Use of Geotechnical and Geographical Information Systems to Analyze Seismic Risk in Algiers Area / Utilisation des systèmes d'information géotechnique et géographique pour analyser le risque sismique dans la zone d’Alger

Mohammed Amin Benbouras, Ratiba Mitiche Kettab, Fatiha Debiche, Maroua Lagaguine, Abdelmounaim Mechaala, Chawki Bourezak, Alexandru-Ionuţ Petrişor

Rezumat/Abstract. Geotechnical and geophysical data acquired from in situ and laboratory tests are crucial for safer constructions and better foundation plans. Accordingly, the geotechnical engineer assumes the responsibility to thoroughly study the site, in order to provide timely and cost-effectively the necessary and sufficient information on the natural features of the site, by predicting the different potential hazards. On the other hand, processing geotechnical and seismic information integrated by geographic information systems is an excellent idea that could help geotechnical engineers reliably predicting geotechnical information and accurately estimating the effects of the site in Alger area. This study represents a scientific contribution aimed at processing a geotechnical database of 144 downhole test surveys. This database is collected and organized in the geotechnical Information system "Géo-Base", which is then integrated into the Geographic Information System software (ArcGIS in the present study), allowing for visualizing the geotechnical maps. Finally, the seismic microzoning maps were constructed using the site period and average shear wave velocity up to 30 m (VS30). These maps were presented as a regional strategy. They will also be very useful for engineers, researchers and builders in future studies to mitigate seismic hazards in the study area by helping them making better decisions and safer and more economical designs.

Cuvinte cheie/Key words: seismic hazards; geographic information systems; downhole tests; microzoning carts; shear wave velocity

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