A strong 6.9 magnitude earthquake hit northeastern Japan early today, the country's meteorological agency said, issuing a tsunami warning for the region's coast including Fukushima prefecture. The agency said, a three metre tsunami could hit the northeastern coast, including Fukushima, home to the Fukushima Daiichi nuclear power plant, site of one of the world's worst nuclear disasters.<br/><br/>The US Geological Agency said, the quake, at a shallow depth of 11.3 kilometres, struck shortly before 6:00 am local time in the Pacific off Fukushima. The nation's meteorological agency had earlier estimated the quake's magnitude at 7.3. Japan sits at the junction of four tectonic plates and experiences a number of relatively violent quakes every year.