Using microtremors for microseismic zonation in Cairo’s crowded, urban areas

Gamal, Mohamed

doi:10.1007/s10950-008-9113-3

Cited by 9 publications

(9 citation statements)

References 3 publications

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“…The earthquake was strong enough to reach Cairo city. The recording station of EL Mokatam was by coincidence in operation at about 370 km from the earthquake epicenter [11] ( Figure 7). The underlying soil is mainly limestone rock and the maximum spectral acceleration was found to be about 40 cm/sec 2 at a period of 0.3 sec (~3.5 Hz) which is relatively higher than the spectral acceleration in Jordanian axis direction (~7 cm/sec 2 at Amman, 390 km away from the epicenter), this could be attributed to the difference in attenuation path which is very high in the Jordanian axis, most probably due to the richness in alluvium content.…”

Section: Response Spectra Of the Great Aqaba Earthquakementioning

confidence: 99%

“…The Microtremors site response method [11] was used to determine the soil natural frequency of vibration and amplification factor for Aqaba-Amman path International Journal of Geosciences Table 1). A Kinemetrics Altus-K2 acceleration station was used to determine the site response for 19 soil stations shown in Figure 10.…”

Section: Soil Reponses For Sinai Peninsula and Some Jordanian Soilsmentioning

confidence: 99%

“…6) After that, we smoothed the final response curves by running average filter for better viewing. A complete description to the methodology can be found in [11] Mohamed Gamal, 2008. , 1995AQA2, 1995Dahab, 1996Nuweiba, 1996 Average Spectrum Frequency (Hz) International Journal of Geosciences Figure 10.…”

Section: Soil Reponses For Sinai Peninsula and Some Jordanian Soilsmentioning

confidence: 99%

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The Great Gulf of Aqaba 1995 Earthquake Design Response Spectra over Sinai Peninsula and Some Jordanian Soils

Gamal¹,

Abdelwahed²

2019

IJG

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The Gulf of Aqaba area is considered one of the most terrific touristic areas in the Middle East. The aim of the present work is to determine the amount of seismic hazards that the constructions may suffer due to seismic activities. This is done by determining the design response spectrum for this area from available earthquake response spectra, then taking into consideration the soil response for some Egyptian and Jordanian soils. The main shock of the November 22, 1995, the Gulf of Aqaba and its aftershocks were mainly used in producing the design response spectrum. This earthquake was considered as the biggest earthquake that hit this area since 160 years. Its magnitude was determined as Mw = 7.2. Thousands of aftershocks with intermediate magnitude followed the main shock, such as the aftershock that occurred on November 23, 1995 with a local magnitude of M L = 5.4. The best estimate of the focus location was determined in the area between Dahab and Nuweiba cities. This great earthquake was felt in Lebanon, Syria and Israel in the North and Egypt, Saudi Arabia and Sudan in the South. The touristic areas surrounding the Gulf of Aqaba were mostly affected. Different accelerograms for this great earthquake were collected and soil responses spectra for Sinai Peninsula and some Jordanian soils were calculated. The design response spectrum shows an average spectral acceleration of about 250 cm/sec 2 for frequency range between 1-10 HZ. Soil Amplifications were then calculated using Microtremors site response technique and maximum spectral accelerations filtered by the soil were in range between 120-450 cm/sec 2 for the study area. The analysis presented here is intended to be used in the future to allow reducing the seismic risk, help in proper structural design and detailing of buildings and structures to account for beam-column connections and shear reinforcement.

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Section: Response Spectra Of the Great Aqaba Earthquakementioning

confidence: 99%

Section: Soil Reponses For Sinai Peninsula and Some Jordanian Soilsmentioning

confidence: 99%

Section: Soil Reponses For Sinai Peninsula and Some Jordanian Soilsmentioning

confidence: 99%

See 1 more Smart Citation

The Great Gulf of Aqaba 1995 Earthquake Design Response Spectra over Sinai Peninsula and Some Jordanian Soils

Gamal¹,

Abdelwahed²

2019

IJG

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“…Earthquake effects vary in Cairo due to the existence of variable soil types (Gamal, 2009). For example, there are rocky sites, like the yellow limestone stratum in the Old Cairo area; unconsolidated sands and gravels in Nasser City and Misr El Gedida, and alluvial deposits in the Nile Valley, El Zamalek and Imbaba.…”

Section: Case Study 4: the Dahshur Earthquake Of 1992mentioning

confidence: 99%

Urban geology of African megacities

Davies

2015

Journal of African Earth Sciences

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“…Microtremor analysis is a method largely adopted for the zoning of seismic areas (e.g., [21][22][23][24][25][26][27]). In all these previous studies, the HVSR technique provided a good evaluation of the fundamental resonance frequencies of the sedimentary coverage [29] and, though controversial, a coarse qualitative assessment of the related amplification [30].…”

Section: Pre-existing Available Data and New Hvsr Measurementsmentioning

confidence: 99%

Preliminary seismic microzonation in a mountainmunicipality of Tuscany (Italy)

Matassoni¹,

Fiaschi²,

Silengo

et al. 2015

Open Geosciences

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Abstract:In this paper we describe a microzonation survey carried out at a mountain Municipality (Piteglio, Northern Apennines). We complemented the available data by conducting 106 microtremor measurements for Horizontal-toVertical Spectral Ratio (HVSR) analysis. Most of the data concern the three major rural villages (Piteglio-Prataccio, Popiglio and Prunetta). Furthermore, we installed a field mobile seismic station at two of the major villages, in order to obtain earthquakes recordings. The HVSR analysis shows amplification effects due to eluvial or colluvial deposits overlying the seismic bedrock, even for areas previously mapped as bedrock outcrops. Most zones characterized by sandstone outcrops show peaked HVSR traces. This observation could be also interpreted in terms of a topographic effect. In contrast, areas characterised by chaotic materials (olistostrome) generally exhibit a flat HVSR. Other areas of seismic amplification were identified on alluvial and landslide deposits. Results by HVSR analysis are well correlated with available data from geo-technical and geophysical surveys, thus allowing to invert HVSRs for the physical properties of the subsoil. Subsoil properties can thus be extrapolated also in areas for which only measurements of seismic noise are available. Moreover, noise HVSRs agree well with those from earthquakes recorded at the different selected sites.

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Using microtremors for microseismic zonation in Cairo’s crowded, urban areas

Cited by 9 publications

References 3 publications

The Great Gulf of Aqaba 1995 Earthquake Design Response Spectra over Sinai Peninsula and Some Jordanian Soils

The Great Gulf of Aqaba 1995 Earthquake Design Response Spectra over Sinai Peninsula and Some Jordanian Soils

Urban geology of African megacities

Preliminary seismic microzonation in a mountainmunicipality of Tuscany (Italy)

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