Ground motion prediction from nearest seismogenic zones in and around Greater Cairo Area, Egypt

el-aal, Abd el-aziz Khairy Abd

doi:10.5194/nhess-10-1495-2010

Cited by 37 publications

(5 citation statements)

References 29 publications

(24 reference statements)

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“…Consequently, a study on the seismic activity in Saqqara relevant to the Zoser pyramid has been carried out. Using the data reported in Reference 27 , the following map (Fig. 2 b) of the earthquakes that occurred in the effective seismogenic zone in and around the Cairo Area has been developed.…”

Section: Resultsmentioning

confidence: 99%

“…In absence of publicly available seismic records, the Boore method 28 is adopted to determine the power spectral density function of the ground acceleration at the bedrock, , as a function of the vector of random variables , the frequency as well as the time ; therefore, an evolutionary power spectral density with random parameters is established. In this paper, we generated the vector of random variables by means of the magnitude, , epicentral distance , stress drop , and angle of incidence ; these random parameters are defined by establishing their probability distribution functions from the seismological data given in literature 27 . An equirectangular approximation is used to determine the distances, , between the coordinates of the epicentres of the past earthquakes and the centre of the Zoser pyramid, as well as the incidence angle with respect to the determined E-W side of the pyramid.…”

Section: Resultsmentioning

confidence: 99%

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Exploring the performances of the vibrating barriers for the seismic protection of the Zoser pyramid

Cacciola

Shadlou

Ayoub

et al. 2022

Sci Rep

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In this paper we aim to investigate the use of the Vibrating Barrier (ViBa) as a potential strategy to mitigate the effects of the seismic action on the Zoser Pyramid. The Vibrating Barrier is a structure buried in the soil that is able to absorb a significant portion of the dynamic energy arising from the ground motion. The working principle exploits the dynamic interaction among vibrating structures resting on a compliant semi-infinite space, namely the structure–soil–structure interaction. A reliable numerical simulation of the Zoser Pyramid and the surrounding soil undergoing stochastic ground motion excitations representing the seismicity in Saqqara is presented. Due to the unique structural form, the ViBa is herein optimized through an ad-hoc procedure to minimize a response strain energy spectral density used as a synthetic performance parameter. Various layouts of the ViBa have been considered and presented in the paper. The efficiency of the ViBa is assessed by numerical simulation of the finite element model of the ViBa-Soil-Pyramid system and by laboratory testing. Results from a pertinent Monte Carlo study show an evident reduction of the stresses in the Pyramid manifesting the feasibility of this novel strategy to protect historic structures from earthquake-induced ground motion. Experimental results on a 1:500 gelatine model of the pyramid and the surrounding area highlighted the efficiency and efficacy of the proposed approach.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Exploring the performances of the vibrating barriers for the seismic protection of the Zoser pyramid

Cacciola

Shadlou

Ayoub

et al. 2022

Sci Rep

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show abstract

“…In the central and the northern parts of the Gulf, including the adjacent area as far as the Nile, activity decreases markedly from south to north. There is no seismological evidence that seismic activity of the Suez Rift continues into the eastern Mediterranean [1][2][3][4] and [7] as originally suggested by [8,9]. Intra-plate seismicity occurs in Egypt west of the plate boundary and Gulf of Suez zone (e.g.…”

Section: Introduction and Regional Geologymentioning

confidence: 99%

“…Egypt is distinguished by low to moderate earthquake activity related to the relative motions among the African, Arabian and Eurasian plates [1][2][3][4]. The divergent portion of the plate boundary between the African and the Arabian plates lies in the NNW/SSE-trending Red Sea, and connects at the northwest end to the Aqaba-Dead Sea Transform Fault and the Gulf of Suez shear zone.…”

Section: Introduction and Regional Geologymentioning

confidence: 99%

Source Characterization and Ground Motion Modeling Computed From the 3 September 2015 Earthquake, Western Desert, Egypt

el-aal¹,

Tarabees²,

Badreldin³

2017

GEOMATE

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To obtain the characterized source model for prediction of strong ground motions, the ground motion generation area and rupture geometry of an inland crustal earthquake from near-source ground motion records has been estimated. An earthquake, with a magnitude of 4.3 ML and a focal depth of 18 km occurred on September 3, 2015 at 30.45N, 28.44E in the Western Desert of Egypt about 60 km south of El-Dabaa city. This earthquake is the first instrumentally recorded earthquake occurring in this area in several decades. The waveform data of this event has been used for source characterization and ground motion modeling. The present work describes the results of a preliminary study conducted to obtain fault plane solutions of this earthquake from waveform inversion and P-wave polarity. For this purpose, the source parameters related to the strong ground motion were estimated by waveform data and first arrivals recorded by the Egyptian National Seismic Network (ENSN) are used to arrive at focal mechanism solutions. Fault plane solutions for the main shock indicate strike-slip motion. One nodal plate strikes about 330°, is nearly vertical, and indicates right lateral slip. The other nodal plane strikes about 240°, dips very steeply NW, and indicates left lateral slip. Also the peak ground acceleration (PGA) at the El-Dabaa site has been simulated by taking into account an accurate estimation of the source characterization, the path attenuation model, and site amplification. The results have been validated using an actual recording of PGA at one ENSN station that recorded strong ground motion.

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“…Application of the passive seismic techniques is used frequently in Egypt to obtain fundamental site frequency and amplification factors for seismic hazard assessment at several areas (Abd el-aal, 2008(Abd el-aal, , 2010a(Abd el-aal, , 2010b(Abd el-aal, , 2010c(Abd el-aal, , 2013Abdel-Rahman et al, 2012;El-Hady et al, 2012;Toni, 2007Toni, , 2012Abd el-aal and Soliman, 2013;El-Eraki et al, 2013;Abd el-aal et al, 2015). The rapid increasing in urbanization, tourist beach resorts and land use planning in the Red Sea coastal areas are the motivation of the current study.…”

Section: Introductionmentioning

confidence: 99%

Ambient noise for determination of site dynamic properties at Hurghada and Safaga cities, Red Sea, Egypt

Toni¹

2016

Acta Geodynamica Et Geomaterialia

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Recording ambient noise at the surface is increasingly used for the assessment of site response and has become a fundamental task for seismic risk reduction in urbanized areas. Methods based on the measurement of seismic noise, which typically are fast, non invasive, and low cost, have become a very attractive option in microzonation studies. In the current work, we use the ambient noise recordings collected by single seismic stations and two-dimensional arrays to determine the response of the near-surface soil at the two touristic cities of Hurghada and Safaga which are located at the Red Sea coast in Egypt. Based on the horizontal-to-vertical (H/V) spectral ratio Nakamura's technique, recordings of the single stations are analyzed to estimate the fundamental site frequency (f 0 ). Using the raw noise signals recorded by two arrays, we present a joint inversion scheme for surface wave dispersion curves. In particular, the Rayleigh wave dispersion curves and the H/V curves are combined in a joint inversion procedure. We present inversion procedure based on the computation of high-frequency correlation functions between arrays' stations. The calculation of Rayleigh wave phase velocities is based on the frequency-domain SPatial AutoCorrelation (SPAC) and frequency-wavenumber (f-k) methods. Constitutively, a tomographic inversion of the travel-times estimated for each frequency is performed, allowing the vertically varying 1-D shear wave velocity structure below the array to be retrieved. Following the relationship between resonance frequency (f 0 ) and thickness of sediments, the thickness of unconsolidated sediments at the investigated sites are determined. ARTICLE INFO

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Ground motion prediction from nearest seismogenic zones in and around Greater Cairo Area, Egypt

Cited by 37 publications

References 29 publications

Exploring the performances of the vibrating barriers for the seismic protection of the Zoser pyramid

Exploring the performances of the vibrating barriers for the seismic protection of the Zoser pyramid

Source Characterization and Ground Motion Modeling Computed From the 3 September 2015 Earthquake, Western Desert, Egypt

Ambient noise for determination of site dynamic properties at Hurghada and Safaga cities, Red Sea, Egypt

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