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dc.contributor.authorStevens, Nathan Thomas
dc.date.accessioned2019-04-02T14:00:29Z
dc.date.available2021-01-02T07:00:31Z
dc.date.issued2018-12-30
dc.identifier.otherStevens_cornell_0058O_10448
dc.identifier.otherhttp://dissertations.umi.com/cornell:10448
dc.identifier.otherbibid: 10758043
dc.identifier.urihttps://hdl.handle.net/1813/64903
dc.description.abstractRecent earthquakes in north central Oklahoma are primarily hosted on unmapped faults in the crystalline basement but are sparse in the largest regional structure, the Nemaha uplift. This absence is despite the presence of numerous high-rate salt water disposal wells near large faults of the uplift. This thesis presents compressional (Vp) and shear (Vs) tomographic velocity models across the uplift using a new catalog of 25,601 local earthquakes recorded by 131 local seismic stations operating between 2013 and 2017. Seismic velocities are consistent with expected basement geology outside the uplift; Vp and Vs values are diminished by upwards of 2.5% within the uplift. The decrease in seismic velocity is interpreted to represent increased fault density and increased fluid volume within the uplift, with an associated increase in basement permeability. An increase in permeability may inhibit the buildup of fluid pressure within the uplift, possibly contributing to local aseismicity.
dc.language.isoen_US
dc.subjectinduced seismicity
dc.subjectOklahoma
dc.subjectDouble Difference Tomography
dc.subjectLocal Earthquake Tomography
dc.subjectShallow Crustal Structure
dc.subjectGeophysics
dc.subjectGeology
dc.titleHIGH RESOLUTION LOCAL EARTHQUAKE TOMOGRAPHY ACROSS THE NEMAHA UPLIFT, NORTH-CENTRAL OKLAHOMA, USA
dc.typedissertation or thesis
thesis.degree.disciplineGeological Sciences
thesis.degree.grantorCornell University
thesis.degree.levelMaster of Science
thesis.degree.nameM.S., Geological Sciences
dc.contributor.chairKeranen, Kathleen Mary
dc.contributor.committeeMemberLohman, Rowena B.
dcterms.licensehttps://hdl.handle.net/1813/59810
dc.identifier.doihttps://doi.org/10.7298/cfh7-gg40


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