has prompted a tsunami warning of possible 3m (10ft) waves. The quake struck on Tuesday morning at about 06:00 local time (21:00 GMT, Monday), the Japan Meteorological Agency said. The depth of the quake was estimated to be around 11km (7 miles). In 2011, a large tsunami caused by a quake destroyed the Fukushima nuclear power plant. Broadcaster NHK said Tokyo Electric Power was checking the plant for damage.