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Tectonic deformation and subsurface active fault trends of El-Faiyum province, Egypt as deduced by seismicity and potential field data

  • Hamed Abdelhamid AlrefaeeEmail author
  • AbdEl-Aziz Khairy Abd el-aal
Original Paper

Abstract

We utilized the seismicity and the potential field data to study the tectonic deformation and to delineate the seismically active subsurface tectonic trends of El-Faiyum area. To accomplish these goals, we analyzed and interpreted the seismicity data, the reduced to pole total magnetic intensity, and the Bouguer anomaly maps. We also used the spatial distribution of the recent seismic events and the focal mechanism to outline the local seismic zones that control the seismicity of the study area and to determine the sense of the motion along the subsurface active faults. The focal mechanism of the recent seismic events and the interpreted subsurface tectonic faults from the potential field data reflect strike-slip movements with normal components along the subsurface active faults. The gravity and magnetic maps show a NE-SW regional trend with low gravity and magnetic values. The NE-SW regional trend extends across the whole area and could be related to the Pelusium Megashear fault. A NE-SW trend with high gravity and magnetic exists at the northern part and coincides with the Kattania Uplift and the basaltic flows in Gabal Qatrani area. The gravity and magnetic maps also reveal several local anomalies with different polarities, amplitudes, and extensions, which reflect anticlinal and synclinal structures on the basement surface. The seismotectonic map, generated by linking the basement structure map and the spatial distribution of the recent earthquake foci, reveals the dominant tectonic trends and the subsurface active faults.

Keywords

Seismicity Focal mechanism Seismotectonic Gravity Magnetic 

Notes

Acknowledgements

The authors thank the Egyptian National Seismic Network for providing the seismic data. The figures were generated using the Generic Mapping Tool (GMT), Geosoft Software Package and Adobe Illustrator 6. The author appreciates comments and revisions from the reviewers, which improved the manuscript. The authors are also grateful to the editor of the Arabian Journal of Geosciences who gave us a chance to improve the paper.

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Copyright information

© Saudi Society for Geosciences 2017

Authors and Affiliations

  • Hamed Abdelhamid Alrefaee
    • 1
    Email author
  • AbdEl-Aziz Khairy Abd el-aal
    • 2
  1. 1.Department of Geology, Faculty of ScienceKafr Elsheikh UniversityKafr El SheikhEgypt
  2. 2.Seismology DepartmentNational Research Institute of Astronomy and GeophysicsHelwanEgypt

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