Files by the EarthByte Group (visualisation by NGU) is licensed under a Creative Commons Attribution 3.0 Unported License. For attribution, use the following citation:

Muller, R.D., Sdrolias, M., Gaina, C., Steinberger, B. and Heine, C., 2008, Science, 319, 1357--1362, doi:10.1126/science.1151540