A warning for a tsunami as big as one metre (three feet)  forecast to hit islands in Japan's far south after a 6.6 magnitude earthquake struck off eastern Taiwan was cancelled on Monday. National broadcaster NHK said waves were possible on several islands in the southern Okinawa chain after a very shallow quake centred on Yonaguni in the southwest, near Taiwan. Witnesses said buildings swayed in Taipei but there was no visible damage in the Taiwan capital. General view of Ginowan city, north-east of the capital of Okinawa Prefecture in Japan ©Kazuhiro Nogi (AFP/File) 'We are issuing warnings via the radio,' Satoshi Shimoji of the Miyako City government told NHK. 'We want residents to get as far as possible from the sea,' he said. NHK said the tsunami -- an irregular wave that alters the sea level, and not necessarily a huge event -- were believed to have already arrived at remote Yonaguni, although no details were yet available. Live footage from coastal cameras showed sea levels had apparently not risen in several harbours within the warning zone. The Pacific Tsunami Warning Centre said in a statement that 'based on all the available data... there is no tsunami threat from this earthquake.' Map locating the epicenter of a 6.6-magnitude quake that hit the southwest edge of Japan's Okinawa province, near the coast of Taiwan on April 20, 2015 . The US Geological Survey said the 6.6 magnitude quake, which Japanese authorities had originally put at 6.8, struck 71 kilometres (44 miles) east of Hualian, Taiwan at 0143 GMT. Japan sits at the confluence of four of the earth's tectonic plates and registers more than 20 percent of the planet's most powerful earthquakes every year. Strict building codes and a long familiarity with the dangers mean that quakes that might cause devastation in other parts of the world are frequently uneventful in Japan. However, occasional disasters prove exceptionally deadly, and more than 18,000 people were killed by a huge tsunami that smashed into the northeast coast in 2011 after a huge 9.0 magnitude earthquake.
A tsunami warning for islands in Japan's far south has been cancelled.
A very shallow quake hit Yonaguni in the southwest, near Taiwan.
Witnesses said buildings swayed in Taipei but there was no visible damage.