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Kinematic behavior of southern Alaska constrained by westward decreasing postglacial slip rates on the Denali Fault, Alaska

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Kinematic behavior of southern Alaska constrained by westward decreasing postglacial slip rates on the Denali Fault, Alaska

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dc.contributor.author Mériaux, Anne-Sophie
dc.contributor.author Sieh, Kerry
dc.contributor.author Finkel, Robert C.
dc.contributor.author Rubin, Charles M.
dc.contributor.author Taylor, M. H.
dc.contributor.author Meltzner, Aron J.
dc.contributor.author Ryerson, Frederick J.
dc.date.accessioned 2012-09-07T04:22:47Z
dc.date.available 2012-09-07T04:22:47Z
dc.date.copyright 2009
dc.date.issued 2012-09-07
dc.identifier.citation Mériaux, A.-S., Sieh, K., Finkel, R. C., Rubin, C. M., Taylor, M. H., Meltzner, A. J., & Ryerson, F. J. (2009). Kinematic behavior of southern Alaska constrained by westward decreasing postglacial slip rates on the Denali Fault, Alaska. Journal of geophysical research, 114(B03404).
dc.identifier.issn 0148–0227
dc.identifier.uri http://hdl.handle.net/10220/8482
dc.description.abstract Long-term slip rates for the Denali Fault in southern Alaska are derived using 10Be cosmogenic radionuclide (CRN) dating of offset glacial moraines at two sites. Correction of 10Be CRN model ages for the effect of snow shielding uses historical, regional snow cover data scaled to the site altitudes. To integrate the time variation of snow cover, we included the relative changes in effective wetness over the last 11 ka, derived from lake-level records and δ 18O variations from Alaskan lakes. The moraine CRN model ages are normally distributed around an average of 12.1 ± 1.0 ka (n = 22, ± 1σ). The slip rate decreases westward from ∼13 mm/a at 144°49′W to about 7 mm/a at 149°26′W. The data are consistent with a kinematic model in which southern Alaska translates northwestward at a rate of ∼14 mm/a relative to a stable northern Alaska with no rotation. This suggests progressive slip partitioning between the Denali Fault and the active fold and thrust belt at the northern front of the Alaska range, with convergence rates increasing westward from ∼4 mm/a to 11 mm/a between ∼149°W and 145°W. As the two moraines sampled for this study were emplaced synchronously, our suggestion of a westward decrease in the slip rate of the Denali Fault relies largely upon the measured offsets at both sites, regardless of any potential systematic uncertainty in the CRN model ages.
dc.format.extent 19 p.
dc.language.iso en
dc.relation.ispartofseries Journal of geophysical research
dc.rights © 2009 American Geophysical Union. This paper was published in Journal of Geophysical Research and is made available as an electronic reprint (preprint) with permission of American Geophysical Union. The paper can be found at the following official URL: http://dx.doi.org/10.1029/2007JB005053. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
dc.subject DRNTU::Science::Geology::Volcanoes and earthquakes.
dc.title Kinematic behavior of southern Alaska constrained by westward decreasing postglacial slip rates on the Denali Fault, Alaska
dc.type Journal Article
dc.identifier.doi http://dx.doi.org/10.1029/2007JB005053
dc.description.version Published version

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