Article
Environmental Sciences
Hui Yu, Bin Tang, Juzhi Deng, Hui Chen, Wenwu Tang, Xiao Chen, Cong Zhou
Summary: Magnetotelluric (MT) and magnetovariational (MV) sounding are two geophysical methods used to determine the electrical structure of the earth. Synthetic case studies were conducted to evaluate the performance of different transfer functions in recovering subsurface electrical resistivity. A 3-D inversion was performed using the quasi-Newton method to invert different transfer functions and their combinations. The results showed that the joint inversions of certain response combinations provided superior imaging of the conductive block's horizontal continuity.
Article
Geosciences, Multidisciplinary
Nicholas Petrick, Mohd. Fikri bin Jubidi, Ismail Ahmad Abir
Summary: This study generated a groundwater potential map for Penang Island using remote sensing and geographical information system techniques. The map was validated using 2D resistivity data and showed a strong correlation between groundwater potential score and potential groundwater. The results identified regions with high and low groundwater potential, providing valuable information for water resource management.
NATURAL RESOURCES RESEARCH
(2023)
Article
Geochemistry & Geophysics
Boxin Zuo, Xiangyun Hu, Lizhe Wang, Yi Cai, Mason Andrew Kass, Marcelo Leao-Santos
Summary: A novel method based on unstructured tetrahedral grids and partial differential equations framework is proposed for 3-D magnetic numerical forward modeling and inversion, allowing for accurate representation of complex geological structures and improving the capability and accuracy of magnetic data interpretation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
M. H. Loke, P. B. Wilkinson, O. Kuras, P. Meldrum, D. F. Rucker
Summary: This article discusses the calculation of electric potential in 3-D resistivity inversion algorithms. It introduces two approaches to generating finite-element meshes and proposes an alternative method that combines structured and unstructured meshes, which can significantly reduce the calculation time.
GEOPHYSICAL PROSPECTING
(2022)
Article
Engineering, Electrical & Electronic
Je Hyeong Hong, Donghoon Kang, Ig-Jae Kim
Summary: This research introduces a unified self-calibration method for arrays of same-type 3-D field sensors, which breaks down the array calibration task into three steps, maintains robustness to anomalies, and achieves significant improvements in accuracy and precision of estimated array variables in versatile real-world self-calibration environments compared to state-of-the-art algorithms.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Geochemistry & Geophysics
Szymon Orynski, Waldemar Jozwiak, Krzysztof Nowozynski
Summary: Long-period magnetotelluric soundings were conducted in the eastern part of the Fore-Sudetic Monocline in central Europe to determine the deep geoelectrical structure. The research identified the location of Dolsk and Odra faults in the deep crust and constructed models of electrical conductivity distribution.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Hetian Yang, Tonglin Li, Rongzhe Zhang, Xintong Dong, Yan Zhuang
Summary: This article addresses the challenges of undulating terrain in 3-D direct current (DC) inversion, traditional linearized polarizability inversion for highly polarizable anomalies, and the nonuniqueness of separate resistivity and time-domain-induced polarization (TDIP) inversion. It proposes a joint inversion approach for 3-D DC resistivity and TDIP with structural constraints. Synthetic data examples demonstrate that the proposed method reduces the influence of terrain and improves the recovery of high-polarization anomalies, as well as enhances model resolution and inversion accuracy. The algorithm is successfully applied to the joint inversion of resistivity and polarizability in a mining area in Huzhong area, the Great Khingan Mountains, and Northwestern Heilongjiang Province.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Geochemistry & Geophysics
Rongzhe Zhang, Haoyuan He, Xintong Dong, Tonglin Li, Cai Liu, Xinze Kang
Summary: This study proposes a 3-D gravity data focusing inversion algorithm based on the supervised descent method (SDM) to overcome the limitations of traditional gravity inversion methods. The method shows good potential for improving the accuracy and efficiency of gravity data inversion.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Geochemistry & Geophysics
Yinchu Li, Dikun Yang
Summary: This study demonstrates the potential of using steel-cased wells as long electrodes for real-time monitoring of fracturing fluid flow and explores the feasibility of electric fluid imaging. Deep learning framework is adopted to address the challenging imaging problem in conventional regularized inversions.
Article
Multidisciplinary Sciences
Ganiyu O. Mosuro, Niyi-Ola Adebisi, Stephen O. Ariyo, Kamaldeen O. Omosanya, Olateju O. Bayewu, Moroof O. Oloruntola
Summary: This study defines a new boundary between crystalline and sedimentary rocks in the Eastern Dahomey Basin of Nigeria using a geophysical approach combining aeromagnetic and ground resistivity data. The results demonstrate that areas previously designated as sedimentary terrains actually belong to the basement or transition zone, providing a revised geological map of the region.
SCIENTIFIC REPORTS
(2021)
Article
Geochemistry & Geophysics
Alexander Grayver
Summary: This study presents global 3-D electrical conductivity models of the world ocean and marine sediments, and demonstrates a significant impact of these models on electromagnetic responses across a wide range of frequencies through numerical simulations. The inclusion of more realistic conductivity models of the ocean and seabed sediments is beneficial for both marine and land-based surveys designed for subsurface conductivity imaging or Space Weather modeling.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Environmental Sciences
Huaqing Liu, Zhengyu Liu, Jordi Morato, Zhen Hu, Linlan Zhuang, Xingsheng Kang, Yonghao Pang
Summary: This study investigated the spatial distribution of clogging matter in a full-scale horizontal subsurface flow treatment wetland using electrical resistivity tomography. The results showed a negative correlation between substrate apparent resistivities and clogging matter fraction. The study also compared the performance of two electrode configurations and found that the Schlumberger array had higher accuracy. The distribution of clogging matter varied at different substrate depths.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Geosciences, Multidisciplinary
Zeyi Dong, Yan Zhan, Qibin Xiao, Ni Li, Bing Han, Xiangyu Sun, Xuehua Liu, Ji Tang
Summary: The Abaga-Dalinor volcanic field in Inner Mongolia is the largest area of intraplate volcanism in Northeast China. New MT data reveals a thick high-resistivity layer in the upper crust and high conductivity anomalies in the middle-lower crust. Saline fluids exsolving from magma ascent are trapped in the middle-lower crust. The volcanism is mainly controlled by pre-existing tectonic weak zones and influenced by vertical magma transport and lateral extension along faults.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Biotechnology & Applied Microbiology
Ahmed S. Abu El Ata, Bassem S. Nabawy, Osman M. Badran
Summary: The study focuses on geoelectric surveys in the Ayun Mousa area to explore hidden springs, utilizing methods like self-potential measurements, vertical electrical resistivity, and electrical resistivity tomography. By analyzing anomalies and faults, the study successfully identifies known and unknown springs. This comprehensive approach provides valuable insights for further exploration and potential groundwater resource management.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Geochemistry & Geophysics
Daniel Blatter, Matthias Morzfeld, Kerry Key, Steven Constable
Summary: This paper is about a mathematical and computational framework for computing uncertainty quantification in regularized inversions of electromagnetic data. It showcases the practical application of the RTO-TKO sampling algorithm and demonstrates its computational advantages and ability to utilize massive parallelism through case studies of seafloor magnetotelluric (MT) and surface-towed controlled source electromagnetic data inversion. The paper also compares the uncertainty quantification of RTO-TKO with results from trans-dimensional sampling and discusses the practical implications of the findings.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Sultan Awad Sultan Araffa, Hamed Abdelhamid Alrefaee, Mostafa Nagy
JOURNAL OF AFRICAN EARTH SCIENCES
(2020)
Article
Environmental Sciences
Sultan A. S. Araffa, Maha Abdelazeem, Hassan S. Sabet, Ahmed M. Al Dabour
Summary: The El Moghra area in the western desert of Egypt is part of a national reclamation project that relies on the local El Moghra Formation as its main aquifer. The region has good soil suitable for agricultural development. The subsurface stratigraphy consists of six geo-electrical units, with the main aquifer represented by the fourth and sixth units intercalated with a clay unit.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Hussain Tawfik El-Badrawy, Sultan Awad Sultan Araffa, Ahmed Fathy Gabr Gabr
Summary: This study evaluates the groundwater situation of the Nubian sandstone aquifers in Egypt's central Sinai area by analyzing gravity and magnetic data, using techniques like structural indexes, Euler deconvolution, and geoelectrical resistivity measurements. The study identifies main structural trends and deep-seated structures affecting groundwater aquifers, as well as the thickness and resistivity values of the aquifers through geoelectrical measurements.
ACTA GEODYNAMICA ET GEOMATERIALIA
(2021)
Article
Geochemistry & Geophysics
Usama Saad Abdelhamid Massoud, Hassan Mohamed El-Shayeb, Mohamed El-Said Mohamed Mebed, Sultan Awad Sultan Araffa, Hamada Salama Abd El-Hady, Hamdy Ahmed El-Desouky
Summary: This study integrates remote sensing and geophysical data to identify the hydrological conditions of the Naqab reservoir watershed. The research successfully identified the subsurface structures, groundwater flow, and watershed management strategies in this sub-basin. The results suggest the presence of various fault trends and aquifer systems, providing crucial information for water resource management.
ACTA GEODYNAMICA ET GEOMATERIALIA
(2021)
Article
Geosciences, Multidisciplinary
Samah Elbarbary, Sultan A. S. Araffa, Adam El-Shahat, Mohamed Abdel Zaher, Khaled M. Khedher
Summary: This study aims at determining flood parameters in the Wadi El-Arish basin and uses various methods to calculate runoff volume and hydrographs. Through GIS techniques, the most favorable areas for groundwater potential are identified.
JOURNAL OF AFRICAN EARTH SCIENCES
(2021)
Article
Engineering, Environmental
Sultan Awad Sultan Araffa, Mohamed Mostafa Gobashy, Mohamed H. Khalil, Ahmed Abdelaal
Summary: In the Mokattam area in Cairo, Egypt, various techniques such as geotechnical techniques, remote sensing, and geophysical tools are used to study the subsurface lithology, caves, and structures to evaluate potential geotechnical problems for future development. Remote sensing shows main trends of surface lineaments are E-W to NW-SE, while the minor trends are N-S to NE-SW. The subsurface stratigraphy consists of fractured limestone, clay, marly limestone, dolomitic limestone, marl and marly limestone, and limestone from the surface to the bottom.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Geosciences, Multidisciplinary
Mohamed A. L. Deep, Sultan Awad Sultan Araffa, Salah A. Mansour, Ayman Taha, Ahmed Mohamed, Abdullah Othman
Summary: An integrated approach using satellite remote sensing and geophysical techniques was employed to investigate groundwater occurrence in a mountainous area north of Abha city. The study uncovered water saturation zones in fractured basement rocks, with some parts having a saturated zone thickness exceeding 100 meters.
JOURNAL OF AFRICAN EARTH SCIENCES
(2021)
Article
Environmental Sciences
Sultan A. S. Araffa, Sami H. Abd El Nabi, Ahmad S. Helaly, Mohamed A. Dawoud, Mahmoud S. Sharkawy, Noha M. Hassan
Summary: This study assesses the groundwater aquifer in the Gulf of Suez region and determines the water quality using hydrochemical and electrical resistivity techniques. The results show that there are five geoelectrical layers in the subsurface, with the third layer representing the freshwater aquifer and the fourth layer representing the brackish water aquifer.
GEOCARTO INTERNATIONAL
(2022)
Article
Environmental Sciences
Ahmed ElGalladi, Sultan Araffa, Mahmoud Mekkawi, Mahmoud Abd-AlHai
Summary: Using Landsat-8 and aeromagnetic data, this study successfully delineated new gold and mineralization potential zones in the Wadi-Allaqi district of the Eastern Desert of Egypt. Through remote sensing techniques and analysis of aeromagnetic data, alteration zones and different geological units were identified, and the pathways of ascending hydrothermal fluids and the main trends of dominant structural systems were revealed.
EGYPTIAN JOURNAL OF REMOTE SENSING AND SPACE SCIENCES
(2022)
Article
Geochemistry & Geophysics
Belal Mohamed Abdelhamed, Sultan Awad Sultan Araffa, Tharwat Abdelhafeez
Summary: The current study aims to determine the basement configuration and basement-related structural elements of the Abu Gharadig basin. Using integrated interpretation of potential field and seismic reflection data, the study delineates the subsurface features that affect the configuration of reservoirs in the area. Main faults, with NW-SE and NWN-SES trends, primarily affect the Lower and Upper Cretaceous sequences, which have an impact on the structural configuration of the oil fields.
EXPLORATION GEOPHYSICS
(2023)
Article
Environmental Sciences
Sultan Awad Sultan Araffa, Mahmoud Mohamed Abd-AlHai, Mahmoud Mohamed Mekkawi, Ahmed Abdel-Moniem Elgalladi
Summary: This study successfully mapped alteration zones and listvenites, and detected mineralized zones and deep mineralized sources in the Wadi Haimur area through the use of remote sensing data and geophysical surveys. Geochemical sampling confirmed these findings, indicating the presence of potential gold mineral resources in the area.
GEOCARTO INTERNATIONAL
(2022)
Article
Environmental Sciences
Ali Shebl, Mahmoud Ibrahim Abdelaziz, Hosni Ghazala, Sultan Awad Sultan Araffa, Mahmoud Abdellatif, Arpad Csamer
Summary: Groundwater demand has increased significantly due to population growth, particularly in arid areas. This study utilized various geological, topographical, and remote sensing data, combined with GIS and Analytic Hierarchy Process (AHP), to explore groundwater potential zones in the central part of the Sinai Peninsula, Egypt. Geoelectrical analysis was also conducted to validate these potential zones.
EGYPTIAN JOURNAL OF REMOTE SENSING AND SPACE SCIENCES
(2022)
Article
Water Resources
S. A. S. Araffa, H. S. Sabet, M. H. Mahmoud
Summary: The Nubian sandstone aquifer (NSA) is characterized using 19 VES stations, 201 gravity stations, and 183 magnetic stations. The interpretation results show that the upper surface depth of the NSA ranges from 707 to 1154 m, with resistivities indicating good groundwater quality. The study region exhibits various structural characteristics in different trends, including northwest-southeast, northeast-southwest, and east-west trends.
APPLIED WATER SCIENCE
(2023)
Article
Geochemistry & Geophysics
Mohamed Mostafa Gobashy, Mahmoud M. Mekkawi, Sultan Awad Sultan Araffa, Moahmed M. Ezz M. Eldin, Mohamed Hassan Khalil
Summary: Magnetic methods have shown efficiency and potential in the gold mineralization industry. Applying digital magnetic filters can enhance interpretation and identification of gold opportunities. The Um Garayat (UG) region in southeastern Egypt is a potential area for gold mining, and exploiting its magnetic signature for investment is of great interest.
PURE AND APPLIED GEOPHYSICS
(2023)
Article
Geosciences, Multidisciplinary
Sultan Awad Sultan Araffa, Sayed Bedair
Summary: Two geophysical tools were utilized to delineate the configuration of the Nubian sandstone aquifer in the study area, revealing dominant faults striking in different directions and variable aquifer thickness. The geoelectrical data indicated the presence of 5 units in the area, with freshwater of high quality available for various purposes.
NATURAL RESOURCES RESEARCH
(2021)
