Journal
PURE AND APPLIED GEOPHYSICS
Volume 169, Issue 4, Pages 711-723Publisher
SPRINGER BASEL AG
DOI: 10.1007/s00024-011-0333-z
Keywords
Seismic hazard; uniform hazard spectra; elastic design spectra; spectral acceleration; peak ground acceleration
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Funding
- Algerian C.R.A.A.G.
- Spanish Seismic Hazard and Active Tectonics research group
- Grants-in-Aid for Scientific Research [10F00333] Funding Source: KAKEN
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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 SA(max) values, and the PGA, for both return periods of 100 and 475 years. Other relationships between PGA or SA(max) values have also been derived for return periods of 100 and 475 years, in this case independent of site condition.
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