http://journal.unhas.ac.id/index.php/geocelebes/issue/feedJURNAL GEOCELEBES2023-05-02T00:00:00+00:00Muh. Altin Massinaigeocelebes@sci.unhas.ac.idOpen Journal Systems<p>Jurnal Geocelebes is a peer-reviewed and scientific journal published which is intended as a means of scientific publication in the field of geophysics ranging from theoretical topics to the topic topics of geophysical applications in various fields. The published papers are original research results, reviews of recent advances from a particular topic, geophysical application case studies or reviews of geophysical-related software.</p> <p>Jurnal Geocelebes is published twice a year in April and October by the Department of Geophysics, Hasanuddin University, Indonesia.</p> <p>Authors are invited to submit manuscripts that fall within the scope of the Jurnal Geocelebes. Please read the information on the <a href="https://journal.unhas.ac.id/index.php/geocelebes/focusandscope" target="_blank" rel="noopener">Focus and Scope</a>. The articles published in Jurnal Geocelebes are going through a double-blind peer-review process. Hence, the decision on whether the scientific article is accepted or not, will be the Editorial Board’s right based on the peer reviewer's recommendation.</p> <p>Please read and understand the author's guidelines for the preparation manuscript. The author who submits a manuscript to the editors should comply with the author's guidelines and <a href="https://docs.google.com/document/d/1SJXd8YkFRdkA8Okx9f-BB_zm8M4rxrik/edit?usp=share_link&ouid=105472877138572928349&rtpof=true&sd=true" target="_blank" rel="noopener">template</a>. If the submitted manuscript does not comply with the guidelines or using a different format, it will be rejected by the editorial team before being reviewed. The editorial team will only accept a manuscript that meets the specified formatting requirements.</p>http://journal.unhas.ac.id/index.php/geocelebes/article/view/23710Determination of Seawater Intrusion Zones Using the Resistivity Method in Kelurahan Soreang, Maros District, South Sulawesi Province2022-11-18T06:22:45+00:00Syamsuddin Syamsuddinsyamsuddin@fmipa.unhas.ac.idMuhammad Fajarmuhammad.fajar@email.comAndry Harmaji Wirawanandry.harmaji.wirawan@email.comNurul Salsabilanurul.salsabila@email.comRezky Rezkyrezky@email.comMuhammad Fawzy Ismullah Massinaifawzy@sci.unhas.ac.idSelfiana Selfianaselfiana@email.comBambang Harimeibambang_harimei2004@yahoo.com<p>The seawater intrusion into the groundwater layer is one of the factors that can disrupt groundwater quality in Soreang Village, Maros Regency. This is a serious problem for the community in the area, so it is necessary to identify the seawater intrusion zone. Previous study using the resistivity method is in regional scale. In this study, two intersecting lines with a length of 470 meters each were acquired using the Wenner-Schlumberger array with a spacing of 10 meters to get local scale. Based on the resistivity value of the study area, there are three layers interpreted as a layer of fill (1 - 1000 Ωm), alluvium layer (1 - 6 Ωm) and limestone layer (≥ 7 Ωm). The seawater intrusion zone in the study area is in the alluvium layer with varying depths up to 40 meters subsurface. The results of this study can be a reference for the community or government in the search for fresh water.</p>2023-11-02T00:00:00+00:00Copyright (c) 2023 JURNAL GEOCELEBEShttp://journal.unhas.ac.id/index.php/geocelebes/article/view/22348Analysis of Seismotectonic Parameters and Earthquake Return Periods in The Nias Area (1980-2021)2022-09-06T23:04:08+00:00Riski Efrina Siregarriski.efrina@uinsu.ac.idLailatul Husna Lubislailatulhusnalubis@uinsu.ac.idRatni SiraitSirait.ratni@gmail.comNovita Sarinovitasari@bmkg.go.id<p>The Nias Islands region is an area prone to earthquakes with a very high level of earthquake activity. One reason is the source of the subduction zone which is in the northwest of the Nias Islands. The aim of this work is to determine the b-value, seismic index, and earthquake return period using probabilistic techniques. For the years 1980 to 2021, the Meteorology, Climatology and Geophysics Agency (BMKG) published data with a magnitude of 3-6.7 and a depth (H) of 10-300 Km. The research results obtained by calculating the highest b-value is 0.791 in South Nias district and the highest a-value is in the South Nias district of 3.97. Calculation of the highest seismicity index with a magnitude of 6.7 in South Nias district with a-value of 7.223191 with an earthquake return period of 14 years.</p>2023-11-02T00:00:00+00:00Copyright (c) 2023 JURNAL GEOCELEBEShttp://journal.unhas.ac.id/index.php/geocelebes/article/view/23759Identification of Mount Sirung Geothermal Potential based on Land Surface Temperature and 3D Gravity Model2022-12-24T12:04:24+00:00Ayu Alvita Primastikaayu.alvitaa@gmail.comDhika Faiz Fadriandhikafaiz@gmail.comFardhan Rafshan Zanifardhan.rafshanzani44@gmail.comNanda Ridki Permananandaridki836@gmail.com<p class="AbstractNormalText">According to the Ministry of Energy and Mineral Resources 2021 data, first ranks in the list of 10 provinces with the lowest electrification ratio in Indonesia. One of the geothermal prospect areas in East Nusa Tenggara is Mount Sirung. This research was conducted in August 2022 which aims to identify geothermal systems. Gravity data was obtained from the GGMPlus 2013 with a total of 3819 data. Land Surface Temperature (LST) is used as supporting data with a surface temperature approximately 26.1 – 29.5°C because there are manifestations of hot springs at Mount Sirung. Based on the derivative analysis, there are four trajectories in the northwest-southeast direction with reverse faults and normal faults as the geothermal control system of Mount Sirung. The results of 3D gravitational inversion modeling are estimated that there is clay interspersed with breccia with a density of 2.34 – 2.39 g/cm<sup>3</sup> as clay cap at 0 – 600 m, and lava interspersed with sandy tuff as a reservoir with a density of 1.98 – 2.03 g/cm<sup>3</sup> at 700 – 1400 m. Based on these results and discussions, Mount Sirung is proven to have geothermal potential which can be utilized as a source of electrification in East Nusa Tenggara.</p>2023-11-02T00:00:00+00:00Copyright (c) 2023 JURNAL GEOCELEBEShttp://journal.unhas.ac.id/index.php/geocelebes/article/view/25476Assessment of Landslide Susceptibility Microzonation using Microtremor Measurements Along Mountain Road in North Bengkulu–Lebong, Bengkulu Province2023-02-24T18:47:44+00:00Ulfa Nuramadaniulfadhaniab1919@gmail.comHalauddin Halauddinhalaukualasatu@gmail.comSuhendra Suhendrasuhendra@unib.ac.idDarmawan Ikhlas Fadliikhlasfadli@gmail.comArdika Pratama Panjaitanartpanjaitan@gmail.comJesika Erni Elfrita Sinagajesikasinagaernie@gmail.com<p>Based on the geological condition, the research location on the North Bengkulu - Lebong crossing is on the Sumatra fault zone that extends from south to north, which causes this area to have a morphological shape and topography of hills and hills extreme slopes. This research results in landslide-prone micro zonation based on GSS and PGA values obtained from Horizontal-to-Vertical Spectral Ratio (HVSR) method measurements. The research was conducted by measuring 25 research sites. The results of Peak Ground Acceleration (PGA) values processing at the research site, between 0.14 gal - 0.53 gal. Locations with the potential for landslides, shown in blue (0.14-0.29 gal), are located in several spots of the research site. The distribution of Ground Shear Strain (GSS) at the study site is evenly distributed at a value of 10-4, which indicates that the study site is prone to cracking and ground movement. In the distribution of GSS values, it is suspected that the location in the dark red color (10-3) has the highest potential to experience repeated landslides. Based on the results of the calculation of PGA and GSS values on the North Bengkulu - Lebong crossing, the points of landslide-prone locations can be known so that disaster mitigation can be carried out at these locations to reduce the risk that will occur.</p>2023-11-02T00:00:00+00:00Copyright (c) 2023 JURNAL GEOCELEBEShttp://journal.unhas.ac.id/index.php/geocelebes/article/view/25371Middle Eocene Nannofossil Assemblages Responding to Depositional Dynamics of the Elat Formation, Maluku2023-02-27T08:42:19+00:00Ratih C. F. Ratumananratihcfr@gmail.comVijaya Isnaniawardhanivijaya.isnania@unpad.ac.icBudi Muljanabudi.muljana@unpad.ac.id<p>The Kei Besar Island is mainly composed of the Elat Formation carbonate rocks. This research was conducted to determine the nannofossils assemblages in the Elat Formation to interpret the depositional dynamics during its formation. Lithological observations and sampling for nannofossil analysis were carried out on three measured stratigraphic sections: Section 1 - Hollat, Section 2 - Ngurdu, and Section 3 - Mata Hollat. A total of 47 species assigned to 25 genera of nannofossils were identified in 45 selected samples. The succession of the Elat Formation in the study area formed at NP16 to N17 or Middle Eocene. Stratigraphic reconstruction supported by biostratigraphy analysis shows that Section 3 at the lower (NP16 to NP 17), Section 2 in the middle part (NP 17), and Section 1 at the upper (NP 17). R-mode cluster analysis of nannofossils defined four species clusters (assemblies A, B, C and D) that tend to occur together. Q-mode cluster analysis defined five depth-distribution clusters (1, 2, 3, 4, and 5), each deposited under similar conditions. Based on large foraminifera, the succession was formed in fore reef setting in neritic bathymetric zone. Coarsening and thickening upward supported by the nannofossil assemblages indicate depositional dynamics which tend to be shallower. Reworked fossils, commonly found at the lower of the Elat Formation, show the mechanism of turbid currents in early deposition.</p>2023-11-02T00:00:00+00:00Copyright (c) 2023 JURNAL GEOCELEBEShttp://journal.unhas.ac.id/index.php/geocelebes/article/view/20603Analysis of Unconventional Oil and Gas Reservoirs using Well Logging, Geochemical and Seismic Data2022-09-17T21:46:22+00:00Rahmat Catur Wiboworahmat.caturwibowo@eng.unila.ac.idAryka Claudia Eka Putriaryka@gmail.comOrdas Dewantoordasdewanto@gmail.com<p>Since conventional oil and gas is under a depletion phase, unconventional oil, and gas have become prime candidates for current and future oil and gas production. Based on this, investment and research have increased significantly related to unconventional oil and gas exploitation, especially in the North East Java Basin, one of the sedimentary basins producing oil and gas. The research was conducted in the form of well-logging, geochemical, and seismic data analysis to determine the quality and quantity of oil and gas reservoirs. The thickness and TOC value of the reservoir were determined using well-logging data using the Passey method, resulting in a thickness ranging from 900-954 ft and an average TOC value of 3.87 Wt% in the Kujung III Formation. Based on geochemical data analysis, the reservoir has type II kerogen with an immature-early mature maturity level (Ro and Tmax). Meanwhile, based on seismic data, the reservoir thickens to the northwest, ranging from 500-600 m. Unconventional oil and gas reservoirs in the research area have the potential to be developed because they meet several criteria, such as being rich in organic material and thick, even though the maturity level is still in the immature phase. It is estimated that deeper areas will produce different levels of maturity as pressure and temperature increase.</p>2023-11-02T00:00:00+00:00Copyright (c) 2023 JURNAL GEOCELEBEShttp://journal.unhas.ac.id/index.php/geocelebes/article/view/22588Advanced Processing of 2D Marine Reflection Seismic Data Using the Common Reflection Surface (CRS) Stack Method with K-L Filter Application2023-04-30T06:52:29+00:00Emir Dzakwan Kamal Zeinemirdzakwan63@gmail.comSyamsurijal Rasimengsyamsurijal.rasimeng@eng.unila.ac.idEgie Wijaksonoegie.wijaksono@email.com<p>Data processing using the seismic reflection method is an important stage in the exploration of natural resources and minerals. This research was conducted to determine the effective and efficient stacking and filtering methods in reconstructing the subsurface geological structure of the earth from the results of data processing using ProMAX software. The data processing method used is the conventional stack and the Common Reflection Surface (CRS) stack. Aperture values of 0 ms – 50 m and 3000 ms – 150 m in the CRS stack process produce the most optimum seismic sections. Both methods produce a different quality of seismic cross-section display. The 2D cross-section model from the conventional stack method looks noisier than the results from the CRS stack method. In addition, the reflector pattern on the cross-section of the results of the CRS stack method is clearer and visible with a relatively large amplitude compared to the results of the conventional stack method. To maximize the quality of data display, data enhancement is applied, which is the K-L filter. The eigenimages value of 0.10% on the K-L filter with a horizontal window width of 120 is used to reduce random noise. Thus, an increase in the S/N ratio will be obtained in the seismic data so that the 2D cross-sectional model of the seismic reflection method can approach the original conditions of the subsurface geological structure.</p>2023-11-02T00:00:00+00:00Copyright (c) 2023 JURNAL GEOCELEBEShttp://journal.unhas.ac.id/index.php/geocelebes/article/view/22223Relocation of the Hypocenter of an Earthquake with the Double Difference Method in the Regional Study Area of Yogyakarta2022-09-05T05:42:08+00:00Fani Rohmiasihfani.rohmiasih@email.comAndi Andiandi@uin-suka.ac.idNugroho Budi Wibowonugrohobudiwibowo@gmail.com<p>The relocation of the earthquake hypocentre is necessary in order to determine the position of the earthquake centre with higher accuracy. An accurate hypocentre position is important for earthquake-prone areas mapping, seismicity analysis, and fault zone identification. The double difference algorithm technique using the hypoDD program can be used for hypocentre relocation. This article reports the earthquake relocation of 23 earthquakes in the Yogyakarta region recorded at four observation stations. The result shows that the hypocentre shift spreads randomly with a shift distance of less than 20 km, with the most shifting direction of the epicentre to the northeast. The Earthquake’s hypocentre after relocation in the land area is estimated to be triggered by a fault under the Gamping Wungkal Formation, while the earthquake around Mount Merapi is estimated to be triggered by volcanic activity. The Relocation result in the sea area show that the hypocentre leads to the subduction line.</p>2023-10-10T00:00:00+00:00Copyright (c) 2023 JURNAL GEOCELEBEShttp://journal.unhas.ac.id/index.php/geocelebes/article/view/25258Potential of Limestone as a Groundwater Reservoir based on Porosity Analysis in the Tintingon Area, Banggai District2023-03-01T07:12:56+00:00Nurhikmah Supardinurhikmah.supardi90@gmail.comSyarifullah Bundangsyarifullah@unkhair.ac.idMeltini Pakidingmeltini.pakiding@email.com<p>The research area is in Tintingon Village, Banggai Regency, Central Sulawesi Province. This study aims to determine the quality of limestone as a groundwater reservoir based on porosity analysis. This study begins with sampling limestone at seven stations, then selecting fresh samples for laboratory analysis. Laboratory analysis consists of two, namely petrographic analysis and porosity analysis. The petrographic analysis aims to determine the microscopic naming of limestone and the type of pores in the rock. Porosity analysis aims to test the ability of limestone to accommodate fluids as a groundwater reservoir. Based on the petrographic analysis, it is known that the microscopic naming of limestone in the study area is wackestone and packstone. The types of limestone porosity are vug, intercrystal, channel and interparticle. Analysis of limestone porosity in the study area is known to be 15.24% - 29.95%. The porosity value is categorized as good to excellent so the research area is very good as a groundwater reservoir rock.</p>2023-10-11T00:00:00+00:00Copyright (c) 2023 JURNAL GEOCELEBEShttp://journal.unhas.ac.id/index.php/geocelebes/article/view/23930Presentation of Green Open Space of Makassar City inN WebGIS2023-01-02T04:22:53+00:00Samsu Arifsamsu_arif@unhas.ac.idAswar Syafnuraswar.syafnur@unhas.ac.idA. Muh. Imran Ismaila.muh.imran.ismail@email.comAza Azzahraaza.azzahra@email.comWikal Wikalwikal@email.com<p>Green open space has three basic functions, among others, to function socially, namely as a facility for the public with the functions of recreation, education and sports, as well as establishing communication between city residents; to function physically, namely as the lungs of the city, protecting the water system, soundproofing, fulfilling visual needs, restraining the development of built-up land/as a buffer, and protecting city residents from air pollution; and functions as an aesthetic that is a binder between building elements in the city, a giver of characteristics in shaping the face of the city, and an element in the arrangement of urban architecture. Law No. 26 of 2007 concerning Spatial Planning, it is explained that the spatial planning of the city area must include a plan for the provision and utilization of green open space which covers at least 30% of the city area consisting of 20% public green open space and 10% consisting of private green open space. . But in reality, there are still many big cities that are not difficult to achieve the provisions of the law. This research will identify green open space in Makassar City by utilizing satellite image data and then presenting the green open space in the form of spatial information into a Web GIS so that it can be easily accessed openly. Based on the results of the analysis, the percentage of open green space in Makassar reached 9.08%, consisting of private green open space of 4.07% and public green open space of 5.01%.</p>2023-10-31T00:00:00+00:00Copyright (c) 2023 JURNAL GEOCELEBES