Abundant evidence indicates that such a new volcano exists at L'ihi, a seamount (or submarine peak) located about 20 miles off the south coast.
In 2011, a 9.0-magnitude earthquake -- one of the worst ever to hit Japan -- killed more than 20,000 people and caused tsunamis of up to 12 meters (40 feet) which swamped the Fukushima Daiichi nuclear power plant, triggering a nuclear meltdown. Fukushima resident: We live in fear.
A series of massive earthquakes have struck north-east Japan, unleashing a 10-metre tsunami that swept buildings, vehicles, crops and debris across swaths of farmland. The first 8.9 magnitude shock is said to be the biggest to have hit Japan in 140 years, rocking buildings 235 miles (380km) away in Tokyo and sparking fires.