IDENTIFYING GEOTHERMAL SYSTEM USING SURFACE TEMPERATURE DERIVED BY SATELLITE IMAGE AND GEOLOGICAL OBSERVATION IN GUNTUR-KAMOJANG VOLCANIC COMPLEX, WEST JAVA

• Main Author: Rahma Yoni, Dian
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/55369
• Institution: Institut Teknologi Bandung

The Guntur-Kamojang Volcano Complex is an active volcanic chain that has subsurface geothermal systems. The geothermal system is characterized by surface manifestations and thermal anomalies. To identify the geothermal system in the study area, a remote sensing approach and geological observation were carried out. The objective of this study is to analyze thermal anomalies related to the geothermal systems using ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) satellite imagery based on TIR (Thermal Infrared) subsystem and geological observation. The applied methods used in this study were composed of corrected-emissivity image temperature (T-em), corrected-vegetation correction image temperature (T-cveg), and DNMLST (Daytime and Nighttime Mean Land Surface Temperature). The three correction steps were used to eliminate the factors that influenced the detected temperature. The calculated surface temperature result has been evaluated with ground field measurements temperature. The result showed that T-cveg was the most concordance to the measured ground temperatures. The validated temperature (T-val) values in the study area were 10,7 – 34,4 ?. Surface thermal anomalies that relate to the geothermal system were detected at six zones. The three zones agreed to the surface manifestation and the others were new finding surface thermal anomalies. Thermal anomalies in Kamojang and Guntur have been detected as upflow zone from Kamojang geothermal system and Guntur geothermal system. The thermal anomaly in Tarogong is an outflow of Guntur geothermal system. The new finding surface anomalies were identified as a possibility of a hidden geothermal system characterized by high surface temperature without surface manifestation. Surface thermal anomaly from the geothermal system may relate to convection, conduction, and electromagnetic radiation processes through geological boundaries such as lithology contact and geological structures.