Probabilistic Seismic Hazard Deaggregation for Selected Egyptian Cities

Here we present a new updated and unified Poissonian earthquake catalog for Mexico. The details about the catalog compilation, the removal of duplicate events, unifying the magnitude scales, removal of dependent events through the declustering process and its completeness analysis are presented. Earthquake and focal mechanism data have been compiled from various local, regional and international sources. Large earthquake events (MW ≥ 6.5) have been carefully revised for their epicentral locations and magnitudes from trusted publications. Different magnitude-conversion relationships, compatible with available local and regional ones, has been established to obtain unified moment magnitude estimates for the whole catalog. Completeness periods for the declustered catalog were estimated for the definition of appropriate seismic source models for the whole territory. The final unified Poissonian earthquake catalog spans from 1787 to 2018, covering a spatial extent of 13° to 33°N and 91° to 117°W. This catalog is compatible with other published catalogs providing basis for new analysis related to seismicity, seismotectonics and seismic hazard assessment in Mexico.

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“…76–78 ), and others by using earthquake records from different seismotectonic environments (e.g. 66–68,79–87 ).…”

Section: Methodsmentioning

confidence: 99%

An updated and unified earthquake catalog from 1787 to 2018 for seismic hazard assessment studies in Mexico

et al. 2019

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“…It is surrounded by three plate boundaries where convergent (Hellenic and Cyprian Arc systems), divergent (Gulf of Suez-Red Sea) and transform faulting (Gulf of Aqaba-Dead Sea fault system) processes are currently occurring [2]. Egypt is characterized by earthquakes of low to moderate magnitudes [3,4] which mainly concentrate along the surrounding plate boundaries (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Crustal Strain and Stress Fields in Egypt from Geodetic and Seismological Data

et al. 2021

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The comparison between crustal stress and surface strain azimuthal patterns has provided new insights into several complex tectonic settings worldwide. Here, we performed such a comparison for Egypt taking into account updated datasets of seismological and geodetic observations. In north-eastern Egypt, the stress field shows a fan-shaped azimuthal pattern with a WNW–ESE orientation on the Cairo region, which progressively rotated to NW–SE along the Gulf of Aqaba. The stress field shows a prevailing normal faulting regime, however, along the Sinai/Arabia plate boundary it coexists with a strike–slip faulting one (σ1 ≅ σ2 > σ3), while on the Gulf of Suez, it is characterized by crustal extension occurring on near-orthogonal directions (σ1 > σ2 ≅ σ3). On the Nile Delta, the maximum horizontal stress (SHmax) pattern shows scattered orientations, while on the Aswan region, it has a WNW–ESE strike with pure strike–slip features. The strain-rate field shows the largest values along the Red Sea and the Sinai/Arabia plate boundary. Crustal stretching (up to 40 nanostrain/yr) occurs on these areas with WSW–ENE and NE–SW orientations, while crustal contraction occurs on northern Nile Delta (10 nanostrain/yr) and offshore (~35 nanostrain/yr) with E–W and N–S orientations, respectively. The comparison between stress and strain orientations over the investigated area reveals that both patterns are near-parallel and driven by the same large-scale tectonic processes.

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“…The obtained PGA and SA values are 0.065g and 0.158g, respectively, for a return period of 475 years and for rock-site conditions. Accordingly, the proposed site in Wadi Habib is characterized by a relatively low to moderate seismicity and is considered as a safe region for the construction purposes according to the world standard regulations and seismic building codes guidelines(Sawires et al, 2016(Sawires et al, , 2017 and Mohamed Arfa and Fat-Helbary R.E, 2021).…”

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Geotechnical Properties Evaluation Utilizing Geological, Geomorphological and Shallow Geophysical Surveys of Wadi Habib Entrance Site, Eastern Desert, Egypt.

Omran

El-Younsy

2021

Preprint

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An integrated approach is carried out in a proposed engineering site at Wadi Habib, Egypt. The study aimed to characterize the geological, geotechnical and hydrogeological environment evaluate their suitability for civil engineering constructions. The present study reveals that the area is mainly covered by the Eocene carbonate rocks uncomfortably overlain, in some areas, by the Oligocene gravels. The Pliocene mudstone and the Pleistocene/recent fine clastic deposits are recorded in the subdued ground. The surface and subsurface fractures around Wadi Habib area are mainly represented by high angle normal faults trending NNW- SSE, NW-SE, WNW-ESE and ENE-WSW. The morphometric analysis reveals that Wadi Habib is generally of seventh order, sinuous course, elongated, untainous and hilly, course topographic texture and high resistance and low permeable floor. A total of 32 seismic refraction profiles were conducted in two directions N 35° W and N 55° E. Three geoseismic layers of different lithological, compressional and shear velocities and elastic properties are achieved. The geotechnical parameters involving kinetic elastic moduli, soil material competence parameters and the bearing capacity are estimated and hence indicated the characteristics of the foundation materials for civil engineering constructions in the investigated site. Also, 30 VES’es are implemented and interpreted to test the geological and hydrogeological conditions. Subsurface geoelectrical layers are delineated and verified. The proposed site is characterized by a relatively low to moderate seismicity. The geotechnical parameters of geoseismic layers and the hydrogeological probable troublesome (cavities, fractures, faults) for building structure and soil suitability for foundation purposes are concluded

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Probabilistic Seismic Hazard Deaggregation for Selected Egyptian Cities

Cited by 13 publications

References 35 publications

An updated and unified earthquake catalog from 1787 to 2018 for seismic hazard assessment studies in Mexico

An updated and unified earthquake catalog from 1787 to 2018 for seismic hazard assessment studies in Mexico

Crustal Strain and Stress Fields in Egypt from Geodetic and Seismological Data

Geotechnical Properties Evaluation Utilizing Geological, Geomorphological and Shallow Geophysical Surveys of Wadi Habib Entrance Site, Eastern Desert, Egypt.

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