Seismic Hazard in Terms of Spectral Accelerations and Uniform Hazard Spectra in Northern Algeria

Peláez, José A.; Hamdache, Mohamed; Casado, Carlos López

doi:10.1007/s00024-005-0011-0

Cited by 26 publications

(11 citation statements)

References 30 publications

(20 reference statements)

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“…In PELÁ EZ et al (2005EZ et al ( , 2006, seismic hazard values in terms of PGA and SA at different periods for rock, damped at 5%, and for return periods of 100 and 475 years, were computed and displayed. …”

Section: Methodology Outlinementioning

confidence: 99%

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Ground-Motion Hazard Values for Northern Algeria

Hamdache

Peláez

Talbi

et al. 2011

Pure Appl. Geophys.

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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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Section: Methodology Outlinementioning

confidence: 99%

“…In both cases, an evident linear relationship can be observed. These two relationships were inferred, using less data and only results for rock, in PELÁ EZ et al (2006). Table 2 shows estimates for the slope and its standard error for the two fits.…”

Section: Ground Motion Parameter Relationshipsmentioning

confidence: 99%

Ground-Motion Hazard Values for Northern Algeria

Hamdache

Peláez

Talbi

et al. 2011

Pure Appl. Geophys.

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“…Different zoning models were initially considered for the study region, including those of Martín (1983); Muñoz (1983); IPEEE (1993); López Casado et al (1995); Molina (1998), the model defined for the Global Seismic Hazard Assessment Project (GSHAP), Bouhadad and Laouami (2002), the model in which the hazard map of the Spanish seismic Building Code is based (NCSE-02), Peláez et al (2006); Hamdache (1998) and Aoudia et al (2000).…”

Section: Selection Of Seismic Zoningsmentioning

confidence: 99%

“…The north of Africa Zoning models were chosen after a revision of the specialized literature, finally considering the zoning proposed Hamdache (1998) supplemented by data of Peláez et al (2006) (HAM98) and the zoning proposed by Aoudia et al (2000) (AOU00). Both models seem quite reliable, and they are the most complete and best explained for northern Africa on the basis of the information taken into account for the definition of boundaries and estimation of seismic parameters.…”

Section: Selection Of Seismic Zoningsmentioning

confidence: 99%

A new seismic hazard assessment in the region of Andalusia (Southern Spain)

Benito

Navarro

Vidal

et al. 2010

Bull Earthquake Eng

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A probabilistic seismic hazard assessment of Andalusia (Southern Spain) in terms of peak ground acceleration, PGA, and spectral accelerations, SA(T), is presented in this paper. In contrast to most of the previous studies in the region, which were performed for PGA, making use of Intensity-to-PGA relationships, hazard was here calculated in terms of magnitude, using published spectral ground-motion models. Moreover, we considered different ground-motion models for the Atlantic sources, since the attenuation of those motions seems to be slower, as evidenced in the case of the extensive macroseismic areas of earthquakes like those occurred in the years 1755, 1969 and 2007. A comprehensive review of the seismic catalogue and of the seismogenic models proposed for the region was carried out, including those for Northern Africa, which is part of the influence area. Hazard calculations were performed following the Probabilistic Seismic Hazard Assessment (PSHA) methodology using a logic tree, which accounts for six different seismic source zonings and five different ground-motion attenuation relationships. Hazard maps in terms of PGA and SA (0.2 s) and SA (1 s) and coefficient of variation (COV) maps, for the 475-year return period were first obtained in rock sites. A geotechnical classification and amplification factors were proposed and new hazard maps including local effects were represented, showing PGA values ranging from 24 to 370 cm/s 2 for the whole Andalusian territory, with the highest expected values (PGA > 300 cm/s 2 ) in some parts of the Granada Province and in the town of Vélez Málaga. Lowest values (PGA < 50 cm/s 2 ) correspond to some towns of the Huelva 123 740 Bull Earthquake Eng (2010) 8: and Córdoba provinces. The inclusion of soil effects provides a more detailed picture of the actual hazard the region is subjected to.

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“…4 (Peláez et al 2006). Based on seismogenic studies and ground motion models defined by Meghraoui et al (1988), Boudiaf (1996) and Geomatrix (2006), Ait Meziane (2012) developed a standard PSHA for rock site conditions with focus on the historical site of the Casbah in Algiers (reference coordinate 3.05E-36.78N).…”

Section: Seismic Hazardmentioning

confidence: 99%

A procedure for the identification of the seismic vulnerability at territorial scale. Application to the Casbah of Algiers

Novelli

D’Ayala

Makhloufi

et al. 2014

Bull Earthquake Eng

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One of the objectives of the PERPETUATE EU-FP7 project was to determine a sound approach to the quantification of the seismic vulnerability of historic centres at territorial scale. The procedure presented herein provides a ten steps guideline from how to select building samples in the area of study, to how to compute the buildings' seismic performance and finally how to evaluate rehabilitation decisions to reduce the seismic fragility of the studied typologies over an entire district or city. The procedure is illustrated in this paper by way of application to The Casbah of Algiers, a world heritage site composed of building clusters from the Ottoman to the French period. Pre-existing seismic damage, decay due to lack of maintenance and environmental factor and a urban irregular and complex lay-out make this application particularly challenging. (2015) 13:177-202 Evaluation), a mechanical approach based on limit state analysis and kinematics, which allows computing collapse load factor, deriving capacity curves and determining fragility functions. As the approach identifies also the collapse mechanisms, it provides a base for choosing and evaluating the effects of strengthening interventions, which are rolled out at territorial level to improve the seismic performance of the whole sample. The effectiveness of the present procedure for the identification of the seismic vulnerability at territorial scale is discussed in the conclusions.123 178 Bull Earthquake Eng

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Seismic Hazard in Terms of Spectral Accelerations and Uniform Hazard Spectra in Northern Algeria

Cited by 26 publications

References 30 publications

Ground-Motion Hazard Values for Northern Algeria

Ground-Motion Hazard Values for Northern Algeria

A new seismic hazard assessment in the region of Andalusia (Southern Spain)

A procedure for the identification of the seismic vulnerability at territorial scale. Application to the Casbah of Algiers

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