<p>The quake occurred in the East China Sea, 218 kilometres (136 miles) west of Naha, Okinawa prefecture, the US Geological Survey said. The quake's depth was 222 kilometres (138 miles).<br /><br />There were no immediate reports of injuries or damage from the quake, which happened at 11:59 am (0259 GMT).<br /><br />Japan, located at the junction of four tectonic plates, experiences 20 per cent of the strongest quakes recorded on Earth each year.<br /><br />A devastating tsunami on March 11 left about 22,000 people dead or missing and triggered an atomic crisis at the Fukushima Daiichi nuclear plant in the northeast of the country.</p>
<p>The quake occurred in the East China Sea, 218 kilometres (136 miles) west of Naha, Okinawa prefecture, the US Geological Survey said. The quake's depth was 222 kilometres (138 miles).<br /><br />There were no immediate reports of injuries or damage from the quake, which happened at 11:59 am (0259 GMT).<br /><br />Japan, located at the junction of four tectonic plates, experiences 20 per cent of the strongest quakes recorded on Earth each year.<br /><br />A devastating tsunami on March 11 left about 22,000 people dead or missing and triggered an atomic crisis at the Fukushima Daiichi nuclear plant in the northeast of the country.</p>