Powerful M6.2 quake hits eastern Japan — Felt over span of 500 kilometers — 13 quakes near same spot in two hours (MAP)

Reuters, 2:48a ET: An earthquake with a preliminary magnitude of 6.2 jolted eastern Japan on Monday, the Japan Meteorological Agency said [...] Tokyo Electric Power Co said there were not reports of irregularities at its Fukushima Daiichi nuclear plant in northeastern Japan or at its other nuclear facilities. [...]

Source: jma.go.jp

ABC News (Australian Broadcasting Corporation): A powerful earthquake has shaken Tokyo, wobbling high-rise buildings in the capital for 30 seconds. [...] In the capital, high-rise buildings shook for more than half a minute. The shallow quake was felt over a 500-kilometre range of Japan’s main island of Honshu – from Akita in the north to Shizuoka in the south. [...]
Kyodo News: An earthquake with a preliminary magnitude of 6.2 jolted Tochigi Prefecture [100 miles WSW of Fukushima Daiichi] in eastern Japan and its vicinity on Monday, the Japan Meteorological Agency said. No tsunami warning was issued following the 4:23 p.m. quake, which registered upper 5 on the Japanese seismic intensity scale of 7. [...]