MAGNETIC BASEMENT RELIEF MODELLING USING THE MAGB_INV PROGRAM IN SOUTH OF THE MAKASSAR STRAIT AREA
Indonesia is located between three large plate confluences: Indo-Australian, Eurasian, and Pacific. The activity of the three plates will affect the orientation and distribution of geological structures such as the formation of faults and basins. This research was conducted in the South of the Ma...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/73675 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Indonesia is located between three large plate confluences: Indo-Australian,
Eurasian, and Pacific. The activity of the three plates will affect the orientation and
distribution of geological structures such as the formation of faults and basins. This
research was conducted in the South of the Makassar Strait and covered two basins,
namely the Makassar Basin and the Spermonde Basin, which are passed by the
Makassar Basin Down Fault and the Spermonde Basin Horizontal Fault. The
magnetic method is used in research to provide magnetic modeling information in
the research area. This method works based on measuring variations in
susceptibility on the surface of the earth caused by differences in anomalies in the
surrounding area. The value of the natural magnetism of rocks can be used to map
magnetic basement relief. The data used in this study are magnetic anomaly data
obtained from the ESDM geoportal and bathymetry data from the study area. In
this research, magnetic basement relief modeling was carried out using the
MATLAB-based MagB_Inv program. This program is capable of processing large
amounts of data quickly and with high accuracy by calculating the inverse Fourier
transform. A high cut-filter is used in this program to avoid high-frequency
instability. The initial parameters that affect the final results of the study are
inclination and declination, magnetization contrast, selection of the wavenumber
range, and initial depth estimation. The initial depth estimation was obtained using
the Radially Average Power Spectrum (RAPS) method. The results of this study are
basement depths in the range of 5.5 km to 8.9 km. In accordance with the geological
conditions, it can be seen that there is a subsidence of the basement to the southeast
in 3D modeling caused by the Spermonde Basin Fault. |
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