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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 100 Documents
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KONTRIBUSI PENGAMATAN GEODESI MODERN DALAM MEMAHAMI DINAMIKA TEKTONIK DI INDONESIA: ESTIMASI KUTUB EULER LEMPENG MINOR SUNDA Dina Anggreni Sarsito; Susilo Susilo; Dhota Pradipta; Heri Andreas
Bulletin of Geology Vol 3 No 1 (2019): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2019.3.1.5

Abstract

Penentuan Kutub Euler Sesaat Resen pada saat ini adalah salah satu kontribusi bidang geodetik untuk penentuan geo-kinematik bumi menggunakan asumsi geometrik bola ideal. Parameter kutub Euler diestimasi berdasarkan perubahan kecepatan/ pergerakan minimal tiga stasiun GNSS-GPS yang terletak di zona rigid yang sama. Dengan menggunakan best fitting L2-Norm dari data observasi GNSS GPS pada tahun 1992-2017, hasil estimasi yang dihasilkan memberikan sensitivitas yang tidak homogen terhadap pola distribusi titik pengamatan. Residu absolut dari pengamatan terhadap hasil estimasi kecepatan kutub Euler akan menunjukkan keberadaan stasiun di dalam atau di luar zona rigid. Dengan menerapkan semua langkah yang disebutkan, nilai estimasi Kutub Euler Sesaat Resen dari blok mikro Sunda adalah di bawah 5mm/tahun untuk residu absolut dengan akurasi hingga 1mm/tahun, dengan demikian parameter ini dapat digunakan sebagai informasi geo-kinematik yang akurat. Kata kunci: Geodesi, Lempeng Minor, Sunda, Kutub Euler, L2-Norm Minimization
SUBMARINE LANDSLIDE IDENTIFICATION IN THE SOUTH OF LOMBOK STRAIT AND ITS HYPOTHETICAL GENERATED TSUNAMI: A PRELIMINARY STUDY Rizqi Valentra
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

Based on the bathymetry map of Lombok Strait, the seabed morphology in the south of Lombok Strait was primarily a submarine canyon where the depth profile change drastically from 400 m to 2000 m. In a closer look, there was one part of the canyon that has crowning scar with mounded sediment just below it. This feature was interpreted as a landslide deposit and it was discovered in the south part of Lombok Strait, around 24 km from the south-west of Nusa Penida, and 30 km from the center of Benoa Bay. The scar was found around depth 950 m. According to the area of the scar, the estimated volume of lost surface area was illustrated around the volume of Anak Krakatau landslide that generated tsunami in 2018. By assuming this landslide was also tsunamigenic, it will impact the coastal area that surrounding the sea which are the south of Bali Island and the south of Nusa Penida Island. In this preliminary study, a tsunami numerical model – COMCOT which adopts linear and non-linear Shallow Water Equation will be utilized to investigate the characteristics of the landslide-induced tsunami on the surrounding coastal area of south of Bali Island and the south of Nusa Penida Island.
LATERITISASI PADA KOMPLEKS MELANGE AREA WAILUKUM, KABUPATEN HALMAHERA TIMUR Aditya Rizki Ramadhan; Nurcahyo Indro Basuki; Bambang Priadi; Bronto Sutopo; Abdul Bari
Bulletin of Geology Vol 4 No 1 (2020): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

This research is prompted by the presence of laterite deposit from different lithology in Wailukum Area, Buli Districts, Eastern Halmahera Region The research area is part of PT. Antam UBPN North Maluku IUP. The coordinates of research area are 412.369-413.763 mT and 89.304-88.384 mU zone 52N, and with research area of 1,4 km2. This research’s objective is to determine the characteristics of laterites and bedrock in Wailukum area.. Data used in this research are DEM, LIDAR, field data and borehole data DEM and field data analysis are used to determine the topographic unit Field data analysis are used to make geological map and cross section. Geostatistical analysis on borehole data, consist of assay and drill log data (470 sample) are used to determine laterite deposit and bedrock characteristic. Based on petrography analysis, bedrock in Wailukum are serpentinite, moderately serpentinized orthopyroxenite and weakly serpentinized olivine gabbronorite. Melange complex in Wailukum consist of serpentinite, orthopiroxenite and olivine gabbronorite as a boudinage and surrounded by foliatd serpentinite as a matrix. This melange complex predicted as as result of a collisional event. Terniary SiO2-MgO-Fe2O3 diagram analysis shows that type of lateritization is dry laterites with silica deposition. Laterite deposit divided into limonite and saprolite. Topographic unit divided into hill slope and lowland basin. Landslide process in hillslope area causes thin laterite deposit. Lithology in hillslope area are divided into lithology with gabbro domination and lithology with serpentine domination. Lateritization in lithology with gabbro domination are poor lateritization and ore zone are not formed. Latertization in lithology with serpentine domination are good lateritization and ore zone are formed in saprolite and lower part of limonite. Ni is in nickeliferous serpentine which cause Ni has strong positive corellation with Co, Fe, MnO and Cr2O3. There is landslide accumulation in lowland basin.which cause thin laterite deposit and ore zone in limonite.
ANALISIS PERUBAHAN GARIS PANTAI AKIBAT PEMBANGUNAN JETTY DI WILAYAH PANTAI KARANGSONG, INDRAMAYU, INDONESIA Umar Abdurrahman; Nining Sari Ningsih; Totok Suprijo; Ayi Tarya
Bulletin of Geology Vol 5 No 2 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

A jetty at the river downstream area of the Prajagumiwang River, Karangsong Beach, Indramayu, West Java Province, Indonesia was constructed in 2005. The aim of the jetty construction is to prevent channel siltation as the shipping lanes in that region. The construction of the jetty has an impact on local fishing activities and shoreline change at Karangsong Beach. Satellite image data from Google Earth in 2001, 2008, 2009, 2013, 2014, 2015, 2016, 2017, and 2018 were used to calculate coastal area change and coastline change. The high water line is selected as a proxy for shoreline position to reduce the error related to tidal range in manual digitization. The results of the analysis qualitatively and quantitatively, shoreline changes which were previously dominated by erosion became dominated by accretion after jetty construction. The largest total coastal area and total shoreline change occurred between 2001 and 2008 with the values are 297,136 m2 and 13,897 m respectively. In the period between 2008 and 2009 coastal area changes and shoreline changes showing fluctuation value which decreases over time indicate coastal natural processes to reach the equilibrium condition after the construction of the jetty.
PENDEKATAN TERINTEGRASI DALAM PEMODELAN FASIES RESERVOIR D-10 STRUKTUR NKL, LAPANGAN SANGASANGA, CEKUNGAN KUTAI, INDONESIA Ferdi Rizal; Dwiharso Nugroho; Prihadi Sumintadireja
Bulletin of Geology Vol 7 No 3 (2023): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

70% dari total produksi minyak saat ini di Struktur NKL berasal dari reservoir D-10 yang terletak di sayap (flank) bagian timur, utara Antiklinorium Samarinda. Namun demikian, pengembangan reservoir ini mempunyai kendala dalam pemodelan fasies karena kurangnya sumur yang menembus di area flank dan tidak berkorelasi dengan reservoir D-10 bagian punggungan (crestal). Adanya kompartemen ini, terlihat dari posisi reservoir minyak flank berada dibawah kontak minyak-air dari reservoir di crestal dan tren evolusi tekanan terlihat berbeda antara crestal dan flank. Hal utama dan menjadi tahap awal pemodelan fasies yaitu analisis lingkungan pengendapan. Penelitian ini melakukan pendekatan terbaru yaitu memanfaatkan dan mensintesiskan lima data yaitu analisis biostratigrafi dari beberapa jenis fosil, litofasies dari log tali kawat, besar butir batupasir dari data cutting, struktur sedimen dan paleocurrent dari data dipmeter serta salinitas reservoir. Hasil sintesis ini dijadikan dasar pembuatan model fasies untuk dikorelasikan ke sumur sekitar dengan menggunakan konsep cyclothem. Setelah itu, pembuatan tren fasies dari peta Net to Gross yang dikontrol oleh anomali atribut seismik dan rasio lebar channel terhadap netsand. Dengan pendekatan baru yang lebih komprehensif ini, terbukti dapat menjawab permasalahan pada distribusi fasies reservoir D-10 dan tentunya menjadi input dalam pemodelan reservoir 3D dan perhitungan volume hidrokarbon yang lebih realistis.
STUDI GEOKIMIA BATUAN INDUK DAN PEMODELAN CEKUNGAN BLOK BERAU BARAT CEKUNGAN BERAU PAPUA BARAT Hendro Situmorang; Asep H. Kesumajana; Eddy A. Subroto
Bulletin of Geology Vol 2 No 2 (2018): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2018.2.2.5

Abstract

Eksplorasi pada Cekungan Berau telah dilakukan sejak 30 tahun yang lalu. Telah dilakukan pengeboran dengan target Formasi Kais, Formasi Kembelangan Bawah dan Formasi Tipuma. Beberapa sumur kering dan pada sumur Gunung-1 ditemukan penampakan minyak (oil show). Umumnya studi yang dilakukan pada cekungan ini adalah studi reservoar dan perangkap, sedangan geokimia dan pembentukan hidrokarbon jarang dilakukan. Analisis batuan induk telah dilakukan pada setiap formasi sumur Gunung-1. Formasi yang berpotensi menjadi batuan induk pada cekungan ini adalah Formasi Kembelangan Bawah pada umur Jura dan Formasi Tipuma pada umur Trias. Hasil dari korelasi biomarker sampel minyak berkorelasi positif dan menandakan minyak tersebut satu famili. Korelasi biomarker juga dilakukan pada sampel minyak dan Formasi Kembelangan Bawah. Keduanya berkorelasi positif dan material organiknya tersusun atas campuran yang diendapkan di lingkungan estuarin. Berdasarkan hasil pemodelan cekungan, pada saat ini Formasi Kembelangan Bawah pada sumur Gunung-1 berada pada kematangan matang akhir. Formasi ini memasuki tahap matang awal pada Kapur Akhir, matang puncak pada Paleosen Akhir dan matang akhir pada Eosen Tengah. Cekungan Berau telah memiliki sistem petroleum yang lengkap. Selain kelengkapan elemen sistem petroleum, waktu pembentukan element tersebut merupakan hal yang sangat penting. Perangkap (Antiklin Misool-Onin-Kumawa) terbentuk pada Miosen Akhir-Pliosen. Minyak tidak terakumulasi dengan baik pada perangkap tersebut karena minyak telah terbentuk pada Kapur akhir. Berdasarkan kematangannya Formasi Kembelangan Bawah masih berpotensi menghasilkan minyak namun Transformation Ratio sudah mencapai 100% pada Oligosen Awal sehingga batuan induk berhenti menghasilkan
Komposisi Fauna Vertebrata Holosen Awal di Situs Gua Panglima, Gunung Parung, Kalimantan Timur Benyamin Perwira Shidqi; Mohammad Ruly Fauzi; Mika Rizki Puspaningrum; Yan Rizal; Truman Simanjuntak
Bulletin of Geology Vol 6 No 1 (2022): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

Sari Gua panglima merupakan salah satu gua karst yang terletak di Gunung Parung, Kalimantan Timur, Indonesia. Penelitian arkeologi dilakukan dalam endapan lantai Gua Panglima yang dibagi menjadi 5 zona stratigrafi utama. Penelitian berfokus di kotak galian TP1 dan TP2 yang menghasilkan temuan sisa fauna vertebrata melimpah yang terdiri atas gigi, rahang, tulang utama, dan fragmen tulang lainnya. Analisis temuan vertebrata berupa identifikasi takson dan kuantifikasi temuan teridentifikasi (NISP) bertujuan untuk mengetahui himpunan fauna dan kondisi lingkungan di sekitar Gua Panglima. Sisa temuan vertebrata di Gua Panglima terdiri atas 8 kelompok besar takson yaitu Primata, Artiodactyla, Perrisodactyla, Carnivora, Rodentia, Reptilia, Pholidota, Chiroptera, dan Actinopterygii. Keseluruhan temuan diidentifikasi menjadi 38 takson yang terdiri atas tingkat famili hingga spesies. Temuan sisa fauna vertebrata berjumlah 8672 spesimen dengan total temuan teridentifikasi (NISP) berjumlah 2227 dan temuan tidak teridentikasi berjumlah 6445. Temuan terdiri atas elemen gigi berupa incisor, canine, premolar, dan molar (16,3% NISP, n = 360), elemen rahang berupa mandibula dan maxilla (5,5% NISP, n = 124), dan elemen tulang utama berupa antler, astragalus, calcaneus, carapace, carpal, caudal, costae, femur, humerus, metacarpal, metatarsal, oscoxa, pelvis, phalanges, plastron, radius, scapula, supraorbital, tibia, ulna, dan vertebrae (78,2% NISP, n = 1743). Temuan hasil penggalian Gua Panglima diperkirakan memiliki rentang umur kurang Holosen Awal – Tengah. Komposisi fauna pada Gua Panglima memiliki signifikansi secara kronologi dengan beberapa situs pada periode dan lokasi berdekatan seperti Gua Niah dan Pulau Palawan. Kemiripan komposisi fauna pada ketiga situs tersebut memberikan gambaran bagaimana perkembangan ekologi pada hutan hujan tropis Kalimantan yang relatif tidak terlalu berubah pada periode tersebut. Meskipun begitu, komposisi fauna pada temuan Gua Panglima tidak dapat dipisahkan dengan konteks hunian manusia prasejarah dengan ditemukannya artefak arkeologi lainnya. Abstract Panglima Cave is one of the karstic caves located in Parung Mountain, East Kalimantan, Indonesia. Archaeological research was conducted on the Panglima Cave sediment deposit that is divided into 5 main stratigraphic zones. This research focuses on unconsolidated sediment deposit from TP1 and TP2 box excavation that yields an abundant amount of vertebrate fossil remains including teeth, jaw, and other bones fragment. The analysis of fossil specimens for taxonomy identification and specimen quantification (NISP) is defined to comprehend fauna assemblage and its paleoenvironment. The collection reveals 8 main fauna groups which are composed of Primates, Artiodactyl, Perissodactyl, Carnivore, Rodent, Reptile, Pholidota, Chiroptera, and Actinopterygii. The whole identified fossil is comprised of 38 taxa that varied from family to species. Panglima Cave fossil remains had a total amount of 8672 specimens with 2227 of them being identified specimens (NISP) and the rest 6445 are unidentified specimens. Fossil element variations are consisting of teeth elements from incisor, canine, premolar, and molar (16,3% NISP, n = 360), jaw elements from mandible and maxilla (5,5% NISP, n = 124), and primary bone elements from antler, astragalus, calcaneus, carapace, carpal, caudal, costae, femur, humerus, metacarpal, metatarsal, oscoxa, pelvis, phalanges, plastron, radius, scapula, supraorbital, tibia, ulna, and vertebrae (78,2% NISP, n = 1743). Panglima cave deposits are estimated to have formed from to Early – Middle Holocene. The fauna composition has a chronological context from several archaeological and paleontological sites around Borneo Island, such as Niah Cave and Palawan Island. The similarity of fauna distribution from those three sites reflects the relatively constant ecological condition of Borneo tropical forest since the Late Pleistocene. However, the Panglima Cave fauna assemblage is indivisible with prehistory human occupancy as demonstrated by other archaeological findings on this site.
TEKNIK PENDETEKSIAN ZONA MATA AIR PANAS GEOTERMAL MENGGUNAKAN CITRA SATELIT MULTISENSOR DAN OBSERVASI LAPANGAN Lazuardy Fajar Pratama Sulaeman; Asep Saepuloh; Permana Adhitya Lano
Bulletin of Geology Vol 3 No 3 (2019): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2019.3.3.3

Abstract

Geothermal exploration activities in a very large area require a lot of time and manpower. A mapping technique can be used to minimize time and manpower at field by optimizing the use of remote sensing technology. This paper is aimed to identify the availability of geothermal hot springs zones using multisensory images from Landsat-8 Advanced Land Imager (OLI), Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Thermal Infrared Radiometer (TIR), and Synthetic Aperture Radar (SAR) of Sentinel-1. The imagery data were prepared and used according to their respective uses, and then they will be verified by field geological data including location of hot springs and geological structures. Baolan Subdistrict and Galang Subdistrict, Tolitoli District, Central Sulawesi Province was selected as study area to obtain the effectiveness of multisensory technique under thick vegetation cover and limited access. The geological mapping area was focused in the south of Tolitoli City with coverage area about 50 km2. Surface thermal anomaly detection was performed using ASTER TIR by calculating the Land Surface Temperature (LST) and combined with wetness detection using Landsat-8 OLI. In addition, the Sentinel-1 images were used to detect lineament related to geological structures on the surface served as fluid path flows from sub-surface to surface. Ground truthing was performed by mapping hot springs at field and served as verification to the remote sensing results. Then, geological interpretation of geothermal system availability under the study area was performed. The multisensory image analyses verified by field mapping of the hot springs zone showed high effectivity to localize the possible area for surface manifestations. Meanwhile, the lineament related to geological structures based on Sentinel-1 image detected successfully a sinistral strike slip and sinistral normal faults. Accordingly, the geothermal manifestation in the study area was a discharge zone presented by the existence of hot springs and strike-slip faults acted as fractures permeability
KAJIAN KETIDAKPASTIAN ESTIMASI CURAH HUJAN SATELIT TRMM STUDI KASUS: DAS CILIWUNG Muhammad Ridho Syahputra; Faiz Rohman Fajary; Edi Riawan; Rusmawan Suwarman; Hengki Eko Putra
Bulletin of Geology Vol 6 No 3 (2023): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

Dataset curah hujan (CH) dengan resolusi spasial dan temporal yang baik diperlukan oleh berbagai sektorseperti sektor manajemen sumber daya air dan bencana hidrologi. Namun, pengamatan CH secara langsung di permukaan seringkali tidak lengkap dan tidak merata. Sumber alternatif data CH lainnya dapat diperoleh dari estimasi CH oleh satelit (penginderaan jauh). Namun, estimasi satelit memiliki kesalahan dan ketidakpastian yang berpotensi mempengaruhi aplikasi selanjutnya yang menggunakan data hujan. Oleh karena itu, penting untuk mengukur ketidakpastian estimasi CH satelit untuk memberikan informasi tambahan bagi pengguna mengenai keandalan data. Pada penelitian ini telah dilakukan simulasi Monte Carlo untuk menghasilkan ensemble Dataset CH yang mampu mengkuantifikasi ketidakpastian produk estimasi CH TRMM (Tropical Rainfall Measuring Mission) 3B43v7. Dataset CH ensemble ini dapat digunakan untuk memberikan informasi tentang distribusi error dan estimasi peluang CH dari dari estimasi satelit TRMM. Dalam kajian ini juga ditunjukkan pemanfaatan dataset CH ensemble dalam mengkuantifikasi ketidakpastian dalam analisis CH ekstrim menggunakan pendekatan periode ulang dan Probable Maximum Precipitation (PMP).
REKONSTRUKSI PERUBAHAN SUHU PERMUKAAN LAUT BERDASARKAN KUMPULAN FORAMINIFERA DI PERAIRAN UTARA PAPUA, SAMUDRA PASIFIK Adrianus Damanik; Khoiril Anwar Maryunani; Septriono Hari Nugroho; Purna Sulastya Putra
Bulletin of Geology Vol 4 No 1 (2020): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

Foraminifera is one of the best proxies used to determine the condition of paleoecology such as to determine sea surface temperature. Sea surface temperature is one of the important ecology parameters to distinguish the oceanography characteristic in a waters/basin. In this study, reconstruction of sea surface temperature (SST) in the North Papua Waters was conducted based on planktonic foraminifera abundance. For this study, we analyzed gravity core with code OS-07 taken during the Nusa Manggala Expedition 2018. This area was chosen because it is one of the ITF entrances, as branch of the global circulation. Therefore, the North Papua Waters are considered recording global climate events. Modern Analogue Technique (MAT) and foraminiferal grouping following the work of Parker (1960) in Boltovskoy and Wright (1976) were applied to this study. The results of temperature analysis using the two methods show the same trend changes. At intervals of 246-88 cm trophic zone foraminifera is not dominant while the subtropic, transitional, and subantartic foraminifera groups are increasing which interpreted to be relatively lower temperature conditions. Foraminifera at 88-0 cm depth intervals, trophic foraminifera group is increasing and dominant, interpreted by relatively higher temperature conditions. These results are in line with the SST results based on MAT from the foraminifera data collection that shows that there were two SST trends, depths of 246-86 cm and 86-0 cm. The transition of two trend, at a depth of 86 cm, is interpreted as the boundary of Pleistocene to Holocene. The average temperature difference in February is 1.33oC cooler on Pleistocene compare to Holocene and in August is 0.82oC cooler on Pleistocene compare to Holocene.

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