The mapping of tectonic features in the ocean basins from satellite altimetry data

dc.contributor.advisorNot available
dc.creatorGahagan, Lisa Marie, 1963-
dc.date.accessioned2018-10-02T20:06:27Z
dc.date.available2018-10-02T20:06:27Z
dc.date.issued1988-05
dc.description.abstractSatellite altimetry data provide information on the height variations of the sea surface. The angle between a line perpendicular to the sea surface and a vertical line between the satellite and the sea surface is referred to as the deflection of the vertical and is equal to the first derivative of the sea surface. This study examines two theoretical models describing the relationship between the deflection of the vertical data and the bathymetry 1) across a fracture zone in a large age-offset, fast-spreading regime and 2) across a fracture zone in a small age-offset, slow-spreading regime. The models are respectively compared to the observed relationship 1) across the Mendocino Fracture Zone which is in a large age-offset, fast-spreading regime and 2) across the DuToit Fracture Zone which is in a medium age-offset, slow-spreading regime. The strong agreement between the theoretical models and the observed relationships suggests that the models can be used with the deflection of the vertical data to locate fracture zones in known regimes. The angle between the trend of a feature and the trend of the satellite track affects the deflection of the vertical signal. As the angle becomes smaller, the amplitude of the deflection of the vertical signal, which varies with the sine of this angle, decreases and the wavelength of the signal increases. Once the feature is parallel to the track, there is no deflection of the vertical signal. The deflection of the vertical signal is also affected by the direction the satellite travels. If the feature trends between the ascending and descending tracks of the satellite, then the satellite will cross the feature from opposite directions and the ascending and descending signals will be opposite to each other. If the feature does not trend between the ascending and descending tracks, then the satellite will cross the feature from the same side and the deflection of the vertical signal will be similar for both the ascending and descending data sets. A third factor affecting the deflection of the vertical signal is the latitude at which the feature is located. The trend of the satellite track varies as a function of latitude, ranging from 18° at 0° latitude to 64.6° at 70° latitude. Because the trend of the satellite track varies, not only does the angle between the trend of a feature and the trend of the satellite track vary with latitude, but the amplitude of the deflection of the vertical signal varies with latitude as well.en_US
dc.description.departmentEarth and Planetary Sciencesen_US
dc.format.mediumelectronicen_US
dc.identifierdoi:10.15781/T2ZW19B5Q
dc.identifier.urihttp://hdl.handle.net/2152/68637
dc.language.isoengen_US
dc.relation.ispartofUT Electronic Theses and Dissertationsen_US
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en_US
dc.rights.restrictionOpenen_US
dc.subject.lcshOcean bottom
dc.subject.lcshGeology, Structural
dc.subject.lcshPlate tectonics
dc.subject.lcshSubmarine geology
dc.subject.lcshAltimeter
dc.subject.lcshArtificial satellites in geographical research
dc.titleThe mapping of tectonic features in the ocean basins from satellite altimetry dataen_US
dc.typeThesisen_US
dc.type.genreThesisen_US
thesis.degree.departmentGeological Sciencesen_US
thesis.degree.disciplineGeological Sciencesen_US
thesis.degree.grantorUniversity of Texas at Austinen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Artsen_US

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