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All Journal Jurnal Fisika FLUX Engineering, Mathematics and Computer Science Journal (EMACS) Lowland Technology International Journal of the Civil Engineering Forum
Lindung Zalbuin Mase
University of Bengkulu
Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics Transportation

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A comparative study of geophysical measurements to characterise the local site condition of Bengkulu City, Indonesia Lindung Zalbuin Mase; Samsul Bahri; Aliawan Saputra
Lowland Technology International Vol 22 No 3 (2020): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i2, Septemb.630

Abstract

Bengkulu City is one of the vulnerable areas to undergo earthquakes in Indonesia. Two major earthquakes happened in 2000 and 2007 had appeared the issue that the site condition played the important role in determining the seismic effect in Bengkulu City. However, the detail understanding of local site condition including the parameter to measure it, is still not fully achieved. This paper presents a comparative study of geophysical measurement to characterise local site condition in Bengkulu City. The geophysical surveys using Multichannel Analysis of Surface Wave (MASW) and Ambient Noise of Microtremor methods are performed to several sites in Bengkulu City. Furthermore, the inversion analysis to generate shear wave velocity (Vs) is performed. The comparisons to site class and time-averaged shear wave velocity for first 30 m depth (Vs30) are also compared. The results show that MASW results tend to be more conservative than Microtremor results. However, both measurements show the similar tendency for site class condition. This study also proposed the empirical models in estimating Vs30 and seismic vulnerability (Kg) indices for Bengkulu City. Those models are reliable in engineering practice application in Bengkulu City.
Implementation of Agent Based Modelling to Observe the Evacuating Behavior at Faculty of Engineering Building, University of Bengkulu, Indonesia Hardiansyah; Wida Fitrianip; Annisa Fitria Edriani; Robi Hardiansyah; Rizka Lestyanti; Lindung Zalbuin Mase
Journal of the Civil Engineering Forum Vol. 8 No. 2 (May 2022)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6134.376 KB) | DOI: 10.22146/jcef.3589

Abstract

Evacuation is an important issue during the occurrence of an earthquake, due to the influence of people’s responsive behaviours to the disaster. This indicates the occurrence of overcrowded conditions, which causes the conflict of people’s movement. It is also one of the main reasons the process of evacuation is difficult, leading to the necessity to specifically model the movement within each building. Therefore, this study aims to analyze the earthquake evacuation modelling in Faculty of Engineering building, University of Bengkulu, Indonesia. This used a multi-agent programmable modelling environment known as NetLogo, which adopted an ABM model that is often utilized to observe elemental movement response. The agents occupying the building also moved to the stairs and evacuation doors, for exit towards the assembly point, which was located in front and behind Faculty of Engineering. The agent-based modelling is then conducted by inputting the layout of the building and the number of occupants in each room. Furthermore, the simulations were performed by considering various agents’ capacity in the building, during the evacuation. The results showed the time taken for the agents to exit the building during the disaster. This confirmed that the required exit time generally decreased with the increasing population percentage in the building. During this process, the conflict point also occurred around the corridor of Floors 1 and 2 (T1, T2 and T3), as well as the exits of the building (P1, P2, P3, and P4). This was due to the occurrence of a high density when agents carry out evacuation movements. Based on these results, the placement of signs was recommended, as guidelines during the evacuation process.
Probabilistic Liquefaction Potential Mapping in South Lebong Based on PSHA-Derived PGA Diefi Deayuzeta; Lindung Zalbuin Mase; Fepy Supriani; Tri Bintang Pratitis; Rena Misliniyati; Khairul Amri
Engineering, MAthematics and Computer Science Journal (EMACS) Vol. 8 No. 1 (2026): EMACS
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/emacsjournal.v8i1.15761

Abstract

This study evaluates liquefaction potential in South Lebong Subdistrict, Lebong Regency, Bengkulu Province, which is located in an active tectonic region influenced by the Sumatra Fault system and dominated by alluvial deposits. A probabilistic approach using the Probabilistic Seismic Hazard Analysis method to determine Peak Ground Acceleration (PGA) values for 10% and 2% probabilities of exceedance in 50 years, representing moderate to extreme earthquake conditions. South Lebong District is dominated by PGA values greater than 0.8g, particularly under the 2% probability scenario, indicating relatively high seismic hazard in the study area. Under the 10% probability scenario, several locations still show PGA values ranging from 0.4g to 0.8 g. The obtained PGA values were subsequently used to evaluate liquefaction potential through calculations of the Cyclic Stress Ratio (CSR), Cyclic Resistance Ratio (CRR), and Factor of Safety (FS). Additionally, susceptibility was assessed using the Liquefaction Potential Index (LPI) method. The results indicate that higher PGA values under the 2% probability scenario increase seismic loading intensity and liquefaction susceptibility within the study area. Based on the LPI classification, liquefaction potential under the 10% probability scenario is generally categorized as low to moderate, whereas under the 2% probability scenario, several locations shift into the moderate to severe liquefaction category. These findings indicate that liquefaction susceptibility in the South Lebong District is strongly influenced by the interaction between earthquake loading intensity and local geotechnical conditions. Therefore, the results of this study can support earthquake hazard mitigation planning and the development of safer areas that are less vulnerable to liquefaction hazards.
Assessment of Soil Resistance Based on Variations in Shear Wave Velocity (Vs) in the Muara Bangkahulu Area, Bengkulu City Roky Suprandani; Lindung Zalbuin Mase; Fepy Supriani; Rena Misliniyati; Khairul Amri
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 23, No 1 (2026): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v23i1.22575

Abstract

Kawasan Muara Bangkahulu merupakan kawasan yang rentan terhadap aktivitas seismik karena terletak di zona subduksi serta keberadaan patahan aktif Sumatera dan Mentawai. Penelitian ini bertujuan untuk menyajikan peta mikrozonasi berdasarkan variasi kecepatan gelombang geser (VS) pada kedalaman 10 hingga 50 m (VS10 s.d. VS50). Data yang digunakan adalah kecepatan gelombang geser (VS) hasil survei mikrotremor. Enam titik representatif dipilih berdasarkan persebaran permukiman dan fasilitas publik. Pengolahan data VS dilakukan untuk mendapatkan nilai VS10, VS20, VS30, VS40, VS50 kelas situs, dan nilai Ground Ampification factor (GAF). Hasil penelitian menunjukkan bahwa sebagian besar titik penelitian tergolong kelas situs C (tanah keras, batuan lunak) dan D (tanah sedang) dengan rentang VS10, VS20, VS30, VS40, VS50   berkisar antara 290,3 - 534,7 m/s. Kawasan Muara Bangkahulu didominasi oleh nilai GAF sedang hingga tinggi berkisar antara 0,8 s.d. 2,0. Penelitian ini diharapkan dapat menjadi acuan dalam memahami karakteristik tanah yang dinamis sebagai informasi penting untuk perencanaan tata ruang dan mitigasi risiko gempa bumi di kawasan Muara Bangkahulu.
Co-Authors Aliawan Saputra Annisa Fitria Edriani Diefi Deayuzeta Fepy Supriani Hardiansyah Khairul Amri Rena Misliniyati Rizka Lestyanti Robi Hardiansyah Roky Suprandani Samsul Bahri Tri Bintang Pratitis Wida Fitrianip