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The following individuals are interviewed about the 9.0 magnitude earthquake that struck Japan on March 11: eyewitnesses Jonathan Hammill and Andy Clark, Japan's ambassador to the U.S. Ichiro Fujisaki, Kyung Lah (CNN Tokyo correspondent - by telephone), Ken Hudnut (geophysicist with the U.S . Geological Survey), Eddie Bernard (Director of Marine Environmental Laboratory and the National Oceanic and Atmospheric Administration), Nate Berkus (survivor of the 2004 tsunami in Thailand), Neil deGrasse Tyson (astrophysicist), Richard Lester (Head of the Department of Nuclear Science and Engineering at MIT), Matthew Wald (The New York Times' nuclear expert), Antonio Villaraigosa (Mayor of Los Angeles), Rob Marciano (CNN Meteorologist) and Sam Champion (ABC Weather Anchor).