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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.
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A volcano that once existed in the northern part of Kagoshima Bay caused an eruption called the Great Aira Eruption about 25,000 years ago, forming the Aira Caldera. Aira City is located on the northwest side of this caldera, on the somma, and there is a stratum called Shirasu, which originated from pyroclastic flows that flowed out during a ...
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 ...
The Long Valley Caldera in California is about 10 miles wide. And one of the most famous calderas in the world, at Yellowstone National Park, measures 30 miles by 45 miles, according to the U.S ...
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 ...
The volcano also erupted in June about a mile south of Kilauea caldera, marking the first eruption in that region of the volcano in about 50 years. The last one took place in December 1974. The ...