Yahoo! News - Strong quake shakes buildings in Tokyo
Yahoo! News reports: "A strong earthquake of magnitude 5.8 hit central Japan on Saturday morning, according to the US Geological Survey. The quake, which shook buildings in Tokyo, struck at 11:19 am (0219 GMT), 83 kilometres (52 miles) north of the capital and at a depth of 20 kilometres, the USGS said."

Comment: Another aftershock. Actually, I'm not clear on when they are to be called aftershocks or new earthquakes? At any rate, yet another one hits Japan.