IDENTIFYING SUCCESSIVE ERUPTION OF GUNTUR VOLCANIC COMPLEX USING POLARIMETRIC SYNTHETIC APERTURE RADAR (POLSAR) AND MAGNETIC SUSCEPTIBILITY DATA

• Main Author: BAKKER ( NIM: 22014019), ERWIN
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/26980
• Institution: Institut Teknologi Bandung

<p align ="justify">Identifying distribution and stratigraphic of volcanic products are important not only for mitigating volcanic hazards, but also to know the characteristics of the successive eruptions. Guntur volcanic complex located in Garut, West Java, Indonesia, was selected as study area at Guntur Volcano complex because it includes one of the volcanoes active volcanoes in Indonesia that has not erupted with the last eruption in 1987, the volcanic activity still active, and adjacent to a fairly dense residential areas thus increasing the risk of disaster in the area. This study is aimed to identify distribution and succession of volcanic products based on their magnetic properties and backscattering signal of Polarimetric Synthetic Aperture Radar (PolSAR) data. The polarimetric decomposition method was used to identify the distribution of the volcanic products based on their scattering characteristics. Then, the field measurement using SM-30 susceptibility meter was performed to confirm the units of volcanic products and interpret their successions. According to the backscattering intensity and polarimetric decomposition method, we could identify fifteen times successive eruption that formed Guntur Volcano Complex and termed as Khuluk and Gumuk in Indonesian standard. Magnetic susceptibility value assert that value changes are magnetic susceptibility from each khuluk and gumuk. The changes are in line with the change of age rocks that is higher magnetic susceptibility value toward younger rocks, with highest of magnetic susceptibility value at Khuluk Guntur 30.2 x 10P-3P SI, while the lowest at Khuluk Meungpeuk 19.87 x 10P-3P SI. Thus, the combination of PolSAR image analysis and magnetic susceptibility rocks shows successive eruption of Guntur Volcanic Complex starts from Gumuk Windu, Gumuk Malang, Gumuk Pulus, Gumuk Putrri, Khuluk Meungpeuk, Gumuk Cakra, Gumuk Gandapura, Gumuk Putri, Gumuk Gajah, Gumuk Batususun, Khuluk Pasir Laku, Gumuk Agung, Gumuk Picung, Gumuk Pasir Malang, Gumuk Masigit, Khuluk Kabuyutan and Khuluk Guntur.<p align ="justify">