Ahmed Meneisy | Aswan University (original) (raw)

Papers by Ahmed Meneisy

Although Egypt may be considered as an area of low seismicity, it has experienced the recurring d... more Although Egypt may be considered as an area of low seismicity, it has experienced the recurring destructive effects of earthquakes throughout its history. The damage distribution is significantly affected by fault geometry and the local site effects. Thus, an appropriate assessment of seismic hazard became a major challenge for efficient mitigation of the seismic risk. This study develops the Geographical Information System (GIS) based three-dimensional (3D) deterministic model to evaluate the seismic hazard map for specified seismic source fault for Egypt. The geometry of a fault plane is generated by a fault-modeling algorithm in which multiple 3D plane sets are interpreted by fault trace, geology, and topography. For estimating the local site effects, the study area is modeled by a 3D grid-mesh system and the ground motion propagation is estimated at each grid by considering the spatial analysis of average shear-wave velocity and a soil susceptibility map. The developed model is ...

NRIAG Journal of Astronomy and Geophysics, 2020

The present work was proposed to prospect the subsurface stratigraphy and hydrogeological conditi... more The present work was proposed to prospect the subsurface stratigraphy and hydrogeological conditions for estimating the most suitable lithology and depth for hosting the power plant disposals without harming the underground water aquifers and soils. Two geophysical approaches were utilised to achieve the goal of this work, the Vertical Electric Sounding (VES) technique and Transient Time Domain Electromagnetic (TDEM). Seven VESes of AB/2 ranging between 300 and 900 metres were conducted reaching depths between 150 and 272 metres. On the other hand, "TDEM" was conducted on two localities in the site utilising laid 400 × 400 metres and 200 × 200 metres loop for transmitting EM field reaching about 1150 metres depth. The interpreted data show that the upper 200 metres represent 3 to 4 geoelectric layers whereas groundwater is found within the uppermost 100 metres and sometimes nearest to the ground's surface. Moreover, at depths starting from 800 metres up to the maximum reached depth 1150 metres show a layer of almost similar resistivity which can be interpreted as a huge thickness of limestone, with particular moisture fractures. The similarity of the resistivity values guides to expect that the moisture represent some fluid seeps on the structural plains and does not rise to be an aquifer of open recharge sources. Therefore, the present study has conducted that it is safe for the power plant disposals to be buried from a depth beginning at least from 850 metres below the surface of the ground.

The Egyptian Journal of Remote Sensing and Space Science, 2020

In this study Aeromagnetic, ground-based magnetic and satellite imagery data have been processed ... more In this study Aeromagnetic, ground-based magnetic and satellite imagery data have been processed and analyzed to delineate surface and subsurface structures to clarify its impacts on groundwater flow direction, and to detect the thickness of groundwater aquifer's (accumulation) in the study area. To achieve this target, an interpretation of satellite digital elevation data is processed to generate the main drainage pattern in the area to delineate the Watersheds basins and where the surface water can be accumulated. Moreover, Aeromagnetic data have been used to detect the sedimentary cover in the area, and to assess the thickness distribution of the Nubian aquifer to detect the most eligible aquifer with the largest thickness, consequently the largest amount of groundwater reserve. Also, the ground magnetic survey was conducted in Wadi El Amal to reassure the results obtained from the airborne data. Two main approach techniques were applied to the data. Firstly, the trend analysis applied to the first vertical derivative map to detect main trend analysis and faults. The second approach is to calculate the depth to the basement, which represents the base of the Nubian aquifer in the area under consideration. The final results of the main trend found as follow, the ENE-WSW, NW-SE, and NE-SW trend which found to be is the main trend. The water table in this area is about 100 m, the calculated depth to the basement in the deepest parts study area is ranging between À300 and À700 below ground surface. The integration between satellite techniques and geophysical tools can give us the whole picture of groundwater distribution and its recharge sources.

Geological evaluation and groundwater assessment, especially in arid areas, are considerable targ... more Geological evaluation and groundwater assessment, especially in arid areas, are considerable targets for constructing recent and sustainable development communities. The current work aims to apply an integrated approach to acquire geologic structures and groundwater potentiality at highly deformed area. As a case study, remote sensing (RS), aeromagnetic, and geoelectrical data are conducted to delineate the subsurface structures and hydrogeological regime at Aswan City. Initially, remote sensing data with GIS software are utilized to delineate the surface structures and watershed configuration. Moreover, the reduced to magnetic pole (RTP) aeromagnetic data is processed and interpreted using appropriate filters. In an attempt to demonstrate the subsurface structures and basement relief maps, the RTP map was analyzed considering the RS data which was stated in previous stage. In the light of RTP aeromagnetic results and well logging data, the direct current resistivity (DCR) sounding ...

Journal of Environmental and Engineering Geophysics, 2020

It is well known that the local geological characteristics in terms of topographic setting and th... more It is well known that the local geological characteristics in terms of topographic setting and the existence of soft sediments over bedrock may affect earthquake waves and cause seismic amplification. These effects are called “site effects”. Microtremors which provide an efficient practical tool for site effects estimation were recorded at 43 sites in Beni Suef City, Egypt. The recorded seismic signals were analyzed using the Horizontal-to-Vertical Spectral Ratio (HVSR) method. The targeted site parameters are the fundamental frequency ( f0) and the corresponding amplitude of seismic waves ( A0). Selected H/V curves with clear peak frequency have been inverted to infer the S-wave velocity profile of the underlying sediments. Information about subsurface sediments needed for the inversion process was extracted from available boreholes data. Moreover, the estimated values of f0 and A0 have been used for a preliminary calculation of the seismic vulnerability index ( Kg) which represent...

Arabian Journal of Geosciences

Arabian Journal of Geosciences

The main purpose of paper is to detect the active subsurface structures and their seismic implica... more The main purpose of paper is to detect the active subsurface structures and their seismic implications located at the southern part of Cairo area. To achieve this target, the reduction-to-the-pole (RTP) aeromagnetic, ground magnetic, magnetotelluric, and seismological data were used. The RTP aeromagnetic data was used to delineate the regional extensions of the subsurface structures along a wide area. The activities of the detected structures were confirmed from the distributions of the earthquake epicenters along the investigated area. The type of the fault structures was identified using the focal mechanism analyses for the seismological data. Moreover, the active subsurface structures have been traced using a detailed ground magnetic survey for the study area. In addition, the magnetotelluric survey was carried out crossing the fault structures which detected previously from aeromagnetic. The results show that the selected area is identified as active zone for earthquakes. This zone extends from Gulf of Suez at the east crossing Wadi Araba and Nile River to south Giza and Cairo cities where the 12th October 1992 earthquake's epicenter exists. Finally, the Curie magnetic depth investigation indicates the activities of these structures where the curie magnetic depths reach less than 8 km.

Although Egypt may be considered as an area of low seismicity, it has experienced the recurring d... more Although Egypt may be considered as an area of low seismicity, it has experienced the recurring destructive effects of earthquakes throughout its history. The damage distribution is significantly affected by fault geometry and the local site effects. Thus, an appropriate assessment of seismic hazard became a major challenge for efficient mitigation of the seismic risk. This study develops the Geographical Information System (GIS) based three-dimensional (3D) deterministic model to evaluate the seismic hazard map for specified seismic source fault for Egypt. The geometry of a fault plane is generated by a fault-modeling algorithm in which multiple 3D plane sets are interpreted by fault trace, geology, and topography. For estimating the local site effects, the study area is modeled by a 3D grid-mesh system and the ground motion propagation is estimated at each grid by considering the spatial analysis of average shear-wave velocity and a soil susceptibility map. The developed model is ...

NRIAG Journal of Astronomy and Geophysics, 2020

The present work was proposed to prospect the subsurface stratigraphy and hydrogeological conditi... more The present work was proposed to prospect the subsurface stratigraphy and hydrogeological conditions for estimating the most suitable lithology and depth for hosting the power plant disposals without harming the underground water aquifers and soils. Two geophysical approaches were utilised to achieve the goal of this work, the Vertical Electric Sounding (VES) technique and Transient Time Domain Electromagnetic (TDEM). Seven VESes of AB/2 ranging between 300 and 900 metres were conducted reaching depths between 150 and 272 metres. On the other hand, "TDEM" was conducted on two localities in the site utilising laid 400 × 400 metres and 200 × 200 metres loop for transmitting EM field reaching about 1150 metres depth. The interpreted data show that the upper 200 metres represent 3 to 4 geoelectric layers whereas groundwater is found within the uppermost 100 metres and sometimes nearest to the ground's surface. Moreover, at depths starting from 800 metres up to the maximum reached depth 1150 metres show a layer of almost similar resistivity which can be interpreted as a huge thickness of limestone, with particular moisture fractures. The similarity of the resistivity values guides to expect that the moisture represent some fluid seeps on the structural plains and does not rise to be an aquifer of open recharge sources. Therefore, the present study has conducted that it is safe for the power plant disposals to be buried from a depth beginning at least from 850 metres below the surface of the ground.

The Egyptian Journal of Remote Sensing and Space Science, 2020

In this study Aeromagnetic, ground-based magnetic and satellite imagery data have been processed ... more In this study Aeromagnetic, ground-based magnetic and satellite imagery data have been processed and analyzed to delineate surface and subsurface structures to clarify its impacts on groundwater flow direction, and to detect the thickness of groundwater aquifer's (accumulation) in the study area. To achieve this target, an interpretation of satellite digital elevation data is processed to generate the main drainage pattern in the area to delineate the Watersheds basins and where the surface water can be accumulated. Moreover, Aeromagnetic data have been used to detect the sedimentary cover in the area, and to assess the thickness distribution of the Nubian aquifer to detect the most eligible aquifer with the largest thickness, consequently the largest amount of groundwater reserve. Also, the ground magnetic survey was conducted in Wadi El Amal to reassure the results obtained from the airborne data. Two main approach techniques were applied to the data. Firstly, the trend analysis applied to the first vertical derivative map to detect main trend analysis and faults. The second approach is to calculate the depth to the basement, which represents the base of the Nubian aquifer in the area under consideration. The final results of the main trend found as follow, the ENE-WSW, NW-SE, and NE-SW trend which found to be is the main trend. The water table in this area is about 100 m, the calculated depth to the basement in the deepest parts study area is ranging between À300 and À700 below ground surface. The integration between satellite techniques and geophysical tools can give us the whole picture of groundwater distribution and its recharge sources.

Geological evaluation and groundwater assessment, especially in arid areas, are considerable targ... more Geological evaluation and groundwater assessment, especially in arid areas, are considerable targets for constructing recent and sustainable development communities. The current work aims to apply an integrated approach to acquire geologic structures and groundwater potentiality at highly deformed area. As a case study, remote sensing (RS), aeromagnetic, and geoelectrical data are conducted to delineate the subsurface structures and hydrogeological regime at Aswan City. Initially, remote sensing data with GIS software are utilized to delineate the surface structures and watershed configuration. Moreover, the reduced to magnetic pole (RTP) aeromagnetic data is processed and interpreted using appropriate filters. In an attempt to demonstrate the subsurface structures and basement relief maps, the RTP map was analyzed considering the RS data which was stated in previous stage. In the light of RTP aeromagnetic results and well logging data, the direct current resistivity (DCR) sounding ...

Journal of Environmental and Engineering Geophysics, 2020

It is well known that the local geological characteristics in terms of topographic setting and th... more It is well known that the local geological characteristics in terms of topographic setting and the existence of soft sediments over bedrock may affect earthquake waves and cause seismic amplification. These effects are called “site effects”. Microtremors which provide an efficient practical tool for site effects estimation were recorded at 43 sites in Beni Suef City, Egypt. The recorded seismic signals were analyzed using the Horizontal-to-Vertical Spectral Ratio (HVSR) method. The targeted site parameters are the fundamental frequency ( f0) and the corresponding amplitude of seismic waves ( A0). Selected H/V curves with clear peak frequency have been inverted to infer the S-wave velocity profile of the underlying sediments. Information about subsurface sediments needed for the inversion process was extracted from available boreholes data. Moreover, the estimated values of f0 and A0 have been used for a preliminary calculation of the seismic vulnerability index ( Kg) which represent...

Arabian Journal of Geosciences

Arabian Journal of Geosciences

The main purpose of paper is to detect the active subsurface structures and their seismic implica... more The main purpose of paper is to detect the active subsurface structures and their seismic implications located at the southern part of Cairo area. To achieve this target, the reduction-to-the-pole (RTP) aeromagnetic, ground magnetic, magnetotelluric, and seismological data were used. The RTP aeromagnetic data was used to delineate the regional extensions of the subsurface structures along a wide area. The activities of the detected structures were confirmed from the distributions of the earthquake epicenters along the investigated area. The type of the fault structures was identified using the focal mechanism analyses for the seismological data. Moreover, the active subsurface structures have been traced using a detailed ground magnetic survey for the study area. In addition, the magnetotelluric survey was carried out crossing the fault structures which detected previously from aeromagnetic. The results show that the selected area is identified as active zone for earthquakes. This zone extends from Gulf of Suez at the east crossing Wadi Araba and Nile River to south Giza and Cairo cities where the 12th October 1992 earthquake's epicenter exists. Finally, the Curie magnetic depth investigation indicates the activities of these structures where the curie magnetic depths reach less than 8 km.