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p-Index From 2021 - 2026
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All Journal Journal of Geoscience, Engineering, Environment, and Technology
Faridha Aprilia
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Earth & Planetary Sciences Engineering Environmental Science Physics

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Deformation Of Lava Tounge at Semeru Volcano using Sentinel-1 DInSAR Chandra, Yuliana Iik Iswanti; Maryanto, Sukir; Susilo, Adi; Faridha Aprilia; Mayang Bunga Puspita
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 1 (2025): JGEET Vol 10 No 01 : March (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.1.21444

Abstract

Indonesia is vulnerable to various natural disasters, especially volcanic eruptions.  Mount Semeru, located between Malang and Lumajang, is an active volcano with a history of significant eruptions.  The eruption on December 4, 2021, caused many casualties and infrastructure damage.  This research utilizes Sentinel-1 (SLC) satellite imagery to analyze deformation changes caused by the eruption, with a particular focus on DInSAR analysis to depict changes in the crater's shape.  Before the eruption, no significant volcanic activity was detected, resulting in no clear deformation changes, with a deflation range between -0.096 cm and -0.145 cm.  However, during the eruption, the outflow of lava forming lava tongues led to the formation of lava deposits that affected surface deformation.  During the eruption phase, the deformation changes indicate an inflation phase, with values ranging from 0.064 cm to 0.094 cm, reflecting surface movement due to the accumulation of volcanic material.  After the eruption, the deformation changes became more pronounced due to the perfectly and stably formed lava deposits, with an inflation value range between 0.037 cm and 0.079 cm, resulting in significant surface shifts.  Phase reading disturbances were also detected at several locations due to lahar flows that occurred during and after the eruption.  The results of this study provide beneficial information for the relevant parties in formulating disaster mitigation strategies related to Mount Semeru's activities, as well as in understanding the dynamics of surface deformation influenced by eruptions, lava flows, and the formation of lava tongues.
Preliminary Study of Geo-Magnetic Phenomena at The Arjuno–Welirang Volcano, Indonesia Adinda Salsabilla Raindraputri Hidayat; Sukir Maryanto; Faridha Aprilia; Elizza Inaya Permata Sari; Athorhab, Iskara Hadijah Aqila Nasywa Rastramata
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.02.26130

Abstract

Mount Arjuno–Welirang is an active volcano in East Java that exhibits volcanic activity in the form of shallow and deep earthquakes, as well as fumarolic emissions. This study aims to monitor the subsurface dynamics of the volcano through the integration of magnetic and seismic methods. Magnetic field measurements were carried out using a proton precession magnetometer to obtain local magnetic anomalies after applying diurnal corrections, IGRF correction, and regional–residual anomaly separation. The RTP and residual maps reveal high-anomaly zones that are interpreted as shallow magma intrusions, as well as low-anomaly zones associated with hydrothermal alteration and fracturing. These interpretations are integrated with the lithology of the Qvaw Formation, which consists of lava, volcanic breccia, and tuff. In addition, MAGDAS data were used to analyze diurnal geomagnetic variations (H, D, Z), which show significant fluctuations during certain periods, indicating local geomagnetic disturbances likely influenced by seismic activity or subsurface geological processes. The combination of magnetic and seismic methods provides a more comprehensive understanding of magma pathways, hydrothermal fluid dynamics, and potential increases in volcanic activity, thereby supporting disaster mitigation efforts in the Arjuno–Welirang region.
Co-Authors Adi Susilo Adinda Salsabilla Raindraputri Hidayat Athorhab, Iskara Hadijah Aqila Nasywa Rastramata Chandra, Yuliana Iik Iswanti Elizza Inaya Permata Sari Mayang Bunga Puspita Sukir Sukir