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Bulletin of Geology
Published by Institut Teknologi Bandung
ISSN : 25800752     EISSN : 25800752     DOI : 10.5614/bull.geol.
Core Subject : Science, Engineering,
Earth & Planetary Sciences Energy Engineering
Bulletin of Geology is a research-based periodical scientific open access journal published by Faculty of Earth Sciences and Technology, Institut Teknologi Bandung (ITB). The published article in Bulletin of Geology covers all geoscience and technology fields including Geology, Geophysics, Geodesy, Meteorology, Oceanography, Petroleum, Mining, and Geography. The submitted abstract must be written in English and Bahasa Indonesia, but the article content is English or Bahasa Indonesia.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 5 Documents
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Search results for , issue "Vol 8 No 1 (2024): Bulletin of Geology Vol. 8 no. 1" : 5 Documents clear
STUDY OF CLIMATE CHANGE HAZARDS USING THE CLIMATE HAZARD INDEX IN INDONESIA Joko Wiratmo Wir; Ismail Robbani; Armi Susandi
Bulletin of Geology Vol 8 No 1 (2024): Bulletin of Geology Vol. 8 no. 1
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Climate change is a serious problem for the world. This impacts ecosystems and people in all parts of the world's continents and oceans and poses grave risks to human health, global food security and economic development. One of the steps to reduce climate change disasters is climate risk management. Climate Risk Index (CRI) is a quantitative calculation of many climate risks with thresholds specific to extreme weather and climate events that cause disasters. One of the stages in preparing the CRI is to determine a hazard valuation or Climate Hazard Index (CHI). Because the climatic conditions in Indonesia vary with rainfall, it is necessary to conduct a study to determine the CHI associated with this variable. In this study, climate hazards are defined as hazards that are directly related to the climate in Indonesia, namely rainfall. The hazard events studied are drought and extreme rain. Then the constituent components of the CHI studied are the drought index and the extreme rain index. This hazard study shows an increasing trend in each of the CHI constituent component indices with a very high frequency of hazard events occurring frequently from 1995 to 2021. June was the month that had the highest average CHI among other months throughout 1962 -2021. In terms of spatial patterns, CHI is extreme in the Indonesian region with local and equatorial rainfall patterns. Whereas in the monsoon pattern, CHI is in the medium-very low range. Furthermore, CHI can be influenced by several factors, one of which is forest land cover. The results show that when the loss of forest land cover increases, the CHI value and its component index will also increase in the short term.
LESSON LEARN OF GEOCHEMISTRY OF HYDROCARBON GASES AND CO2 IN MESOZOIC PETROLEUM SYSTEM OF PAPUA NEW GUINEA: IMPLICATION FOR THE FOLD BELT PLAY CONCEPT IN EASTERN PAPUA, INDONESIA Muhammad Saung Penggalih; Eddy Ariyono Subroto; Very Susanto
Bulletin of Geology Vol 8 No 1 (2024): Bulletin of Geology Vol. 8 no. 1
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract - The potential of oil and gas discovery at the Fold Belt Play concept in eastern Papua could be learned from the multiple production fields in Papua New Guinea Fault and Thrust Belt area which has similar geological condition. Therefore, the characteristic of geochemistry of hydrocarbon gases and CO2 at the Fold Belt Play concept is expected to be predictable by analogous of those gases occurrence in Mesozoic petroleum system of Papua New Guinea Fault and Thrust Belt area. The hydrocarbon gases are thermogenic origin, generated from Type II/III kerogen of Jurassic-Cretaceous source rock with gas maturity of about 1.2 to 2.0% Ro equivalent. The average CO2 percentage in Mesozoic reservoir at Papua New Guinea is ~1.58%. The relatively light d13C-CO2 (-25.2 to -10.4‰) unequivocally confirm that the low volume of CO2 is generated from kerogen maturation mechanism. For the Fold Belt Play concept in eastern Papua, the hydrocarbon gases are expected will have similar characteristic with the gases in Papua New Guinea. The low CO2 probably may only be found at Northern Fold Belt due to the preservation of thin-skinned deformation that have the basal detachment surface in the Kembelangan Group (Kopai Formation). In the other hand, at Central and Southern Fold Belt are predicted to contain moderate to high volume of inorganic CO2 migrated from Modio/Brug Dolomite.
IDENTIFY THE PATTERN OF URBAN GROWTH IN BANDUNG CITY USING GEOSPATIAL ANALYSIS Dwiputra Sam
Bulletin of Geology Vol 8 No 1 (2024): Bulletin of Geology Vol. 8 no. 1
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract. Land-use changes essentially are a side-effect of the growth of a city, which is commonly caused by urban developments. The spreading of urban developments on undeveloped land near a city (Urban Sprawl) may lead to a lack of urban planning, a lack of proper laws that regulate urban planning, and many other issues. To mitigate urban sprawl, the current study aims to determine the pattern of Bandung City's growth. The study focuses on the urban developments, that may have caused urban sprawl. The usage of time-series spatial data in an urban development analysis is typically used as the backbone of the study. Therefore, a 30 year dataset (1988-2018) is used to determine the pattern. The mean spatial method has been used to evaluate the dataset in Bandung City and the districts around the city. The method resulted in a pattern of movement resulting into the southwestern part of the city. Two points are also used to act as a pivot to determine the direction of the city's growth. The geometrical center of the study area and Gedung Sate were chosen as the pivot points. The direction of Bandung City’s growth based on the two pivot points resulted in the Southwest direction.
ORTHOMETRIC HEIGHT DETERMINATION IN JAKARTA AND SUNDA STRAIT AREA USING THE GEOPOTENTIAL NUMBER APPROACH Dina Anggreni Sarsito; Brian Bramanto; Heri Andreas; Dhota Pradipta; Sidiq Triwibowo
Bulletin of Geology Vol 8 No 1 (2024): Bulletin of Geology Vol. 8 no. 1
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

Orthometric height is a physical height type used by Indonesia in local/national reference systems for determining positions used in various scientific and engineering activities. The main constraint in determining orthometric height is that it is theoretically difficult to realize that gravity measurements must be carried out along the plumb lines that connect the topographic equipotential surface with the geoid surface. Another constraint is that it requires precise physical height difference measurements from tie points, which are usually located in coastal areas, to locations on land that are far from the coast. This research examines the possibility of determining orthometric physical height at several GNSS GPS stations in the Jakarta and Sunda Strait areas using the geopotential number approach as an alternative solution to the difficulties caused by the aforementioned constraints. The first type of orthometric height obtained from GNSS GPS geodetic height observations with geoid undulation obtained from the EGM2008 global gravity model is then used as a comparison for the second type of orthometric height obtained from the geopotential number approach. The pattern of geopotential numbers on the islands of Java and Sumatra has the same pattern, namely that the value increases as the topographic elevation increases. This phenomenon is in line with the terrestrial survey approach carried out so far, that the mean sea level can be assumed to be an estimate of the geoid surface, which is used as a reference for the gravity potential surface. The average difference in height between the two types of orthometric height is 0.39 meters, with a difference interval between -1.80 meters and 2.73 meters. The results obtained show that the geopotential number approach can be used as an alternative for determining orthometric height if direct gravity measurements and/or precise physical height difference measurements cannot be carried out in the monitoring area.
Karakteristik Hidrogeokimia dan Isotop Air Tanah di Pesisir Kota Balikpapan, Kalimantan Timur Irsyadulhaq Irsyadulhaq; Arifin Arifin; Agus Muhammad Ramdhan; Rima Rachmayani; Irwan Iskandar; Kemala Wijayanti
Bulletin of Geology Vol 8 No 1 (2024): Bulletin of Geology Vol. 8 no. 1
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

Daerah studi meliputi wilayah pesisir Kota Balikpapan yang memiliki jumlah penduduk sekitar 733 ribu, dengan persentase pemanfaatan air tanah untuk keperluan domestik diperkirakan sebesar 70%. Sebagai kota penyangga bagi Ibu Kota Nusantara (IKN), diperkirakan akan terjadi peningkatan jumlah penduduk di Balikpapan pada masa yang akan datang yang dapat berdampak terhadap meningkatnya jumlah pemanfaatan air tanah dan perubahan kualitas air tanah. Studi ini mengkaji karakteristik hidrogeokimia dan isotop air tanah, mengidentifikasi keberadaan dan penyebab fenomena intrusi air laut, serta merekonstruksi model konseptual hidrogeologi menggunakan data sampel air tanah, litologi, seismik, muka air tanah, dan pasang surut air laut. Hasil studi ini menunjukkan nilai Total Dissolved Solids (TDS) air tanah berkisar antara 141 – 11.023 mg/l dan pH sampel air tanah berkisar antara 4,49 hingga 9,29. Fasies air tanah terdiri dari mixed cation/HCO3-, Na+/Cl-, Na+/HCO3-, Ca2+/HCO3-, dan Na+/mixed anion. Komposisi isotop 18O dan 2H mengindikasikan evolusi kimia air tanah melalui proses evaporasi dan interaksi air tanah dengan batuan. Indikasi intrusi air laut ditemukan pada satu sampel air tanah (titik M-2.1) pada akuifer di kedalaman 30 – 33 m. Intrusi air laut tersebut diperkirakan terjadi secara alamiah. Perhitungan rasio pencampuran menunjukkan komposisi air tanah tawar sekitar 60% dan air laut sebesar 40%. Adapun model konseptual hidrogeologi di daerah studi menunjukkan perselingan batupasir dan batulempung atau perselingan akuifer dengan akuitar, dimana akuifer pada kedalaman 30 hingga 33 m di titik M-2.1 diinterpretasi terhubung dengan laut.

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