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首页> 外文期刊>Bulletin of earthquake engineering >Local site effect microzonation of Lorca town (SE Spain)
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Local site effect microzonation of Lorca town (SE Spain)

机译：洛尔卡镇（西班牙东南部）的局部场效应微区

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摘要

Local site effect assessment based on subsurface ground conditions is often the key to evaluate urban seismic hazard. The site effect evaluation in Lorca town (south-eastern Spain) started with a classification of urban geology through the geological mapping at scale 1:10,000 and the use of geotechnical data and geophysical surveys. The 17 geological formations identified were classified into 5 geological/seismic formations according to their seismic amplification capacity obtained from ambient vibration measurements as well as from simultaneous strong motion records. The shear-wave velocity structure of each geological/ seismic formation was evaluated by means of inversion of Rayleigh wave dispersion data obtained from vertical-component array records of ambient noise. Nakamura's method was applied to determine a predominant period distribution map. The spectral amplification factors were fourfold the values recorded in a reference hard-rock site. Finally, the capability of this study for explaining the damage distribution caused by the May 11th, 2011 Lorca destructive earthquake (Mw = 5.2) was examined. The methods used in this work are of assistance to evaluate ground amplification phenomena in urban areas of complex geology as Lorca town due to future earthquakes with applicability on urban seismic risk management.
机译：基于地下地面条件的局部场地效应评估通常是评估城市地震灾害的关键。洛尔卡镇（西班牙东南部）的现场效果评估首先通过对城市地质进行分类，方法是按1：10,000比例尺进行地质制图，并利用岩土数据和地球物理勘测技术。根据从环境振动测量以及同时进行的强运动记录中获得的地震放大能力，识别出的17个地质构造被分为5个地质/地震构造。通过反演从环境噪声的垂直分量阵列记录中获得的瑞利波频散数据，对每个地质/地震构造的剪切波速度结构进行了评估。应用Nakamura的方法确定主要的时期分布图。光谱放大因子是参考硬岩场地记录值的四倍。最后，检验了这项研究解释2011年5月11日洛尔卡破坏性地震（Mw = 5.2）造成的破坏分布的能力。这项工作中使用的方法有助于评估由于未来地震而在洛卡镇等地质复杂的城市地区的地面放大现象，并适用于城市地震风险管理。

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