Scientists sire discovered a giant dome of lava beneath the Kikai Caldera supervolcano.
It is determined to contain more than 32 cubic km (7.68 cubic miles) of magma and researchers take it the supervolcano could explode again.
The volcano last erupted 7,300 years ago and scientists be enduring said the lava dome could kill up to 100 million people if it outs.
Currently the dome is around 6.2 miles (10 kilometres) roomy and formed after the last major eruption thousands of years ago when the volcano’s construct collapsed in on itself.
The immersed mountain is located near the Ōsumi Islands of Kagoshima Prefecture.
Researchers from the Kobe Ocean-Bottom Investigation Center (KOBEC) at Kobe University, confirmed the giant lava dome was fabricated after a caldera-forming supereruption 7,300 years ago.
The eruption is understood to be subjected to wiped out the Japanese Jomon civilisation.
Kobe researchers have denoted if the volcano erupts again, it could trigger a ‘volcanic winter’ as the jumbo amounts of debris could potentially block out the sun for some areas.
Japan Kikai volcano update: The inner and in default caldera rims are shown by solid lines
The eruption could call a tsunami which would hit southern Japan and the coasts of Taiwan and China, in the past striking the coasts of North and South America.
There is roughly a one percent time of the giant caldera eruption occurring within the next 100 years.
An expulsion like this would see over 40 cubic kilometres of magma released in one explode, causing enormous damage.
Kobe University researchers have captured out three survey voyages to the Kikai Caldera since 2015.
This supervolcano envisions the volcanic front (broken line) of active volcanoes (red circles) in Japan
In Parade, researchers plan to use seismic reflection and underwater robots to “clarify the set-up process of the two-layer caldera” and the mechanism that causes a “giant caldera emission.”
The paper from Kobe University said: “Supereruptions leading to the monumental caldera collapse are rare by extremely hazardous events, and also comprise severe global impacts such as ‘volcanic winter.’
“Many of these wonderful volcanoes repeat super eruptions in their multi-million year experiences. Although the volcanic activity is relatively quiet during the intervening days between super eruptions, the post-caldera activity should provide a key to apprehension the evolution of magma-plumbing system in the whole caldera cycle.”
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Japan Kikai volcano update: Diagrams tell a possible process of the Kikai lava dome formation
The lava dome is in a caldera – which is a cauldron-like recession that forms following the collapse of a volcano into itself, protocol a crater.
The dome rises to 600 metres (1,968.5 feet) exceeding the seabed and is now only 30.5 metres (10 feet) beneath the superficies.
The Smithsonian Institution said the volcano last experienced seismic project between January 2013 and July 2014, which included one vomiting up with intermittent explosions, occasional ash and steam plumes sporadic feckless seismic tremor.