Akahoya eruption

The Akahoya eruption was the strongest known volcanic eruption of the Kikai Caldera in Kyushu, Japan. It ejected about convert|150|km3|cumi|abbr=off|lk=on of volcanic material, giving it a 7 on the Volcanic Explosivity Index. The Akahoya eruption is one of only five known eruptions reaching that magnitude during the Holocene. It dramatically changed vegetation in Southern Kyushu. [cite journal |last=Sugiyama |first=Shinji |authorlink= |coauthors= |year=2002 |month= |title=The Impact of the Kikai-Akahoya Explosive Eruption on Vegetation in Southern Kyushu, Japan, Clarified by Phytolith Studies. |journal=Quaternary Research |volume=41 |issue=4 |pages=311–316 |issn=0418-2642 |url= |accessdate= |quote= ]

Archaeologically it has been dated around 7,300 cal. BP during the Earliest Jōmon period, [cite journal |last=Kuwahata |first=Mitsuhiro |authorlink= |coauthors= |year=2002 |month= |title=Age and Cultural Influence of the Kikai-Akahoya Eruption as Seen from Archaeological Material in South Kyushu, Japan |journal=Quaternary Research |volume=41 |issue=4 |pages=317–330 |issn=04182642 |url= |accessdate= |quote= ] but it has also been radiocarbon dated to 6,500 BP. [cite journal |last=Maeno |first=Fukashi |authorlink= |coauthors=Taniguchi, Hiromitsu |year=2005 |month= |title=Eruptive History of Satsuma Iwo-jima Island, Kikai Caldera, after a 6.5ka Caldera-forming Eruption |journal=Bulletin of the Volcanological Society of Japan |volume=50 |issue=2 |pages=71–85 |issn=0453-4360 |url= |accessdate= |quote= ]

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