The content originally appeared on: CNN (CNN)A deadly 7.4-magnitude earthquake struck off the coast of Japan's Fukushima prefecture on Wednesday, injuring dozens of people. For some, the incident brought back painfulmemories of 2011, when an earthquake triggered a tsunami causing a nuclear meltdown at the Fukushima power plant, a disaster that's still being felt to this day. Though the earthquake struck a similar area, Wednesday's quake hasn't prompted a national emergency - for a number of reasons. Here's what you […]