DOI: 10.1007/s11069-020-04298-w
论文题名: Modelling and assessment of earthquake ground response in areas characterised by a thick buried low-velocity layer
作者: Farrugia D. ; Galea P. ; D’Amico S.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2021
卷: 105, 期: 1 起始页码: 115
结束页码: 136
语种: 英语
中文关键词: 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]
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169017
Appears in Collections: 气候变化与战略
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作者单位: Department of Geosciences, University of Malta, Msida, Malta
Recommended Citation:
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]. Natural Hazards,2021-01-01,105(1)