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All Journal Journal of Engineering and Technological Sciences JGE (Jurnal Geofisika Eksplorasi) Journal of Geoscience, Engineering, Environment, and Technology Journal of Science and Applicative Technology Buletin Sumber Daya Geologi

Juliarka, Bella Restu

Geology Research Group, Institut Teknologi Sumatera, Jalan Terusan Ryacudu, Way Huwi 35365, Lampung Selatan, Lampung

Author-ID : 1565172

Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics

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Articles

MODEL GAYABERAT 2D UNTUK MENGUNGKAP STRUKTUR GEOLOGI BAWAH PERMUKAAN PADA DAERAH PANAS BUMI NATAR: 2D CONCEPTUAL MODEL ON NATAR GEOTHERMAL SYSTEM BASED ON GRAVITY DATA Juliarka , Bella Restu; Iqbal, Mochamad
Buletin Sumber Daya Geologi Vol. 15 No. 1 (2020): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

The Natar geothermal field is located in Natar District, which is approximately 10 km north of Bandar Lampung, Lampung Province. This geothermal area is unique because the manifestation of hot springs that appear on the surface is in a relatively flat area. Geological observations on outcrops to determine the geological structure that control the hot springs are difficult to carry out due to limited rock outcrops, so geophysical methods are needed to interpret subsurface conditions such as gravity methods. The geology of the study area is covered by Lampung Formation consists of pyroclastic - volcaniclastic rocks with thickness reaching 200 m. The result of gravity data processing shows the value of Bouguer anomaly which ranges from 51.0 to 62.6 mGal. The interpretation of Bouguer's anomaly data shows five fault structures predominate northwest-southeast and north-south trend, which act as the water path discharge. This trend indicates that the geological structure in the study area is still related to the Great Sumatran Fault, which is also trending northwest-southeast. The 2D subsurface modeling is conducted by using Oasis Montaj software 8.4 produces three layers of rock density, namely a layer associated to the Lampung Formation with density of 1.9 g / cm3, and two layer basements with densities of 2.54 g / cm3 and 2.76 g / cm3 respectively, forming horst and graben like structures in the study area. Exploration drilling for further research is recommended to the west of the hot springs to confirm the subsurface model.

Hydrogeochemistry of Natar and Cisarua Hot springs in South Lampung, Indonesia Mochamad Iqbal; Bella Restu Juliarka; Wijayanti Ashuri; Bilal Al Farishi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 4 No. 3 (2019): JGEET Vol 04 No 03 : September (2019)
Publisher : UIR PRESS

Natar Hot Spring is one of the geothermal manifestations that is located in Lampung Province, Indonesia. About 6 km to the east, another hot spring appears with temperature around 40°C with neutral pH called Cisarua Hot Spring. The Natar Hot Spring itself having temperature 47-54°C with 6.23 pH. Based on the geologic map, the appearance of these hot spring is caused by Lampung-Panjang Fault which trending northwest-southeast. Morphology of the research area is showing a flat terrain topography which composed of Quaternary volcanic rock and metamorphic rock in the basement. The nearest volcano that expected to be the heat source of the geothermal system is the Quaternary extinct volcano called Mt. Betung which is located about 15 km to the southwest. The aim of the study is to analyze the geochemistry of the manifestations and calculate the reservoir temperature. Geochemistry analysis result shows both manifestations are bicarbonate which is formed as a steam-heated water or steam condensates. Geothermometer calculation shows that the geothermal reservoir has temperature 150-160°C with approximately 300 m in depth. All manifestations are originated from meteoric water according to stable isotope analysis D and δ18O data and interacting with carbonate-metamorphic rock beneath the surface based on 13C isotope value. A further geophysics study is needed to determine where the heat comes from.

INTERPRETASI GEOFISIKA BIDANG GELINCIR PALEO-ROCKSLIDE PARANGTRITIS Akroma Hidayatika; Suharno Suharno; Rahmi Mulyasari; Hesti Hesti; Bella Restu Juliarka
Jurnal Geofisika Eksplorasi Vol 6, No 2 (2020)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v6i2.75

Parangtritis has a rock fall hazard area with a medium to high level of risk. In Parangtritis, there was a large scale paleo-rockslide that involved more than 800 million m3 of rock mass with an area of 1500 m x 2700 m. This is a significant factor in changing the landscape. This research uses 9 Audio-MagnetoTelluric (AMT) primary data points. Using the distance between points 750 m within a 2 km x 2 km study area. The location focused on the western side of the paleo-landslide area in Parangtritis Village. Processing AMT data using the help of MT-INV and RockWorks software. The result of one-dimensional inversion consists of 3 layers. Indicates a low resistivity value (0-10 Ωm) interpreted as beach deposition and sand dune, medium resistivity (50 - 160 Ωm) for Wonosari limestone and high resistivity ( 170 Ωm) for Nglanggran andesite breccias. The average thickness of the first layer is 44 m and the second layer reaches 175 m. Based on the resistivity structure of the AMT data, the interpretation of the boundary contact between the Wonosari limestone and the Nglanggran andesite breccia can act as a slip field in a depth of about 250 m This field is a passive fault field controlled by the Girijati fault in the east of the study area.

Geothermal System in Parang Wedang, Yogyakarta, Indonesia Mochamad Iqbal; Bella Restu Juliarka
Journal of Engineering and Technological Sciences Vol. 54 No. 4 (2022)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2022.54.4.6

Geothermal manifestations in Parangtritis, Indonesia, known as Parang Wedang Hot Spring, indicate a geothermal system in the subsurface. This circumstance motivated our research to model the Parang Wedang geothermal system in order to determine its subsurface conditions. Geological mapping, the geophysical method, and geochemical analysis were integrated to produce a conceptual model of the Parang Wedang geothermal system. The study area consists of structural hills, karst hills, and eolian plains with andesite breccias, limestone, andesite, and sand deposits as lithological variations. The results of magnetic modeling indicate that the research area is associated with the presence of an andesite intrusion and shows a NE-SW trending geological structure that is thought to be a path for hydrothermal fluid to the surface. Geochemical analysis was performed at two hot springs with temperatures of 47 °C and 49 °C. Geothermometer calculation showed that the geothermal reservoir in Parang Wedang has a temperature of 100 to 120 °C, a depth of about 180 to 285 m, and can be classified as a low enthalpy geothermal system.

Analisis Kerapatan Kelurusan (Lineament Density) di Lapangan Panasbumi Suoh-Sekincau, Lampung Mochamad Iqbal; Bella Restu Juliarka
Journal of Science and Applicative Technology Vol 3 No 2 (2019): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Penelitian ini bertujuan untuk melakukan analisis kerapatan kelurusan di daerah penelitian yaitu di lapangan panasbumi Suoh-Sekincau yang terletak pada Kabupaten Lampung Barat Provinsi Lampung. Kerapatan kelurusan diproses dengan menggunakan citra satelit berupa digital elevation map (DEM) yang diunduh pada laman Badan Informasi Geospasial (BIG). Citra tersebut diolah dengan menggunakan perangkat lunak Geomatica dan Arcgis dan menghasilkan peta kerapatan kelurusan dengan berbagai kelompok nilai dari tinggi hingga rendah. Geologi daerah penelitian didominasi oleh batuan gunungapi (volkanik) dengan kelurusan dominan berarah baratlaut-tenggara dan merupakan bagian dari Sesar Besar Sumatera pada segmen Semangko. Morfologi daerah penelitian terdiri dari punggungan dan beberapa puncak gunung dengan adanya cekungan pull-apart pada Danau Suoh. Dari peta kerapatan kelurusan yang dihasilkan, pada sekitar Gunung Sekincau memiliki nilai yang tinggi dan diinterpretasikan bahwa daerah tersebut memiliki tingkat permeabilitas yang baik. Selain itu daerah di sekitar Danau Suoh juga memiliki nilai kerapatan yang tinggi. Daerah dengan densitas tinggi ini merupakan daerah yang baik sebagai daerah resapan panasbumi. Keywords: penginderaan jauh, panasbumi, Suoh-Sekincau, kerapatan kelurusan, Lampung

Co-Authors Akroma Hidayatika Bilal Al Farishi Hesti Hesti Iqbal, Mochamad Iqbal, Mochamad Mochamad Iqbal Rahmi Mulyasari Wijayanti Ashuri

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