TWO-DIMENSIONAL INVERSION MODELLING ANALYSIS FOR SUBSURFACE INTERPRETATION OF TANGKUBAN PARAHU AREA BASED ON GRAVITY METHOD.

• Main Author: Akbar Amin, Akram
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/70338
• Institution: Institut Teknologi Bandung

The Tangkuban Parahu volcanic area is a geothermal prospect area in Bandung, West Java. The geothermal potential can be identified from the subsurface structure of the field. One of the geophysical methods that can be used in geothermal exploration is the gravity method. The ability of the gravity method to find values of rock density variations below the surface can be used to identify structures that control geothermal systems. In this research, the processing and interpretation of gravity data have been carried out with 42 measurement points. Gravity data processing is done by taking into account all correction factors to obtain the complete Bouguer anomaly value. Based on the interpretation of the complete Bouguer anomaly (CBA) contour map, it is determined that the information on the range of gravity anomaly values in the research data acquisition area is in the interval 370.7 mGal–391.8 mGal. The complete Bouguer anomaly map that has been obtained from field data processing is then subjected to a spectrum analysis process to determine the estimated depth and data filtering using the Butterworth filter to separate regional and residual anomalies. In addition, 2D inversion modeling is used to determine the distribution of gravitational anomalies, and 2D forward modeling is used to interpret subsurface structures in the study area. From the results of data interpretation, it can be concluded that the research area has geothermal potential. This is indicated by the presence of subsurface structures that show areas with low gravity anomaly values that are indicated as a potential source of geothermal heat located in the northeast and associated with the existence of geothermal manifestations around the research area in the form of Ciater hot springs.