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Geospatial Analysis of Surface Deformation Dynamics within the Rakutai Segment (2024) and the Response of Volcanic Deposits

Silmi Afina Aliyan ORCID
Hanipah Nurdini
Hendro Mutianto
Lili Somantri
Abstract
The Rakutai Segment of the Garsela Fault in West Java represents an active tectonic zone with persistent seismic activity. Throughout 2023–2024 a series of earthquakes was recorded, culminating in two notable events during 2024. The first, on 18 September 2024, reached 4.9 Mw and strongly affected the Bandung and Garut Regencies. The second occurred on 7 December 2024 with Mw 4.2, shaking seven districts in Garut. These events emphasize the importance of detailed geospatial analysis to understand surface deformation processes and the controlling geological factors. This study applies DInSAR using Sentinel-1 satellite data to detect and quantify ground-surface displacement with high spatial and temporal resolution. Interferometric results reveal significant deformation patterns distributed along the Rakutai Segment, indicating both uplift and subsidence that correspond closely to mapped lithological boundaries. Correlations between the occurrence and lithology in West Java indicate that rock type influences the magnitude of displacement and its spatial variability. Young units (Qgpk) are more susceptible to subsidence, while andesite–basaltic lavas are more resistant. These findings emphasize the role of rock physics in seismic response, the importance of field validation, and the use of geospatial approaches for monitoring, hazard mitigation, and infrastructure protection in Indonesia's active fault zones.
Keywords: Rakutai Segment, Garsela Fault, DInSAR, Surface Deformation, Volcanic Deposit.
References
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