INTERPRETATION OF RESISTIVITY STRUCTURE IN THE PAPANDAYAN VOLCANO AREA BASED ON MAGNETOTELLURIC DATA

• Main Author: Maulana Adi Saputra, Anggi
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/62952
• Institution: Institut Teknologi Bandung

Indonesian geological formation contains abundant natural resources such as mineral and geothermal energy. However, it also causes the potential for natural disasters, namely earthquakes and volcanic eruptions. Papandayan Volcano is an active volcano located in Garut District, West Java, with several craters, i.e., Baru Crater, Mas Crater, Nangklak Crater, and Manuk Crater. Geophysical methods are needed to determine the subsurface structure in the Papandayan Volcano area. One of the geophysical methods that can be used is the magnetotelluric (MT) method. This passive method utilizes natural wave sources to determine subsurface electrical quantities. Data collection was carried out at six measurement points in the Papandayan Volcano area. The data was processed by plotting a rose diagram, phase tensor diagram, tipper, and 2D Occam’s inversion. The data produced a geoelectrical strike in the direction of NW-SE (northwest-southeast) with an angle of 317.5°. Analysis of the phase tensor diagram in 2D or 3D structure with dominant tipper direction of NE-SW (northeast-southwest) resulted almost parallel to the measuring trajectory. The resistivity cross-section was obtained from the 2D Occam’s inversion, which interpreted the layer with a resistivity of 1.2-7.2 ?m as clay rock and tuff, resistivity 300-660 ?m in the form of dolomite rock, resistivity 170-300 ?m in the form of lava rock or andesite, and the resistivity of 10.6-93 ?m in the form of basalt rock.