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Earthquake data from http://earthquake.usgs.gov/research/data/centennial.php.
As per http://www.usgs.gov/laws/info_policies.html, this data is in the public domain.
Credit: U.S. Geological Survey
Department of the Interior/USGS
Earth texture from http://earthobservatory.nasa.gov/Features/BlueMarble/BlueMarble_monthlies.php
As per http://www.jsc.nasa.gov/policies.html#Guidelines, this data is in the public domain.
Data produced by NASA’s Earth Observatory
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