Crustal thickness and structural pattern evaluation of Sinai Peninsula using three-dimensional density modeling with aeromagnetic and earthquake data

• Autorzy: Gaber Gaber M. , Saleh Salah , Toni Mostafa

Identyfikatory

DOI

10.1007/s11600-022-00744-4

• Języki publikacji: EN

Abstrakty

EN

The Sinai Peninsula is a subplate located between the African and Arabian plates. It is an important subplate in the world; however, this region is poorly understood because of the shortage of geophysical data. Thus, this study focuses on built a three-dimensional (3D) high-resolution forward model of the crustal thickness with a new tectonic model and structural evaluation of the Sinai Peninsula to understand this area tectonically and determine its lithospheric and crustal thicknesses. Qualitative and quantitative interpretations of Bouguer gravity, reduced-to-the-pole (RTP) aeromagnetic, and earthquake data are explained to achieve the goals of this study. Two-dimensional (2D) interactive sequential modeling of gravity data is performed along with some well-selected profiles with existing crustal layer depth points from previous works in the studied region. Seventeen 2D models are constructed and used to determine the basement, Conrad (lower crust boundary), and Moho (upper mantle boundary) depths and to build a 3D model. Accuracy of the 3D built model is evaluated by extracting observed, calculated, and residual gravity anomaly maps. The results show that the basement rocks appear on the surface in the South of Sinai and deepen (down to 4.5 km) toward the North. The Conrad surface varies approximately from 16 km (in the northeast and southwest of Sinai) to 22.8 km (in the southeast). The Moho surface depth (i.e., crustal thickness) varies approximately from 28.8 to 34.2 km, and it deepens toward the northeastern and southwestern parts of Sinai. A tentative basement structure map is constructed from the horizontal gradient (H-gradient) filter and the 3D Euler deconvolution of the Bouguer gravity and RTP aeromagnetic data. Correlation between the geological background of the study area and the obtained results suggests that the Sinai Peninsula is tectonically active, mainly in its southern portion due to the tectonic movements along the Gulf of Suez and the Gulf of Aqaba. The crustal thickness increases southward and thins northward.

Słowa kluczowe

EN

Sinai Peninsula; 3D density modeling; crustal thickness; Bouguer anomaly; aeromagnetic data; earthquake data

PL

Synaj; modelowanie gęstości 3D; grubość skorupy ziemskiej; anomalia Bouguera; dane aeromagnetyczne; dane dotyczące trzęsienia ziemi

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2022
• Tom: Vol. 70, no 2
• Strony: 639--657
• Opis fizyczny: Bibliogr. 60 poz.

Twórcy

autor

Gaber Gaber M.

• Geology Department, Faculty of Science, Helwan University, Ain Helwan, Cairo, Egypt

• https://orcid.org/0000-0001-9525-3075

autor

Saleh Salah

• National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Cairo, Egypt

autor

Toni Mostafa

• Geology Department, Faculty of Science, Helwan University, Ain Helwan, Cairo, Egypt

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Uwagi

PL

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).