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Memorial University - Electronic Theses and Dissertations 5
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Document Description
TitleTravel-time seismic inversion for a numerically-defined shape
AuthorKoops, Joel P., 1984-
DescriptionThesis (M.Sc.)--Memorial University of Newfoundland, 2011. Earth Sciences
Paginationxii, 102 leaves : col. ill., +1 CD-ROM (4 3/4 IN.)
SubjectSeismic traveltime inversion--Mathematical models; Seismic waves--Speed--Mathematical models; Three-dimensional display systems
Degree GrantorMemorial University of Newfoundland. Earth Sciences Programme
DisciplineEarth Sciences
NotesBibliography: leaves 91-93.
AbstractTravel time tomography calculations involving 3D velocity models have become more common place during the past decade or so. Numerous methods have been developed to solve the required forward modeling problem of boundary value ray tracing in 3D. For this problem, source and receiver positions are known and one or more time paths are sought between the fixed end points. Less attention has been given to the approach to model parametrization. Traditionally, the model has been subdivided into constant velocity cells, a process known as voxellation or cellular partitioning. A new approach to model parametrization involving numerically constructing the boundary of a homogeneous subsurface geological feature is proposed here and an efficient method for tracing rays through this model is presented. The ray tracing problem is solved by obtaining the minimum travel time path from a fixed source to a fixed receiver, and its associated travel time, as the solution to a nonlinear optimization problem based on Fermat's principle. The inversion technique will be regulated by using the area, perimeter and the total distance from each vertex to the center of the numerically defined surface as measures of model structure.
Resource TypeElectronic thesis or dissertation
FormatImage/jpeg; Application/pdf
SourcePaper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Accompanying Files
RightsThe author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
CollectionElectronic Theses and Dissertations
Scanning StatusCompleted
PDF File(4.12 MB) --
CONTENTdm file name38586.cpd