STUDI PEMANFAATAN DATA CITRA SATELIT SENTINEL-1A UNTUK MENGAMATI DEFORMASI PASCA GEMPA MENGGUNAKAN METODE DINSAR (Differential Interferometry Synthetic Aperture Radar) (Studi Kasus : Kabupaten Pesisir Barat, Lampung)

Calista, Astrid (2021) STUDI PEMANFAATAN DATA CITRA SATELIT SENTINEL-1A UNTUK MENGAMATI DEFORMASI PASCA GEMPA MENGGUNAKAN METODE DINSAR (Differential Interferometry Synthetic Aperture Radar) (Studi Kasus : Kabupaten Pesisir Barat, Lampung). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kabupaten Pesisir Barat merupakan salah satu kabupaten yang posisi wilayahnya berada diantara pertemuan dua lempeng tektonik yaitu lempeng Eurasia dan lempeng Indo-Australia. Hal tersebut menjadi salah satu faktor penyebab Kabupaten Pesisir Barat sering mengalami dampak gempa. Salah satu gempa yang cukup besar dengan kekuatan 6,9 SR terjadi pada Jumat, 02 Agustus 2019 pukul 19:03:25 WIB. Gempa tersebut mengakibatkan perubahan (deformasi) permukaan tanah. Seiring dengan perkembangan teknologi, pengukuran deformasi pasca gempa 02 Agustus 2019 di Kabupaten Pesisir Barat dapat dilakukan menggunakan metode Differential Interferometry Synthetic Aperture Radar (DInSAR). Pada penelitian ini, pengolahan dilakukan dengan sepasang citra satelit Sentinel-1A dengan tanggal akuisisi 1 Juni 2019 dan 23 Oktober 2019 serta DEM SRTM 3 Version 4. Kemudian, hasil pengolahan dengan metode DInSAR akan dianalisa terhadap data geologi dan data sesar. Hasil metode DInSAR menunjukkan deformasi sepanjang Line of Sight (LOS) memiliki nilai yang bervariatif dengan rentang -8.0 cm hingga 27,9 cm. Proses kalkulasi statistik mengindikasikan Kabupaten Pesisir Barat mengalami pengangkatan (uplift) permukaan tanah sebesar 3,1 cm hingga 14,4 cm selama periode pengamatan. Fenomena tersebut selaras dengan aktivitas tektonik dan batuan penyusun Kabupaten Pesisir Barat yaitu Batuan Gunung Api Kuarter, Batuan Simpang Aur, Lemau Formation¸dan Alluvium. Faktor lain yang selaras dengan fenomena tersebut ialah keberadaan Sumtran Fault dengan berbagai segment. Pada bagian akhir, penelitian metode DInSAR divalidasi terhadap penelitian terdahulu instansi LAPAN selama dua periode. Periode pertama (08 Desember 2017 – 23 Oktober 2019) memiliki nilai korelasi sebesar 0,762329793 dengan kekuatan korelasi sangat kuat. Sedangkan, periode kedua (1 Juni 2019 – 23 Oktober 2019) memiliki nilai korelasi sebesar 0,41482813 dengan kekuatan korelasi cukup. Selain itu, penelitian metode DInSAR ini divalidasi terhadap hasil processing DInSAR menggunakan software GMTSAR dengan periode penelitian 01 Juni 2019 – 23 Oktober 2019, dimana memiliki nilai korelasi sebesar 0,017399753 dengan kekuatan korelasi sangat rendah. ==================================================== Pesisir Barat Regency is one of the regencies whose territory is located between the confluence of two tectonic plates, namely the Eurasian plate and the Indo-Australian plate. Therefore, Pesisir Barat, Regency is often experience earthquake impacts. One of the fairly large earthquakes with a magnitude of 6,9 on the Richter Scale occurred on Friday, August 2, 2019 at 19 03 25 WIB. The earthquake resulted in changes (deformation) of the ground surface. Along with technological developments, measurements of post-earthquake deformation on August 2, 2019 in Pesisir Barat Regency can be carried out by using the Differential Interferometry Synthetic Aperture Radar (DInSAR) method from a pair of Sentinel-1A satellite images with acquisition dates of June 1, 2019 and October 23, 2019 as well as DEM SRTM 3 Version 4. Then, the results of processing with the DInSAR method will be analyzed compared to geological data and fault data. The results of the DInSAR method show that the deformation along the Line of Sight (LOS) has varying values with a range of -8.0 cm to 27.9 cm. The statistical calculation process indicated that Pesisir Barat Regency experienced an uplift of 3.1 cm to 14.4 cm during the observation period. This phenomenon is in line with the tectonic activity and rocks that compose the Pesisir Barat Regency, namely the Quaternary Volcanic Rocks, the Simpang Aur Rocks, Lemau Formation and Alluvium. Another factor that is in line with this phenomenon is the existence of the Sumatran Fault with various segments. At the end, the research of the DInSAR method was validated by comparing it to the previous research by the LAPAN agency for two periods. The first period (December 08, 2017 – October 23, 2019) has a correlation value of 0,762329793 with a very strong correlation strength. Meanwhile, the second period (1 June 2019 – 23 October 2019) has a correlation value of 0,41482813 with a moderate correlation strength. In addition, this DInSAR research method was also validated by being compared to the results of DInSAR processing using GMTSAR software with a research period of 01 June 2019 – 23 October 2019, which has a correlation value of 0,017399753 with a very low correlation strength.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Deformasi, DInSAR, Gempa Bumi, Pesisir Barat, Sentinel-1A, Deformation, DInSAR, Earthquake, Pesisir Barat, Sentinel-1A
Subjects: G Geography. Anthropology. Recreation > G Geography (General) > G70.5.I4 Remote sensing
Q Science > QE Geology > QE538.8 Earthquakes. Seismology
Q Science > QE Geology > QE604 Deformation
Divisions: Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29202-(S1) Undergraduate Thesis
Depositing User: ASTRID CALISTA
Date Deposited: 12 Aug 2021 06:51
Last Modified: 12 Aug 2021 06:51
URI: https://repository.its.ac.id/id/eprint/85580

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