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Using waveform modeling of seismic anisotropy to understand the process of Proterozoic lithospheric assembly

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dc.contributor.authorSolomon, Melinda A., author
dc.contributor.authorSchutt, Derek L., advisor
dc.contributor.authorHarry, Dennis, committee member
dc.contributor.authorHannah, Judy, committee member
dc.contributor.authorBreidt, Jay, committee member
dc.date.accessioned2007-01-03T05:33:59Z
dc.date.available2007-01-03T05:33:59Z
dc.date.issued2013
dc.description.abstractIn this study, SKS data from two long-standing broadband seismic stations located along the Proterozoic Trans Hudson Orogen is analyzed for the effects of complex anisotropy. The Trans Hudson Orogen is the lasting expression of collisional events that brought together Archean continental fragments to form the cratonic core of the North American continent. Split SKS waveforms observed at two GSN stations, FFC located on the Sask craton near Flin Flon, Manitoba, and RSSD located on the eastern margin of the Wyoming craton in the Black Hills of South Dakota, are analyzed for anisotropic layering of varying complexity. At FFC we find that a model with two flat layers of anisotropy is better able to explain the data than the simple model of one flat layer. A top layer shows anisotropy perpendicular to the convergence direction of the Trans Hudson Orogen that is similar to observations of anisotropy today at convergent margins, and is attributed to lithospheric deformation during convergence. RSSD shows more complex splitting that we interpret as sub-wavelength scale anisotropic heterogeneity resulting from convergence driven fragmentation of the pre-existing lithosphere into small, < ~40 km pieces. Previous studies show more coherent anisotropy to the east and west of RSSD, suggesting that anisotropic heterogeneity here is related to the convergence, and may be a longstanding feature of tectonic boundaries.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierSolomon_colostate_0053N_11592.pdf
dc.identifier.urihttp://hdl.handle.net/10217/79186
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectanisotropy
dc.subjectSKS
dc.subjectseismology
dc.titleUsing waveform modeling of seismic anisotropy to understand the process of Proterozoic lithospheric assembly
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineGeosciences
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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