ASU geology professor breaks down massive Japan earthquake

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PHOENIX -- The magnitude 8.9 earthquake that rocked Japan early Friday morning happened in an area known as the Pacific Ring of Fire. There are a large number of earthquakes, many of which are never felt, and volcanic eruptions in the basin of the Pacific Ocean in the area, which is shaped like a horseshoe and covers some 25,000 miles.

April Warnecke talked to Ramon Arrowsmith, a geology professor at Arizona State University, about this morning's temblor, which triggered a tsunami that hit Hawaii and was expected to sweep the west coast of the U.S. and Canada.