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dc.contributor.authorNale, Stephanie M.
dc.date.accessioned2018-04-26T14:16:52Z
dc.date.available2018-04-26T14:16:52Z
dc.date.issued2017-08-30
dc.identifier.otherNale_cornell_0058O_10165
dc.identifier.otherhttp://dissertations.umi.com/cornell:10165
dc.identifier.otherbibid: 10361537
dc.identifier.urihttps://hdl.handle.net/1813/56860
dc.description.abstractThe fortuitous location of the Shumagin Islands above the seismogenic zone in the Alaska-Aleutian subduction zone provides an ideal opportunity to study seismic waves directly from the megathrust interface. Double-difference relative relocation of hypocenters are performed on a catalog of earthquakes from the Shumagin Gap spanning nearly a decade. Relocation results show an abrupt transition in seismicity along the plate interface at 44 km depth, from a distinct 4 – 8 km thick plane to a broad zone of sparse seismicity. In the eastern area of the network, deeply rooted faults appear to cut into the downgoing plate, dipping steeply trenchward. Active faults within the upper plate seem to correlate with the strike of mapped normal faults and a splay fault imaged within an MCS reflection profile in the Eastern Sanak Basin. Further investigation of these splay faults may provide important information relating to tsunamigensis in the Shumagin Gap.
dc.language.isoen_US
dc.subjectPlate tectonics
dc.subjectGeophysics
dc.subjectEarthquake Relocation
dc.subjectSeismogenic Zone
dc.subjectShallow Subduction Interface
dc.subjectShumagin Gap
dc.subjectSubduction zones
dc.titleDISTRIBUTION OF SEISMICITY ON THE MEGATHRUST: CHARACTERIZING THE SEISMOGENIC ZONE IN THE SHUMAGIN GAP, ALASKA WITH PRECISE EARTHQUAKE LOCATIONS
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.committeeMemberAbers, Geoffrey Alexander
dc.contributor.committeeMemberAllmendinger, Richard Waldron
dcterms.licensehttps://hdl.handle.net/1813/59810
dc.identifier.doihttps://doi.org/10.7298/X45H7DD0


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