Abstract
The Blawan-Ijen volcanic complex is located in Bondowoso regencies, East Java province. The complex is expected to have geothermal system which is indicated by the occurrence of Blawan hotspring, acid lake on Ijen Crater and alterations. In 2017, measurements of gravity and magnetic methods have been conducted for the first time through the PITTA 2017 program. In 2018, further measurements are carried out to infill the previous data in order to strengthen the interpretation results. There are 151 stations obtained from each method until 2018. In this study, gravity method is used to detect the contrast density of an anomalous body while magnetic method is applied to discover the location of demagnetization zone. This paper presents the integration of both methods in geothermal exploration to determine the geothermal prospect area. The result of CBA and residual gravity indicated the existence of high gravity anomaly in the center to the southwest of the study area. Moreover, after processing RTP on magnetic data, there is the presence of low magnetic anomaly usually associated with demagnetization zone. Generally, the overall results supported one each other and pointed out the occurrence of the geothermal prospect possibly around the center of the study area.
Highlights
It has been well known that geothermal is renewable and sustainable energy since its source is generated by the earth's core
Gravity method acquisition was conducted at Blawan-Ijen geothermal prospect area
The result of CBA and residual anomaly 2017 interprets the presence of high gravity anomaly in the northeast area which continues to southwest direction
Summary
It has been well known that geothermal is renewable and sustainable energy since its source is generated by the earth's core. Geothermal is a clean energy that does not require carbon-intensive fuel to operate power plant. Geothermal energy can support Indonesia’s target in achieving emission reduction of greenhouse gas (GHG) to 29 percent by 2030 [1]. Indonesia which located along the Pacific Ring of Fire is blessed with huge geothermal potential. One of the area is Blawan-Ijen in East Java. The occurrence of geothermal system was indicated by the existence of extremely acidic fumarole at Ijen crater and Blawan hotspring
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