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Around 23 million years ago, western Japan was a coastal region of the Eurasia continent. The subducting plates, being deeper than the Eurasian plate, pulled parts of Japan which become modern Chūgoku region and Kyushu eastward, opening the Sea of Japan (simultaneously with the Sea of Okhotsk) around 15-20 million years ago, with likely freshwater lake state before the sea has rushed in. [4 ...
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The Geological Survey of Japan (地質調査総合センター, Chishitsu chōsa sōkō sentā) (GSJ) is a research institute and department of the National Institute of Advanced Industrial Science and Technology (AIST), an Independent Administrative Institution under the Ministry of Economy, Trade and Industry (METI).
The Japanese islands are formed of the mentioned geological units parallel to the subduction front. The parts of islands facing the Pacific Plate are typically younger and display a larger proportion of volcanic products, while island parts facing the Sea of Japan are mostly heavily faulted and folded sedimentary deposits.
Topographical map of the Sea of Japan. The Sea of Japan represents a back-arc basin that formed via geological rifting of continental crust from the late Oligocene to middle Miocene (28–13 million years ago). [3] The Sea of Japan can be divided into sub-basins; the Japan Basin, Yamato Basin and Tsushima Basin.
The Geological Museum (地質標本館, Chishitsu Hyōhon-kan) of the Geological Survey of Japan opened in Tsukuba, Ibaraki Prefecture, Japan in 1980.The collection totals some 150,000 rock, mineral, and fossil specimens, amassed during the activities of the Survey since its establishment in 1882, of which around 2,000 are on display at any one time.
The historic Akiha Kodo pilgrimage route (Japan National Route 152) between Suwa-taisha shrine in central Nagano Prefecture and the Akihasan shrine in Shizuoka Prefecture follows the Japan Median Tectonic Line. The Japan Median Tectonic Line Museum in Ōshika is dedicated to the history of and research on the tectonic line. [10]
Mount Yōtei (羊蹄山, Yōtei-zan, literally "sheep-hoof mountain") is an active [2] [3] stratovolcano located in Shikotsu-Toya National Park, Hokkaidō, Japan.It is also called Yezo Fuji or Ezo Fuji (蝦夷富士), "Ezo" being an old name for the island of Hokkaido, because it resembles Mount Fuji.