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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 ...
The Japan Median Tectonic Line is visible in forms of several outcrops and fault saddles in Ina city, Ōshika village, and Iida city in southern Nagano Prefecture. [9] 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 ...
Map showing Earth's principal tectonic plates and their boundaries in detail. These plates comprise the bulk of the continents and the Pacific Ocean.For purposes of this list, a major plate is any plate with an area greater than 20 million km 2 (7.7 million sq mi)
A map depicting the Japan Trench and its surrounding connections to other relevant trenches. The map was created using GeoMapApp. Topographic map of central Japan, showing location of trenches, tectonic plates and boundaries. The Japan Trench is an oceanic trench part of the Pacific Ring of Fire off northeast Japan.
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 islands of Japan were created by tectonic plate movements: Tohoku (upper half of Honshu), Hokkaido, the Kuril Islands, and Sakhalin are located on the Okhotsk Plate. This is a minor tectonic plate bounded to the north by the North American Plate.
In the 1980s, the boundary of the North American plate was extended to the Japan Sea and the Itoigawa-Shizuoka Tectonic Line (I-STL) due to earthquakes occurring at the eastern edge of the Japan Sea. 1990s research supported a proposal of an Okhotsk microplate independent from the North American plate. [4] [3]
Obduction zones occurs when the continental plate is pushed under the oceanic plate, but this is unusual as the relative densities of the tectonic plates favours subduction of the oceanic plate. This causes the oceanic plate to buckle and usually results in a new mid-ocean ridge forming and turning the obduction into subduction. [citation needed]