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Alluvial Soil Physical Properties in A Post-Earthquake Liquefaction Zone in Yogyakarta: Sifat Fisik Tanah Aluvial Pada Zona Likuifaksi Pasca Gempa Bumi Yogyakarta Karim, Rauf; Nurcholis, Muhammad
Jurnal Ilmu Tanah dan Air Vol 22 No 2 (2025): December 2025
Publisher : Universitas Pembangunan Nasional Veteran Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jta.v22i2.15591

Liquefaction is a secondary impact of earthquakes that can cause severe land degradation, including damage to agricultural areas. Bantul Regency experienced liquefaction during the 2006 earthquake, making it prone to further liquefaction, especially in the Jetis subdistrict. This study investigates the physical characteristics of soils prone to liquefaction and examines the correlation between the soil maturity index and liquefaction potential. Sampling points were determined using purposive sampling. The liquefaction potential index value was calculated using qualitative geological techniques at depths of 0–300 cm, yielding values of 28.40 and 18.01 for perennial tree and seasonal crop areas, respectively. Soil samples were collected, and laboratory analyses, including soil particle size, texture, organic matter, maximum moisture content, electrical conductivity (EC), permeability, redox potential (Eh), and plasticity index, were conducted. The results show key characteristics supporting liquefaction potential, including a dominant sand fraction (79.15%), maximum moisture content (88.94%), moderately fast permeability, high EC (0.416 mS/cm), and Eh values indicating aerobic tendency. All soil samples were categorized as physically immature based on the soil maturity index, reflecting weak interparticle bonding and high dispersion when saturated. Regression analysis between the soil maturity index and median grain size (D50) revealed insignificant correlations, with R = -0.56 (R2 = 0.3161) and 0.38 (R2 = 0.145) for perennial and seasonal crop areas, respectively. Visually, quadratic regression yielded R² values of 0.4109 and 0.4226, suggesting a potential nonlinear pattern. These findings indicate that soil maturity index influences liquefaction propensity. Further research is necessary to understand other controlling variables.

Alluvial Soil Physical Properties in A Post-Earthquake Liquefaction Zone in Yogyakarta: Sifat Fisik Tanah Aluvial Pada Zona Likuifaksi Pasca Gempa Bumi Yogyakarta Karim, Rauf; Nurcholis, Muhammad
Jurnal Ilmu Tanah dan Air Vol 22 No 2 (2025): December 2025
Publisher : Universitas Pembangunan Nasional Veteran Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jta.v22i2.15591

Liquefaction is a secondary impact of earthquakes that can cause severe land degradation, including damage to agricultural areas. Bantul Regency experienced liquefaction during the 2006 earthquake, making it prone to further liquefaction, especially in the Jetis subdistrict. This study investigates the physical characteristics of soils prone to liquefaction and examines the correlation between the soil maturity index and liquefaction potential. Sampling points were determined using purposive sampling. The liquefaction potential index value was calculated using qualitative geological techniques at depths of 0–300 cm, yielding values of 28.40 and 18.01 for perennial tree and seasonal crop areas, respectively. Soil samples were collected, and laboratory analyses, including soil particle size, texture, organic matter, maximum moisture content, electrical conductivity (EC), permeability, redox potential (Eh), and plasticity index, were conducted. The results show key characteristics supporting liquefaction potential, including a dominant sand fraction (79.15%), maximum moisture content (88.94%), moderately fast permeability, high EC (0.416 mS/cm), and Eh values indicating aerobic tendency. All soil samples were categorized as physically immature based on the soil maturity index, reflecting weak interparticle bonding and high dispersion when saturated. Regression analysis between the soil maturity index and median grain size (D50) revealed insignificant correlations, with R = -0.56 (R2 = 0.3161) and 0.38 (R2 = 0.145) for perennial and seasonal crop areas, respectively. Visually, quadratic regression yielded R² values of 0.4109 and 0.4226, suggesting a potential nonlinear pattern. These findings indicate that soil maturity index influences liquefaction propensity. Further research is necessary to understand other controlling variables.

Metaverse in Education: Exploring the Potential of Learning in Virtual Worlds Hartina, Sitti; Nurcholis, Muhammad; Dewi , A. Erni Ratna
Journal of Pedagogi Vol. 1 No. 6 (2024): Journal of Pedagogi - December
Publisher : PT. Anagata Sembagi Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62872/2z264r75

The digital age is bringing significant changes to education, with the metaverse as a technological innovation that offers great potential to revolutionize learning methods. Metaverse creates interactive learning experiences through 3D simulations and avatars, allowing students to learn in a virtual world that mimics real-world scenarios. This transformation changes the approach to learning to be more active, collaborative, and personalized, but also presents challenges, especially regarding accessibility and the digital divide. Students in rural areas often face constraints in accessing adequate devices and internet connections, while the cost of devices such as VR headsets remains high. In addition, issues of data security and privacy are important concerns, as students' personal data must be protected to strict standards. Metaverse also offers the opportunity to create an inclusive learning environment for people with disabilities, with features that can be customized to support their specific needs. However, maximizing the potential of the metaverse requires a paradigm shift in the curriculum, intensive training for teachers, and collaboration between the government, private sector and educational institutions. This research uses a descriptive qualitative approach to explore the potential and challenges of metaverse implementation in education, by collecting data through interviews, questionnaires and observations. The results show great benefits for learning, although access and data security challenges need to be addressed.

Caprock Integrity Assessment from Core-Based Formation Analysis and Laboratory Workflow: A Case Study of The Asri Basin Caprock Buntoro, Aris; Putra, Teddy Eka; Kristanto, Dedi; Swadesi, Boni; Amir, Zulhemi; Lukmana, Allen Haryanto; Wicaksono, Dimas Suryo; Nurcholis, Muhammad
Scientific Contributions Oil and Gas Vol 49 No 1 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i1.2021

Caprock integrity is a critical factor in ensuring the long-term safety of CO₂ geological storage, enhanced oil recovery (EOR), and wellbore stability. This study investigates the sealing performance of shale- and carbonate-rich caprock intervals from the Asri Basin, with specific focus on the Baturaja and Gita Formations. This study introduces a CT-guided integrated laboratory workflow for caprock integrity assessment, which simultaneously links petrophysical sealing capacity, mineralogical controls, and geomechanical strength within a unified experimental framework, a workflow rarely applied in Southeast Asian basins. Whole-core sections from Well ASR-1 were screened using computed tomography (CT) imaging to identify fractures and heterogeneity prior to plug extraction. Laboratory methods included porosity and permeability determination under variable confining stresses, mercury injection capillary pressure (MICP) analysis to evaluate sealing capacity, mineralogical characterization by X-ray diffraction (XRD), scanning electron microscopy (SEM–EDS), petrography, and mechanical testing (UCS, triaxial, and Brazilian tensile tests). The results demonstrate significant depth-dependent variability: The Baturaja Formation exhibited heterogeneous sealing capacity, with entry pressures ranging from 217 to 1,197 psi, while the Gita Formation consistently displayed strong sealing, with maximum Pc_entry of 2,844 psi and pore systems dominated by <0.1 µm throats. Mechanical tests confirmed adequate strength and the preservation of low permeability under confining stress, with clay content and carbonate cementation identified as primary controls on integrity. The integrated workflow enables a process-based interpretation of lithology-controlled sealing mechanisms, improving the robustness of site selection and risk assessment for CO₂ storage in the Asri Basin and similar carbonate and mudstone systems.

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