Magnetotelluric Data Dimensionality Analysis of Bandung Basin Resistivity Models
Ihyaudin Hasbillah(a), Nurhasan(a*), Rafa Zahira Suhaila(a), Huwaida Badia Abidin(a), Nada Galuh Khalisa(a), Muhamad Zulfansyah Saepul Mutaqin(a), Gusti Muhammad Lucki Junursyah(b), Hidayat(b), Ahmad Setiawan(b) and Ordio Roeslan Wijaya(c)

(a)Earth Physics and Complex System Research Group, Department of Physics, Bandung Institute of Technology, Bandung, Indonesia
*nurhasan[at]itb.ac.id
(b)Geological Survey Center, Geological Agency, Ministry of Energy and Mineral Resources, Bandung, Indonesia
(c)Department of Geophysics, Padjadjaran University, Sumedang, Indonesia

Abstract

The complex structure of the Bandung Basin resulted from the tectonic activity of the Ancient Mount Sunda millions of years ago. To understand this complex structure, the Magnetotelluric (MT) method was applied at 31 stations to analyze the dimensionality and direction of the subsurface structures within the basin. The analysis results show tipper values of less than 3 degrees across the entire period range, indicating that the regional structure is predominantly two-dimensional (2D). The strike direction (Swift angle) varies with the period, reflecting changes in the geoelectric strike relative to depth. At short periods (shallow depths), the dominant structural direction is North-South (5 degrees). At long periods (greater depths), the structural direction shifts to Northwest-Southeast (317 degrees). This deep-seated strike orientation is parallel to the fault system in the northern Bandung Basin, which extends from East-Southeast to Northwest. This alignment indicates that the deep structures of the Bandung Basin are controlled by the regional fault system, whereas the shallow structures are more influenced by volcanic sedimentary lithology.

Keywords: Bandung Basin- Dimensionality- Magnetotelluric- Strike- Tipper

Topic: Earth Physics and Space Science