Fig 8 - uploaded by George D. Bouckovalas
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Geological map with altitude contours and location of GIS-located borehole locations in Ano Liossia municipality, Greece.
Source publication
GIS-aided seismic microzonation necessitates simple yet accurate means for estimating soil effects on seismic ground motion. Currently available means are either too simplistic for engineering purposes (empirical relations) or too complicated to be implemented as an add-in to a GIS environment (numerical algorithms). This paper presents a set of ap...
Contexts in source publication
Context 1
... a test case for the GIS application of the new relations, the area of Ano Liossia municipality was chosen, in the greater Athens area, which suffered severe structural damage in the 1999 Athens earthquake. As shown in Fig. 8 the area of interest has a mild slope to the north-west and is almost surrounded by outcropping rock formations, the limestones of Parnitha and Egaleo mountains to its north and south, respectively, and marly formations to its east. The soil in Ano Liossia is pleistocenic talus cones and in some locations sandy-clay sediments, ...
Context 2
... This was retrieved from HELGEORDAS [6], a relational geotechnical database management system prepared in MS ACCESS that contains geological profiling, insitu and laboratory data for over 2000 borehole locations in the greater Athens area. The GIS- based search located 12 boreholes in the densely populated part of Ano Liossia, also shown in Fig. ...
Citations
... Yet, this assumption enables a rough comparison of predicted seismic motion amplification with recorded structural damage during the foregoing earthquake, but also a detailed comparison with the results of the actual seismic microzonation study of the area that also used the Athens earthquake as one of the potential devastating seismic scenarios [14]. Some preliminary results from this application were presented in [22], but this section provided full details and the final form of this application following the 4-Step procedure presented earlier. ...
This paper presents an automated methodology for performing geographic information system (GIS)-aided seismic microzonation studies. It presupposes the existence of a geotechnical database containing data from sampling boreholes and in situ geotechnical or geophysical tests. The database has been related to a GIS that is being used only for graphically locating the available borehole and in situ test sites for the study area and for the compilation of digital contour maps. The processing of data and the seismic ground response analyses are automatically performed externally to the GIS and the geotechnical database, via a computer code (created in MS Visual Basic) whose flow chart and characteristics are described in detail herein. This code processes data from the geotechnical database (that has a relational structure and has been created in MS Access here), along with engineering geological and seismological information for the study area. Then, it proceeds in performing the seismic ground response analyses via recently proposed multi-variable relations that duplicate successfully the results of the 1D equivalent linear numerical method. As an application, the paper presents an exemplary GIS-aided seismic microzonation study for an urban municipality of the greater Athens (Greece) area, which reveals the efficiency of the automated methodology and explores its limitations.
