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INDONESIA
IJOG : Indonesian Journal on Geoscience
Published by Geological Agency of Indonesia
ISSN : 23559314     EISSN : 23559306     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
The spirit to improve the journal to be more credible is increasing, and in 2012 it invited earth scientists in East and Southeast Asia as well as some western countries to join the journal for the editor positions in the Indonesia Journal of Geology. This is also to realize our present goal to internationalize the journal, The Indonesian Journal on Geoscience, which is open for papers of geology, geophysics, geochemistry, geodetics, geography, and soil science. This new born journal is expected to be published three times a year. As an international publication, of course it must all be written in an international language, in this case English. This adds difficulties to the effort to obtain good papers in English to publish although the credit points that an author will get are much higher.
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Articles 10 Documents
 1 
Search results for , issue "Vol. 10 No. 2 (2023)" : 10 Documents clear
Aliphatic Biomarker Signatures of Crude Oil from Tarakan Subbasin, Tarakan Basin, North Kalimantan, Indonesia Yulfi Zetra; R.Y. Perry Burhan; Maulida Fitriyyah; Zjahra Vianita Nugrahaeni
Indonesian Journal on Geoscience Vol. 10 No. 2 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.2.139-150

Abstract

Organic geochemical studies of crude oil from Pamusian Field, Tarakan Subbasin, Tarakan Basin, North Kalimantan, have been done. Biomarker aliphatic hydrocarbon fractions were identified using a combined gas chromatography-mass spectrometer (GC - MS). Identified biomarkers consist of n-alkane groups, isoprenoids, bicyclic sesquiterpenoids, and pentacyclic triterpenoids. The most abundant aliphatic hydrocarbon biomarker is pristane followed by n-C19. The existence of n-alkanes shows a homologous (n-C16- n-C30) with a unimodal distribution type. The abundance of n-C19 is higher than other n-alkanes, supported by LHCPI value of 2.03, as an indicator of organic matter derived from microbial organisms. The amount of long chain n-alkanes (n-C25- n-C30) is almost the same as medium chain n-alkanes (n-C19 - n-C24) indicating the source of organic compounds is not only from microbial organisms, but also from terrestrial higher plants. The presence of 8β (H)-drimane compounds together with homodrimane shows the presence of bacterial input on the formation of oil from organic compounds. Ratio of Pr/Ph is 3.76, ratio of drimane/homodrimane is 1.058, ratio of Pr/n-C17 is 34.41, and ratio of Ph/n-C18 is 16.02 indicating the source of organic compounds came from terrestrial higher plants deposited in the oxic environment, and disposed to increase biodegradation. The CPI value is 0.95, and the highest amount of 17α (H), 21β (H)-hopane compounds suggest that Tarakan Subbasin oil was mature, and the source of organic compounds was derived from bacteria Keywords: Tarakan Basin, organic geochemistry, aliphatic hydrocarbon fraction, CPI
Paleoseismic Analysis of the Walanae Fault Zone in South Sulawesi, Indonesia Asri Jaya; Osamu Nishikawa; Sahabuddin Jumadil
Indonesian Journal on Geoscience Vol. 10 No. 2 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.2.215-227

Abstract

The most seismogenic fault of South Sulawesi region is Walanae Fault, which has a moderate seismicity history with magnitudes ranging from Mw 4 to Mw 5. The largest earthquake occurred in 1997 with a magnitude of Mw 5.9. After the Donggala-Palu earthquake assailed Sulawesi Island in 2018, the fault in this region were reactivated, including the Walanae Fault system that has pair parallel faults, West Walanae Fault (WWF) and East Walanae Fault (EWF). This fault zone has a 150-km-long and 3-km-wide fault traces, and should have seismicity potential to produce larger earthquakes than the events measured to date. The resulting radiocarbon ages obtained from the dating of organic samples collected on two tranches along with the EWF support that the Walanae Fault zone has a longer earthquake history in the ranges of 4,000 BP (3,050 cal BP and 3,990 cal BP) and 100-300 AD (101 AD pMC and 340 cal BP). The results of age evidence suggest that the Walanae Fault system is an active fault, and must remain of concern as an earthquake source with potential hazards in the region, comprising the West Walanae Fault (WWF) and the East Walanae Fault (EWF). Both faults are separated by a narrow lowland area of Walanae Depression (25 km). The lowland area sandwiched by these two faults harboring a potential seismic amplification that might be generated by thick sediment filled the lowland. Keywords: seismicity, earthquake, radiocarbon dating, Walanae Fault
Assessment of Bedugul Geothermal Prospect Using A Numerical Reservoir Modeling Renaldio Jackli Keintjem; Heru Berian Pratama; Adrian Tawakal; Andrian Putra Wardana; Muhamad Ridwan Hamdani; Yuniar Zhafira Abdillah; Sutopo Sutopo
Indonesian Journal on Geoscience Vol. 10 No. 2 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.2.181-200

Abstract

A numerical modeling was carried out to generate a numerical model of the Bedugul geothermal field located in Bali Island, Indonesia. This study presents a natural state model and updates the conceptual model of Bedugul based on published geological, geophysical, geochemical, and well data. The numerical simulation of the Bedugul geothermal field has been developed using the previous conceptual model and well data. The Bedugul reservoir model is properly aligned with actual Pressure and Temperature well data. Thus, the natural state model is used to update the Bedugul conceptual model. The main updated points of the conceptual model were the location of the heat source to be beneath Mount Tapak, adding the flow fluid pattern as outflow and upflow location, caprock, reservoir, recharge, discharge, and adding iso-temperature distribution. Based on the numerical model result, the Bedugul geothermal field is a waterdominated geothermal system. The results of this model have been applied to the heat stored method with the Monte Carlo simulation to generate a probabilistic distribution of the reserve potential estimation. The probabilistic for P50 of probable and proven reserve estimation for thirty years are 136.3 MW and 33.4 MW, respectively. Keywords: Bedugul, numerical model, natural state, resource assessment, geothermal
Characterizing SO2 Emission Rate, Thermal Anomalies, from Opened and Closed Vent System at Agung, Bromo, and Sinabung Volcanoes in Indonesia Hilma Alfianti; Asep Saepuloh; Mamay Surmayadi; Syegi L. Kunrat; Ugan B. Saing; I.G.B. Eddy Sucipta; Sofyan Primulyana
Indonesian Journal on Geoscience Vol. 10 No. 2 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.2.277-295

Abstract

Agung, Bromo, and Sinabung Volcanoes have high volcanic activity over the last decade, and have different eruption characteristics. Hence, it would be fascinating to study the characteristics of their volcanic activity patterns based on SO2 emission rates and thermal anomaly correlated with the seismicity data. The SO2 emission rate measurement was carried out using the Differential Optical Absorption Spectroscopy (DOAS), and calculated based on SO 2 column density, distance of measurement, wind speed, and wind direction. In addition, SO2 emission was detected using Ozone Monitoring Instrument (OMI) images with daily global coverage. Thermal anomaly detection was performed using Advance Spaceborne Thermal Emission and Reflection Radiometer (ASTER) of Thermal Infrared (TIR) subsystem with high spatial resolution (90x90 m). ASTER TIR images were corrected for radiometric and thermal atmospheric. The emissivity and brightness temperature separation algorithm was applied to obtain surface temperature of Agung, Bromo, and Sinabung Volcanoes. All the data were correlated with the seismicity of each volcano. The SO2 emission rates correlate with the magma ascent to the shallow depth in an open system volcano (Bromo Volcano). In the closed-system volcanoes (early phase of Agung and Sinabung), SO2 emission was detected after the transition of closed to open system. Magmatic injection from the reservoir to the shallow depth was detected as thermal anomalies, such as in Agung Volcano. Whereas in Bromo Volcano, the thermal anomaly was insignificant since Bromo Volcano has an explosive eruption at a short period, so the ASTER image could not observe the thermal anomaly on the eruption time. Thermal anomaly pattern in Sinabung Volcano was the manifestation of new magmatic injection to the shallow depth. Therefore, their increase serves as indicators for the increasing magmatic activity prior to the eruptions. Keywords: SO2 emission rate, thermal anomaly, DOAS, OMI, ASTER, Open Vent, Closed Vent
Variation Parameters of The 2004 Indian Ocean Tsunami Model for Tsunami Prone Area Mapping in The Northern Part of Aceh Province Siti Rohaya Syifa; Abdi Jihad; Muksin Umar; Vrieslend Haris Banyunegoro; Andi Azhar Rusdin
Indonesian Journal on Geoscience Vol. 10 No. 2 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.2.167-179

Abstract

A total of ten tsunami events occurred in Aceh Province from 1991 to 2012. This condition confirms that AcehProvince is very vulnerable to tsunami hazards. In 2004, a tsunami occurred due to the activity of the subduction zone onthe west coast of Aceh with a magnitude of Mw 9.3. Since the 2004 tsunami, research on tsunamis has increased. The aimof this study is to reconstruct the 2004 tsunami models, to find out which models are suitable for the events of 2004. Thereare at least five models of earthquake source faults used for tsunami modeling in this study. The tsunami modeling wascarried out numerically using the Tohoku University’s Numerical Analysis Model Investigation (TUNAMI) programme.The maximum height obtained from the modeling is 58,05 m at the shoreline. The maximum height obtained from thebest model is 17,73 m on land. The M5 fault model produced a tsunami height model that best matches the observationresults validated by lowest RMS and highest correlation coefficient values Keywords: tsunami height, fault model, correlation coefficient, RMSE
Geospatial Tool-Based Geomorphological Mapping of The Lower Kulsi Basin, India Gitika Thakuriah
Indonesian Journal on Geoscience Vol. 10 No. 2 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.2.229-244

Abstract

Detailed geomorphological map of a region provides necessary information on landforms to understand the variations of surface and subsurface processes. Geomorphological maps prepared based on a combined geospatial and field-observation approach are preliminary data for precise, prompt, and efficient watershed-level planning. The Kulsi is a significant left-bank tributary of the Brahmaputra. It has potential for agricultural, land, and water resources, but the region needs to catch up due to frequent climatic-geomorphic hazards. Therefore, this article aims to prepare an object-oriented detailed geomorphological map using geospatial tools. High-resolution satellite images and a digital elevation model were used to generate the detailed geomorphological map of the studied area. The resultant map is verified with extensive fieldwork. The investigated basin is characterized by structural and denudation hills, anthropogenetic escarpment; pediment plain, older and young alluvial plain; active and older flood plain; islands and sandbar deposits, and highly sinuous river and natural and artificial surface waterbodies. The research can contribute to local governments' and communities' land and water resource development plans. Keywords: geomorphology, morphometry, satellite image, Geographic Information System
Mitigation Strategy of Disaster Based on Information Technology in Semarang City Rizky Muliani Dwi Ujianti; Mega Novita; Iffah Muflihati
Indonesian Journal on Geoscience Vol. 10 No. 2 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.2.201-214

Abstract

Semarang is a city located on the northern coast of the Java Sea which makes it becomes one of the cities threatened by tidal flooding. Besides tidal flood inundation, several other disasters occuring in Semarang include fires, fallen trees, floods, landslides, hurricanes, and collapsed houses. This study identified the disasters occurred in Semarang City from 2012 through 2021, as well as the strategies to cope with them in general, and specifically using information technology, namely Geographic Information System (GIS) maps. The data in this study were obtained from Regional Development Planning Board, Public Works Office, Central Bureau of Statistics (BPS), Semarang City Social Service, and several related stakeholders. Those data were, then, visualized on a GIS map. The findings indicated that one method of mitigation is the use of GIS maps of floods and landslides, as well as disaster mitigation through Semarang economy and government policies Keywords: Semarang, GIS, tidal, flooding, disaster, mitigation
Pacific-Gondwana Permo-Triassic Orogenic Belt with Lesser Overprinted Cenozoic Deformation, Eastern Bird Head Peninsula, West Papua, Indonesia Sukahar Eka Adi Saputra; Christopher L. Fergusson
Indonesian Journal on Geoscience Vol. 10 No. 2 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.2.119-138

Abstract

The Paleozoic to Early Mesozoic Pacific-facing active margin of East Gondwana has been shown to extend into the Kemum Block of northern Bird Head Peninsula (western New Guinea), and was associated with Mid Paleozoic orogenic deformation and Devonian to Triassic silicic magmatism and foreland basin deposition. In the Mawi Bay area of the eastern Bird Head Peninsula, the (?) Permian Mawi Complex is a multiply-deformed unit with a pre-Late Triassic D1 deformation formed in an Andean back-arc setting associated with active margin tectonism. The D1 deformation is characterized by recumbent, isoclinal to tight, north-northeast facing folds with an axial planar S1 cleavage formed at a low metamorphic grade, and predated the unconformably overlying Upper Triassic - Middle Jurassic Tipuma Formation. South of the Mawi Complex, the Mesozoic-Paleogene succession of the northern Lengguru Fold Belt is affected by north-northwest trending folds, cleavage, and most of the succession dips moderately to gently to the west-southwest. This deformation is reflected in the underlying Mawi Complex by northwest-trending D2 structures that have folded the D1 folds, and have steeply inclined open to gentle folds, some polyclinal folds, and fault-related folds. The structures in the northern Lengguru Fold Belt may have influenced The Pliocene to Quaternary Central Bird Head Monocline associated with the Kemum Block uplifting in the northern Bird Head Peninsula
Geospatial Analysis for Delta Evolution of Jeneberang River in Makassar, South Sulawesi, Indonesia Rohaya Langkoke
Indonesian Journal on Geoscience Vol. 10 No. 2 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.2.151-165

Abstract

This study aims to document and to elucidate the Jeneberang River delta evolution during 1922 -2022 by analyzing the transport of sediment in and out of the river through erosion and sedimentation. The method used is a geospatial analysis of the delta and river evolution using the Dutch map of 1922 and Landsat long-term data from 1972, 1981, 1991, 2000, 2010, 2020, and 2022 by dividing once every fifty to two years, so the delta pattern changes. The data collection was done by downloading data via Landsat, the data processing was simulated using ArcGIS software, and sedimentation and erosion were estimated. This study shows that the lowest sedimentation occurred in 2002 - 2004 with an area of 6.21 ha, and the highest one in 2004 - 2006 with an area of 34.99 ha. The lowest erosion occurred in 2014- 2016 with an area of 1.08 ha, and the highest in 2006 - 2008 with an area of 22.64 ha. The evolution of the delta occurred due to landform and river migrations. Landform migration occurs gradually starting with the direction of migration relative to the north to relative to the west resulting in the formation of a delta landform with an area of 5349.42 ha. Furthermore, the development of the landform no longer leads relatively north to west, but there is still sediment migration due to tides and sediment supply from rivers resulting in a delta landform with an area of 5586.56 ha. Then landform migration is derived from the river sedimentary supply stalled to the north because of water gate construction which caused the concentration of migration lead to the southern estuary. Tides then became a major factor in the migration, but were not as intensive as before with additional formation with an area of 5655.79 ha. The meandering changes or evolution of rivers occur naturally and are influenced by human activities. The emergence of changes is divided into five periods ranging from changes in the meandering direction to the south to the sedimentation and control of erosion with the construction of sluices and reclamation. Based on the study and by using the Galloway classification, Jeneberang delta is classified as an estuarine delta that is predominantly influenced by tides (tide-dominated) during its formation Keywords: Landsat imagery, delta evolution, Jeneberang River, tide-dominated, South Sulawesi
Magmatic Evolution and Plumbing System of Gede-Salak Volcano, Banten, Indonesia Muhammad Alfath Salvano Salni; Euis Tintin Yuningsih; Tsukasa Ohba
Indonesian Journal on Geoscience Vol. 10 No. 2 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.2.245-276

Abstract

The study of individual volcanoes in northwest Java has been largely overlooked. In this study, an investigation of the magma evolution and plumbing system of Gede-Salak Volcano was conducted. A geological survey determined the lava unit and volcanism. The whole-rock geochemistry is utilized to determine the magma type and evolution. Mineral chemistry based on microprobe analysis revealed the magmatic process and phenocryst origin. Geothermobarometry is employed to estimate the temperature and pressure. The volcanism comprised the eruption of lava flows, sector collapse, and the eruption of lava domes. The magma evolution consists of two magma types: type A (lava flow and peripheral dome) and type B (summit dome). The processes identified are amphibole fractionation, magma mixing, and crust assimilation. Phenocryst textures and chemistry implied open-system processes inthe plumbing system involving three magma series, namely the felsic, intermediate, and mafic series. Magma type A resulted from multiple mafic recharges on the felsic series, while type B resulted from the mixing of intermediate and mafic series. The felsic and intermediate phenocryst crystallization occurred at 933-948°C and 1010-1011°C in the mid-crust at 14 km to 17 km depth. Meanwhile, the mafic series reside in the lower crust at 21 km depth and of 1065-1087°C temperature. Keywords: Gede-Salak, magma evolution, magma plumbing, geothermobarometry, mineral chemistry

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