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Geothermal manifestations on Bangka Island are found in the villages of Terak, Pemali, Sungailiat/Pelawan, Dendang, Permis, and Nyelanding. The manifestation of hot water in Terak Village, Central Bangka Regency is in the form of 3 hot springs with a surface temperature of 55ᵒC this research is to be carried focus on the structure of the subsurface...
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Context 1
... this process, it applied spectral analysis using (Fourier Transformation and Gaussian Filtering) (Karunianto, Haryanto, Hikmatullah, & Laesanpura, 2017). Figure 2 represented CBA value in Terak geothermal system. CBA values in this area was 25.7 -31.8 mGal red to light contour represented moderate -high anomaliess (28.1 -31.8 mGal). ...
Context 2
... anomaly shown in light green to blue contour (25.5 -28.4 mGal). It was caused by the presence of fractures in the north-south and northwest-southeast. (Huenges, 2010). The high anomalies was found in the southern caused by rocks has a high density at Triassic-old Tanjung Genting Formation (Putri & Harianja, 2021). ...
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Citations
... Adanya batuan-batuan tersebut memicu timbulnya manifestasi panas bumi Terak. Berdasarkan penelitian [6], manifestasi panas bumi Terak yang berupa survei geologi dan geokimia menginformasikan bahwa adanya 3 titik air panas yang memiliki suhu permukaan 55ºC -61.8ºC. Sistem geothermal Bangka Tengah sendiri tersusun oleh batuan granit intrusif dari formasi Granit Klabat, lempung dan batupasir dari Formasi Tanjung Genting [7]. ...
... Sistem geothermal Bangka Tengah sendiri tersusun oleh batuan granit intrusif dari formasi Granit Klabat, lempung dan batupasir dari Formasi Tanjung Genting [7]. Anomali gravitasi memperlihatkan bahwa Struktur batuan bawah permukaan sistem panas bumi non-vulkanik di Desa Terak berupa batupasir, granit dan diorit [6]. Sistem geothermal dapat diidentifikasi menggunakan metode magnetotelurik [8] [9], gravity [6], [7], [10]. ...
... Anomali gravitasi memperlihatkan bahwa Struktur batuan bawah permukaan sistem panas bumi non-vulkanik di Desa Terak berupa batupasir, granit dan diorit [6]. Sistem geothermal dapat diidentifikasi menggunakan metode magnetotelurik [8] [9], gravity [6], [7], [10]. ...
Geothermal potential in Indonesia has various non volcanic geothermal sources, one of which is geothermal in the Terak Village area of Central Bangka. The geothermal geological structure of Terak is in the form of granite rocks with normal faults and horizontal faults or what is called the Pemali fault. The purpose of this research is to identify rock spreading on geothermal Terak based on magnetic anomaly. Magnetic data was processing by applied diurnal correction, IGRF correction, RTE (Reduce to the Equator) correction. Reginal dan residual anomaly was separation using upward continuation 350 m, 400 m, and 450 m. The result shown that rock spreading on geothermal Terak was consist by granite rock from Granite Klabat formation in north Mangkol Hill, sandstone from Tanjung Genting formation on West study area. Schist and phyllite was dominated on northeast and northwest area.
... So, physical characteristics of geothermal system is crucial study. It can be used to defict presence of geothermal system component such as reservoir, clay cap, heat source and geological structures that control the area [6] [7], [8]. Magnetotelluric (MT) method have a high sensitivity for identify of resistivity variation which delineate subsurface condition of [3], [9], [10]. ...
Cubadak area was located in depression zone of great Sumatra fault zone which affected by normal faults. Geothermal in this area was characterized by the appearance of hot springs type chloride-bicarbonate on Cubadak, Sawah Mudik and Talu. The manifestation temperature on this area is about 37,1° - 74,8° C. This study purpose to recontruct model of subsurface geothermal system in Cubadak area based on MT data. Model 1-D was processed by apply Bostick inversion and NLCG (Nonlinear Conjugate Gradient) for model 2-D. The result showed that lowest resistivity was on Southwest to Northeast research area. Highest resistivity spread at West to Northeast. Geothermal system was composed by caprock (2-10 ohm), reservoar (20-300 ohm) and heat source (>300 ohm).
... Struktur geologi dan densitas batuan pada sistem panas bumi dapat di identifikasi menggunakan metode gravity [6] [7] maupun metode Magnetotelurik [8]. Metode gravity melibatkan hukum newton yang dinyatakan oleh persamaan 1 berikut [9]: ...
... Nilai sebaran anomali yang rendah berada pada rentang 5,4 mGal sampai 7 mGal (warna unggu sampai biru). Anomali regional disebabkan oleh perbedaan densitas batuan pada daerah yang lebih dalam [6]. Nilai anomali tinggi dimungkinkan adanya batuan yang memiliki densitas dan ketebalan yang tinggi [19]. ...
... Anomali residual adalah anomali lokal yang disebabkan oleh sumber-sumber anomali gravitasi yang berada pada posisi dangkal [6]. Sebaran anomali residual dapat dilihat pada gambar 3(b). ...
Central Bangka is one area that has geothermal potential such as the Terak and Keretak area. These area have hot spring manifestation. Geothermal manifestations in Bangka is the type of non-volcanic radiogenic geothermal. Origin sources of this manifestation suspected from rocks run into the crack, folds and faults. The purpose of this study was to identify rock speading in geothermal area and it’s correlation between geothermal manifestation in Terak and Keretak. he data obtained from the TOPEX/Poseidon satellite is in the form of FAA (Free Air Anomaly) data. The data is then corrected using Burger correction and field correction. Spectral analysis was performed by Fourier transform with moving average filter. The results showed that Complete Bouger Anomaly has 13 mGal-39 mGal. Regional anomaly has 5,4 mGal - 9.8 mGal. Residual anomaly has 7 mGal sampai 29 mGal. There area was consist of intrusive granite rock from the Granite Klabat formation, clas and sandstone from Tanjung Genting Formation. Gravity anomaly shown Geothermal Terak and Keretak are composed of the same distribution of rock.
... Ekplorasi geothermal menggunakan metode geofisika sudah banyak dilakukan, siantaranya magnetotelurik [3], geolistrik [2], gravity [4]. Berdasarkan metode Geolistrik sebaran sumber air panas di daerah Nyelanding mengarah dari Barat ke Timurlaut dengan batu penyusunnya yaitu air tanah, batu lempung, batu lanau, batu pasir, kerikil kering, dan batu granit [5]. ...
... Pola sebaran anomali regional dapat dilihat pada Gambar 3, dimana variasi nilai anomali regional ditunjukkan dengan warna biru tua hingga ungu muda. Nilai anomali tinggi mengidentifikasikan bahwa batuan dasar pada daerah tersebut memiliki densitas yang cukup tinggi dibandingkan dengan batuan yang berada pada nilai anomali rendah [4]. ...
... Anomali residual merupakan anomali yang berhubungan dengan struktur lokal. Anomali residual menggambarkan distribusi kerpatan batuan dangkal [4]. Batuan yang terletak pada kedalaman dangkal umumnya memiliki nilai anomali yang bervariasi, hal tersebut disebabkan oleh batuan yang bervariasi. ...
Non-volcanic geothermal is a heat system that is not related to volcanism such as in Nyelanding and Permis areas. In previous studies, hot springs in the Nyelanding area were spread from West to Northeast, with the constituent rocks of sandstone, dry gravel and granite. In the Permis area, the manifestation is influenced by shear faults trending Northwest to Southeast and the geothermal source is granite. Therefore, this study was conducted to determine the strenght of local tectonic structures using the gravity method. The data used in this study are the FAA (Free Air Anomaly) and topography data obtained through the TOPEX website. The gravity anomaly is obtained by performing spectral analysis using the Fourier Transform and moving average filter. 2D modeling is performed using inverse modeling with the smoothness constraint equation. The result of this research is that the Permis and Nyelanding geothermal systems are controlled by local tectonic structures in the Northwest and Southeast of the study area, in the form of fractures (possibly faults) with a Northeast – Southwest direction
