Tonga Earthquake Revealed as Triple-Quake (IMAGE) U.S. National Science Foundation Caption The Sept. 29, 2009, quake in Samoa, American Samoa and Tonga was in fact a triple-quake. Credit Keith Koper, University of Utah Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.