The National Oceanic and Atmospheric Administration released this video showing the spread of the tsunami generated by a magnitude 8.9 quake off Sendai, Japan, on March 11. The so-called MOST model created the propagation map based on sea-monitoring devices known as the Deep-Ocean Assessment and Reporting of Tsunami (DART) buoys.
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Philip Yam is the managing editor of ScientificAmerican.com, responsible for the overall news content online. He began working at the magazine in 1989, first as a copyeditor and then as a features editor specializing in physics. He is the author of The Pathological Protein: Mad Cow, Chronic Wasting and Other Prion Diseases.