Geological base ment originated from submarine volcanoes
Products of ancient submarine volcanoes
The whole peninsula upheaved during the collision with Honshu, forming Izu as a result. For that reason, Izu Peninsula is a rare location where one can directly observe submarine volcanoes, which could have easily remained forever hidden on the bottom of the sea but now appear right before our eyes as a beautiful coastline, a dynamic geographical feature formed by lava.
And exactly because Izu is a perfect place for observation of cross sections of such submarine volcanoes, a great number of advanced scientific studies (including those conducted by researchers from abroad) on submarine volcanoes has been done especially on the Nishiizu and Minamiizu areas, making the peninsula one of the best locations in the world to study submarine volcanoes in the world.