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Seismicity and major geologic structures of Tiran and Sanafir islands and their surroundings in the Red Sea

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Abstract

Tiran and Sanafir islands and their surrounding areas are very important due to their location within the Red Sea, which is in a triple junction among the African and Arabian plates and the Sinai Peninsula microplate. Consequently, this area should be studied from a geological point of view, particularly because there is a plan to construct King Salman’s bridge connecting Egypt and Saudi Arabia. Freely available potential field data, such as magnetic and gravity data, were integrated with seismological data from nearby seismic stations to understand the regional structure and seismic activity in the area. Potential field data were analysed using edge detection techniques (Tilt DeRivative and horizontal gradient) for qualitative interpretation and 2D inversion modelling for quantitative interpretation. Seismological data were analysed geostatistically to identify many epicentre locations and estimate the focal depths. The results of the potential field data analysis indicate that Tiran and Sanafir islands are located along a subsurface geological edge trending NW, parallel to the Red Sea. A similarity in potential field anomalies between both islands and the southern Sinai Peninsula indicates that these islands were separated from the Sinai Peninsula during the formation of the Gulf of Aqaba via Dead Sea Transform fault. The analysis of the seismic data indicates that a specific motion characterizes each focal depth solution. The seismic events are related to main structural trends NW–SE and NE–SW.

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Acknowledgements

This work was supported by the Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddah, under Grant no. (D-183-150-1437). The authors, therefore, gratefully acknowledge the DSR technical and financial support.

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Authors and Affiliations

  1. Faculty of Marine Sciences, King Abdulaziz University, Jeddah, Saudi Arabia

    Hamdy A. Aboulela & Rashad A. Bantan

  2. Geohazards Research Centre, King Abdulaziz University, Jeddah, Saudi Arabia

    Essam Aboud

  3. Faculty of Science, Suez Canal University, Ismailia, 41522, Egypt

    Hamdy A. Aboulela

  4. National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Cairo, 11421, Egypt

    Essam Aboud

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  1. Hamdy A. Aboulela
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  2. Essam Aboud
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  3. Rashad A. Bantan
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Correspondence to Essam Aboud.

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Aboulela, H.A., Aboud, E. & Bantan, R.A. Seismicity and major geologic structures of Tiran and Sanafir islands and their surroundings in the Red Sea. Environ Earth Sci 76, 793 (2017). https://doi.org/10.1007/s12665-017-7145-0

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