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All Journal Jurnal Geocelebes Journal of The Physical Society of Indonesia
Agung Satria, Lori
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Earth & Planetary Sciences Physics

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Relocation of the Hypocenter of an Earthquake with the Double Difference Method in the Mentawai Hanifah Maulani, Siti; Refrizon, Refrizon; Samdara, Rida; Agung Satria, Lori; Ahadi, Suaidi
JURNAL GEOCELEBES Vol. 9 No. 2: October 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i2.43009

Abstract

This research aimed to accurately relocate the hypocenter of earthquakes in the Mentawai region to enhance precision in hypocenter determination. The arrival time data used were secondary data recorded in the seiscomp4 software at BMKG Class I Padang Panjang. The dataset comprised 66,979 arrival time data point form 2,380 earthquakes that occurred between September 2023 and September 2024. The Double-difference method, utilizing the Crust 2.0 velocity models, was employed for the relocation process. This method evaluated two hypocenters using a single recording station, provided that the distance between the hypocenters was less than the distance to the recording station. The HypoDD program was used for data processing. The relocation results indicated that the hypocenter had shifted and exhibited an increasing tendency toward cluster formation. The hypocenter depth was adjusted from an initial average of approximately 41.05 km to 51.05 km. This shift suggested am improvement in the quality of residual distribution. The enhancement of earthquake hypocenter resolution supported disaster mitigation by accelerating early warnings, improving construction safety in earthquake-prone areas, and optimizing emergency response. The relocation results in the Mentawai region identified 89 earthquake hypocenter points out of the 94 points recorded before relocation.
Co-Seismic Surface Deformation Associated with the 2 May 2025 Padang Panjang Earthquake Derived from Sentinel-1 DInSAR Khairunnisa, Khairunnisa; Ahadi, Suaidi; Agung Satria, Lori
Journal of the Physical Society of Indonesia Vol. 2 No. 1 (2026): April 2026
Publisher : The Physical Society of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35895/jpsi.2.1.1-11.2026

Abstract

This study analyzed surface deformation associated with the Mw 4.8 earthquake that occurred in Padang Panjang, West Sumatra, on May 2, 2025. The purpose of this research was to identify surface changes using Differential Interferometric Synthetic Aperture Radar (DInSAR) with Sentinel-1A imagery from the European Space Agency. The analysis covered the pre-earthquake period (April 8–May 2, 2025) and the post-earthquake period (May 2–June 7, 2025). The deformation values represented displacement along the satellite Line of Sight (LOS). The results showed a clear spatial change between the two periods. Before the earthquake, the area near the epicenter exhibited LOS displacement values of approximately +0.45 mm, while after the earthquake, the values decreased to around −0.045 mm, indicating relative subsidence along the LOS direction. The observed LOS displacement difference of about −0.495 mm suggested a surface response to seismic activity. However, the deformation magnitude was relatively small and may have been influenced by atmospheric effects, decorrelation, and interferometric noise. Therefore, the results were interpreted cautiously without strong tectonic attribution. This study demonstrated the capability of DInSAR to detect subtle surface deformation in seismic regions.
Co-Authors Hanifah Maulani, Siti Khairunnisa Khairunnisa Refrizon Refrizon Rida Samdara Suaidi Ahadi