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Title: Detecting co-seismic displacements in glaciated regions : an example from the great November 2002 Denali earthquake using SPOT horizontal offsets
Authors: Leprince, Sebastien
Avouac, Jean-Philippe
Sieh, Kerry
Taylor, Michael H.
Keywords: DRNTU::Science::Geology::Volcanoes and earthquakes
Issue Date: 2008
Source: 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.
Series/Report no.: Earth and planetary science letters
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.
ISSN: 0012821X
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: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EOS Journal Articles

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