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All Journal Jurnal Fisika Unand GEA, Jurnal Pendidikan Geografi Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geosains dan Teknologi Geodika: Jurnal Kajian Ilmu dan Pendidikan Geografi Journal of Earth and Marine Technology (JEMT) TeknoKreatif: Jurnal Pengabdian kepada Masyarakat GeoEco
Ongky Anggara
Teknik Geomatika, Institut Teknologi Sumatera
Humanities Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Physics Social Sciences Transportation Other

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Analysis Of Presumed Land Subsidence In The Cities Of Lampung Province Using InSAR And GNSS Data Alif, Satrio Muhammad; Anggara, Ongky; Perdana, Redho Surya; Hasannah, Uswatun; Azizah, Fadhillah Nur
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 3 (2024): JGEET Vol 09 No 03 : September (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.3.14096

Abstract

Land subsidence is a naturally occurring phenomenon that has become a growing concern in various regions, including Lampung Province. In this study, we investigate land subsidence in various cities within Lampung Province, Indonesia, utilizing Sentinel-1A using Sentinel-1A satellite image data from the period 2014 to 2022. The cities of Lampung Province analyzed in this study were Liwa, Kota Agung, Kalianda, Sukadana, Bandar Lampung and Krui. The method used is Interferometric Synthetic Aperture Radar (InSAR) with the Small Baseline Area Subset (SBAS) technique. Furthermore, to validate and improve the accuracy of land subsidence measurements, the Global Navigation Satellite System (GNSS) velocities were utilized. The land subsidence result obtained in this study is presumed land subsidence. The cities that experienced land subsidence was Kalianda, Sukadana, Bandar Lampung and Krui ranging from ~3 mm/yr to ~15 mm/yr. Meanwhile, the areas that experienced an uplift were the Liwa and Kota Agung cities.
Analysis Of Presumed Land Subsidence In The Cities Of Lampung Province Using InSAR And GNSS Data Alif, Satrio Muhammad; Anggara, Ongky; Perdana, Redho Surya; Hasannah, Uswatun; Azizah, Fadhillah Nur
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 3 (2024): JGEET Vol 09 No 03 : September (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.3.14096

Abstract

Land subsidence is a naturally occurring phenomenon that has become a growing concern in various regions, including Lampung Province. In this study, we investigate land subsidence in various cities within Lampung Province, Indonesia, utilizing Sentinel-1A using Sentinel-1A satellite image data from the period 2014 to 2022. The cities of Lampung Province analyzed in this study were Liwa, Kota Agung, Kalianda, Sukadana, Bandar Lampung and Krui. The method used is Interferometric Synthetic Aperture Radar (InSAR) with the Small Baseline Area Subset (SBAS) technique. Furthermore, to validate and improve the accuracy of land subsidence measurements, the Global Navigation Satellite System (GNSS) velocities were utilized. The land subsidence result obtained in this study is presumed land subsidence. The cities that experienced land subsidence was Kalianda, Sukadana, Bandar Lampung and Krui ranging from ~3 mm/yr to ~15 mm/yr. Meanwhile, the areas that experienced an uplift were the Liwa and Kota Agung cities.
Uji Signifikansi Stasiun GPS Kontinu dan Periodik dalam Identifikasi Pergerakan Koseismik Ongky Anggara; Satrio Muhammad Alif; Andhika Wahyu Pratama; Wendi Melvin Hutabarat
Jurnal Fisika Unand Vol 13 No 1 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.1.89-95.2024

Abstract

Pengukuran pergerakan bumi dengan menggunakan sistem GPS telah menjadi bagian penting dalam pemahaman deformasi kerak bumi yang berkaitan dengan aktivitas seismik. Dalam penelitian ini dilakukan uji   signifikansi dari stasiun GPS yang beroperasi secara kontinu dan periodik dalam mengidentifikasi pergerakan koseismik gempa Pesisir Barat pada 10 Maret 2020 (M5,8)   dan gempa Bengkulu pada 19 Agustus 2020 (M6,8). Pengolahan data GPS menggunakan perangkat lunak GAMIT/GLOBK yang bertujuan   untuk mendapatkan koordinat dan nilai pergeseran koseismik. Hasil penelitian menunjukan bahwa rata-rata titik tidak menunjukan pergeseran secara signifikan baik dari data GPS kontinu maupun data GPS periodik. Terdapat satu titik pengamatan yang menunjukkan   pergeseran secara signifikan yaitu stasiun pengamatan PRKB yang menunjukkan   pergeseran sebesar ~2-3 mm. Uji signifikansi dipengaruhi oleh nilai pergeseran koseismik dan standar deviasinya yang dipengaruhi mekanisme gempa. Uji signifikansi dari pengamatan stasiun GPS menunjukkan   tidak terdapat perbedaan baik dari data GPS secara kontinu maupun GPS secara periodik pada uji signifikansi karena   gempa yang diamati relatif kecil sehingga menghasilkan pergeseran koseismik yang relatif kecil.
Analisis Deformasi di Lampung dan Selat Sunda Berdasarkan Data GNSS tahun 2018 hingga 2021 Ongky Anggara; Muhammad Ario Eko Rahadianto; Satrio Muhammad Alif; Een Lujainatul Isnaini
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.637-643.2024

Abstract

The Lampung Province and Sunda Strait have a seismic gap zone with the potential for major earthquakes in the future. This study analyzes the deformation occurring in this region using continuous Global Navigation Satellite System (GNSS) station data from Indonesia Continuously Operating Reference Station (InaCORS) and Sumatran GPS Array (SuGAr) from 2018 to 2021.5. The GNSS data was processed using the Bernese 5.2 scientific software, applying least squares for velocity changes and statistical tests to analyze significance. The data processing was carried out in two schemes: the first scheme covering 2018-2020, and the second covering 2019-2021. The results of the deformation analysis from 2018 to 2021, using two continuous GNSS data processing schemes, showed velocity changes relative to the Sundaland Plate ranging from ~2 mm/year to ~20 mm/year. In the eastern region of the Sumatra fault, the velocity changes were smaller, around ~5 mm/year, due to the minimal influence of tectonic activity. However, in the Sunda Strait region, the deformation was influenced by volcanic activity. The deformation occurring in Lampung Province and the Sunda Strait, based on GNSS velocity changes, significantly contributes to tectonic and volcanic activities.
COSEISMIC DEFORMATION OF THE 2020 BENGKULU MW 6.8 EARTHQUAKE USING INSAR DATA Ongky Anggara; Satrio Muhammad Alif
GeoEco Vol 11, No 1 (2025): GeoEco January 2025
Publisher : Universitas Sebelas Maret (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/ge.v11i1.90987

Abstract

An earthquake with a seismic moment magnitude of Mw 6.8 occurred in Bengkulu province, located on the southwestern coast of Sumatra, on August 18, 2020. This study aims to assess the application of the differential interferometric synthetic aperture radar (DInSAR) method to detect and analyze coseismic deformation due to this earthquake using the Sentinel-1A radar satellite. The results of the DInSAR did not yield significant coseismic signals with the range of Line of Sight (LOS) displacement of ~-40 mm to ~40 mm. The InSAR data did not detect clear deformation patterns or displacements associated with the August 18, 2020 earthquake. Further investigations are needed to understand the limitations of InSAR in detecting coseismic signals for this specific event. Integrating these datasets can provide a more comprehensive understanding of the earthquake source, fault characteristics, and associated deformation patterns.
Co-Authors Aditya Rizqiansyah Andhika Wahyu Pratama Annisa Permata Sari, Annisa Permata Azizah, Fadhillah Nur Ching, Kuo-En Een Lujainatul Isnaini Een Lujainatul Isnaini Jenny Melynda Siagian Julianto, Romi Krama, Agel Vidian Muhammad Ario Eko Rahadianto Muhammad Ario Eko Rahadianto Nadzir, Zulfikar Adlan Perdana, Redho Surya Putri Ferlia Cahyani Satrio Muhammad Alif Satrio Muhammad Alif Satrio Muhammad Alif Satrio Muhammad Alif Satrio Muhammad Alif Siagian, Jenny Melynda Siburian, Yesica Tumim Siregar, Ribhan Nafiz Vidiya Ristiana Welly, Tri Kies Wendi Melvin Hutabarat