Project REDEAM (Regional Deformation of the Earth Models): Models for Historical Horizontal Deformation

摘要

Models for historical horizontal crustal deformation have been derived for a total of 19 tectonically active regions, 16 of which combine to cover all of California, with one model each representing parts of Nevada, Alaska, and Hawaii. These data span the 1850-1980 interval; however, over 90 percent postdate 1930. The models were developed in support of the redefinition of the North American horizontal reference system. In particular, the models were used to update all appropriate geodetic observations to the values that would be obtained if the observations were remeasured on December 31, 1983. These updated observations were then used to estimate, for this date, the positional coordinates (latitude and longitude) of the geodetic marks that comprise the horizontal reference network.