Timur, Annisa Rahmawati (2024) Analisis SBAS-InSAR Dan Koreksi Kesalahan Unwrapping Untuk Pengamatan Deformasi Pada Patahan Aktif. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kabupaten Pasuruan merupakan salah satu wilayah di Pulau Jawa yang dilewati oleh patahan aktif di zona back-arc basin Jawa Timur bagian Utara. Studi mengenai patahan di Kabupaten Pasuruan menyatakan bahwa terdapat patahan dangkal dengan potensi gempa minimum 6.6 Mw. Metode geodetik yang umum digunakan untuk identifikasi patahan aktif adalah penginderaan jauh menggunakan satelit SAR. Penelitian ini menggunakan data SAR Sentinel 1A untuk memetakkan deformasi akibat pergerakan tektonik. Pengolahan Timeseries-InSAR dengan teknik SBAS-InSAR akan menghasilkan nilai beda fase yang menjadi nilai kecepatan deformasi, dengan koreksi unwrapping dan koreksi troposfer diaplikasikan pada SBAS-InSAR. Teknik ini diaplikasikan menggunakan perangkat lunak ISCE dan MintPy untuk mendapatkan nilai deformasi berupa mean LOS velocity di sekitar Kabupaten Pasuruan pada Maret 2017 hingga Juni 2022.
Analisis data deformasi tanah di wilayah Patahan Pasuruan menunjukkan variasi kecepatan deformasi pada arah Line of Sight (LOS), berkisar antara -50 mm/tahun hingga 30 mm/tahun. Secara deformasi vertikal sisi barat daya atau selatan patahan (hanging wall) mengalami penurunan muka tanah hingga 0,3 mm/tahun, sementara sisi utara ke timur laut (footwall) mengalami sedikit kenaikan hingga 0,1 mm/tahun. Koreksi phase unwrapping dan atmosfer menggunakan data ERA5 dan GACOS terbukti efektif, menghasilkan distribusi kecepatan deformasi yang lebih homogen dan konsisten, serta menurunkan standar deviasi dari nilai kecepatan deformasi.
Kata kunci: Deformasi, SBAS-InSAR, MintPy, Koreksi Unwrapping dan atmosfer, Patahan Pasuruan
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Pasuruan Regency is one of the regions on Java Island traversed by an active fault in the northern part of the East Java back-arc basin. Studies on the faults in Pasuruan Regency indicate the presence of a shallow fault with a minimum earthquake potential of 6.6 Mw. A common geodetic method used for identifying active faults is remote sensing using SAR satellites. This study utilizes Sentinel 1A SAR data to map deformation caused by tectonic movements. Time-series InSAR processing with the SBAS-InSAR technique will yield phase difference values, which are converted into deformation velocities, with unwrapping and tropospheric corrections applied to SBAS-InSAR. This technique is implemented using ISCE and MintPy software to obtain mean LOS velocity deformation values around Pasuruan Regency from March 2017 to June 2022.
The analysis of ground deformation data in the Pasuruan Fault area shows significant variations in deformation velocity along the Line of Sight (LOS), ranging from -50 mm/year to 30 mm/year. Vertically, the southwest or southern side of the fault (hanging wall) experiences ground subsidence up to 0.3 mm/year, while the northern to northeastern side (footwall) experiences a slight uplift up to 0.1 mm/year. The application of phase unwrapping and atmospheric corrections using ERA5 and GACOS data has proven effective, resulting in more homogeneous and consistent deformation velocity distributions and reducing the standard deviation of deformation velocity values.
Keywords: Deformation, SBAS-InSAR, MintPy, Unwrapping and atmospheric correction, Pasuruan Fault
Item Type: | Thesis (Masters) |
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Uncontrolled Keywords: | Kata kunci: Deformasi, SBAS-InSAR, MintPy, Koreksi Unwrapping dan atmosfer, Patahan Pasuruan ==================== Keywords: Deformation, SBAS-InSAR, MintPy, Unwrapping and atmospheric correction, Pasuruan Fault |
Subjects: | G Geography. Anthropology. Recreation > G Geography (General) > G70.217 Geospatial data G Geography. Anthropology. Recreation > G Geography (General) > G70.5.I4 Remote sensing |
Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Geomatics Engineering > 29101-(S2) Master Theses |
Depositing User: | Annisa Rahmawati Timur |
Date Deposited: | 31 Jul 2024 05:40 |
Last Modified: | 31 Jul 2024 05:40 |
URI: | http://repository.its.ac.id/id/eprint/110052 |
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