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Aira caldera is located at Kyushu, the southernmost island of Japan. The supervolcano peaks at 1117 m. [6]The eruption forming the Aira Caldera, occurred approximately 30,000 years ago, and resulted in tephra and ignimbrite from a vast amount of magma affecting the nearby land.
A major three phase eruption of the Aira Caldera formed in the first phase the Osumi pumice fall, had a second phase Tsumaya pyroclastic flow and in the third Ito eruption phase produced the widely distributed Aira-Tn tephra that has been dated at 29,428 to 30,148 years calibrated before present.
An eruption cannot be ruled out completely, but the researchers found that a solid rock structure is actually covering the magma chamber at the Long Valley Caldera, which is likely preventing big ...
Known as a super eruption for its magnitude, the event emptied out enough volcanic material to produce the 30-by-40-mile-wide caldera. The National Park Service said the eruption covered an area ...
Though such enormous eruptions are extremely infrequent, both volcanoes have remained active with much smaller eruptions in historic times, with Sakurajima in the bay and the Kirishima Mountains north of the bay forming active vents associated with the Aira volcano magma sources, and the smaller 4000-year-old Ikeda Caldera with Mount Kaimon at ...
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A map of Sakurajima in 1902, showing it as a distinct island. Sakurajima is in the 25 km (15 mi)-wide Aira caldera, which formed in an enormous "blow-out-and-cave-in" eruption around 22,000 years ago. [9] Several hundred cubic kilometres of ash and pumice were ejected, causing the magma chamber underneath the erupting vents to collapse. The ...