Crustal Deformation of the Kendeng Fault Branches Area From GNSS and InSAR Data and Its Earthquake Potential in Surabaya City, Indonesia

Ayani, Raudlah Hawin (2021) Crustal Deformation of the Kendeng Fault Branches Area From GNSS and InSAR Data and Its Earthquake Potential in Surabaya City, Indonesia. Masters thesis, Institut Teknologi Sepuluh Nopember.

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03311850010005_Raudlah_Thesis.pdf - Accepted Version
Restricted to Repository staff only

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Abstract

Slip rates on active faults derived from the interseismic velocity field are critical to understanding seismic hazards in metropolitan cities. This study integrated the data from the Global Navigation Satellite System (GNSS) and Interferometric Synthetic Aperture Radar (InSAR) to evaluate the interseismic velocities in the second-largest city in Indonesia, Surabaya, where branches of the Kendeng fault (the Surabaya fault and the Waru fault) pass through. Data from 16 campaign-mode GNSS stations collected between 2017 and 2020 from previous research are reprocessed to estimate the velocity field. Horizontal velocities under the ITRF frame range between -23.8 mm/yr and 47.9 mm/yr toward the southeast. Vertical velocities generally range between -1.3 mm/yr and -112.2 mm/yr. Sentinel-1A SAR data of both ascending and descending tracks acquired between November 2014 and July 2020 were used to generate the interferograms with the InSAR Scientific Computing Environment (ISCE) software. Furthermore, cumulative displacement time series were constructed using the Small BAseline Subset (SBAS) technique within the Generic InSAR Analysis Toolbox (GIAnT). This study also carried out the detection of outlier SAR epochs to improve the precision of Line-of-sight (LOS) velocity estimates. The LOS velocities range from -14.8 to 10.8 mm/yr in the ascending track and from -12.7 to 9.5 mm/yr in the descending track. The GNSS and InSAR LOS velocities can reconstruct 3D displacement fields, revealing the Kendeng fault activity to understanding seismic risks in the Surabaya area.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Keywords: Interseismic Velocity, Sentinel-1A, SBAS, Atmospheric Correction, Inversion, Tectonic Implication. Kata kunci: Kecepatan Interseismik, Sentinel-1A, Koreksi Atmosfir, Inversion, Implikasi Tektonik
Subjects: G Geography. Anthropology. Recreation > G Geography (General) > G109.5 Global Positioning System
G Geography. Anthropology. Recreation > G Geography (General) > G70.5.I4 Remote sensing
Q Science > QE Geology > QE538.8 Earthquakes. Seismology
Q Science > QE Geology > QE601 Geology, Structural
Q Science > QE Geology > QE604 Deformation
Divisions: Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29101-(S2) Master Thesis
Depositing User: Raudlah Hawin Ayani
Date Deposited: 19 Aug 2021 08:52
Last Modified: 19 Aug 2021 08:52
URI: https://repository.its.ac.id/id/eprint/87868

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