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KARAKTERISTIK MORFOMETRI DAN MORFOTEKTONIK DAS CIBEET SEGMEN SELAAWI GIRIJAYA DAN DAS CIKUNDUL SEGMEN CIBADAK MAJALAYA, KABUPATEN CIANJUR, PROVINSI JAWA BARAT Anfasha, Arifin; Pranantya, Pulung Arya; Sukiyah, Emi
Bulletin of Scientific Contribution Vol 14, No 2 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (930.077 KB) | DOI: 10.24198/bsc.v14i2.9807

Abstract

West Java is an area that has a high vulnerability to disasters, the condition is influenced by a complex geological structure so prone to geological disasters, and faults can be studied by morphotectonic study approach. With morphometric analysis were used to identify the character of the shape of a region and its relation to the level of tectonic activity. Comparison of morphotectonic aspects of the Quaternary and Tertiary age rocks will involve active tectonic processes in it. Research carried out by three methods, namely studio methods with data measuring of straightness of the ridge and valleys, Rb, Dd, and Smf, field methods by means of geological mapping data retrieval strike / dip, fractures, megascopic descriptions of rock, image capture of the field, laboratory methods by analyzing fracture data and verification of field data with the data link between the studio and the activeness of faults in the study area. The activeness of fault and other geomorphological parameters can be determined by a variety of morphotectonic approaches, morphotectonic parameters such as Rb, Dd, Smf and straightness of ridge and valleys has become a reference in determining the activeness. The geological structure in the area of research are in form of faults and  fractures, which relatively trending northwest - southeast. Fault is evidenced by their straightness of DEM image as well as fracture data  found in the field.   Keyword : Morphometry, Morphotectonic, Watershed, Active tectonic, DEM Jawa Barat merupakan salah satu wilayah yang memiliki kerawanan bencana tinggi, kondisi ini dipengaruhi oleh tatanan geologi yang kompleks sehingga rawan dengan bencana geologi, sesar dapat diketahui dengan pendekatan studi morfotektonik. Dengan cara analisis morfometri digunakan untuk mengidentifikasi karakter bentuk suatu wilayah dan kaitannya dengan tingkat aktivitas tektonik. Perbandingan aspek-aspek morfotektonik pada batuan berumur Kuarter dan Tersier akan melibatkan proses tektonik aktif di dalamnya. Penelitian dilakukan dengan  tiga metode yaitu metode studio dengan pengukuran data kelurusan punggungan, lembahan, Rb, Dd dan Smf, metode lapangan dengan cara pemetaan geologi pengambilan data strike/dip,kekar,deskripsi batuan secara megaskopis, pengambilan foto lapangan, metode laboratorium dengan menganalisi data kekar dan mengintervetasi pembuktian data lapangan dengan data studio dan adanya keterkaitan antara keaktifan sesar di wilayah penelitian. Keaktifan sesar dan parameter geomorfologi dapat diketahui dengan berbagai pendekatan morfotektonik, Parameter morfotektonik seperti Rb, Dd, Smf dan Kelurusan tersebut menjadi acuan dalam menentukan keaktifan. Struktur geologi di daerah penelitian berupa kekar dan sesar yang berarah relatif barat laut – tenggara. Sesar tersebut dibuktikan oleh adanya kelurusan dari citra DEM serta data kekar yang ditemukan dilapangan.Kata kunci : Morfometri, Morfotektonik, DAS, Tektonik aktif, DEM
LITOFASIES ENDAPAN KUARTER DI WILAYAH DKI JAKARTA Listyono, Girlly Marchlina; Arfiansyah, Kurnia; Natasia, Nanda; Alfadli, Muhammad Kurniawan; Pranantya, Pulung Arya
Bulletin of Scientific Contribution Vol 14, No 1 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (798.933 KB) | DOI: 10.24198/bsc.v14i1.9803

Abstract

Bay of Jakarta is covered of Qartenary deposits with terrestrial deposits intercalation with marine deposits. Interaction between those depositional environment produce deposits which have lithofacies variation. Rapid development of Jakarta impact on impossibility in finding outcrop. This research gives changes for detailed Quarternary deposit lithofacies study through 22 wells with depth range about 120-450 metres and depth total 6.556,61 metres. Terrestrial deposit characterized by domination of relatively coarse clastics and content of remaining roots, woods, plants, high content of quartz, lithic fragment, calcareous and oxidated appearace. Marine deposit characterized by finer clastics, contain remain of shells, fosil, coral, limestone fragments, glauconites, calcareous. The lithofacies variation of Quartenary depost from the wells indicate lateral and vertical variation change, also on coastline shifting either by transgression or regression.       Keywords : deposits, Jakarta, quartenary, sediment Jakarta merupakan daerah teluk yang tersusun oleh endapan kuarter dengan karakteristik litologi yang beragam. Sedimen penyusun endapan kuarter Jakarta dipengaruhi oleh proses sedimentasi lingkungan pengendapan darat dan laut. Interaksi antara dua lingkungan pengendapan tersebut menghasilkan endapan yang memiliki variasi litofasies. Dengan pesatnya pembangunan di Jakarta menjadikan kesempatan untuk melihat singkapan sangat kecil. Penelitian ini memberikan kesempatan untuk melihat litofasies endapan kuarter Jakarta dengan lebih jelas melalui 22 sumur bor dengan kedalaman berkisar 120 – 450 meter dan total tebal 6.556,61 meter. Endapan darat dicirikan oleh dominansi klastika yang relatif kasar dan kandungan sisa akar, kayu, tumbuhan, kaya butiran kuarsa, fragmen litik, kerikilan, serta sifat karbonatan dan kenampakan teroksidasi. Batas antara keduanya sepanjang periode Kuarter memperlihatkan variasi secara vertikal dan lateral dan perubahan garis pantai baik transgresi maupun regresi. Kata Kunci : endapan, Jakarta, kuarter, sedimen
KUALITAS BATUGAMPING BERDASARKAN ANALISIS KLASIFIKASI GEOMEKANIK DI GOA SEROPAN, GUNUNG KIDUL, YOGYAKARTA Nugroho, Bani; Pranantya, Pulung Arya; Utomo, Edi Prasetyo
Bulletin of Scientific Contribution Vol 14, No 1 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1136.284 KB) | DOI: 10.24198/bsc.v14i1.9792

Abstract

Seropan cave is one of the caves in Semanu sub District, located in the karst region, Gunung Kidul, Yogyakarta. Based on reserach of Karlsruhe Institut of Teknology (KIT) German, is known underground river in the cave is very potential to be developed. Underground dams and micro hydro installations built to pump water upwards the river. These are used as raw water for daily needs and irrigation in the surface.  For this purpose it is necessary to study the stability of the rock mass in the cave Seropan. The stability of a tunnel or cave is heavily influenced by geological and non-geological factors. The most dominant geological factors in general are geological structures, can be muscular or fault, the type of rock and rock mass quality.The rocks at the cave Seropan in general are limestones. Based on rock mass classification of Rock Mass Rating (Bieniawski, 1989) otherwise known as the geomechanics classification, these rocks are included in class III and class IV. These rocks include moderate to bad quality. Until now the cave conditions remained relatively stable and secure. This is due to the naturally formed cave. The process of distribution of stresses around the cave coincided with the formation of caves and takes place in a relatively long time. However, in some parts of the cave should be because the effect of fractures can lead to collapse of the roof of the cave.
Evaluation of groundwater quality in Palu-Sigi Biromaru post-liquefaction, Central Sulawesi, Indonesia Afandi, Moh Fahri; Wilopo, Wahyu; Pranantya, Pulung Arya
Journal of Degraded and Mining Lands Management Vol. 12 No. 5 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2025.125.9041

Abstract

The liquefaction phenomenon on September 28, 2018, in Palu, particularly in Petobo and Jono Oge, caused severe damage and disrupted the shallow aquifer system. This study compared groundwater quality in the non-liquefaction area and the liquefaction area before and after the 2018 earthquake in South Palu and Sigi Biromaru, Central Sulawesi, Indonesia. The data were collected through field and laboratory analyses in 2025 and secondary data in 2018, before the earthquake, from previous researchers. The parameters of groundwater, including physicochemical properties, major ions, stable isotopes (?¹?O-?²H), and E. coli. The results show that non-liquefaction areas remained stable, characterized by Ca-HCO? facies and isotopes close to LMWL, which reflect local meteoric recharge. In contrast, post-liquefaction areas exhibited significant increases in Na?, Cl?, SO?²?, and NO?? along with high content of E. coli bacteria, resulting from a combination of geological processes and anthropogenic activities. Liquefaction also causes land degradation due to the loss of the soil's humus layer, as well as soil pollution from the remains of building materials that collapse during the liquefaction process. These findings confirm that liquefaction accelerates ion mobilization, increases the biological vulnerability of aquifers, and reduces soil quality.