Evaluation of seismic hazard at the northwestern part of Egypt

Ezzelarab, Mohamed; Shokry, M.M.F.; Mohamed, Abbas Ahmed; Helal, A.M.A.; El-Hadidy, Mahmoud

doi:10.1016/j.jafrearsci.2015.10.017

Cited by 19 publications

(6 citation statements)

References 28 publications

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“…About 80% of all SHA studies conducted until now about Egypt at different geographic scales are based on the traditional PSHA and despite of the presence of theoretical and practical limitations and poor performance of these approaches, as demonstrated by Panza et al (2014) and references therein, it is still in use in the construction of newly developed SHA maps at different scales (e.g. EzzElarab et al, 2016;Sawires et al, 2016b) upon which the current Egyptian Building Code is dangerously based. The different studies adopting the traditional PSHA method contribute to the development of the collection and revision of input data rather than to the critical revision and improvement of the methodology, elements that are crucially necessary to reach a reliable, as much as possible, estimate of hazard (Tables 1-3).…”

Section: Seismic Hazard Studies For Egyptmentioning

confidence: 99%

“…Most of the available SHA studies for Egypt (e.g. Ibrahim and Hattori, 1982;Abdel-Fattah, 2005;Mohamed et al, 2012;EzzElarab et al, 2016) have reduced the seismic hazard assessment to one or two value(s), i.e. peak ground acceleration (PGA) for the horizontal component (poorly correlated to damage) and response spectrum (RS) at different periods rather than the complete frequency content, effective acceleration, bracketed duration, incremental velocity and damaging potential (e.g.…”

Section: Seismic Hazard Studies For Egyptmentioning

confidence: 99%

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Insight on seismic hazard studies for Egypt

Hassan

Panza

Romanelli³

et al. 2017

Engineering Geology

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Section: Seismic Hazard Studies For Egyptmentioning

confidence: 99%

Section: Seismic Hazard Studies For Egyptmentioning

confidence: 99%

Insight on seismic hazard studies for Egypt

Hassan

Panza

Romanelli³

et al. 2017

Engineering Geology

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“…Acceleration time histories are generated using the spectral matching technique in time domain (for more details see Ezzelarab, 2015). The Pacific Earthquake Engineering Research Center (PEER) (http://ngawest2.berkeley.edu) database is searched according to the defined earthquakes scenario (distance and magnitude) that has the largest contribution to the seismic hazard from the de-aggregation of probabilistic seismic assessment (PSHA) results for 475 years return period by Ezzelarab (2015). This scenario was a result of near-field seismic sources at distances 30-56 (km) with 5.3 Mw.…”

Section: Site Response Analysesmentioning

confidence: 99%

Effects of surface geology on the ground-motion at New Borg El-Arab City, Alexandria, Northern Egypt

Helal

Mohamed

Shokry

et al. 2016

NRIAG Journal of Astronomy and Geophysics

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The effects of the near-surface geology on the ground-motion at New Borg El-Arab City were evaluated in the current work based on the analysis of the ambient noise records (microtremor). Sixty-nine microtremor measurements have been done in the studied area. The dataset was processed using horizontal-to-vertical-spectral ratio (HVSR) technique to estimate the fundamental frequencies corresponding to the ground-motion amplification due to the soil deposits. By spatial interpolation of the resulted fundamental frequencies (f 0) of all the measured sites, the zonation map was produced. This map was correlated with the geological features of the study area and demonstrated that the fundamental frequency ranges between 5.8 Hz and 7 Hz were corresponding to the sites located over Quaternary deposit. However, the fundamental frequencies (f 0) increased in the middle of the study area due to presence of parallel Alexandria limestone ridge. Finally, site effect was highlighted by performing a site response analysis. It indicated that, the PGA at surface of the analyzed site is 0.047 g and the maximum spectral acceleration (SA) is 0.157 g. It was also found that, the maximum spectral period from site response analysis is in a good agreement with that one from HVSR technique. This confirmed the robustness of HVSR for determination of fundamental period or frequency.

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“…Ayele [4] presented a seismic hazard map, which has been implemented in the 3 rd generation building code of Ethiopia. Ezzelarab [5], having adopting the probabilistic approach, evaluated the seismic hazard of north-western part of Egypt. Gaspar-Escribano [6] conducted an uncertainty assessment of developed seismic hazard model for Spain.…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo Based Seismic Hazard Model for Southern Ghana

et al. 2018

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Seismic hazard assessment involves quantifying the likely ground motion intensities to be expected at a particular site or region. It is a crucial aspect of any seismic hazard mitigation program. The conventional probabilistic seismic hazard assessment is highly reliant on the past seismic activities in a particular region. However, for regions with lower rates of seismicity, where seismological data is scanty, it would seem desirable to use a stochastic modelling (Monte Carlo based) approach. This study presents a Monte Carlo simulation hazard model for Southern Ghana. Six sites are selected in order to determine their expected ground motion intensities (peak ground acceleration and spectral acceleration). Results revealed that Accra and Tema as the highly seismic cities in Southern Ghana, with Ho and Cape Coast having relatively lower seismicities. The expected peak ground acceleration corresponding to a 10% probability of exceedance in 50 years for the proposed seismic hazard model was as high as 0.06 g for the cities considered. However, at the rather extreme 2% probability of exceedance in 50 years, a PGA of 0.5 g can be anticipated. Evidently, the 2% in 50 years uniform hazard spectrum for the highly seismic cities recorded high spectral accelerations, at a natural vibrational period within the ranges of about 0.1-0.3 sec. This indicates that low-rise structures in these cities may be exposed to high seismic risk.

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Evaluation of seismic hazard at the northwestern part of Egypt

Cited by 19 publications

References 28 publications

Insight on seismic hazard studies for Egypt

Insight on seismic hazard studies for Egypt

Effects of surface geology on the ground-motion at New Borg El-Arab City, Alexandria, Northern Egypt

Monte Carlo Based Seismic Hazard Model for Southern Ghana

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