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Nanozonation in dense cities : testing a combined methodology in Barcelona City (Spain)
Salinas Naval, Víctor; Caselles Magallón, Josep Oriol; Pérez Gracia, María de la Vega; Santos Assunçao, Sonia; Clapes Boixader, Jaime; Pujades Beneit, Lluís; González Drigo, José Ramón; Canas Torres, José Antonio; Martínez Sánchez, Joan
Universitat Politècnica de Catalunya. Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica; Universitat Politècnica de Catalunya. Departament de Resistència dels Materials i Estructures en Enginyeria; Universitat Politècnica de Catalunya. Departament d'Organització d'Empreses; Universitat Politècnica de Catalunya. GIES - Geofísica i Enginyeria Sísmica
Microzonation is widely used in seismic risk evaluations to define the predominant period values, which are usually associated with extended areas of a few hundred meters. However, the representative values corresponding to these areas are obtained from few measurements in each area. Thereby, results are accurate only in the case of depth-dependent soils. However, not detected narrow and sharp lateral changes in soil are potentially the cause of imprecision and could be a source of specific errors. This article aims to present several tests conducted in order to emphasise the importance of accurate selection of points, to underscore the necessity of more precise and detailed evaluations, and to suggest a possible methodology to select the most appropriate data acquisition points. Results highlight the need to divide microzonation areas into smaller zones for a precise evaluation in locations where sudden changes in soil characteristics exist. Therefore, in such sites the requirement of nanozonation appears; defining zones with the same soil response. Distance between vibration measurements could be the main problem for nanozonation; data acquisition in areas with irregular geology can be time consuming when a precise analysis is required. In the most complicated environments or in dense cities, it could even be unfeasible. Consequently, it is necessary to establish a functional methodology to adequately distribute the measurement points throughout the area. On this occasion, three sites in Barcelona city were studied. This city is surrounded by mountains at NW, W, and S, and by the Mediterranean Sea at N and E. As a consequence, the shallow geology is characterized by many paleochannels and streams that are currently buried. These geological structures most likely affect the soil response maps, including nanozonation.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria civil::Geomàtica::Cartografia
Àrees temàtiques de la UPC::Enginyeria civil::Geologia
Ground penetrating radar
Ground-Penetrating Radar
H/V
Microzonation
Nanozonation
Shallow Geology
Soil Response
Georadar
info:eu-repo/semantics/submittedVersion
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