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p-Index From 2020 - 2025
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All Journal Journal of Earth and Marine Technology (JEMT)
Ching, Kuo-En
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Physics Transportation

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Present-day Crustal Deformation in West Sumatra After Series of Sumatran Great Earthquake from 2004-2010 Alif, Satrio Muhammad; Ching, Kuo-En; Siagian, Jenny Melynda; Anggara, Ongky
Journal of Earth and Marine Technology (JEMT) Vol 3, No 2 (2023)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2023.v3i2.3733

Abstract

Present-day crustal deformation was an attempt to estimate earthquake potential, yet the presence of postseismic deformation should be carefully identified. Studying crustal deformation in West Sumatra has been important for this purpose since the series of Sumatran Great Earthquake from 2004-2010. This study utilized present-day GNSS data (2017-2021) and pre-2004 GNSS velocities to understand the present-day crustal deformation. Bernese 5.2 was used to process the GNSS data and linear regression was used to calculate present-day velocities. These velocities were transformed into an ITRF2000-based Sundaland plate reference frame and then the velocities were compared to pre-2004 velocities in the same reference frame. The present-day velocities were ranging from 28.4 mm/yr to 58.3 mm/yr in ITRF2014 and from 8.8 to 44.8 mm/yr in the Sundaland plate reference frame. This suggests West Sumatra was located on the Sumatra block of the Sundaland plate. The low velocity difference ( 11.7 mm/yr) with the random vector direction between present-day velocities and pre-2004 velocities shows that there is no postseismic deformation affecting West Sumatra. This proposes the utilization of present-day velocities for earthquake potential estimation in West Sumatra.
Impact of Land Subsidence-Induced Three-Dimensional Surface Deformation on Infrastructure in the Semarang-Demak Alluvial Plain, Indonesia Azeriansyah, Reyhan; Ching, Kuo-En; Darmo Yuwono, Bambang
Journal of Earth and Marine Technology (JEMT) Vol 5, No 2 (2025)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2025.v5i2.6841

Abstract

We estimated surface deformation using SBAS-InSAR and the Mogi Source Model is then adopted to elucidate the mechanisms and spatial variability of surface deformation within the Semarang-Demak Alluvial Plain and its impacts on infrastructures. By analyzing predicted vertical and horizontal velocities, we identify intensive groundwater extraction as the primary driver of aquifer compaction, with vertical subsidence exceeding -120 mm/year and volume loss rates surpassing -6,000 m³/year in the urbanized Semarang-Demak region. These findings highlight the three-dimensional characteristics of deformation, forming a characteristic “bowl-shaped” pattern and revealing the sensitivity of infrastructure—expressways, railways, national roads, local roads, and airports—to high strain and tilt gradients. The integrated analysis thus underscores the necessity of sustainable groundwater management and adaptive land-use strategies to mitigate deformation-induced risks. This approach is crucial for safeguarding the long-term functionality and resilience of vital infrastructure in this subsidence-prone coastal region, guiding decision-makers toward strategic and sustainable development practices.
Co-Authors Azeriansyah, Reyhan Bambang Darmo Yuwono Ongky Anggara Satrio Muhammad Alif Siagian, Jenny Melynda