Nonlinear Deterministic Study of Seismic Microzoning of a City in North of Algeria

Badreddine Bousbia,Badreddine Sbartai

doi:10.28991/cej-2019-03091370

Badreddine Bousbia, Badreddine Sbartai

Open Access

https://doi.org/10.28991/cej-2019-03091370

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Abstract

This paper presents also an overview of seismic microzonation studies of the city of Mohammadia-Algiers, which are important for a detailed ground movement modeling of urban cities. According to the seismic history of the city, one extraordinary earthquake event has been taken into consideration is Boumerdes earthquake (Algeria, May 21, 2003, magnitude Mw=6.5), that caused a huge damage. Thereby, the variability prediction of the seismic ground movement in a given built-up area, it is considered as an effective tool for planning appropriate urban development and understanding both seismic risk and damage pattern, caused by a strong movement event. We note that the shaking level is mainly described in terms of both maximum ground acceleration and visualized amplification by using response spectra. The study is carried out in two steps: - a detailed mapping of the geology and geotechnical properties of the area - numerical modeling of expected ground motions during earthquakes. A qualitative microzonation of the Mohammadia-Algiers city is presented, and it is discussed by comparing it to the historically reported damage of the 2003 Boumerdes earthquake. Finally, this study deals with the seismic microzonation map development, based on a SIG geological model.

Highlights

The town of Mohammadia city is located in the heart of Algiers, about 10 km to the east
The soils recognition and their response allow the identification of typical behaviors and the adaptation of the structures design spectra, which are imposed by the seismic regulations, in order to take into account the site effects [3738]
The microzonation map of the 52 boreholes located in Mohammadia city has been done, taking into account the ground shaking

Summary

Introduction

The town of Mohammadia city is located in the heart of Algiers, about 10 km to the east. It is bounded, on the west, by Oued El Harrach, on the north, by the sea, on the south, by the national road (NR.5) and, on the east, by the municipalities of Bordj El Kiffan and Bab Ezzouar. It is located according to the following geodetic coordinates 36° 44' 00" North 3° 08' 00" East (Figure 1). This zone is known by its great seismic activity due to the approximation of the Eurasia and Africa tectonic plates.

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