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dc.creatorTrehu, Anne M.en_US
dc.creatorScheidhauer, Marenen_US
dc.creatorRohr, Kristin M. M.en_US
dc.creatorTikoff, Basilen_US
dc.creatorWalton, Maureen A. L.en_US
dc.creatorGulick, Sean P. S.en_US
dc.creatorRoland, Emily C.en_US
dc.date.accessioned2016-10-28T19:51:57Z
dc.date.available2016-10-28T19:51:57Z
dc.date.issued2015-05en_US
dc.identifierdoi:10.15781/T2W08WK2H
dc.identifier.citationTréhu, Anne M., Maren Scheidhauer, Kristin MM Rohr, Basil Tikoff, Maureen AL Walton, Sean PS Gulick, and Emily C. Roland. "An abrupt transition in the mechanical response of the upper crust to transpression along the Queen Charlotte fault." Bulletin of the Seismological Society of America (May., 2015).en_US
dc.identifier.issn0037-1106en_US
dc.identifier.urihttp://hdl.handle.net/2152/43270
dc.description.abstractThe Queen Charlotte Fault (QCF) is a major strike-slip fault that forms the boundary between the Pacific and North American plates from 51 degrees to 58 degrees N. Near 53.2 degrees N, the angle of oblique convergence predicted by the Mid-Ocean Ridge VELocity (MORVEL) interplate pole of rotation decreases from > 15 degrees in the south to < 15 degrees in the north. South of 53.2 degrees N, the convergent component of plate motion results in the formation of a 40 km wide terrace on the Pacific plate west of QCF and earthquakes with thrust mechanisms (including the 2012 Haida Gwaii earthquake sequence) are observed. North of 53.2 degrees N, in the primary rupture zone of the M 8.1 strike-slip earthquake of 1949, the linear terrace disappears, and topography of the continental slope west of the QCF is characterized by a complex pattern of ridges and basins that trend obliquely to the primary trace of the QCF. Deformation within the Pacific plate appears to occur primarily through strike-slip faulting with a minor thrust component on secondary synthetic faults. The orientations of these secondary faults, as determined from seismic reflection and bathymetric data, are consistent with the reactivation of faults originally formed as ridge-parallel normal faults and as thrust faults formed parallel to the QCF south of the bend at 53.2 degrees N and subsequently translated to the north. We suggest that an oblique convergence angle of 15 degrees represents a critical threshold separating distinct crustal responses to transpression. This result is consistent with theoretical and analog strain models of transpressive plate boundaries. The sharpness of this transition along the QCF, in contrast to purely continental transform boundaries, may be facilitated by the relatively simple structure of oceanic crust and the presence of pre-existing, optimally oriented faults in the young Pacific plate.en_US
dc.description.sponsorshipNational Science Foundation (NSF) EAR-9219870, EAR-9527011en_US
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectsan-andreas faulten_US
dc.subjectislands refraction projecten_US
dc.subjectcurrent plate motionsen_US
dc.subjectstrike-slip faultsen_US
dc.subjectcentral californiaen_US
dc.subjecttransform marginen_US
dc.subjectanalog modelsen_US
dc.subjectpacific plateen_US
dc.subjectdeformationen_US
dc.subjectearthquakeen_US
dc.subjectgeochemistry & geophysicsen_US
dc.titleAn Abrupt Transition in the Mechanical Response of the Upper Crust to Transpression Along the Queen Charlotte Faulten_US
dc.typeArticleen_US
dc.description.departmentInstitute for Geophysicsen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1785/0120140159en_US
dc.contributor.utaustinauthorWalton, Maureen A. L.en_US
dc.contributor.utaustinauthorGulick, Sean P. S.en_US
dc.relation.ispartofserialBulletin of the Seismological Society of Americaen_US


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