Estimation of Seismic Hazard Parameters in the Northern Part of Algeria

Hamdache, Mohamed; Bezzeghoud, Mourad; Mokrane, A.

doi:10.1007/s000240050107

Cited by 19 publications

(15 citation statements)

References 13 publications

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“…The computed b values are totally in agreement with those previously obtained by several authors (e.g., Lo´PEZ CASADO et al, 1995;HAMDACHE et al, 1998;AOUDIA et al, 2000). The changes in m max values are only evident in seismic sources Sa3 and Sa5 (Fig.…”

Section: Methodssupporting

confidence: 82%

Updating the Probabilistic Seismic Hazard Values of Northern Algeria with the 21 May 2003 M 6.8 Algiers Earthquake Included

Peláez

Hamdache

Casado

2005

Pure appl. geophys.

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The occurrence of the Algiers earthquake (M 6.8) of May 21, 2003, has motivated the necessity to reassess the probabilistic seismic hazard of northern Algeria. The fact that this destructive earthquake took place in an area where there was no evidence of previous significant earthquakes, neither instrumental nor historical, strongly encourages us to review the seismic hazard map of this region.Recently, the probabilistic seismic hazard of northern Algeria was computed using the spatially smoothed seismicity methodology. The catalog used in the previous computation was updated for this review, and not only includes information until June 2003, but also considers a recent re-evaluation of several historical earthquakes. In this paper, the same methodology and seismicity models are utilized in an effort to compare this methodology against an improved and updated seismic catalog.The largest mean peak ground acceleration (PGA) values are obtained in northernmost Algeria, specifically in the central area of the Tell Atlas. These values are of the order of 0.48g for a return period of 475 years. In the City of Algiers, the capital of Algeria, and approximately 50 km from the reported epicenter of this latest destructive earthquake, a new mean PGA value of 0.23 g is obtained for the same return period. This value is 0.07g greater than that obtained in the previous computation. In general, we receive greater seismic hazard results in the surrounding area of Algiers, especially to the southwest. The main reason is not this recent earthquake by itself, but the significant increase in the m max magnitude in the seismic source where the city and the epicenter are included.

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Section: Methodssupporting

confidence: 82%

Updating the Probabilistic Seismic Hazard Values of Northern Algeria with the 21 May 2003 M 6.8 Algiers Earthquake Included

Peláez

Hamdache

Casado

2005

Pure appl. geophys.

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“…In this study, seismogenic sources were defined as areas with seismic characteristics as homogeneous as possible, including a certain inference among seismicity and geological domains. Based on the work by AOUDIA et al (2000), some modifications were included in the seismogenic sources previously proposed (HAMDACHE, 1998;HAMDACHE et al, 1998;HAMDACHE and RETIEF, 2001) for northern Algeria. The geological description given in AOUDIA et al (2000) can be used to incorporate the geological knowledge in the seismogenic sources considered in this study.…”

Section: Methodology Outlinementioning

confidence: 99%

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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“…This equation has subsequently been used for the estimation of the maximum possible earthquake magnitude in several seismically active areas such as China (YURUI and TIANZHONG, 1997); Canada (WEICHERT and KIJKO, 1989); Iran (MOTAZEDIAN et al, 1997); India (SHANKER, 1998); Romania (MARZA et al, 1991); Greece (PAPADOPOULOS and KIJKO, 1991); Algeria (HAMDACHE, 1998;HAMDACHE et al, 1998); Italy (SLEJKO and KIJKO, 1991); Spain (GARCIA-FERNANDEZ et al, 1989), Turkey (APTEKIN and ONCEL, 1992;APTEKIN et al, 1992) and the West Indies (ASPINALL et al, 1994). The value of m max obtained from the solution of equation (8) will be termed the Kijko-Sellevoll estimator of m max , or, in short, K-S.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the Maximum Earthquake Magnitude, m max

Kijko

2004

Pure and Applied Geophysics

357

192

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This paper provides a generic equation for the evaluation of the maximum earthquake magnitude m max for a given seismogenic zone or entire region. The equation is capable of generating solutions in different forms, depending on the assumptions of the statistical distribution model and/or the available information regarding past seismicity. It includes the cases (i) when earthquake magnitudes are distributed according to the doubly-truncated Gutenberg-Richter relation, (ii) when the empirical magnitude distribution deviates moderately from the Gutenberg-Richter relation, and (iii) when no specific type of magnitude distribution is assumed. Both synthetic, Monte-Carlo simulated seismic event catalogues, and actual data from Southern California, are used to demonstrate the procedures given for the evaluation of m max .The three estimates of m max for Southern California, obtained by the three procedures mentioned above, are respectively: 8.32 ± 0.43, 8.31 ± 0.42 and 8.34 ± 0.45. All three estimates are nearly identical, although higher than the value 7.99 obtained by FIELD et al. (1999). In general, since the third procedure is non-parametric and does not require specification of the functional form of the magnitude distribution, its estimate of the maximum earthquake magnitude m max is considered more reliable than the other two which are based on the Gutenberg-Richter relation.

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Estimation of Seismic Hazard Parameters in the Northern Part of Algeria

Cited by 19 publications

References 13 publications

Updating the Probabilistic Seismic Hazard Values of Northern Algeria with the 21 May 2003 M 6.8 Algiers Earthquake Included

Updating the Probabilistic Seismic Hazard Values of Northern Algeria with the 21 May 2003 M 6.8 Algiers Earthquake Included

Ground-Motion Hazard Values for Northern Algeria

Estimation of the Maximum Earthquake Magnitude, m max

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