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Subsurface Interpretation of the Panjang Fault Area, Lampung, Based on Geomagnetic Method Rasimeng, Syamsurijal; Fahruddin, Fahruddin; Valentin, Ferdio; Aurora, Theressia Githa; Nurlaili, Jesica
JURNAL GEOCELEBES Vol. 8 No. 1: April 2024
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v8i1.28303

Abstract

Research on the area along the Panjang Fault - Lampung, the area from the Teluk Betung to Tanjung Karang Barat area using the 19-T GSM PPM tool with base rover acquisition on 2 tracks 2 kilometers apart obtained 40 acquisition points with a spacing of 0.3 kilometers. This study aims to determine the type of lithology and subsurface rock structure by utilizing the susceptibility value of rocks from magnetic anomalies. In the process of processing magnetic anomaly data, upward continuation is carried out as high as 350 m which is intended to reduce the total anomaly with the upward anomaly results so that a residual anomaly is obtained. Next, make a 2D subsurface model on the incision A - B in the residual anomaly map. Based on the results of qualitative interpretation, the total magnetic anomaly of the research area illustrates positive to negative anomaly values with a tighter contour pattern that indicates the presence of a fault structure. While based on quantitative interpretation, the 2D modeling in incision A - B shows a susceptibility value of 0.100 cgs which can be identified as breccia tuff rock, a susceptibility value of 0.0391 cgs is thought to be rhyolitic tuff rock, pumice tuff rock, and sandstone tuff, and a susceptibility value of 0.150 cgs is a rock from the intrusion of Mount Betung in the form of andesite-basalt lava. In addition, rocks with a susceptibility value of 0.0024 cgs are metamorphic rocks. The correlation between 2D modeling and regional geology is seen in the research area, which is in the Tarahan Formation (Tpot), which is suspected to be a fault structure in the Bumi Waras area with a strike direction of NW - SE which is the course of geothermal manifestations or minerals.
Penguatan Mitigasi Dan Edukasi Tanggap Darurat Tsunami Di Desa Batu Balak, Lampung Selatan Rasimeng, Karyanto; Rasimeng, Syamsurijal; Maulida, Nanda Hanyfa; Mulyasari, Rahmi; Sinambela, Rudy Zefrianto
Nemui Nyimah Vol. 4 No. 1 (2024): Nemui Nyimah Vol.4 No.1 2024
Publisher : FT Universitas Lampung

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Abstract

The tsunami is a worrisome natural disaster typically in coastal areas, including Batu Balak Village in South Lampung. The Selat Sunda tsunami on December 22 2018 hit the Batu Balak Village residents and resulted in material and non-material losses. The unpreparedness of the residents who experienced this incident is a reminder of the urgency of the need to increase community preparedness in facing this threat. On this basis, service activities were carried out to strengthen mitigation and education on tsunami emergency response in Batu Balak Village, South Lampung. This service activity aims to strengthen the mitigation process and educate the community regarding the potential for a tsunami disaster in the Batu Balak area. Another purpose is to increase public knowledge of disaster management. The methods used in this service are needs analysis, solution design, program assistance, and implementation. Based on the problem analysis, we carried out a workshop event on tsunami disaster mitigation, how to increase the social economy by utilizing geotourism, and made a recommendation map for tsunami evacuation routes and zones. The workshop event was attended by several residents and community leaders. The results obtained from this activity are an increased understanding of the people who present regarding the tsunami disaster, what mitigation processes need to be implemented when a disaster occurs, and how to handle the loss after the disaster.
Feasibility and Safety Study of Grounding Design with Soil Resistivity Method in Penajam Area, East Kalimantan, Indonesia Emir Dzakwan Kamal Zein; Dani, Ilham; Rasimeng, Syamsurijal
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.2026.11.1.21332

Abstract

As the need for electrical energy for various sectors increases, especially in Penajam, East Kalimantan, which is currently under construction of the Indonesian Capital City (IKN), the existence of a power plant is very necessary. The construction and development of power plants require special studies to ensure feasibility and safety. Grounding is one of the important aspects in an electrical system to distribute unwanted current errors into the ground. Grounding design in an electrical system requires several important data such as soil resistivity values, the number of rods used, and the area of the installation. These data are used as input to calculate the actual design potential value with the permissible potential tolerance value starting from Ground Potential Rise (GPR), mesh, step, and touch potential. The grounding installation area plan is carried out in an area of    in the form of a square or rectangle with a sandy lithology with an average resistivity value of  and a clay area with an average value of   . Another plan is carried out using a grid design with  rods and without using rods. The rectangular sand area with a grid installation design using rods generally produces the smallest design potential value, namely a GPR value of , a mesh value of , and a step value of . The square clay area with a grid installation design without using rods generally produces the largest design potential value, namely a GPR value of , a mesh value of   , and a step value of . The main factor that most influences the determination of the grounding design potential value is the soil resistivity value and the lithology of the installation area as evidenced by the difference in the measured potential design value which is quite significant. However, the overall design plan in this study produces a safe and feasible conclusion as evidenced by all design value acquisitions being less than the tolerance limit set in the case of a human weight of  and  such as a step potential of  and a touch potential of .