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GPS-determination of along-strike variation in Cascadia margin kinematics: Implications for relative plate motion, subduction zone coupling, and permanent deformation

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dc.creator Miller, M. Meghan
dc.creator Johnson, Daniel J.
dc.creator Rubin, Charles M.
dc.creator Dragert, Herb
dc.creator Wang, Kelin
dc.creator Qamar, Anthony
dc.creator Goldfinger, Chris
dc.date.accessioned 2010-07-14T23:28:43Z
dc.date.available 2010-07-14T23:28:43Z
dc.date.issued 2001-04
dc.identifier.citation Miller, M., D. Johnson, C. Rubin, H. Dragert, K. Wang, A. Qamar, and C. Goldfinger (2001), GPS‐determination of along‐strike variation in Cascadia margin kinematics: Implications for relative plate motion, subduction zone coupling, and permanent deformation, Tectonics, 20(2), 161-176. en
dc.identifier.uri http://hdl.handle.net/1957/16705
dc.description Copyrighted by American Geophysical Union. en
dc.description.abstract High-precision GPS geodesy in the Pacific Northwest provides the first synoptic view of the along-strike variation in Cascadia margin kinematics. These results constrain interfering deformation fields in a region where typical earthquake recurrence intervals are one or more orders of magnitude longer than the decades-long history of seismic monitoring and where geologic studies are sparse. Interseismic strain accumulation contributes greatly to GPS station velocities along the coast. After correction for a simple elastic dislocation model, important residual motions remain, especially south of the international border. The magnitude of northward forearc motion increases southward from western Washington (3-7 mm/yr) to northern and central Oregon (~9 mm/yr), consistent with oblique convergence and geologic constraints on permanent deformation. The margin-parallel strain gradient, concentrated in western Washington across the populated Puget Lowlands, compares in magnitude to shortening across the Los Angeles Basin. Thus crustal faulting also contributes to seismic hazard. Farther south in southern Oregon, northwestward velocities reflect the influence of Pacific-North America motion and impingement of the Sierra Nevada block on the Pacific Northwest. In contrast to previous notions, some deformation related to the Eastern California shear zone crosses northernmost California in the vicinity of the Klamath Mountains and feeds out to the Gorda plate margin. en
dc.language.iso en_US en
dc.publisher American Geophysical Union en
dc.relation.ispartofseries Tectonics en
dc.relation.ispartofseries Vol. 20 (2001) en
dc.title GPS-determination of along-strike variation in Cascadia margin kinematics: Implications for relative plate motion, subduction zone coupling, and permanent deformation en
dc.type Article en
dc.identifier.doi 10.1029/2000TC001224


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