Ground-Motion Hazard Values for Northern Algeria |
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| Authors: | M Hamdache J A Peláez A Talbi M Mobarki C López Casado |
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| Institution: | (1) D?partment d’?tudes et Surveillance Sismique, Centre de Recherche en Astronomie, Astrophysique et de G?ophysique, B.P. 63, Bouzar?ah, 16340 Algiers, Algeria;(2) Department of Physics, University of Ja?n, Ja?n, Spain;(3) Department of Theoretical Physics, University of Granada, Granada, Spain |
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| Abstract: | This study examines distinctive features of ground motion parameters in northern Algeria. An initial computation of seismic
hazard in terms of horizontal peak ground acceleration (PGA) and spectral acceleration (SA) at different periods, damped at
5%, is carried out for three different types of soils (rock, stiff soils and soft soils) for return periods of 100 and 475 years.
In addition, uniform hazard spectra (UHS) are computed for these two return periods at several locations in the region. Then,
the UHS computed for different soil types are proposed as a starting point to define elastic design spectra for building-code
purposes. We have used the well-known Newmark-Hall approach. As proposed in the most recent International Building Codes,
the SA (0.2 s) value is used to establish the spectral region for lower periods (region controlled by acceleration), whereas
the SA (1.0 s) value is used to establish the spectral region for intermediate periods (region controlled by velocity). We
also obtained important relations, dependent on site condition, between SA (0.2 s), SA (1.0 s) or SAmax values, and the PGA, for both return periods of 100 and 475 years. Other relationships between PGA or SAmax values have also been derived for return periods of 100 and 475 years, in this case independent of site condition. |
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