7.4 quake rocks southern Mexico, shakes capital

7.4 quake rocks southern Mexico, shakes capital: "USGS says the earth ruptured 12.4 miles deep, double its initial estimate.

In Mexico City, a Los Angeles Times reporter writes that "there was an initial rocking, a pause and then a much stronger, sustained rocking motion that swayed buildings in many parts of the capital."

A BBC reporter estimated that the earth shook for about a minute, a virtual eternity to people experiencing a big quake. "

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