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Detecting co-seismic displacements in glaciated regions : an example from the great November 2002 Denali earthquake using SPOT horizontal offsets

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Detecting co-seismic displacements in glaciated regions : an example from the great November 2002 Denali earthquake using SPOT horizontal offsets

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dc.contributor.author Taylor, Michael H.
dc.contributor.author Leprince, Sebastien
dc.contributor.author Avouac, Jean-Philippe
dc.contributor.author Sieh, Kerry
dc.date.accessioned 2012-09-28T03:00:20Z
dc.date.available 2012-09-28T03:00:20Z
dc.date.copyright 2008
dc.date.issued 2012-09-28
dc.identifier.citation Taylor, M. H., Leprince, S., Avouac, J. P., & Sieh, K. (2008). Detecting co-seismic displacements in glaciated regions: an example from the great November 2002 Denali earthquake using SPOT horizontal offsets. Earth and Planetary Science Letters, 270(3-4), 209-220.
dc.identifier.issn 0012821X
dc.identifier.uri http://hdl.handle.net/10220/8661
dc.description.abstract We use SPOT image pairs to determine horizontal offsets associated with the Mw 7.9 November 2002 Denali earthquake in the vicinity of Slate Creek, AK. Field measurements and aerial photographs are used to further characterize the geometry of the surface rupture. Aerial photographs show that shear localization occurs where the rupture trace is linear, and distributed off-fault deformation is common at fault bends and stepovers, or at geologic contacts between rock, glacial sediments, and ice. The displacement field is generated using a sub-pixel cross correlation technique between SPOT images taken before and after the earthquake. We identify the effects of glacier motion in order to isolate the tectonic displacements associated with the Denali earthquake. The resulting horizontal displacement field shows an along-strike variation in dextral shear, with a maximum of approximately 7.5 m in the east near 144° 52′W, which decreases to about 5 m to the west near 145° 45′W. If the November 2002 earthquake represents the long-term behavior of the Denali fault, it implies a westward decrease in the long-term dextral slip rate. A possible mechanism to accommodate the westward decreasing slip on the Denali fault is to transfer fault slip to adjacent easttrending contractional structures in the western region of the central Alaskan Range.
dc.language.iso en
dc.relation.ispartofseries Earth and planetary science letters
dc.rights © 2008 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Earth and Planetary Science Letters, Elsevier B.V. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.epsl.2008.03.028].
dc.subject DRNTU::Science::Geology::Volcanoes and earthquakes.
dc.title Detecting co-seismic displacements in glaciated regions : an example from the great November 2002 Denali earthquake using SPOT horizontal offsets
dc.type Journal Article
dc.identifier.doi http://dx.doi.org/10.1016/j.epsl.2008.03.028
dc.description.version Accepted version

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