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Sandri Erfani, S.Si, M.Eng.
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Geophysical Engineering Department Engineering Faculty Universitas Lampung, Prof. Dr. Sumantri Brojonegoro Street No 1, Rajabasa District, Bandar Lampung, Indonesia 35145
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JGE (Jurnal Geofisika Eksplorasi)
Published by Universitas Lampung
ISSN : 23561599     EISSN : 26856182     DOI : https://doi.org/10.23960/jge
Core Subject : Science,
Earth & Planetary Sciences
Jurnal Geofisika Eksplorasi adalah jurnal yang diterbitkan oleh Jurusan Teknik Geofisika Fakultas Teknik Universitas Lampung. Jurnal ini diperuntukkan sebagai sarana untuk publikasi hasil penelitian, artikel review dari peneliti-peneliti di bidang Geofisika secara luas mulai dari topik-topik teoritik dan fundamental sampai dengan topik-topik terapandi berbagai bidang. Jurnal ini terbit tiga kali dalam setahun (Maret, Juli dan November), Volume pertama terbit pada tahun 2013 dengan nama Jurnal Geofisika Eksplorasi (JGE).
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 8 Documents
 1 
Search results for , issue "Vol. 11 No. 1 (2025)" : 8 Documents clear
THE STRATIGRAPHY AND GEOLOGICAL STRUCTURE IN KOTAAGUNG TIMUR DISTRICT, TANGGAMUS, LAMPUNG Natalia, Happy Christin; Wiguna, Lanang Rangga Setia
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 1 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i1.477

Abstract

Kotaagung Timur region, Tanggamus Regency, Lampung, is the focus area of this research. In general, the area has a unique and complex geological setting such as the variety of volcanic rocks, granite, and the Sumatran Fault System that through this area. Geological research aims to obtain geology dynamics about stratigraphy and geology structure in the research area. Two analyses have been done to achieve these goals, i.e., field observation, petrography analysis, and structural geology analysis. The stratigraphy units of the study area are composed of volcanic rocks, plutonic rocks, and surface deposits and can be divided into eleven lithostratigraphic units. The stratigraphy of the research area can be grouped into 5 groups, i.e., the Mount Gisting volcanic group, the granitoid pluton group, the Cawang Haro Mountains volcanic group, the Mount Tanggamus volcanic group, and the alluvial deposit. Geological structures are well developed, and the research area is cut by ten faults, such as dextral strike-slip faults, sinistral strike-slip faults, and reverse faults. Based on these things, the geological history of the study area started in the Late Oligocene with three episodes of volcanism. The first episode was Mount Gisting’s volcanism during the Late Oligocene-Early Miocene, followed by the granitoid intrusion. The volcanic products of the Cawang Haro Mountains in the Middle Miocene mark the second episode. The last volcanic episode occurred in the Holocene, it came from Mount Tanggamus’s volcanism. The development of the structural geology happened before the previous volcanism episode.
ANALYSIS OF THE SUITABILITY OF PHYSICAL DEVELOPMENT OF THE CITY TOWARDS SPATIAL PLANNING IN PEKANBARU CITY Aini, Aisyah Nur; Ahyuni
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 1 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i1.482

Abstract

Pekanbaru City is one of the cities appointed as a National Strategic Area. Therefore, urbanization and changes in land use occur in Pekanbaru City. This study aims to decide on land-use changes, obtain information on the direction of physical development in Pekanbaru City, and decide the suitability between physical development and the Pekanbaru City spatial planning plan. The method used in this study is quantitative descriptive, digitizing on screen to make land use maps and overlaying in 2017 and 2023 to see changes in land use. The direction of physical development is obtained using a standard deviational ellipse. The suitability of land use with RTRW was obtained using the intersect overlay method.  The results of this study are 1) Changes in land use between 2017 and 2023 are dominated by settlements, industrial areas, and trade and services. For other land uses, there are also changes but not too significant. 2) The direction of physical development from the city center to the suburbs with a south and southwest direction. 3) The suitability between physical development and the Pekanbaru City Spatial Plan 2020 - 2040, as much as 33,6% is by the RTRW. Areas that are not following the RTRW are 63%. For areas that do not follow the RTRW, the figure is 3,4%. The conclusion of this study shows that most areas in Pekanbaru City have not been realized by the Pekanbaru City RTRW 2020-2040. With the increase in population, it is hoped that development will be achieved through the established development plan.
UTILIZATION OF MULTIBEAM ECHOSOUNDER DATA FOR BATHYMETRY MAPPING: EVALUATION WITH INTERNATIONAL STANDARD Nadzir, Zulfikar Adlan; Munthe, Manson Brian Utama
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 1 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i1.483

Abstract

Bathymetric mapping is crucial for understanding seabed conditions, especially in maritime countries like Indonesia. This study evaluates the quality of bathymetric data acquired using Multibeam Echosounder (MBES) in Jakarta waters. The acquired data was processed and analyzed based on the international standard IHO S-44. The results show that most acquired bathymetric data met the specified accuracy standard. However, some data did not meet the standard, especially in areas with varying depths. Bathymetric maps and seabed slope classification maps were successfully produced. The bathymetric map shows the complex morphology of the seabed, while the slope classification map indicates the dominance of flat areas. This research contributes significantly to efforts to improve the quality of bathymetric data in Indonesia.
STUDY OF ORE MINERALIZATION POTENTIAL IN METAMORPHIC ROCKS IN KAWATUNA AREA, PALU CITY, CENTRAL OF SULAWESI Asrafil, Asrafil; Mukaddas, Abdul; Puspita, Riska; Assidiqi, Muhammad; Rugayya, Sitti
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 1 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i1.484

Abstract

The Kawatuna area has a complex geological structure and lithological condition of metamorphic rock, which is estimated to be a weak zone for hydrothermal solutions to rise and then accumulate as mineralization of veins in the metamorphic rock. Based on this, it makes this area interesting to research. This research aims to identify metal ore minerals and the mineralization characteristics of ores in the research area. The method used is a geological survey of the surface and laboratory analysis through ore microscopic as well as mineral chemistry tests. Based on the results of the research study, it was found that in metamorphic rocks in the Kawatuna area, sulfide metal ore minerals were found including argentite (Ag2S), pyrite (FeS2), chalcopyrite (CuFeS2), sphalerite (ZnS), galena (PbS), and covelite minerals (CuS), Native elements ore minerals include gold (Au), silver (Ag), electrum (Au, Ag), and Oxide ore minerals in the form of hematite (Fe2O3). The mineralization formed is controlled by structures that produce fractures in the rock, which then produces mineralization as the veins of metamorphic rocks. The ore mineralization in the research area occurs through a hypogene process (the formation of a formation zone from primary ore minerals) and a supergene process stage (the formation of a formation or enrichment zone from secondary ore minerals).
ESTIMASI SUMBERDAYA BATUGAMPING DI PT. SEMEN BATURAJA TBK KABUPATEN OGAN KOMERING ULU PROVINSI SUMATERA SELATAN Azizah, Nurul; Ritonga, Magdalena Ritonga; Marlinda, Lenny
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 1 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i1.475

Abstract

Limestone is a rock that is generally whitish, fine-grained, composed of calcium carbonate, and formed below sea level. The Sumatra region, especially in the South Sumatra region, has potential mineral resources in the form of limestone located in the Ogan Komering Ulu district. The study area is included in the Baturaja Formation (Nmb) with the Baturaja limestone unit and the Gumai Formation (Nmg) with the Gumai limestone unit, which are stratigraphically deposited in harmony. The formation of origin in the study area is divided into 2, namely the form of structural origin consisting of structural valley landforms (S1), and the form of anthropogenic origin consisting of non-mine landforms (A1), mine slope landforms (A2) and sump landforms (A3). In the research area in the field observations, there is a geological structure in the form of a right horizontal fault. With field observations and the presence of limestone resources in the research area, mining can be carried out in the area. In limestone mining, estimation is needed to be able to calculate resources before the mining process takes place. In this study, the depth of the limestone layer is modelled with a block model with the aim of being able to see the distribution of layers to be estimated. The estimation of limestone resources uses the Inverse Distance Weighting (IDW) method by estimating the value of the area that does not have an inferred value.
PRELIMINARY ESTIMATION OF IGNEOUS ROCK RESERVE OF QUARRY MATERIALS USING GEOELECTRIC METHOD IN BIYUKU VILLAGE, BANGKO DISTRICT, JAMBI PROVINCE Dwiyantoro, Rizky Ramadhan; Hanatha, Fauzi Daffa; Anugrah, Febry
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 1 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i1.481

Abstract

The earth's subsurface can be composed of various rocks such as igneous rocks, sedimentary rocks, and metamorphic rocks. Determination of rock types below the surface is carried out using geophysical methods. This study aims to identify Rhyolite-Andesite Rock using the 2D geoelectric method of the Wenner-Schlumberger configuration used in determining the initial reserves of Rhyolite-Andesite mining materials by utilizing subsurface resistivity values ​​based on 2D and 3D resistivity cross-section analysis. The results of the petrological analysis showed that the rock was rhyolite  lava rock which was interpreted to come from the Rhyolite-Andesite Volcanic Formation of the Quaternary age. Interpretation of resistivity values ​​is divided into 2 groups, namely values ​​<350 Ωm interpreted as weathered igneous rocks due to structure and groundwater, then values> 350 Ωm interpreted as fresh igneous rocks of quarry mining materials (rhyolite). Initial reserve estimates based on 3D resistivity model blocks with a cutoff value of > 350 Ωm interpreted as rhyolite igneous rock have reserves volume  584,595.9461 m3.
Cover JGE JGE, Editor
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 1 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i1.496

Abstract

Cover JGE
Foreword March 2025 JGE, Editor
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 1 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i1.497

Abstract

Foreword March 2025

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