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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 216 Documents
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PENENTUAN FASIES, LINGKUNGAN PENGENDAPAN DAN IDENTIFIKASI SEBARAN BATUBARA DI FORMASI PALEMBANG, RIAU, SUMATRA Simatupang, Sandy Wesly; Widiatama, Angga Jati; Natalia, Happy Christin
JGE (Jurnal Geofisika Eksplorasi) Vol. 10 No. 3 (2024)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v10i3.432

Abstract

Cekungan Sumatra Tengah memiliki cadangan batubara melimpah yang dikelompokkan dalam Formasi Palembang. Formasi Palembang memiliki ekuivalensi dengan Formasi Muaraenim di Cekungan Sumatra Selatan. Penelitian pada Formasi Palembang masih relatif minim sehingga diperlukan pembahasa terkait fasies, asosiasi fasies, lingkungan pengendapan, dan juga geometri persebaran lapisan agar dapat digunakan sebagai rujukan kegiatan eksplorasi. Metode penelitian berupa analisis data petrofisika dan pemodelan bawah permukaan dari delapan data sumur pemboran. Dari interpretasi litologi yang dilakukan terdapat empat litologi dan tiga endapan pada daerah penelitian yang terdiri dari batubara, shaly coal, batupasir, batulempung, endapan konglomerat, endapan pasir, endapan lempung.  Litofasies pada daerah penelitian terdiri dari fasies endapan lempung, endapan pasir, endapan konglomerat, batulempung, batupasir, shaly coal, dan fasies batubara. Asosiasi fasies pada daerah penelitian terdiri dari channel, sandy bedform, overbank fines, dan swamps yang menginterpretasikan bahwa litologi yang ada pada daerah penelitian terendapkan pada daerah fluvial. Berdasarkan pemodelan bawah permukaan, litologi batubara pada daerah penelitian memiliki geometri melensa/membaji yang persebarannya dominan kearah timur. Batubara pada daerah penelitian diinterpretasikan terbentuk pada lingkungan pengendapan swamp.
ANALISIS HIPSOMETRI DI ZONA SESAR SEMANGKO, LAMPUNG BARAT Gultaf, Hikhmadhan
JGE (Jurnal Geofisika Eksplorasi) Vol. 10 No. 3 (2024)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v10i3.463

Abstract

Sesar Semangko merupakan salah satu segmen dari Sesar Sumatra yang terletak di Lampung Barat dengan panjang 65 km, membentang dari Teluk Semangko hingga Lembah Suoh. Sesar ini adalah sesar aktif, sebagaimana ditunjukkan oleh beberapa kejadian gempa dengan magnitudo Mw < 6,5. Selain kondisi litologi, keberadaan dan pergerakan Sesar Semangko memengaruhi kondisi geomorfologi di area penelitian. Seberapa tinggi tingkat keaktifan Zona Sesar Semangko mempengaruhi geomorfologi dapat diketahui melalui analisis morfometri. Penelitian ini bertujuan untuk memetakan tingkat aktivitas tektonik di Zona Sesar Semangko. Parameter geomorfometri yang digunakan adalah kurva hipsometrik (HC) dan integral hipsometrik (HI). Data yang digunakan dalam perhitungan HC dan HI adalah 266 SubDAS (Daerah Aliran Sungai) di Zona Sesar Semangko. Hasil penelitian menunjukkan bahwa rata-rata SubDAS berada pada tahap dewasa (mature stage) berdasarkan kurva hipsometrik. Sebanyak 196 SubDAS memiliki nilai HI antara 0,4 dan 0,5, yang menunjukkan aktivitas tektonik aktif, sedangkan 74 SubDAS memiliki nilai HI ≥ 0,5. Adapun nilai rata-rata HI adalah 0,5. Hal ini mengindikasikan aktivitas tektonik yang lebih aktif. Berdasarkan temuan ini, dapat disimpulkan bahwa Zona Sesar Semangko berada dalam kondisi tektonik aktif hingga lebih aktif, menunjukkan adanya potensi risiko tektonik yang signifikan di wilayah tersebut.
IDENTIFIKASI LAPISAN BAWAH PERMUKAAN TANAH PADA DAERAH LAND APPLICATION MENGGUNAKAN METODE GEOLISTRIK Rasyidin, Muhammad Amrul; Zulfian, Zulfian; Sutanto, Yuris
JGE (Jurnal Geofisika Eksplorasi) Vol. 10 No. 3 (2024)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v10i3.465

Abstract

Penelitian terkait identifikasi lapisan bawah permukaan pada land application di Desa Tapang Tingang telah dilakukan menggunakan metode geolistrik resistivitas jenis konfigurasi Wenner-Schlumberger. Land application menggunakan limbah cair kelapa sawit sebagai pupuk dan diaplikasikan pada tanah dengan media flatbed (parit). Pengambilan data dilakukan pada tiga lintasan dengan panjang setiap lintasan adalah 195 m. dan jarak antar elektroda yaitu 5 meter. Hasil pengolahan data menunjukan tiga buah lapisan penyusun yaitu lapisan pasir, lempung pasiran dan lapukan batuan granit. Nilai resistivitas bervariatif mulai dari nilai 3,15-1339 Ωm. Ketiga lapisan berada pada kedalaman 1,25-39,4 m pada ketiga lintasan. Pembangunan flatbed direkomendasikan di atas zona lapisan lempung pasiran dan lapukan batuan granit.
SPATIAL AND TEMPORAL B-VALUE ANALYSIS OF THE YOGYAKARTA REGION USING EARTHQUAKE DATA 1960 – 2024 R, Sari Rahayu; Madrinovella, Iktri
JGE (Jurnal Geofisika Eksplorasi) Vol. 10 No. 3 (2024)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v10i3.468

Abstract

Yogyakarta is one of the areas in Indonesia with a high risk of earthquakes due to its proximity to the subduction zone of the Indo-Australian Plate and Eurasian Plate and the presence of active fault activity, namely the Opak fault, which generates shallow earthquakes. A total of 13 destructive earthquakes were recorded in Yogyakarta and surrounding areas from 1840 to 2023, with the most destructive earthquake occurring in 2006 in Bantul. A total of 417 earthquakes were felt in the Yogyakarta area between May 2006 and March 2016. The high earthquake activity after the 26 May 2006 earthquake indicates a stress field on the active fault segment that has not been fully released.  This study aims to analyze the seismotectonic parameter b-value spatially and temporally to determine the accumulation of tectonic stress in Yogyakarta. The method used is a frequency-magnitude distribution with Gutenberg-Richter relation and Maximum Likelihood approach. Earthquake data were obtained from ISC and BMKG catalogs, with a total of 205 events. The results show that spatially, the b-value of the Yogyakarta region is generally low with a range of values of 0.35 - 0.75 using a grid of 1.5 x 1.5 km and a radius of 15 km with low values around the Opak fault and Ngalang Fault, meaning that the area still holds a high accumulation of stress energy and has the potential for large earthquakes to occur again in the future. Temporal analysis of the b-value shows a tendency for the b-value to decrease before a large earthquake and increase afterwards, reflecting the accumulation and release of stress in the rock.
Cover JGE JGE, Editor
JGE (Jurnal Geofisika Eksplorasi) Vol. 10 No. 3 (2024)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v10i3.473

Abstract

Cover JGE
Foreword November 2024 JGE, Editor
JGE (Jurnal Geofisika Eksplorasi) Vol. 10 No. 3 (2024)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v10i3.474

Abstract

Foreword November 2024
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).

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