12 research outputs found
Determination Hypocentre and Focal Mechanism Earthquake of Oct 31, 2016 in Bone, South Sulawesi
No full text
Subsurface Profile Analysis for Aquifer Layer Identification: Analisis Profil Bawah Permukaan untuk Identifikasi Lapisan Pembawa Air
No full textBungaiya village is a village located in Gowa Regency which has volcanic rock lithology with one of the problems faced in volcanic rocks is that the rock porosity is small so that this layer cannot be an aquifer zone. But the water needs needed by the community for agriculture are very large. Geoelectric is a geophysical method that can be used to describe subsurface profiles, especially aquifer layers. The purpose of this study is to interpret using the geoelectric resistivity method, is the Wenner configuration method as many as 2 lines with a length of 470 m and a space of 10 m. The interpretation results on Line 1, there are 3 layers, are volcanic breccia with resistivity values of 85.6 – 2.2013.19 Ωm and depths between 1.2 – 68 m, layer 2 of tuff with resistivity values of 9.82 – 59.68 Ωm, depth of 12 – 76 m and the third layer is a volcanic breccia, resistivity value is 85.6 – 176 Ωm. Line 2 has 2 layers, are the first layer with a depth of 1.2 – 42 m with a resistivity value of 93 – 490.41 Ωm which is a volcanic breccia. The second layer at a depth of 1.2 – 78.8 m with a resistivity value of 30.9 – 77, 67 Ωm is tuff. Layers 1 and 2 show a similar subsurface profile. Based on these results, it can be concluded that the layer that functions as a water-carrying layer is tuff with a resistivity value of 9.82 – 77.67 Ωm
KARAKTERISASI SERPIH PADA FORMASI TALANGAKAR SEBAGAI POTENSI SHALE HYDROCARBON
No full textEksplorasi dan eksploitasi di Indonesia saat ini masih terfokus pada energi konvensional hidrokarbon dibandingkan energi nonkonvensional hidrokarbon seperti gas serpih. Gas serpih adalah salah satu energi nonkonvensional yang kaya material organic dan mencapai kematangan, pada kondisi dan tipe tertentu mampu berfungsi sebagai reservoir minyak dan gas. Jendela awal kematangan pada kedalaman 1200-2200 m dan kategori tipe kerogen II/III menghasilkan minyak dan gas
ANALISIS POTENSI SUMBER DAYA BATUGAMPING DI KAWASAN KARST DESA SAMANGKI, KABUPATEN MAROS, SULAWESI SELATAN
No full textResearch has been carried out in Samangki Village which aims to analyze the potential of limestone resources using the Geoelectrical Resistivity Method with the Wenner-Schlumberger configuration. Data were collected at 801904.40-802051.05 NE and 9440758.03-9440548.93 SW for 3 lines along 120 m with 10 m electrode space in a track. Acquired data were processed using Microsoft Excel, Notepad, RES2DINV, ArcGIS, and Google Earth applications to produce resistivity cross-sections and other supporting maps. Based on data interpretation, it shows that the low resistivity zone is an alluvium deposit (Qac) with resistivity value of 17.58 to 170 Ωm; and the high resistivity zone indicates the presence of limestone which is part of the Tonasa Formation (Temt). The presence of limestone on line-1 with resistivity value of 326.00 to 931.90 Ωm at position(x) 60 to 90 m, in depth(y) 1.25 to 9.26 m as shallow area, and at position 40-45 m in depth 16 to 19.8 m as the deepest area. Then the limestone on line-2 is indicated as a subsurface karst tower with a resistivity value of 462.00 to 809.36 Ωm at position 30 to 50 m in depth 1.25 to 19.8 m. Limestone also located on the northeastern edge of line-3 with resistivity values of 431.00 to 739.66 Ωm at a position of 12.5 to 17.5 m in depth of 1.25 to 6.38 m. It proves that Samangki Village has large potential for limestone resources. This research need further geoelectrical study with broad coverage area and geochemical analysis for detail karst characterizatio
Tipologi Sistem Akuifer Endapan Gunungapi
No full textAkuifer merupakan lapisan batuan bawah permukaan yang dapat menyimpan dan meloloskan air. Keberadaan air tanah di daerah endapan gunungapi umumnya pada batuan yang sangat berpori dan tidak kompak, berselang-seling dengan lapisan-lapisan aliran lava yang umumnya kedap air. Salah satu metoda yang digunakan dalam mengidentifikasi lapisan akuifer bawah permukaan adalah metoda geolistrik tahanan jenis. Metoda ini menggunakan prinsip aliran arus listrik yang mengalir di dalam tanah melalui batuan–batuan. Pada penyelidikan geolistrik tahanan jenis konfigurasi Wenner yang dilakukan di Desa Bissoloro, Kecamatan Bungaya, Kabupaten Gowa bertujuan untuk menentukan jenis lapisan, mengidentifikasi posisi sebaran akuifer dan menentukan jenis akuifer. Pada penelitian ini terdapat tiga lintasan pengukuran tahanan jenis mapping dengan panjang setiap lintasan 470 m, jumlah elektroda sebanyak 48 dan spasi tiap elektroda 10 m. Pada daerah penelitian terdapat dua jenis lapisan yaitu lapisan tufa (12.47 – 75 Ωm) diinterpretasikan sebagai lapisan akuifer dan lapisan breksi berselingan lava (76 – 2.203,19 Ωm). Posisi akuifer pada daerah penyelidikan tersebar di setiap lintasan. Jenis akuifer yang ada pada daerah tersebut yaitu akuifer bebas dan akuifer menggantung
Distribution Analysis of Sulphide Mineral (Pyrite) Using Induced Polarization Method in Libureng, Bone, South Sulawesi
No full textANALISIS PERCEPATAN TANAH MAKSIMUM, KECEPATAN TANAH MAKSIMUM DAN MMI DI WILAYAH SULAWESI UTARA
No full textPROCJENA PODLOŽNOSTI NA POJAVU LIKVEFAKCIJE POMOĆU HVSR I MASW METODE: STUDIJA SLUČAJA MAMUJU, ZAPADNI SULAWESI, INDONEZIJA
No full textThe 2021 Mamuju earthquake (Mw 6.2) highlighted the region's high vulnerability to liquefaction due to its proximity to active tectonic zones, as well as the presence of Holocene alluvial deposits, unconsolidated sedimentary formations, and water-saturated soils, all of which contribute to high susceptibility to seismic shaking. This research assesses the liquefaction potential of the Mamuju area using an integrated approach that combines the Horizontal-to-Vertical Spectral Ratio (HVSR) and Multichannel Analysis of Surface Waves (MASW) methods. This study investigates an inverse correlation between Vs30 and the seismic vulnerability index (Kg), where lower Vs30 values correspond to higher Kg values, indicating increased liquefaction susceptibility. The HVSR analysis shows that the dominant frequency (f₀) ranges from 0.4 to 11 Hz, while the amplification factor (A₀) varies between 1.1 and 11. The results indicate that coastal zones with thick alluvial deposits exhibit the lowest f₀ values ( 10, suggesting a higher likelihood of liquefaction. Conversely, areas underlain by the Mamuju Formation and Adang Volcanics, characterized by higher Vs30 (>175 m/s), f₀ (>10 Hz), and Kg (Potres koji je pogodio Mamuju 2021. godine (Mw 6,2) istaknuo je veliku ranjivost regije na likvefakciju zbog blizine aktivnih tektonskih zona, prisutnosti holocenskih aluvijalnih naslaga, nekonsolidiranih sedimentnih formacija i tla zasićenoga vodom, što sve pridonosi podložnosti zbog seizmičke aktivnosti. Ovo istraživanje procjenjuje podložnosti na likvefakciju područja Mamuju korištenjem integriranoga pristupa koji kombinira metodu omjera horizontalnoga i vertikalnoga spketra (HVSR) i metodu višekanalne analize površinskih valova (MASW). Ova studija istražuje inverznu korelaciju između Vs30 i indeksa seizmičke ranjivosti (Kg), gdje niže vrijednosti Vs30 odgovaraju višim vrijednostima Kg, što upućuje na povećanu podložnost na pojavu likvefakcije. HVSR analiza pokazala je kako se dominantna frekvencija (f₀) kreće od 0,4 do 11 Hz, dok faktor amplifikacije (A₀) varira između 1,1 i 11. Rezultati upućuju na to da obalna područja s debljim aluvijalnim naslagama pokazuju najniže vrijednosti f₀ ( 10, a što upućuje na veću vjerojatnost pojave likvefakcije. Nasuprot tome, područja ispod formacije Mamuju i vulkana Adang okarakterizirana su višim vrijednostima Vs30 (>175 m/s), f₀ (>10 Hz) i Kg
