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 collapsed road after an earthquake in Minami-Aso, Kumamoto prefecture. A powerful 7.0-magnitude earthquake hit southern Japan early April 16, the U.S. Geological Survey said, a day after another powerful tremor killed at least nine people in the same area. AFP/Getty Images.