Study on structure of the Earth’s crust in Thua Thien-Hue province and adjacent areas by using gravity and magnetic data in combination

Pham Nam Hung; Cao Dinh Trong; Le Van Dung; Thai Anh Tuan; Mai Xuan Bach; Nguyen Anh Duong

doi:10.15625/1859-3097/19/4/14903

Author affiliations

Authors

Pham Nam Hung Institute of Geophysics, VAST, Vietnam
Cao Dinh Trong Institute of Geophysics, VAST, Vietnam
Le Van Dung Institute of Geophysics, VAST, Vietnam
Thai Anh Tuan Institute of Geophysics, VAST, Vietnam
Mai Xuan Bach Institute of Geophysics, VAST, Vietnam
Nguyen Anh Duong Institute of Geophysics, VAST, Vietnam

DOI:

https://doi.org/10.15625/1859-3097/19/4/14903

Keywords:

Gravity, magnetic, fault, the Earth’s crust, Thua Thien-Hue.

Abstract

This paper presents the structural characteristics of the Earth’s crust in Thua Thien-Hue province and adjacent area based on interpretation of gravity and magnetic data in combination. Research results have shown that: The depth of crystalline basement varies complicatedly, in the range of 0–11 km. The depth of Conrad surface increases from Northeast (12 km) to Southwest (18 km) and the depth of Moho surface is 23–34 km; The density of sedimentary layer changes from 2.61 g/cm³ to 2.65 g/cm³. Meanwhile, the density of granitic layer is in the range of 2.68–2.73 g/cm³. The basaltic layer has the density value of 2.88–2.93 g/cm³and the average density of lower layer of the Earth’s crust is about 3.30 g/cm³; The depth of second-order faults, Red River and A Luoi - Rao Quan, is through the Earth’s crust. Meanwhile, the depth of influence of third-order faults, Chay river, Dong Ha - Phu Vang, Vinh Linh, Hue - Son Tra and Tam Ky - Phuoc Son, is within the thickness of the Earth’s crust.

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