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Ahmad Fauzi Pohan
Departemen Fisika, FMIPA, Universitas Andalas
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Identifikasi Segmen Talamau Menggunakan Kombinasi Data Satelit GGMPlus dan Koreksi SRTM2gravity Berdasarkan Analisis Second Vertical Derivative (SVD) Khairunnisa, Widya Indah; Pohan, Ahmad Fauzi
Jurnal Fisika Unand Vol 14 No 2 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.2.198-204.2025

Abstract

The existence of the Talamau segment was only identified by the BMKG after the earthquake that occurred on Friday morning 25 February 2022 in Talamau District, West Pasaman Regency. This earthquake had a magnitude of 6.1 Mw with 201 aftershocks. This research aims to determine the characteristics of the fault types of the Talamau segment using the gravity method. The gravity method can describe subsurface geological structures based on differences in rock density known as gravity anomalies. Gravity data is taken from satellite gravity data in the form of GGMplus data and SRTM2gravity topography data. The resulting gravity anomaly value can be used to determine the characteristics of the fault type using Second Vertical Derivative (SVD) analysis. The combination of GGMplus and SRTM2gravity data provides results that can describe the existence of the Talamau segment based on differences in rock density contrast. The existence of the Talamau segment is in a moderate anomalous pattern with the constituent components namely alluvium rock, gravel sand, silt, Talamau mountain rock, inseparable volcanic rock, intrusive rock, and Kuantan formation rock. From the SVD analysis, the characteristics of the fault type of the Talamau segment are also obtained, namely strike-slip faults.  
Implementasi Seismik Refraksi Metode Hagiwara untuk Pendeteksian Bidang Gelincir di Sempadan Sungai Daerah Perumahan Sungai Bangek Khaidir, Humaira Aryanti; Pohan, Ahmad Fauzi
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.554-560.2025

Abstract

The rapid development in the riparian zone of the Bangek River, Koto Tangah District, Padang City, has the potential to increase the risk of geological hazards such as landslides. This study aims to identify the subsurface structure and the presence of slip surfaces in the riverbank area that is being developed into a residential zone, using the Hagiwara method. Data acquisition was carried out along two survey lines, oriented perpendicular and parallel to the river, with offsets of 40 m and 30 m, respectively, employing four geophones and a 10 kg hammer as the seismic source. The interpretation results from the first survey line indicate that the subsurface consists of unsaturated sand and weathered layers, with evidence of a slip surface at a distance of 0–18 m and depths ranging from 0.7–4 m. This slip surface is located within a permeable layer with a low seismic velocity (368.955 m/s), overlain by an impermeable layer with a higher velocity (642.508 m/s). Meanwhile, the second survey line reveals a relatively homogeneous structure composed of weathered layers with varying densities. The Hagiwara interpretation identifies a slip surface along the second refractor, indicating potential slope instability within the first layer characterized by a low seismic velocity (449.165 m/s), suggesting weaker rock compaction. The information regarding the presence and depth of the slip surfaces identified in this study provides an important reference for development planning to mitigate the potential risk of landslides in the Bangek River riparian zone.
Co-Authors Adrial, Rico Afdal Afdal Afdal Afdal Afdal, Afdal Afdhal Muttaqin Afikatul Awaliyah Afikatul Awaliyah Aina’ul Mardiyah Alimin Mahyudin Ardian Putra Ariqah Ardelia Astuti Dahyunir Dahlan Damayanti, Elok Dedi Mardiansyah Desti Wury Andany Dian Fitriyani Dian Milvita Dwi Pujiastuti Dwi Puryanti Elistia Liza Namigo, Elistia Fani Anjelina Fani Anjelina Feriska Handayani Irka, Feriska Handayani Geby Sri Ayu Oktavia Harmadi Harmadi Harmadi Harmadi Ikhwan Safrima Illona giovanni, Vannessa Imam Taufiq Imam Taufiq Iqwal Ramadhan Khaidir, Humaira Aryanti Khairunnisa, Widya Indah Lathifah Fauziah M. Ali Shafii M. Arif Marzuki Marzuki Marzuki Marzuki Meqorry Yusfi Mhd. Kahfi Muhammad Khaikal Marbun Muldarisnur, Mulda Mutya Vonnisa Nadila Syarah Nadilla Syarah Nini Firmawati Nurul Annisa Nurul Annisa Nurul Annisa Oktavia, Geby Sri Ayu Puja Kasmailen Putri Ramacos Fardela Refky Adi Nata Ronal Floren Rusnoviandi, Rusnoviandi Solly Aryza Sri Handani Sri Oktamuliani Suryanto, Wiwit Syafira Aulina Refiani Trengginas Eka Putra Sutantyo Usna, Sri Rahayu Alfitri Wahyudi Wahyudi Wildian Wildian Windi Jalnadia Zulfi Zulfi Zulfi Zulfi Zulfi