UPDATE 2-Strong quake hits N. Japan, tsunami warning issued

Tsunami advisory up to 50 cm issued for northeastern Japan

* No impact on nuclear plants (Adds details, quote)

TOKYO, March 9 (Reuters) - A strong earthquake with a preliminary magnitude of 7.2 hit off the coast of northeastern Japan on Wednesday, the Japanese Meteorological Agency (JMA) said, but there were so far no reports of damage from the quake.

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