Three-dimensional traveltime tomography at a shallow groundwater contamination site

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dc.contributor.advisorZelt, Colin A.
dc.creatorAzaria, Aron
dc.date.accessioned2009-06-04T08:22:10Z
dc.date.available2009-06-04T08:22:10Z
dc.date.issued2003
dc.description.abstractI performed traveltime tomography on a 3-D seismic refraction dateset collected at Hill Air Force Base, Utah in 2000. The survey covers a 95m by 36m area over a contaminated aquifer that is bounded below by a clay aquiclude, in which a paleochannel acts as a trap for the contaminants. Presented are results using an iterative, nonlinear, traveltime tomographic approach applied to 187,877 traveltimes. The resulting velocity model shows that the near-surface velocity increases by roughly a factor of 5 in the upper 15m, from about 300m/s to 1500m/s. Cross-sections through the model show a north-south trending low-velocity feature interpreted to be the channel structure. Checkerboard tests applied to the velocity model establishes a 7.5m lateral resolution throughout most of the depth range of interest. While the long wavelength features of the model reveal the paleo-channel, the velocity model is likely a broad and smooth characterization of the true velocity structure.
dc.format.extent119 p.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.callnoTHESIS GEOL. 2003 AZARIA
dc.identifier.citationAzaria, Aron. "Three-dimensional traveltime tomography at a shallow groundwater contamination site." (2003) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/17572">https://hdl.handle.net/1911/17572</a>.
dc.identifier.urihttps://hdl.handle.net/1911/17572
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectGeophysics
dc.subjectEnvironmental engineering
dc.titleThree-dimensional traveltime tomography at a shallow groundwater contamination site
dc.typeThesis
dc.type.materialText
thesis.degree.departmentEarth Science
thesis.degree.disciplineNatural Sciences
thesis.degree.grantorRice University
thesis.degree.levelMasters
thesis.degree.nameMaster of Arts
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