Huge Porites Boulder, Japan (image) Geological Society of America Caption This is a huge porites boulder (9 m in diameter) deposited by the A.D. 1771 tsunami at Ishigaki Island, Japan. See related article, by Kazuhisa Goto and colleagues, "Localized tsunamigenic earthquakes inferred from preferential distribution of coastal boulders on the Ryukyu Islands, Japan." Credit Kazuhisa Goto for Geology Usage Restrictions Credit to photographer & Geology journal. 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.