Localized waveform inversion applied to the D" region in teleseismic imaging

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dc.contributor.advisorLevander, Alan
dc.creatorHe, Yang
dc.date.accessioned2018-12-03T18:32:38Z
dc.date.available2018-12-03T18:32:38Z
dc.date.issued2009
dc.description.abstractA localized waveform inversion technique based on hybrid modeling was developed to investigate the shear wave velocity structure of the lowermost mantle. Utilizing ray theory and the Kirchhoff integral, the source wavefield from the hypocenter and the receiver wavefield recorded at the Earth's surface can be extrapolated to the subsurface near the core-mantle boundary (CMB). Ray theory solutions for a smooth background Earth model are interfaced to a finite difference solution to the wave equation applied in a local heterogeneous region near the CMB. The velocity structure in the finite difference region is updated iteratively by zero-lag cross-correlation of the forward and backward propagated wavefields that represents the direction of minimizing the data misfit. As the finite difference method is only applied in a small region, the hybrid method requires much less computer memory when it is implemented to invert localized structures. This method is applied to study an event recorded by the RISTRA Array and the depth and amplitude of the D" discontinuity is recovered. This demonstrates that the hybrid waveform inversion is feasible in teleseismic imaging.
dc.format.extent70 pp
dc.identifier.callnoTHESIS GEOL. 2009 HE
dc.identifier.citationHe, Yang. "Localized waveform inversion applied to the D" region in teleseismic imaging." (2009) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/103687">https://hdl.handle.net/1911/103687</a>.
dc.identifier.digital304988856
dc.identifier.urihttps://hdl.handle.net/1911/103687
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.subjectEarth sciences
dc.titleLocalized waveform inversion applied to the D" region in teleseismic imaging
dc.typeThesis
dc.type.materialText
thesis.degree.departmentEarth Science
thesis.degree.disciplineNatural Sciences
thesis.degree.grantorRice University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science
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