U.S. Scientists Predict Next Mega Quake — Bigger Than They Think??

U.S. scientists predict that the next mega quake may be bigger than they think. They are studying the information they got from the Fukushima quake that devastated much of Japan. They believe that the next quake could strike the west coast of the U.S.. The rumblings at Fukushima came from the deepest parts of the subduction zone and not the shallow parts as was believed. Is the west coast of the U.S. due for a mega quake?