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Plate boundaries are from the PLATES Project digital data compilation.
Plate motions calculated using DeMets et al. 1994 (Geophysical Research Letters, vol. 21, pp. 2191-2194). Topography is from Smith and Sandwell 1997 (Science, vol. 277, pp. 1956-1962) plotted using GMT mapping software (Wessel and Smith, 1991, EOS, Transactions AGU, vol. 72, pp. 441, 445-444).
Map produced at the University of Texas Institute for Geophysics, 1999.