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"Pulau Sumatera memiliki potensi panas bumi terbesar di Indonesia yang tersebar di sepanjang zona subduksi antara lempeng Hindia-Australia dan lempeng Eurasia, salah satunya adalah lapangan geothermal ldquo;A rdquo;. Secara umum, litologi di wilayah penelitian didominasi oleh batuan vulkanik yang berumur kuarter dengan manifestasi berupa fumarol dan mata air panas. Struktur geologi berupa patahan dan pendugaan intrusi batuan yang diidentifikasi sebagai heat source menjadi target dalam penelitian ini. Metode penginderaan jauh dengan analisis Fault Fracture Density FFD dilakukan untuk mengidentifikasi gejala struktur patahan di permukaan yang berasosiasi dengan manifestasi dan metode gravitasi dengan analisis First Horizontal Derivative FHD dan Second Vertical Derrivative SVD dilakukan untuk mengidentifikasi patahan di bawah permukaan. Hasil dari penelitian ini menunjukkan bahwa kemunculan manifestasi berada pada zona FFD tinggi dengan kerapatan sebesar 4 km/km2. Analisis data FHD dan SVD dapat mengkonfirmasi patahan berarah Barat Daya-Timur Laut, Barat Laut-Tenggara, dan struktur kaldera dengan jenis patahan keseluruhan berupa patahan normal. Hasil inversi 3D gravitasi mengidentifikasi batuan clay cap memiliki densitas 2.015 gr/cc sampai 2.24 gr/cc, batuan reservoir memiliki densitas 2.3 gr/cc sampai 2.4 gr/cc dan batuan heat source memiliki densitas 2.5 gr/cc sampai 2/8 gr/cc. Zona upflow terletak di bagian Barat wilayah penelitian dengan suhu reservoir berkisar antara 200°C-220°C.

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Sumatra Island has the largest geothermal potential in Indonesia spread along the subduction zone between the Indies Australian plate and the Eurasian plate. ldquo A rdquo geothermal field is one of them. In general, lithology in the study area is dominated by quaternary volcanic rocks and it has some manifestations such as fumaroles and hot springs. This study is focus on identify the structure and intrusion that identified as a heat source.

Remote sensing methods with Fault Fracture Density FFD analysis were performed to identify symptoms of surface fractures associated with manifestations and gravity methods with First Horizontal Derivative FHD and Second Vertical Derivative SVD analyzes performed to identify subsurface fractures.

The results of this study indicate that the appearance of manifestation is in the high FFD zone with a density of 4 km km2. Analysis of FHD and SVD data can confirm the Southwest Northeast, Northwest Southeast fault, and caldera structure with the overall fracture type are normal fault.

The result of gravity 3D inversion identifies clay cap rock has density 2,015 gr cc to 2,24 gr cc, reservoir rock has density 2,3 gr cc to 2,4 gr cc and heat source rock has density 2.5 gr cc to 2 8 gr cc . The upflow zone is located in the west of the research area with reservoir temperatures ranging from 200°C 220°C."

"[ABSTRAKRawapening merupakan cekungan danau tektonik yang terjadi dari peristiwa tektonik gravitasi. Adanya struktur patahan dan lipatan yang terjadi akibat peristiwa tersebut juga menyebabkan terjadinya patahan akuifer sehingga muncul titik-titik mata air di DAS Rawapening. DAS Rawapening merupakan wilayah gunung api kerena sebagian besar jenis batuannya merupakan batuan vulkanik. Wilayah gunung api memiliki potensi besar dalam kemunculan mata air sehingga penelitian ini dilakukan untuk mengetahui persebaran mata air berdasarkan karakteristik fisik wilayah, debit, dan jenis mata airnya di DAS Rawapening.Analisis asosiasi dan deskriptif digunakan untuk menjelaskan keadaan mata air tersebut. Hasil studi menunjukkan bahwa sebagian besar mata air muncul pada ketinggian kurang dari 500 mdpl dengan kelerengan 2 – 8 %, berada pada formasi geologi fasies gunung api kwarter muda (Gkm), berada pada wilayah produktivitas akuifer setempat, dan penggunaan tanah sekitar adalah kebun/perkebunan. Jenis mata air didominasi oleh mata air rekahan (fracturesprings) atau yang biasa disebut dengan mata air umbul dengan debit rata – rata sebagian besar adalah 1 – 10 liter/detik.

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ABSTRACTRawapening is a tectonic lake basin that occurred from tectonic gravity process. That process formed structural faults and folds. The faults also fracturing the aquifer so there are many springs appear in Rawapening watershed. Rawapening watershed is categorized as a types of volcanic region because the geological formations mostly are volcanic rocks. Volcanic region has great potential in the emergence of springs so this study was conducted to determine the distribution of springs by physical characteristics of region, discharge, and types of springs. Descriptive and association analysis are used to describe the distribution of springs in Rawapening watershed. The results of the study showed that most of the springs appear at an altitude of less than 500 meters above sea level withslopes 2-8%, with geological formations is volcanic facies young crater, at the local aquifer productivity, and surrounding landuse is a garden/farm. Types of springs dominated by fracture springs with average discharge mostly is 1-10 liters/sec., Rawapening is a tectonic lake basin that occurred from tectonic gravity process.That process formed structural faults and folds. The faults also fracturing theaquifer so there are many springs appear in Rawapening watershed. Rawapeningwatershed is categorized as a types of volcanic region because the geologicalformations mostly are volcanic rocks. Volcanic region has great potential in theemergence of springs so this study was conducted to determine the distribution ofsprings by physical characteristics of region, discharge, and types of springs.Descriptive and association analysis are used to describe the distribution ofsprings in Rawapening watershed. The results of the study showed that most ofthe springs appear at an altitude of less than 500 meters above sea level withslopes 2-8%, with geological formations is volcanic facies young crater, at thelocal aquifer productivity, and surrounding landuse is a garden/farm. Types ofsprings dominated by fracture springs with average discharge mostly is 1-10liters/sec.]"