The islands eventually collided with Japan about 600,000 years ago, resulting in the Izu Peninsula. The islands got scraped off the top of the Philippine Plate as it submerged under the Eurasian Plate.
Pretty wild stuff, isn’t it? Izu peninsula is one of the few places on earth where this geological process has occurred.
The places where plates collide are called convergent boundaries, and there is a lot of volcanic and seismic activity. Izu is one of Japan’s most active regions, resulting in its many hot springs.