Global Volcanism Program | Image GVP-10578
The 500-m-wide Sumiyoshiike maar formed about 7,000 years ago. Sumiyoshiike and Yonemaru are two maars that formed in coastal lowland deposits N of the Aira caldera during a period of rising sea level at the beginning of the Holocene. The larger 1.2-km-wide Yonemaru maar erupted about 2 km W of Sumiyoshiike about 6,500 years ago.
Copyrighted photo by Yoshihisa Kawanabe (Japanese Quaternary Volcanoes database, RIODB, http://riodb02.ibase.aist.go.jp/strata/VOL_JP/EN/index.htm and Geol Surv Japan, AIST, http://www.gsj.jp/).
Copyrighted image used with permission. All Rights Reserved. Contact photographer for any usage requests.