"Sumiyoshi-ike and Yonemaru are two basaltic maars formed in coastal lowland deposits north of the Aira caldera. The eruptions occurred during a period of rising sea level at the beginning of the Holocene. The 500-m-wide Sumiyoshi-ike maar was created about 7000 years ago. The larger, 1.2-km-wide Yonemaru maar erupted about 2 km west of Sumiyoshi-ike about 6500 years ago and produced pyroclastic surges that traveled 4 km from the vent."  -Smithsonian Volcano Archive
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