Geological origin of landmass from submarine volcanoes
Products of ancient submarine volcanoes
The whole peninsula was uplifted upon its collision with Honshu, this eventually formed the present landscape of Izu. For this reason, Izu Peninsula is a rare location where one can directly observe remnants of submarine volcanoes, which could otherwise have been hidden beneath the waves. Today, these relics appear right before our eyes as a beautiful coastline, a dynamic geographical feature formed by once flowing lava.
And because Izu is a perfect place for observation of cross sections of submarine volcanoes, a great number of advanced scientific studies (including those conducted by researchers from abroad) has been done on the peninsula–especially on the Nishiizu and Minamiizu areas. This makes the peninsula one of the best locations in the world to study submarine volcanoes.
Dogashima Coast of Nishiizu-cho: cross lamina and volcanic ash accumulated on the ocean floor/a relic of submarine volcanic eruption and waves
Pillow lava of Issiki, Nishiizu-cho: marks of lava that flowed through the ocean floor