soil are causative of the medium microtremor frequency (3–13 Hz). The map of cross-correlation between the medium frequencies, estimated through the empirical Eurocode 8 equation, shows buildings with possible seismic coupling due to the shallow geology setting and the fundamental building period. This technique is further supported by the areal distribution of seismic building damages caused by the 2009 and 1703 L’Aquila earthquakes. This approach, carried out with a large geological and geophysical dataset, is useful in defining seismic site effects and may be effective in mitigating the seismic risk of cities with notable historical heritage in Central Italy, such as the L’Aquila downtown area.



中文翻译:

拉奎拉市中心(意大利中部)的红壤地震现场特征和土石建筑共振效应

我们提供了一个精细的浅层地质环境及其对拉奎拉市中心抗震建筑性能的影响,拉奎拉市区遭受了许多人员伤亡和建筑物损坏,2009年4月6日,M w6.1级地震。这项研究主要利用基于GIS的技术对666个钻孔测井和274个微震记录进行整合。拉奎拉市中心的浅层地质特征是中更新世的石灰质拉奎拉角砾岩。它们的上表面由风化的岩溶岩带组成,该岩溶带被更新世晚期形成的红壤(带红色带状的Alfisol)覆盖。红壤的面积分布和厚度是中等微震频率(3-13 Hz)的原因。通过经验欧洲规范8方程估算的中频之间的互相关图显示,由于浅层地质环境和基本建筑周期,建筑物可能发生地震耦合。由2009年和1703年拉奎拉地震造成的地震建筑破坏的区域分布进一步支持了此技术。这种方法是在庞大的地质和地球物理数据集上执行的,有助于定义地震现场的影响,并且对于减轻意大利中部具有重要历史遗产的城市(例如拉奎拉市中心地区)的地震风险可能是有效的。

更新日期:2020-05-12
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