Abstract
Geothermal resource investigation by using multi geophysical observation was accomplished for Blawan-Ijen geothermal system. Geological and surface investigation found about 21 hot springs have been found in Blawan area with the surface temperature ranged from about 40 o C-55 o C. Based on resistivity and GPR data known that the underground seepage of hot water following the fault direction. This fault structure is identified based on the high distribution of microseismicity and thermal infrared remote sensing (TIR) analysis which associated with high land surface temperature (LST). Meanwhile, the heat source of Blawan - Ijen geothermal system are found in the southwest part based on high magnetic anomaly which represents the igneous rocks. All methods used shows the results indicating that Blawan-Ijen volcano complex is an interesting area for geothermal energy development and suitable for pilot project on regional development of volcano geothermal region.
Highlights
The Blawan-Ijen volcano complex, on the eastern tip of Java, occupies a 20 km wide caldera (Fig. 1) formed more than 50,000 years ago as a result of the collapse of the Ijen stratovolcano
Ijen volcano is a part of Sunda-Banda volcanic arc stretching from Sumatra to Banda, along 3,700 km which is known to contain a lot of metal ore deposits (Carlile and Mitchell, 1994) and geothermal prospect
The heat source of Blawan-Ijen geothermal system predicted to be in the southern part related with high magnetic anomaly, while reservoirs and hydrothermal alteration predicted to be between Blawan and Ijen crater related with the low magnetic anomaly
Summary
The Blawan-Ijen volcano complex, on the eastern tip of Java, occupies a 20 km wide caldera (Fig. 1) formed more than 50,000 years ago as a result of the collapse of the Ijen stratovolcano (van Hinsberg et al, 2010). Ijen volcano is a part of Sunda-Banda volcanic arc stretching from Sumatra to Banda, along 3,700 km which is known to contain a lot of metal ore deposits (Carlile and Mitchell, 1994) and geothermal prospect Pasqua and Massimo (2014) suggests the presence of a major fault trending East-West along 2 km. The presence of a geothermal system fault structures which are a permeable zone become a way for hot fluid flow out towards the ground as geothermal manifestations (Prabawa et al, 2013). The proposed study was designed to be an intial study of Blawan-Ijen geothermal prospect based on multi geophysical observations. Geolectric resistivity, GPR, microearthquake and remote sensing observations have been done to analysis the quality and quantity of geothermal prospect and geohazard in Blawan-Ijen area
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