Sakhalin island arc
Encyclopedia
Sakhalin island arc is an ancient volcanic arc
dating from the Early Miocene
. The arc was a result of the Okhotsk Plate
subducting beneath the Eurasian plate
in the convergence
zone. The arc runs from mainland Asia
through Sakhalin Island into central Hokkaido
and the collision zone around the Daisetsuzan Volcanic Group
, where the Kurile island arc and the Northeastern Japan Arc
meet.
Volcanic arc
A volcanic arc is a chain of volcanoes positioned in an arc shape as seen from above. Offshore volcanoes form islands, resulting in a volcanic island arc. Generally they result from the subduction of an oceanic tectonic plate under another tectonic plate, and often parallel an oceanic trench...
dating from the Early Miocene
Early Miocene
The Early Miocene is a sub-epoch of the Miocene Epoch made up of two stages: the Aquitanian and Burdigalian stages....
. The arc was a result of the Okhotsk Plate
Okhotsk Plate
The Okhotsk Plate is a tectonic plate covering the Sea of Okhotsk, the Kamchatka Peninsula, Sakhalin Island and Tōhoku and Hokkaidō in Japan. It was formerly considered a part of the North American Plate, but recent studies indicate that it is an independent plate, bounded on the north by the...
subducting beneath the Eurasian plate
Eurasian Plate
The Eurasian Plate is a tectonic plate which includes most of the continent of Eurasia , with the notable exceptions of the Indian subcontinent, the Arabian subcontinent, and the area east of the Chersky Range in East Siberia...
in the convergence
Convergent boundary
In plate tectonics, a convergent boundary, also known as a destructive plate boundary , is an actively deforming region where two tectonic plates or fragments of lithosphere move toward one another and collide...
zone. The arc runs from mainland Asia
Asia
Asia is the world's largest and most populous continent, located primarily in the eastern and northern hemispheres. It covers 8.7% of the Earth's total surface area and with approximately 3.879 billion people, it hosts 60% of the world's current human population...
through Sakhalin Island into central Hokkaido
Hokkaido
, formerly known as Ezo, Yezo, Yeso, or Yesso, is Japan's second largest island; it is also the largest and northernmost of Japan's 47 prefectural-level subdivisions. The Tsugaru Strait separates Hokkaido from Honshu, although the two islands are connected by the underwater railway Seikan Tunnel...
and the collision zone around the Daisetsuzan Volcanic Group
Daisetsuzan Volcanic Group
The is a volcanic group of peaks arranged around the wide caldera in Hokkaidō, Japan. In the Ainu language it is known as Nutapukaushipe or Nutaku Kamushupe. These peaks are the highest in Hokkaidō...
, where the Kurile island arc and the Northeastern Japan Arc
Northeastern Japan Arc
Northeastern Japan Arc also Northeastern Honshū Arc, is an island arc on the Pacific Ring of Fire. The arc runs north to south along the Tohoku region of Honshū, Japan. It is the result of the subduction of the Pacific Plate underneath the North American Plate at the Japan Trench...
meet.