& Ocean

The Izu Peninsula was originally a submarine volcano

14 million years ago

Around the same time that the Indian continent collided with the Eurasian continent and formed the Himalayas.

At the end of the ice age, the sea level rose due to warming temperatures, and the lowlands became the Sea of Japan.

It is said that the Japanese archipelago, which had been connected to the continent until then, was divided into a shape close to the present.

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2 million years ago

The origin of the current Izu Peninsula is on the Philippine Sea Plate,

It was a submarine volcano near the subduction zone under the Eurasian plate on which Honshu rides.

The submarine volcanoes were located hundreds of kilometers southeast of the current Izu Peninsula.

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1 million years ago

After that, the Philippine Sea Plate moved northwest and sank under the Eurasian Plate.

This brought the submarine volcanoes closer to Honshu.

At the same time, sand and mud accumulated on the submarine volcano, and eventually it came out of the sea surface and became a "volcano".

It is said that one million years ago , this volcanic belt collided with Honshu and became a land connection, and the Izu Peninsula began to form.

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600,000 years ago

Around this time, the Izu Peninsula, which has almost the same shape as it is today, is said to have been formed.

Volcanic activity became more active, and the mountains that still exist on the Izu Peninsula began to form.

Volcanic activity continued until it stopped 200,000 years ago.

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200,000 years ago

Volcanic activity has ceased, and it has become what it is today on the Izu Peninsula.

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