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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 upper part of the Japanese islands was created at the edge of the Eurasian plate 180 million years ago. [citation needed] Then, 50 million years later, the lower part was created at the southern part of the Yangtze continent. The lower part then rode on the Izanagi plate and moved to the upper part. These islands were joined into one and ...
Indo-Australian plate – Major tectonic plate formed by the fusion of the Indian and Australian plates (sometimes considered to be two separate tectonic plates) – 58,900,000 km 2 (22,700,000 sq mi) Australian plate – Major tectonic plate separated from Indo-Australian plate about 3 million years ago – 47,000,000 km 2 (18,000,000 sq mi)
They are deeper than the Eurasian plate. The Philippine Sea Plate moves beneath the continental Amurian Plate and the Okinawa Plate to the south. The Pacific Plate moves under the Okhotsk Plate to the north. These subduction plates pulled Japan eastward and opened the Sea of Japan by back-arc spreading around 15 million years ago. [16]
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]
Eurasian plate Boso triple junction The Boso triple junction (also known as off-Boso triple junction ) is a triple junction off the coast of Japan; it is one of two known examples of a trench -trench-trench triple junction on the Earth (the other being the Banda Sea triple junction ).
The temblor, which measured 4.8 on the Richter scale, was considered a shallow earthquake by the U.S. Geological Survey, meaning that it occurred at a depth of zero to 70 kilometers below ground.
Plate tectonics (from Latin tectonicus, from Ancient Greek τεκτονικός (tektonikós) 'pertaining to building') is the scientific theory that Earth's lithosphere comprises a number of large tectonic plates, which have been slowly moving since 3–4 billion years ago.