SENDAI, Japan – Huge earthquakes rocked northeastern Japan on Saturday, a day after a giant temblor set off a powerful tsunami that killed hundreds of people, turned the coast into a swampy wasteland and left two nuclear reactors dangerously close to meltdown. The United States Geological Survey said a strong earthquake struck just before noon in the sea in virtually the same place where the magnitude 8.9 quake on Friday unleashed one of the greatest disasters Japan has witnessed — a 23-foot (7-meter) tsunami that washed far inland over fields and smashed towns. Saturday's magnitude 6.8 quake was followed by a series of temblors originating from the same area, the USGS said. It was not immediately known whether the new quakes caused any more damage. All were part of the more than 125 aftershocks since Friday's massive quake, the strongest to hit Japan since officials began keeping records in the late 1800s. It ranked as the fifth-largest earthqu...