Mapping Geological and Geochemical Suitability to Determine Geothermal Favorability Using Spatial Analysis in the Ungaran Geothermal Field, Central Java, Indonesia
Keywords:
GIS, Spatial Analysis, Index Overlay, Geological, Geochemical, Suitability, Geothermal Favorability, Ungaran Geothermal FieldAbstract
The Ungaran Geothermal Field in Central Java, Indonesia, holds significant potential for geothermal energy exploration due to its volcanic origin and active geothermal manifestations, such as fumaroles, hot springs, and hydrothermal alteration zones. Additionally, its strategic location in one of Indonesia's dynamic and rapidly growing provinces, with a population exceeding 36 million in 2023 and thriving industrial development, underscores strong market potential for geothermal power plant (PLTP) development to meet the region’s high energy demand. This study utilizes Geographic Information System (GIS)-based spatial analysis to integrate six thematic layers—faults, volcanic domes, eruption sources, fumarole manifestations, hot springs, and hydrothermal alteration zones—collected through geological and geochemical surveys conducted by PT PLN (Persero) in 2019. Using the Index Overlay method, these layers were analyzed to assess geological and geochemical suitability for geothermal resource development. The results indicate that Gedongsongo and
Kendalisodo exhibit the highest suitability values, making them priority targets for further exploration. This approach demonstrates the effectiveness of GIS in integrating diverse datasets to enhance predictive accuracy, support strategic
exploration decision-making, and promote sustainable geothermal resource utilization in dynamic regions such as Central Java.
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