%0 Journal Article %J Journal of Geophysical Research: Solid Earth %D 2013 %T Active tectonics of the St. Elias orogen, Alaska, observed with GPS measurements %A Elliott, Julie %A Jeffrey T. Freymueller %A Chris F. Larsen %K Alaska %K geodesy %K St. Elias orogen %K tectonics %K Yakutat block %X We use data from campaign and continuous GPS sites in southeast and south central Alaska to constrain a regional tectonic block model for the St. Elias orogen. Active tectonic deformation in the orogen is dominated by the effects of the collision of the Yakutat block with southern Alaska. Our results indicate that  37 mm/yr of convergence is accommodated along a relatively narrow belt of N-NW dipping thrust faults in the eastern half of the orogen, with the present-day deformation front running through Icy Bay and beneath the Malaspina Glacier. Near the Bering Glacier, the collisional thrust fault regime transitions into a broad, northwest dipping décollement as the Yakutat block basement begins to subduct beneath the counterclockwise rotating Elias block. The location of this transition aligns with the Gulf of Alaska shear zone, implying that the Pacific plate is fragmenting in response to the Yakutat collision. Our model indicates that the Bering Glacier region is undergoing internal deformation and could correspond to the final stage of offscraping and accretion of sediments from the Yakutat block prior to subduction. Predicted block motions at the western edge of the orogen suggest that the crust is laterally escaping along the Aleutian fore arc. %B Journal of Geophysical Research: Solid Earth %P n/a–n/a %G eng %U http://dx.doi.org/10.1002/jgrb.50341 %R 10.1002/jgrb.50341 %0 Journal Article %J Journal of Geophysical Research %D 2012 %T Gravity and uplift rates observed in southeast Alaska and their comparison with GIA model predictions %A Tatsuru Sato %A Miura, S. %A Sun, W. %A Sugano, T. %A Jeffrey T. Freymueller %A Chris F. Larsen %A Ohta, Y. %A Fujimoto, H. %A Inazu, D. %A Roman J. Motyka %B Journal of Geophysical Research %V 117 %P B01401 %G eng %0 Journal Article %J Tectonophysics %D 2011 %T Reevaluation of the viscoelastic and elastic responses to the past and present-day ice changes in Southeast Alaska %A Tatsuru Sato %A Chris F. Larsen %A Miura, S. %A Ohta, Y. %A Fujimoto, H. %A Sun, W. %A Roman J. Motyka %A Jeffrey T. Freymueller %B Tectonophysics %V 511 %P 79–88 %G eng %R 10.1016/j.tecto.2010.05.009 %0 Journal Article %J Journal of Geophysical Research %D 2010 %T Gravity measurements in southeastern Alaska reveal negative gravity rate of change caused by glacial isostatic adjustment %A Sun, W. %A Miura, S. %A Tatsuru Sato %A Sugano, T. %A Jeffrey T. Freymueller %A Kaufman, M. %A Chris F. Larsen %A Cross, R. %A Inazu, D. %B Journal of Geophysical Research %V 115 %P B12406 %G eng %R 10.1029/2009JB007194 %0 Journal Article %J Journal of Geophysical Research %D 2010 %T Tectonic block motion and glacial isostatic adjustment in southeast Alaska and adjacent Canada constrained by GPS measurements %A Elliott, J.L. %A Chris F. Larsen %A Jeffrey T. Freymueller %A Roman J. Motyka %B Journal of Geophysical Research %V 115 %P B09407 %G eng %R 10.1029/2009JB007139 %0 Journal Article %J Journal of Geodynamics %D 2008 %T Earth tides observed by gravity and GPS in southeastern Alaska %A Tatsuru Sato %A Miura, S. %A Ohta, Y. %A Fujimoto, H. %A Sun, W. %A Chris F. Larsen %A Heavner, M. %A Kaufman, AM %A Jeffrey T. Freymueller %B Journal of Geodynamics %V 46 %P 78–89 %G eng %0 Journal Article %J Alaska Park Science %D 2007 %T Post Little Ice Age Glacial Rebound in Glacier Bay National Park and Surrounding Areas %A Roman J. Motyka %A Chris F. Larsen %A Jeffrey T. Freymueller %A Echelmeyer, K.A. %B Alaska Park Science %V 6 %P 36–41 %G eng