The results of deep magnetotelluric sounding for studying the Nha Trang - Tanh Linh fault

Vo Thanh Son; Le Huy Minh; Nguyen Hong Phuong; Guy Marquis; Nguyen Ha Thanh; Vu Dao Nam; Nguyen Ba Vinh; Dao Van Quyen; Nguyen Chien Thang; Nguyen Hong Viet

doi:10.15625/1859-3097/17/4B/13000

Author affiliations

Authors

Vo Thanh Son Institute of Geophysics, VAST, Vietnam
Le Huy Minh Institute of Geophysics, VAST, Vietnam
Nguyen Hong Phuong Institute of Geophysics, VAST, Vietnam
Guy Marquis Institute of Geophysics of Strasbourg, France
Nguyen Ha Thanh Institute of Geophysics, VAST, Vietnam
Vu Dao Nam Institute of Geophysics, VAST, Vietnam
Nguyen Ba Vinh Institute of Geophysics, VAST, Vietnam
Dao Van Quyen Institute of Geophysics, VAST, Vietnam
Nguyen Chien Thang Institute of Geophysics, VAST, Vietnam
Nguyen Hong Viet Graduate University of Science and Technology, VAST, Vietnam

DOI:

https://doi.org/10.15625/1859-3097/17/4B/13000

Keywords:

Magnetotelluric, 2D resistivity model, fault.

Abstract

The profile of deep magnetotelluric sounding (MT) from Duc Trong - Tuy Phong has been carried out in Lam Dong and Binh Thuan provinces. The length of the Duc Trong - Tuy Phong profile is about 80 km with 15 stations and the distance between the stations measures about 5 km. Two-dimensional MT inversion was used to find a resistivity model that fits the data. The 2D resistivity model allows determining position and development formation of the Nha Trang - Tanh Linh fault. This is the deep fault, which is showed by the boundaries of remarkable change of resistivity. In the near surface of the Earth (from ground to the depth of 6 km), the angle of inclination of this fault is about 60^o; in the next part, the direction of the Nha Trang - Tanh Linh faut is vertical. Geoelectrical section of the Nha Trang - Tanh Linh profile shows that the resistivity of mid-crust is higher than that of lower-crust and of upper-crust.

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