Abstract
The aims of this study is to describe the distribution of P wave velocity and S wave velocity value and Vp/Vs ratio based on microtremor HVSR method and its relationship with the appearance of hot spring at Sangubanyu Village. Geothermal manifestations in the Sangubanyu area are located in Bawang sub-district, Batang regency, and Plantungan sub-district, Kendal regency, Central Java province. HVSR method is used to process microtremor data which produces the dominant frequency value and amplification factor then do inversion on the H/V curve to get the value of the Vp and Vs. The results of the microtremor HVSR processing obtained the distribution of the dominant frequency values in the study area between 0.62 to 0.73 Hz and amplification factor values 1.09 to 1.39, the inversion results on the H/V curve obtained the distribution of Vp values between 131.76 m/s to 2181.19 m/s, Vs values between 76.61 to 1129.42 m/s, Vp/Vs ratio 1.64 – 3.35. Based on the results of the analysis and wave velocity interpretation, the subsurface structure of manifestation area of Sangubanyu is composed of tuffaceous sandstone and volcanic breccia, the normal faults with southern blocks relatively downthrown, that cause the appearance of hot springs.
Highlights
Geothermal energy is renewable and sustainable energy, environmentally friendly compared to fossil energy resources
Geothermal energy can be utilized directly and indirectly, for example, direct use is for tourism activities, agribusiness, industry, and other activities that use geothermal energy for direct use, while indirect use is for electricity generation, depending on the amount of temperature contained
The aims of this study are to describe the distribution of P wave velocity (Vp) and S wave velocity (Vs) value and Vp/Vs ratio based on microtremor HVSR method and its relationship with the appearance of hot spring at Sangubanyu Village so that recommendations for utilization can be determined
Summary
Geothermal energy is renewable and sustainable energy, environmentally friendly compared to fossil energy resources. Geothermal energy can be utilized directly and indirectly, for example, direct use is for tourism activities, agribusiness, industry, and other activities that use geothermal energy for direct use, while indirect use is for electricity generation, depending on the amount of temperature contained. Indonesia has a huge of geothermal potential in the world which is 29.4 GWe equivalents to 40% of the world's geothermal potential but its utilization is still very small, less than 5% of the total potential [1]. Subsurface heat source is often indicated by surface manifestations, such as hot springs, mud pools, geysers, and other geothermal manifestations. Geothermal manifestations on the surface are estimated to occur due to the propagation of heat from the subsurface or caused by fractures that allow geothermal fluid (steam and hot water) to flow to the surface [2].
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