Overview of Circular Structures of Various Origins and Sizes in Egypt as a Contribution to Natural Hazard Data Mining Based on Remote Sensing Data and Geoinformation Systems (GIS) Analysis


Theilen-Willige, B. (2023). Overview of Circular Structures of Various Origins and Sizes in Egypt as a Contribution to Natural Hazard Data Mining Based on Remote Sensing Data and Geoinformation Systems (GIS) Analysis. Prevention and Treatment of Natural Disasters, 2(2), 7–19.


This study is focused on the detection and typification of circular features with different sizes, origins, and states of erosion as well as on their surrounding tectonic setting, as well as on their impact on the environment and on the occurrence of natural hazards based on different satellite data of Egypt. Sentinel 2, Landsat and ASTER images and Sentinel 1- and ALOS L-band Phased Array Synthetic Aperture Radar (PALSAR)-radar data make it possible to identify larger ring structures as well as smaller circular features like maars or sinkholes in karst areas. Evaluations of the various satellite data contribute to the systematic and standardized inventory ring structures, most of which are related to magmatic intrusions. Such an inventory is a prerequisite for hazard preparedness and should be part of natural hazard data mining integrated into a Geo Information System (GIS). Mapping traces of volcanic activities (craters, maars, cones) is essential as a contribution to land use planning. By gathering the data and integrating the knowledge of the different ring structures in standardized GIS data base one of the many steps towards hazard preparedness and adapted land use planning can be achieved. Circular features are often buried by aeolian and fluvial sediments and become only visible on radar images or on Landsat or ASTER RGB images combining thermal bands. Larger ring structures have not only an influence on groundwater flow but also on geodynamic activity (earthquakes and related secondary effects).


circular structures remote sensing GIS Egypt natural hazards


  1. Mazzini, A.; Lupi, M.; Sciarra, A.; Hammed, M.; Schmidt, S.T.; Suessenberger, A. Concentric Structures and Hydro- thermal Venting in the Western Desert, Egypt. Front. Earth Sci. 2019, 7.
  2. Theilen-Willige, B. Remote Sensing and GeoInformation System (GIS) Contribution to the Inventory and Investigation of Dikes in Egypt. Mediterr. J. Basic Appl. Sci. 2023, 7(3), 60–84.
  3. Farahat, E.S. The Neoproterozoic Kolet Um Kharit bimod- al metavolcanic rocks, south Eastern Desert, Egypt: A case of enrichment from plume interaction? Int. J. Earth Sci., 2006, 95, 275–287.
  4. Elsaid, M.; Aboelkhair, H.; Dardier, A.; Hermas, E.; Mino- ru, U. Processing of Multispectral ASTER Data for Mapping Alteration Minerals Zones: As an Aid for Uranium Exploration in Elmissikat-Eleridiya Granites, Central Eastern Desert, Egypt. Open J. Geol. 2014, 8, (Suppl 1: M5), 69–83.
  5. Radwan, A.; Emam, A.; Elshayeb, G.B.; Younis, M.H. Petrogenesis and tectonic Evolution of the Ring Complexes in Southeastern Desert, Egypt: A Case Study from El-Gezi- ra Alkaline Association. Nucl. Sci. Sci. J., 2023, 12, 1–23.
  6. Tewksbury, B.J.; Tarabees, E.A.; Mehrtens, C.J. Origin of an extensive network of non-tectonic synclines in Eocene limestones of the Western Desert, Egypt. J. African Earth Sci. 2017, 136, 148–167.
  7. Tewksbury, B.J.; Mehrtens, C.J.; Gohlke, S.A.; Tarabees, E.A.; Hogan, J.P. Constraints from Mesozoic siliciclastic cover rocks and satellite image analysis on the slip history of regional E-W faults in the southeast Western Desert, Egypt. J. African Earth Sci. 2017, 136, 119–135.
  8. Theilen-Willige, B.; Naouadir, I. Contribution of Remote Sensing and GIS to the Inventory and Analysis of Factors influencing the Development of Karst Features in the Middle Atlas, Morocco. Eur. J. Environ. Earth Sci., 2022, 3(6), 1–17.
  9. Zahera, M.A.; Elbarbary, S.; El-Shahat, A.; Mesbah, H.; Embaby, A. Geothermal resources in Egypt integrated with GIS-based analysis. J. Volcanol. Geotherm. Res. 2018, 365, 1–12.
  10. El-Wardany, R.M.; Jiao, J.; Zoheir, B.; Kumral, M.; Kaya, M.; Abdelnasser, A. Post-Subduction Granite Magmatism and Gold-Sulfide Mineralization in the Abu Zawal (Fatira) Area, Eastern Desert, Egypt. Minerals, 2023, 13, 489.
  11. United States Geological Survey USGS, Earth Explorer. Available online: (accessed from May to September 2023).
  12. ESA Copernicus Open Access Hub. Available online: (accessed on 20 September 2023).
  13. NASA Earth Data, Alaska Satellite Facility (ASF). JAXA/ METI, satellite data accessed through ASF DAAC. Available online: (accessed from May to September 2023).
  14. Arab Nubia Group Blog, GIS, Remote Sensing & General Applications. Available online: (accessed in September 2023).
  15. Geological Map of Africa—SIGAfrique—1:10,000,000 scale—Bedrock Age, French Geological Survey (BRGM), France (downloaded from the OneGeology portal). Available online: (ac- cessed on 20 September 2023).
  16. Shahin, H.A.A.; Masoud, M.S. Geology, Geochemestry and Radioactivity of Gabal Shendib alkaline Ring Complex, Southeastern Desert. Egypt. Nucl. Sci. Sci. J., 2019, 8, 17–38.
  17. Saber, E.A.; Ali, M.H.; El-Sheikh, A.A. Magmatism and Related Mineralizations in Wadi Hammad, North Eastern Desert, Egypt. Sohag J. Sci. 2023, 8(2), 145–155.
  18. Bosworth, W.; Khalil, S.N.; Ligi, M.; Stockli, D.F.; McClay, K.R. Geology of Egypt: The Northern Red Sea. In The Geology of Egypt; Hamimi, Z., El-Barkooky, A., Frías, J.M., Fritz, H., El-Rahman, Eds.; Springer: Cham, 2020; pp. 343–373.
  19. Bosworth, W.; Stockli, D.F. Early magmatism in the greater Red Sea rift: timing and significance. Can. J. Earth Sci. 2016, 53, 1–19.
  20. Mohamed,A.E.A.; El-Hadidy, M.A.; Deif,A.; Abou Elenean, K. Seismic hazard studies in Egypt. NRIAG J. Astron. Geophys. 2012, 1, 119–140.
  21. Seleem, T.A.; Aboulela, H.A. Seismicity and Geologic Structures Indubitable in Wadi Hagul, North Eastern Desert, Egypt. Int. J. Geosci. 2011, 2, 55–67.
  22. International Seismological Centre-ISC. Earthquake data. Available online: (accessed on 20 September 2023).
  23. US Geological Survey (USGS). Earthquake data. Available online: (accessed on 14 September 2023).
  24. European-Mediterranean Seismological Centre—EMSC, 2023. Earthquake data. Available online: http://www.em- (accessed on 20 September 2023).
  25. Youssef, A.M. An Enhanced Remote Sensing Procedure for Material Mapping in the Western Desert of Egypt: A Tool for Managing Urban Development. Nat. Resour. Res. 2008, 17(4), 215–226.
  26. Youssef, A.M.; El-Shater, A.H.; El-Khashab, M.H.; El-Hadd- ad, B.A. Coupling of field investigations and remote sensing data for karst hazards in Egypt: case study around the Sohag City. Arab. J. Geosci. 2017, 10, 235.
  27. El Aref, M.; Salama, A.; Hammed, M. Morphotectonic Evolution of Qaret El Sheikh Abdallah Depressions and Denuded Paleo-Karst in the White Desert, El Bahari- ya-Farafra Karst Territory, Egypt. Egypt. J. Geo. 2021, 65, 27–53.
  28. Abidi, A.; Dеmеhati, A.; Banouni, H.; Еl Qandil, M. Thе importancе of undеrground cavitiеs dеtеction in thе choicе of constructiblе arеas: casе of thе Agglomеration of Fеz (Morocco). Geotech. Geol. Eng., 2018, 36(3), 1919–1932.
  29. Abd El Aal,A.K.; Nabawy, B.S.; Aqeel,A.; Abidi, A. Geohazards assessment of the karstified limestone cliffs for safe urban constructions, Sohag, West Nile Valley, Egypt. J. Afr. Earth Sci. 2020, 161, 103671.
  30. The Earth Impact Database (EID) created by the Planetary and Space Science Centre (PASSC), Canada, African Impact Structures. Available online: (accessed on 20 September 2023).
  31. Training Package on National Scale Multi‐Hazard Risk Assessment, Theory Book PPRD-EAST. Available online: National_Scale_Multi_Hazard_Risk_Assessment_Theory_ Book?email_work_card=view-paper (accessed on 20 September 2023).
  32. Khedr, M.Z.; Abo Khashaba, S.M.; El-Shibiny, N.H.; Takazawa, E.; Hassan, S.M.; Azer, M.K.; Whattam, S.A.; El-Arafy, R.A.; Ichiyama, Y. Integration of remote sensing and geochemical data to characterize mineralized A-type granites, Egypt: implications for origin and concentration of rare metals. Int. J. Earth Sci. 2023, 1–29.