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

Toni, Mostafa

doi:10.13168/agg.2016.0004

Cited by 10 publications

(4 citation statements)

References 48 publications

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“…The HVSR method is the most applicable technique for estimation the soft sedimentary cover thickness (e.g. Ibs-von Seht and Wohlenberg 1999;Parolai et al 2002;Fäh et al 2003;Hinzen et al 2004;Toni et al 2016aToni et al , 2016bTrevisani et al 2017;Trevisani and Boaga 2018;Abd El-aal 2018). The basic concept of Nakamura's technique can be described in a simplest case ( Figure 5), in a onedimensional soft sedimentary layer (soil: denoted as subscript "s") above bedrock (denoted as subscript "b").…”

Section: Hvsr Methods (Nakamura Technique)mentioning

confidence: 99%

Estimation of seismic site effect at the new Tiba City proposed extension, Luxor, Egypt

Mohamed

Ali

Mostafa

2020

NRIAG Journal of Astronomy and Geophysics

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The Horizontal-to-Vertical Spectral Ratio (HVSR) technique is one of the most suitable tools for estimating the geological effect on ground motion. The main target of this study is to estimate the site effect and the fragility index value at the new Tiba City proposed extension. To achieve these targets, 21 ambient vibration recordings were conducted with 1 km grid to cover the investigated area. The estimated predominant frequency (f 0) distribution is a relative uniform and occurs at low frequency, ranging from 0.35 to 0.75 Hz and its maximum corresponding amplitude of seismic wave (A 0) starts from 3.1 up to 6.5. The qualitative interpretation of loose sedimentary cover thickness is large (136 to 410 m with average ~270 m) that coincided with occurrence of (f 0) at low level. The fragility index for the ground (K g) at each measured site was computed depending on the estimated H/V amplitude and corresponding (f 0), and found to range from 17 to 118 across the investigated area. The highest values of K g were obviously found in the northeastern part of the proposed site, where the highest amplification factor and the lowest fundamental frequency are found.

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Section: Hvsr Methods (Nakamura Technique)mentioning

confidence: 99%

Estimation of seismic site effect at the new Tiba City proposed extension, Luxor, Egypt

Mohamed

Ali

Mostafa

2020

NRIAG Journal of Astronomy and Geophysics

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“…This zone is covered mainly by Quaternary deposits, Sabkha deposits (fine sand, silt, evaporates), and recent Wadi (Valley) deposits (detritals of sand, silt, and gravel) (EGSMA, 1981;Conoco, 1987;Said, 1990). At Hurghada, Zafarana, and Suez, the site amplification has been calculated by using shear wave velocity profiles obtained in Hurghada by Toni et al (2016a), in Zafarana by Abd el-aal et al (2016), and in Suez by Mohamed et al (2016). An example of the shear wave velocity profiles used in the determination of site amplification in the current study is depicted in Fig.…”

Section: Site Effect Evaluationmentioning

confidence: 97%

“…The site amplification functions were determined from the shear wave velocity-site amplification relationship (Tamura et al, 2000). The shear wave velocity is taken from the previous work in Hurghada (Toni et al, 2016a), Zafarana (Abd el-aal et al, 2016), and Suez (Mohamed et al, 2016). In Ras Gharib and Ain Sokhna, a field survey of microtremor single station has been carried out to estimate the site effect using H/V spectral ratio method (Nakamura, 1989).…”

Section: Fig 5 H/v Spectral Ratio Curves Obtained At Zone a In Rasmentioning

confidence: 99%

“…The site response is estimated in the studied areas by using microtremor data that have been collected from Ain Sokhna and Ras Gharib. For Hurghada, Zafarana, and Suez, geotechnical information used in site effect estimation is taken from Toni et al (2016a), Abd el-aal et al 2016, respectively. According to site response, the investigated areas are classified into two zones: Zone A and Zone B, where Zone A is characterized by higher site amplification than Zone B.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of strong ground motion parameters of the 1 June 2013 Gulf of Suez earthquake, Egypt

Toni

2017

NRIAG Journal of Astronomy and Geophysics

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This article aims to simulate the ground motion parameters of the moderate magnitude (M L 5.1) June 1, 2013 Gulf of Suez earthquake, which represents the largest instrumental earthquake to be recorded in the middle part of the Gulf of Suez up to now. This event was felt in all cities located on both sides of the Gulf of Suez, with minor damage to property near the epicenter; however, no casualties were observed. The stochastic technique with the site-dependent spectral model is used to simulate the strong ground motion parameters of this earthquake in the cities located at the western side of the Gulf of Suez and north Red Sea namely: Suez, Ain Sokhna, Zafarana, Ras Gharib, and Hurghada. The presence of many tourist resorts and the increase in land use planning in the considered cities represent the motivation of the current study. The simulated parameters comprise the Peak Ground Acceleration (PGA), Peak Ground Velocity (PGV), and Peak Ground Displacement (PGD), in addition to Pseudo Spectral Acceleration (PSA). The model developed for ground motion simulation is validated by using the recordings of three accelerographs installed around the epicenter of the investigated earthquake. Depending on the site effect that has been determined in the investigated areas by using geotechnical data (e.g., shear wave velocities and microtremor recordings), the investigated areas are classified into two zones (A and B). Zone A is characterized by higher site amplification than Zone B. The ground motion parameters are simulated at each zone in the considered areas. The results reveal that the highest values of PGA, PGV, and PGD are observed at Ras Gharib city (epicentral distance $ 11 km) as 67 cm/s 2 , 2.53 cm/s, and 0.45 cm respectively for Zone A, and as 26.5 cm/s 2 , 1.0 cm/s, and 0.2 cm respectively for Zone B, while the lowest values of PGA, PGV, and PGD are observed at Suez city (epicentral distance $ 190 km) as 3.0 cm/s 2 , 0.2 cm/s, and 0.05 cm/s respectively for Zone A, and as 1.3 cm/s 2 , 0.1 cm/s, and 0.024 cm respectively for Zone B. Also the highest PSA values are observed in Ras Gharib city as 200 cm/s 2 and 78 cm/s 2 for Zone A and Zone B respectively, while the lowest PSA values are observed in Suez city as 7 cm/s 2 and

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Determining shallow S‐Wave velocity structure and site response parameters in Gwalior basin, Central India, through microtremor measurements

Rajput,

Singh,

Pal

et al. 2024

Near Surface Geophysics

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The Gwalior basin in Central India is of significant geological interest due to its diverse geological formations, tectonic history and landscape features. Its location at the boundary between the stable Indian Shield and tectonically active regions to the north and east creates unique seismotectonic and stress patterns, making it different from other areas in central India. In this study, we conducted microtremor measurements at 46 uniformly distributed sites in and around the basin to evaluate the site characteristics, including shallow shear wave velocity structure (Vs). We used Tromino 3G seismometer, with a flat frequency response from 0.1 Hz to 1024 Hz, for the microtremor measurements. Most of the study area is classified as site class D, with predominant frequencies between 1.6 Hz and 2.7 Hz and peak amplitudes ranging from 3.0 to 9.0. Our results show that predominant frequencies range from 1.5 Hz to 2.7 Hz for the Quaternary formation, 2.4 Hz to 3.5 Hz for the sandstones of the Kaimur Group and 1.6 Hz to 3.6 Hz for the Gwalior Group rocks. Higher amplitude of the HVSR is observed in the northeastern and eastern parts of the basin. We also estimated a liquefaction potential index (Kg) exceeding 10 for most of the study area, indicating vulnerability under dynamic loading. The thicker alluvium deposits in the northeastern and eastern parts associated with the Swarnarekha River are confirmed by lithological data, showing lower shear wave velocities. Our results provide key parameters for understanding the seismic hazards, which can be useful for assessing seismic risks and generating a disaster risk mitigation plan for the area.

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

Cited by 10 publications

References 48 publications

Estimation of seismic site effect at the new Tiba City proposed extension, Luxor, Egypt

Estimation of seismic site effect at the new Tiba City proposed extension, Luxor, Egypt

Simulation of strong ground motion parameters of the 1 June 2013 Gulf of Suez earthquake, Egypt

Determining shallow S‐Wave velocity structure and site response parameters in Gwalior basin, Central India, through microtremor measurements

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