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All Journal POSITRON Jurnal Neutrino : jurnal fisika dan aplikasinya JGE (Jurnal Geofisika Eksplorasi) Jurnal Geosaintek Jurnal Fisika FLUX Journal of Geoscience, Engineering, Environment, and Technology JTERA (Jurnal Teknologi Rekayasa) Spektra: Jurnal Fisika dan Aplikasinya Jurnal Geosains dan Teknologi Journal of Multidisciplinary Academic Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Indonesian Journal of Innovation and Applied Sciences (IJIAS) Jurnal Abdi Masyarakat Indonesia Journal of Innovation Research and Knowledge Jurnal Geosaintek Global Review of Tourism and Social Sciences
Antosia, Risky Martin
Department Of Geophysical Engineering, Sumatera Institute Of Technology, Jalan Terusan Ryacudu, Way Huwi, Jati Agung, Kabupaten Lampung Selatan, Lampung, Indonesia
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Journal : Journal of Geoscience, Engineering, Environment, and Technology

 1 
Basaltic Lava Characteristic in Goa Pandan Area, Sukadana, East Lampung: Inferences from Stratigraphy and Petrography Analysis Happy Christin Natalia Sirait; Bilal Al Farishi; Nono Agus Santoso; Andreas Maruli Pakpahan; Hissy Ijitiha Sari; Angga Jati Widiyatama; Risky Martin Antosia
Journal of Geoscience, Engineering, Environment, and Technology Vol. 8 No. 2 (2023): JGEET Vol 08 No 02 : June (2023)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2023.8.2.12118

Abstract

The presence of extensive basalt formations in East Lampung has its own attractions in the field of geology, particularly the presence of Goa Pandan as a lava cave and tourist attraction in East Lampung. The presence of basalt lava in the southern part of the South Sumatra Basin has drawn attention to the presence of this lava, but detailed research on the characteristics of the lava and its formation process is still very rare. This study aims to determine the eruption period of the basalt lava and magma evolution process based on the correlation between lava stratigraphy and petrography analysis. Field observations show a lava sequence that forms Goa Pandan. Each lava sequence is characterized by autobreccia and vesicular structures on the surface. In addition, the presence of columnar joints, sheeting joints, massive lava, and other additional structures indicate the characteristics of low-viscosity basalt lava. The presence of mineral structures and abundance under the microscope clearly shows the magma formation process when basalt lava flowed on the surface. Resorption-overgrowth of plagioclase and pyroxene minerals indicates an open system when basalt lava flowed on the surface. In addition, the presence of zoning and patching in plagioclase minerals indicates that magma variability is influenced by temperature. The documentation of this lava stratigraphy can serve as a basis for further understanding of magma characteristics and formation processes. There is still much geological work that can be done in the research area to get a detailed picture of the evolution process of magma and the presence of basalt lava in this area.
Analysis of Subsidence Hazards in Pandan Cave Area, Giri Mulyo Village, Marga Sekampung District, East Lampung using Analytical Hierarchy Process Bilal Al Farishi; Natalia, Happy Christin; Naufal, Rifqi Andi; Aganda, Riyanto Dedinta; Octafiani, Aulia; Hita Kirana; Depri; Pakpahan, Andreas Maruli; Sari, Hissy Ijitiha; Santoso, Nono Agus; Antosia, Risky Martin; Putri, Intan Andriani
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 2 (2024): JGEET Vol 09 No 02 : June (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.2.16848

Abstract

Pandan Cave is a basalt lava cave which is a unique geological tourism area located in Giri Mulyo Village, Marga Sekampung District, East Lampung Regency, Lampung Province. This cave was formed when the lava flow cooled at the top because it was in contact with the cold atmosphere, while at the bottom it was still flowing. This uniqueness caused Pandan Cave to become one of the tourist attractions that was once crowded with tourists. However, the condition of this cave is still very natural which can lead to the risk of geological disasters such as subsidence which can endanger tourists, so it is necessary to research to minimize the occurrence of geological disasters in the area. This research was conducted by observing aerial photographs, collecting data directly in the field, and then processing it with the Analytical Hierarchy Process (AHP). Parameters used in this AHP method include lithology, vegetation, weathering, rock mass class, and cave roof thickness. The existence of subsidence in the study area is influenced by weathering (34%), vegetation (31%), thickness of the cave roof layer (16%), lithology (10%), and rock mass class (9%). Based on the overlay results for each parameter that has been weighted, the Pandan Cave tourism area is divided into three subsidence hazard zone classifications, that is low hazard zone with value of 0.28-0.44, medium hazard zone with range of 0.44-0.60, and high hazard zone with range of 0.60-0.75. Through the Analytical Hierarchy Process (AHP) method and overlay of each parameter used, the distribution of subsidence hazard zones in the study area was obtained.  The low threat zone of 27.57 ha is about 57.07% of the total research area, the medium threat zone is 15.86 ha or about 32.83% of the total research area, and the high threat zone is 4.88 ha or about 10. 10% of the total research area.
Soft Layer Identification in Kedamaian District Using the HVSR-Derived Shear Wave Velocity Distribution Mulyana, Galang Dwi; Antosia, Risky Martin; Nathania, Edlyn Yoadan
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.1.25294

Abstract

The Kedamaian District in Bandar Lampung City is a densely populated urban area characterized by complex geological settings that are highly susceptible to seismic amplification and geotechnical hazards. Despite its vulnerability, high-resolution characterization of subsurface soft soil deposits in this specific district remains underexplored. The study aims to evaluate local site effects for designing seismic-resistant infrastructures and mitigating geotechnical hazards. This study attempts to locate and determine the characteristics of soft soil deposits in the Kedamaian District, Bandar Lampung City, by means of the HVSR method (Horizontal to Vertical Spectral Ratio) based on the shear wave velocity distribution result.  Microtremor measurements were taken from 37 points and processed to estimate the amplification factor ( ), dominant frequency of soil deposit ( ), and seismic vulnerability index ( ). HVSR inversion used the Particle Swarm Optimization (PSO) to propose average shear wave velocity down to 30 m depth ( ). Analysis indicated that the amplification values range from 2.31 to 9.11, with most values falling within a moderate level, indicating a moderate local site response. Dominant frequencies range from 0.63 to 18.76 Hz, and higher  values are characteristic of more compact and/or complex rock formations, whilst lower  values correspond to thicker sediments. Values of the seismic vulnerability index range from 0.48 to 119.24 s, with most sites showing a high seismic vulnerability related to the combined effect of high amplification and low dominant frequency. The distribution suggests that the study region consists predominantly of soft soils (type E) with  ranging from 80.9 to 132.6 m/s, interspersed with medium soils (type D) and less abundant hard rocks (type C). The results show that the Kedamaian is primarily covered with soft sediment formations, which have the potential to enhance strong ground motion during seismic events, as well as for a geotechnical investigation database and hazard assessment of earthquake activities and urban development within the region.
Co-Authors Aganda, Riyanto Dedinta Akbar, Hendra Hidayat Al Farishi, Bilal Anas Fauzi Masykuri Andreas Maruli Pakpahan Andri Yadi Paembonan Angga Jati Widiyatama Bilal Al Farishi Depri Dhiba, Farah Dimas Setiawan Dimas Setiawan Ekawati, Gestin Mey Erlangga, Mokhammad Puput Faranabila, Syifa Farduwin, Alhada Farishi, Bilal Al Habib Mustofa Hendriyastama, Kemas Daffa Hissy Ijitiha Sari Hita Kirana Intan Adiani Putri Irawati, Selvi Misna Irawati, Selvi Misnia Khoiriyyah, Alfi Muhammad Akhtar, Shan Muhammad Al Fiqri Idham Mulyana, Galang Dwi Natalia, Fransiska Natalia, Happy Christin Nathania, Edlyn Yoadan Naufal, Rifqi Andi Nugraha, Purwaditya Nur Hidayat Octafiani, Aulia Oryza Sativa, Amelia Pakpahan, Andreas Maruli Prasetyo, Nugroho Pratama, M Ilham Prima, Gilbert Purwaditya Nugraha Putra, Raga Mandala Putri, Intan Andriani Putri, Uci Amelia Putu Pradnya Andika Rahadian, Zatalini Syadni Rahmadani, Putri Amindar Ramdan, Muhammad Reza Rizki Rhahmi Adni Pesma Rizki Wulandari Rizki, Reza Ruchimat, Acep Ruhul Firdaus Santoso, Nono Agus Sari, Hissy Ijitiha Sigalingging, Asido Saputra Sihombing, Josua Nico Batistuta Sillak Hasiany Sipahutar, Andreas Syafitri, Meta Nisrina Syahputra, lan Darma Vigorous Raido Yudha Styawan