气候变化领域集成服务门户(CCPortal): Modelling and assessment of earthquake ground response in areas characterised by a thick buried low-velocity layer

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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 layer site classification Site response Validity 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
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).