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dc.contributor.authorRegalla, Christineen_US
dc.contributor.authorFisher, Donald M.en_US
dc.contributor.authorKirby, Ericen_US
dc.contributor.authorOakley, Daviden_US
dc.contributor.authorTaylor, Stephanieen_US
dc.date.accessioned2018-02-08T02:53:07Z
dc.date.available2018-02-08T02:53:07Z
dc.date.issued2017-11-01
dc.identifierhttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000418334800016&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=6e74115fe3da270499c3d65c9b17d654
dc.identifier.citationRegalla, C., Fisher, D. M., Kirby, E., Oakley, D., & Taylor, S. (2017). Slip inversion along inner fore-arc faults, eastern Tohoku, Japan. Tectonics, 36, 2647–2668. https://doi.org/10.1002/ 2017TC00476 6
dc.identifier.issn0278-7407
dc.identifier.issn1944-9194
dc.identifier.urihttps://hdl.handle.net/2144/26908
dc.description.abstractThe kinematics of deformation in the overriding plate of convergent margins may vary across timescales ranging from a single seismic cycle to many millions of years. In Northeast Japan, a network of active faults has accommodated contraction across the arc since the Pliocene, but several faults located along the inner fore arc experienced extensional aftershocks following the 2011 Tohoku-oki earthquake, opposite that predicted from the geologic record. This observation suggests that fore-arc faults may be favorable for stress triggering and slip inversion, but the geometry and deformation history of these fault systems are poorly constrained. Here we document the Neogene kinematics and subsurface geometry of three prominent fore-arc faults in Tohoku, Japan. Geologic mapping and dating of growth strata provide evidence for a 5.6–2.2 Ma initiation of Plio-Quaternary contraction along the Oritsume, Noheji, and Futaba Faults and an earlier phase of Miocene extension from 25 to 15 Ma along the Oritsume and Futaba Faults associated with the opening of the Sea of Japan. Kinematic modeling indicates that these faults have listric geometries, with ramps that dip ~40–65°W and sole into subhorizontal detachments at 6–10 km depth. These fault systems can experience both normal and thrust sense slip if they are mechanically weak relative to the surrounding crust. We suggest that the inversion history of Northeast Japan primed the fore arc with a network of weak faults mechanically and geometrically favorable for slip inversion over geologic timescales and in response to secular variations in stress state associated with the megathrust seismic cycle.en_US
dc.description.sponsorshipFunding was provided by a grant from the National Science Foundation Tectonics Program grant EAR-0809939 to D.M.F. and E.K., Geologic Society of America Graduate Research Grants, and the P.D. Krynine Memorial Fund. The authors thank Gaku Kimura, Kyoko Tonegawa, Hiroko Watanabe, Jun Kameda, and Asuka Yamaguchi for scientific and logistical support, and Kristin Morell for comments on early versions of the manuscript. We also thank Yuzuru Yamamoto and Kohtaro Ujiie for their detailed reviews and suggestions for improvement to the manuscript. The authors acknowledge the use of the Move Software Suite granted by Midland Valley's Academic Software Initiative. Geologic, structural, stratigraphic, and chronologic data used herein are accessible in manuscript figures, and in the citations therein. Input geologic data for trishear kinematic modeling can be accessed in Table 1 and in the supporting information. (EAR-0809939 - National Science Foundation Tectonics Program grant; Geologic Society of America Graduate Research Grants; P.D. Krynine Memorial Fund)en_US
dc.format.extentp. 2647 - 2668en_US
dc.languageEnglish
dc.publisherAMER GEOPHYSICAL UNIONen_US
dc.relation.ispartofTECTONICS
dc.rights©2017. American Geophysical Union.en_US
dc.subjectScience & technologyen_US
dc.subjectPhysical sciencesen_US
dc.subjectGeochemistry & geophysicsen_US
dc.subjectForearcen_US
dc.subjectFault inversionen_US
dc.subjectTohokuen_US
dc.subjectJapanen_US
dc.subjectKinematicsen_US
dc.subject2010 Maule Earthquakeen_US
dc.subjectNorthern Fossa Magnaen_US
dc.subjectPacific coasten_US
dc.subjectOki Earthquakeen_US
dc.subjectSeamount subductionen_US
dc.subjectTectonicsen_US
dc.subjectGeologyen_US
dc.subjectGeophysicsen_US
dc.titleSlip inversion along inner fore-arc faults, eastern Tohoku, Japanen_US
dc.typeArticleen_US
dc.identifier.doi10.1002/2017TC004766
pubs.elements-sourceweb-of-scienceen_US
pubs.notesEmbargo: Not knownen_US
pubs.organisational-groupBoston Universityen_US
pubs.organisational-groupBoston University, College of Arts & Sciencesen_US
pubs.organisational-groupBoston University, College of Arts & Sciences, Department of Earth & Environmenten_US
pubs.publication-statusPublisheden_US
dc.date.online2017-11-04


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