Deformasi 2d Gempa Bumi Lombok 5 Agustus 2018 Dengan Metode Differential Interferometric Synthetic Aperture Radar Menggunakan Citra Sentinel-1A.

Nuryani, Hesty Wahyu (2022) Deformasi 2d Gempa Bumi Lombok 5 Agustus 2018 Dengan Metode Differential Interferometric Synthetic Aperture Radar Menggunakan Citra Sentinel-1A. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pulau Lombok merupakan salah satu Pulau yang berada pada area yang menjadi sumber gempa seperti Zona Back Arc Thrust, Megathrust dan sistem sesar geser. Serangkaian gempa melanda wilayah Pulau Lombok salah satu yang cukup besar dengan kekuatan Mw 6,9 terjadi pada Minggu, 5 Agustus 2018 pukul 18:46:37 WIB. Setelah adanya rangkaian gempa bumi yang terjadi di Pulau Lombok terjadi perubahan bentuk, perubahan posisi dan orientasi maupun ukuran disebut dengan deformasi. Untuk mengetahui deformasi yang terjadi pasca gempa dengan wilayah yang memiliki cakupan area cukup besar maka metode penginderaan jauh aktif menjadi metode yang paling efisien. Penelitian ini menggunakan metode DInSAR two-pass interferometry dengan data citra Satelit Sentinel-1A arah ascending dan descending yang kemudian dilakukan proses dekomposisi Line of Sight (LOS) ke 2D vektor vertikal dan arah barat-timur dan dilakukan validasi dengan pemodelan Okada. Hasil pengolahan DInSAR pada citra ascending menunjukkan deformasi berupa uplift atau kenaikan permukaan tanah hingga 0.122 meter dan terjadi subsidence atau penurunan permukaan tanah hingga -0.172 meter. Untuk hasil pengolahan citra descending menunjukkan deformasi berupa uplift hingga 0.109 meter dan terjadi subsidence hingga -0.169 meter. Dari hasil tersebut wilayah yang mengalami deformasi cukup signifikan adalah wilayah Lombok Utara. Displacement arah vertikal hasil dekomposisi LOS ke 2D memiliki rentang nilai deformasi -0.141 hingga 0.088 meter sedangkan untuk arah barat-timur memiliki rentang nilai -0.034 hingga 0.049 meter. Sedangkan dari perhitungan nilai koefisien korelasi nilai deformasi hasil dekomposisi dan validasi okada memiliki korelasi yang kuat yaitu 0.93341015 untuk arah vertikal dan 0.43782683 untuk arah barat-timur.
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Lombok Island is one of the islands located in an area that is a source of earthquakes such as the Back Arc Thrust Zone, Megathrust and shear fault systems. A series of earthquakes hit the Lombok Island area, one of which was quite large with a magnitude of Mw 6.9, which occurred on Sunday, August 5, 2018 at 18:46:37 WIB. After a series of earthquakes that occurred on the island of Lombok there was a change in shape, change in position and orientation as well as in size called deformation. To determine the post-earthquake deformation with an area that has a large enough coverage area, the active remote sensing method is the most efficient method. This study uses the DInSAR two-pass interferometry method with data from the ascending and descending Sentinel-1A Satellite imagery which is then decomposed into 2D Line of Sight (LOS) vertical vectors and west-east directions and validated with Okada modeling. The results of DInSAR processing on the ascending image show deformation in the form of an uplift or land level rise of up to 0.122 meters and a subsidence or land subsidence of up to -0.172 meters. The descending image processing results show deformation in the form of uplift up to 0.109 meters and subsidence up to -0.169 meters. From these results, the area that experienced significant deformation was the North Lombok region. The vertical displacement of the LOS to 2D decomposition has a deformation value range of -0.141 to 0.088 meters while the west-east direction has a value range of -0.034 to 0.049 meters. Meanwhile, from the calculation of the correlation coefficient, the deformation value of the decomposition results and Okada validation has a strong correlation, namely 0.93341015 for the vertical direction and 0.43782683 for the west-east direction.

Item Type:	Thesis (Other)
Additional Information:	RSG 621.367 8 Nur d-1 2022
Uncontrolled Keywords:	Ascending, Deformasi, Dekomposisi, Descending, DInSAR. Ascending, Deformation, Decomposition, Descending, DInSAR.
Subjects:	G Geography. Anthropology. Recreation > G Geography (General) > G70.5.I4 Remote sensing
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29202-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	20 May 2026 04:14
Last Modified:	20 May 2026 04:14
URI:	http://repository.its.ac.id/id/eprint/133271

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