Akaigawa Caldera (赤井川カルデラ, ''Akaigawa karudera'') is a

caldera A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is ...

located in Hokkaido Prefecture,

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

. It was active anywhere between 1.7 and 1.3 million years ago. Akaigawa Caldera & Yoichigawa Caldera Relief Map, SRTM-1

References

Volcanoes of Hokkaido Calderas of Hokkaido Pleistocene calderas {{Volcano-stub

See also

References