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John Vidale: Mexico's earthquake caused by crumpling from the downward bending of the sinking Cocos Plate deep within earth

He says cure for devastation: make buildings earthquake proof. Meantime Mexico's "earthquake early warning" appeared to do its job. US could use the same

Editor’s Note: John Vidale, a seismologist, is a professor of Earth Sciences at the University of Southern California and director of the Southern California Earthquake Center. Follow him on Twitter at @seismoguy. The opinions expressed in this commentary are solely those of the author.