International Union of Geodesy and Geophysics. The IUGG is a non-governmental, scientific organization established in 1919, dedicated to promoting and coordinating studies of the Earth and its environment in space. The IUGG Tsunami Commission, established in 1960, is an international group of scientists concerned with various aspects of tsunamis, including an improved understanding of the dynamics of generation, propagation, and coastal runup of tsunamis, as well as their consequences to society. (