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DOI | 10.1007/s11069-020-04298-w |
Modelling and assessment of earthquake ground response in areas characterised by a thick buried low-velocity layer | |
Farrugia D.; Galea P.; D’Amico S. | |
发表日期 | 2021 |
ISSN | 0921030X |
起始页码 | 115 |
结束页码 | 136 |
卷号 | 105期号:1 |
英文摘要 | It is known that local geology can alter the ground motion characteristics at a particular site. Whereas some sites are characterised by outcropping low-velocity layers, others might have buried ones of considerable thickness which might still be a cause of ground motion amplification. The Maltese islands (Central Mediterranean) provide a good case study for profiles with a buried low-velocity layer. Parts of the islands are characterised by Upper Coralline Limestone covering a soft Blue Clay layer of considerable thickness (up to 75 m). This gives rise to a velocity inversion and makes the travel-time average shear-wave velocity (VS) in the upper 30 m not suitable for seismic microzonation purposes. This study presents a comprehensive site response analysis for such areas. Previously obtained shear-wave velocity (VS) profiles were used as an input to the equivalent linear programme SHAKE2000. Maps of amplification factors and 5% damped elastic response spectra confirm that the clay, even when buried under a hard outcropping layer, can still produce significant amplifications at frequencies which are of engineering interest when considering the recent urbanisation patterns. Moreover, the suitability of the VS30 and the travel-time average shear-wave velocity till bedrock parameters as proxies for site response was investigated, with the results highlighting the inadequacy of these parameters for sites characterised by buried low-velocity layers and the necessity for site-specific response studies. © 2020, Springer Nature B.V. |
关键词 | Low-velocity layersite classificationSite responseValidity of VS30 |
英文关键词 | earthquake event; ground motion; hazard assessment; modeling; seismic response; seismic velocity; seismic zone; site characterization; Malta [Southern Europe] |
语种 | 英语 |
来源期刊 | Natural Hazards
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/206218 |
作者单位 | Department of Geosciences, University of Malta, Msida, Malta |
推荐引用方式 GB/T 7714 | Farrugia D.,Galea P.,D’Amico S.. Modelling and assessment of earthquake ground response in areas characterised by a thick buried low-velocity layer[J],2021,105(1). |
APA | Farrugia D.,Galea P.,&D’Amico S..(2021).Modelling and assessment of earthquake ground response in areas characterised by a thick buried low-velocity layer.Natural Hazards,105(1). |
MLA | Farrugia D.,et al."Modelling and assessment of earthquake ground response in areas characterised by a thick buried low-velocity layer".Natural Hazards 105.1(2021). |
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