Memorial University DAI: Travel-time seismic inversion for a numerically-defined shape

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Title	Travel-time seismic inversion for a numerically-defined shape
Author	Koops, Joel P., 1984-
Description	Thesis (M.Sc.)--Memorial University of Newfoundland, 2011. Earth Sciences
Date	2011
Pagination	xii, 102 leaves : col. ill., +1 CD-ROM (4 3/4 IN.)
Subject	Seismic traveltime inversion--Mathematical models; Seismic waves--Speed--Mathematical models; Three-dimensional display systems
Degree	M.Sc.
Degree Grantor	Memorial University of Newfoundland. Earth Sciences Programme
Discipline	Earth Sciences
Language	Eng
Notes	Bibliography: leaves 91-93.
Abstract	Travel 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.
Type	Text
Resource Type	Electronic thesis or dissertation
Format	Image/jpeg; Application/pdf
Source	Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Accompanying Files	http://collections.mun.ca/theses_extras/Koops_JoelP.zip
Rights	The 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.
Collection	Electronic Theses and Dissertations
Scanning Status	Completed
PDF File	(4.12 MB) -- http://collections.mun.ca/PDFs/theses/Koops_JoelP.pdf
CONTENTdm file name	38586.cpd