remote sensing Article Crustal Structure of the Nile Delta: Interpretation of Seismic-Constrained Satellite-Based Gravity Data Soha Hassan 1,2, Mohamed Sultan 1,*, Mohamed Sobh 2,3, Mohamed S. Elhebiry 1,4 , Khaled Zahran 2, Abdelaziz Abdeldayem 5, Elsayed Issawy 2 and Samir Kamh 5 1 Department of Geological and Environmental Sciences, Western Michigan University, Kalamazoo, MI 49009, USA;
[email protected] (S.H.);
[email protected] (M.S.E.) 2 Department of Earth-Geodynamics, National Research Institute of Astronomy and Geophysics (NRIAG), Helwan 11421, Egypt;
[email protected] (M.S.);
[email protected] (K.Z.);
[email protected] (E.I.) 3 Institute of Geophysics and Geoinformatics, TU Bergakademie Freiberg, 09596 Freiberg, Germany 4 Department of Geology, Al-Azhar University, Cairo 11884, Egypt 5 Department of Geology, Tanta University, Tanta 31527, Egypt;
[email protected] (A.A.);
[email protected] (S.K.) * Correspondence:
[email protected] Abstract: Interpretations of the tectonic setting of the Nile Delta of Egypt and its offshore extension are challenged by the thick sedimentary cover that conceals the underlying structures and by the paucity of deep seismic data and boreholes. A crustal thickness model, constrained by available seismic and geological data, was constructed for the Nile Delta by inversion of satellite gravity data (GOCO06s), and a two-dimensional (2D) forward density model was generated along the Delta’s entire length. Modelling results reveal the following: (1) the Nile Delta is formed of two distinctive Citation: Hassan, S.; Sultan, M.; crustal units: the Southern Delta Block (SDB) and the Northern Delta Basin (NDB) separated by a Sobh, M.; Elhebiry, M.S.; Zahran, K.; hinge zone, a feature widely reported from passive margin settings; (2) the SDB is characterized by an Abdeldayem, A.; Issawy, E.; Kamh, S.