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All Journal IPTEK The Journal for Technology and Science Papanda Journal of Mathematics and Sciences Research Asskruie: Jurnal Pengabdian Kepada Masyarakat
Rahmatun Inayah
Universitas Mataram
Computer Science & IT Education Mathematics Social Sciences

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Identification of Soil Contamination using VLF-EM and Resistivity Methods: A Case Study Rahmatun Inayah; Bagus Jaya Santosa; Dwa Desa Warnana; Firman Syaifuddin; Juan Pandu Gya Nur Rochman; Wien Lestari; Amien Widodo
IPTEK The Journal for Technology and Science Vol 30, No 1 (2019)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (652.116 KB) | DOI: 10.12962/j20882033.v30i1.5004

Abstract

Hazardous waste is a waste with properties which can pollute and damage the environment, human health, and other living things. Lakardowo is a village that is suspected of being contamination by hazardous waste derived from industrial activities. Measurements with the VLF-EM and Resistivity method were used in this study. In addition, ground water level mapping and soil sampling in locations around the industry were conducted for the XRF test. Groundwater mapping results show that groundwater flow lead to the Northeast-South and Southwest of the industrial site. The soil samples that have been tested by XRF show the presence of heavy metals, wherein hazardous wastes generally contain various types of heavy metals that are conductive or have low resistivity values. Quantitative interpretation of VLF-EM data shows the presence of low resistivity anomalies at several measurement sites, which are suspected to have been contaminated with soil by waste. Resistivity data processing results, showing a low resistivity anomaly (≤ 3 Ω.m) located to the north (near an industrial site) and spreading towards the southwest along the measurement path. The result of a combination of quantitative interpretations of both methods, obtained, the direction of anomalous flow of hazardous waste moves southeastward and towards deeper soil coating following the direction of rock coating.
Strengthening Disaster Resilient Schools through Earthquake Mitigation Socialization at SMAN 1 Kuripan, Lombok Muhammad Jarul Rozki; Ahmad Rifaldi Arahman; Nela Ranita Amanda; Zyiadatun Adawiah; Ayu Mona Erisa Marpaung; Siti Azizah; Syamsuddin; Suhayat Minardi; Alfina Taurida Alaydrus; Rahmatun Inayah; Ika Umratul Asni Aminy; Adella Ulyandana Jayarti; Kormil Saputra
Asskruie: Jurnal Pengabdian Kepada Masyarakat Vol. 3 No. 1 (2025): November
Publisher : Saniya Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65190/asskruie.v3i1.445

Abstract

Indonesia is a country with high tectonic activity and frequently experiences earthquakes that can result in significant damage and casualties. One of the earthquake-prone areas is West Lombok Regency, West Nusa Tenggara. To increase disaster awareness and preparedness, an earthquake mitigation outreach program was conducted at SMA Negeri 1 Kuripan. This activity used a participatory–educational approach through interactive presentations, discussions, and the delivery of material using the educational song “Kalau Ada Gempa” from BMKG. The results of the activity show an improvement in students’ understanding and enthusiasm regarding mitigation measures and the importance of preparedness within the school environment. This program is expected to serve as an initial step toward developing a disaster-resilient school in West Lombok.
Inversion response of seismic refraction tomography in geometrically complex karst environments Rahmatun Inayah; Syamsuddin Syamsuddin; Suhayat Minardi; Adella Ulyandana Jayatri; Ika Umratul Asni Aminy; Nazla Izyatin; Karmila Cahya Putri
Papanda Journal of Mathematics and Science Research Vol. 5 No. 1 (2026): Volume 5 Nomor 1 Maret 2026
Publisher : Papanda Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56916/pjmsr.v5i1.3560

Abstract

Geotechnical construction failures and sinkhole risks in critical infrastructure areas are often exacerbated by the unpredictable nature of karst subsurface structures. The identification of subsurface cavities in limestone poses significant challenges due to material heterogeneity and the complexity of wave propagation. This study aims to evaluate the response of seismic tomography inversion models to real-world conditions, particularly in detecting the influence of cavities and secondary structures on P-wave velocity ( ) characteristics. Data acquisition was conducted in the Kalipalung Formation using five seismic refraction lines with a constant inversion scheme of 20 iterations. The results demonstrate that model accuracy is highly sensitive to surface geometry, where the Root Relative Mean Square Error (RRMSE) increased drastically from 7.97% on flat topography to 39.79% on steep slopes due to wavefield scattering phenomena. Physically, the inversion model successfully identified lithological zoning with a  range of 300–3900 m/s. However, the presence of secondary structures, such as massive stalactites and calcite recrystallization, causes cavity anomalies (300–600 m/s) to appear fragmented (spotty) and discontinuous. This phenomenon confirms the presence of volume averaging and blind zone effects that mask the acoustic impedance contrast between air and the host rock. Thus, while seismic tomography is effective in mapping subsurface material heterogeneity, the internal complexity of karst systems and extreme topography remain the primary limiting factors in fully delineating cavity geometry. This evaluation highlights the necessity of topographic static corrections and high-density sensor arrays to reduce interpretation uncertainty in extreme karst zones
Co-Authors Adella Ulyandana Jayarti Adella Ulyandana Jayatri Ahmad Rifaldi Arahman Alfina Taurida Alaydrus Amien Widodo Ayu Mona Erisa Marpaung Dwa Desa Warnana Ika Umratul Asni Aminy Irwan Setyowidodo, Bagus Jaya Santosa Juan Pandu Gya Nur Rochman Karmila Cahya Putri Kormil Saputra Muhammad Jarul Rozki Nazla Izyatin Nela Ranita Amanda Siti Azizah Suhayat Minardi Syaifuddin, Firman Syamsuddin Syamsuddin Zyiadatun Adawiah