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Detailed Reference Information |
Cross, R.S. and Freymueller, J.T. (2007). Plate coupling variation and block translation in the Andreanof segment of the Aleutian arc determined by subduction zone modeling using GPS data. Geophysical Research Letters 34: doi: 10.1029/2006GL028970. issn: 0094-8276. |
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We use GPS measurements in the first geodetic study of plate coupling on the Andreanof segment, Aleutian subduction zone. Convergence of 7.3 cm/yr at the subduction zone results in northwestward displacements greater than 1 cm/yr at stations located on the west end of the Andreanof region, but velocities at the east end are smaller in magnitude and oriented west-southwest. These velocity variations are caused by differences in plate coupling along the subduction zone, which correlate with the rupture zones of the 1986 and 1996 Mw8 earthquakes. We construct a dislocation model to estimate the velocity of the arc in the Andreanof region relative to North America, and fault plane coupling coefficients. Our best model shows a southwestward velocity of 7.8 mm/yr, a high degree of coupling in the main thrust zone at the west end of the subduction zone, and little to no coupling at the east end. |
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Abstract |
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Keywords
Geodesy and Gravity, Tectonic deformation, Seismology, Subduction zones (1207, 1219, 1240), Tectonophysics, Continental margins, convergent, Tectonophysics, Dynamics, seismotectonics, Tectonophysics, Plate motions, present and recent |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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