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Title: Optical sub-pixel matching and active tectonics
Author: Barišin, Ivana
ISNI:       0000 0004 6346 4320
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2015
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In this thesis I use sub-pixel optical matching, Interferometric Synthetic Aperture Radar (InSAR), and Light Detection and Ranging (lidar) spatial geodetic observations to produce reliable 3D displacement fields caused by co-seismic events and reliable earthquake source models with slip distribution on fault planes. I produce horizontal displacement maps for the 2005 Dabbahu segment, Afar using SPOT4 satellite images. By combining InSAR descending data and range offsets with optical sub-pixel I produced a vertical displacement map of the event. I attempted to perform the inversion of the dataset obtained by sub-pixel matching but I found that datasets are not well suited for the typical numerical inversion, and I fit data with direct dislocation modelling instead. I identify biases and errors that arise from optical sub-pixel matching of satellite images using many horizontal datasets constructed using SPOT5 images for the El Mayor-Cucapah earthquake. I develop algorithms for removal of some of these biases from horizontal displacement maps. Using sub-pixel matching I asses the quality of several DEMs available to me for study of the El Mayor-Cucapah earthquake. I developed a novel technique for producing vertical displacement maps caused by an earthquake by combining archived pre-event satellite images with post event acquired lidar. I use this technique to produce a vertical displacement map of the El Mayor-Cucapah earthquake. I produce a source model of the El Mayor-Cucapah earthquake by inverting InSAR datasets using the method. After attempts to do joint inversion of InSAR and optical sub-pixel matching I developed the code to use Bayesian inversion instead, because its advantages when it comes to joint modelling of datasets. I sucessfully invert four InSAR datasets on seven fault planes using the Bayesian approach. I found that the results of the Bayesian inversion are very similar to the results of the optimization inversion.
Supervisor: Parsons, Barry ; Dowman, Ian Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available