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Deep structure beneath the Southern Rocky Mountains from the Rocky Mountain Front Broadband Seismic Experiment

¹ Lamont-Doherty Earth Observatory and Department of Earth and Environmental Sciences of Columbia University, Palisades, NY 10964, U.S.A.
² CIRES and Department of Geological Sciences, University of Colorado at Boulder, Boulder, CO 80309, U.S.A.
³ Department of Geological Sciences, University of Texas at Austin, Austin, TX 78712, U.S.A.
⁴ Department of Geological Sciences, University of Oregon, Eugene, OR 97403, U.S.A.
⁵ formerly at: Lamont-Doherty Earth Observatory and Department of Earth and Environmental Sciences of Columbia University, Palisades, NY 10964, U.S.A.
⁶ Polar Research Center, Korea Ocean Research and Development Institute, Seoul, South Korea
⁷ Institute of Geophysics, Victoria University, Wellington, New Zealand

The deployment of a two-dimensional array of broadband seismometers during the PASSCAL Rocky Mountain Front experiment produced a teleseismic and regional event data set which provides constraints on both the laterally averaged and laterally varying structure of the crust and upper mantle beneath the Southern Rocky Mountains and Great Plains. Results from a spectrum of seismological imaging and inversion techniques indicate that the western edge of the North American tectosphere has been relocated from its position beneath the Paleozoic passive margin to a position several hundred kilometers east of the Colorado Front Range. The mantle and crustal structure presently beneath the Colorado Rockies suggest a laterally variable dynamic state, which, on average, must provide partial support for the high topography.

Key Words: Seismology • structure of lithosphere and crust • Rocky Mountains

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