A 5.1M earthquake has struck off the coast of Japan. The US Geological Survey (USGS) puts the epicentre approximately about 6 miles down at 4.614°S, 105.049°W. There are reports on Twitter from people in various parts of Japan who felt the quake. There’s no tsunami warning so far.
At that depth, a tsunami is considered unlikely, but there’s clearly a need to be vigilant. The area is part of the Pacific Ring of Fire, one of the most active earthquake regions on the planet.
It’s barely six months since Japan was last hit by a powerful earthquake, which did cause a massive tsunami that swept ashore and caused carnage. Since then, there has been growing interest in the subject of earthquakes, with people nervously asking on Twitter whether there is any chance of another tsunami.