The islands of Japan are primarily the result of several large ocean movements occurring over hundreds of millions of years from the mid-Silurian to the Pleistocene, as a result of the subduction of the Philippine Sea Plate beneath the continental Eurasian plate to the south, and subduction of the Pacific Plate under the North American Plate to the north. Japan was originally attached to the eastern coast of the Eurasian continent.
The islands of Japan are primarily the result of several large ocean movements occurring over hundreds of millions of years from the mid-Silurian to the Pleistocene, as a result of the subduction of the Philippine Sea Plate beneath the continental Eurasian plate to the south, and subduction of the Pacific Plate under the North American Plate to the north. Japan was originally attached to the eastern coast of the Eurasian continent.
Source: Wikipedia "Geology of Japan" · CC BY-SA 4.0
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