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: Active volcanoes Global map of subduction zones, with subducted slabs contoured by depth Diagram of the geological process of subduction. The Ring of Fire (also known as the Pacific Ring of Fire, the Rim of Fire, the Girdle of Fire or the Circum-Pacific belt) [note 1] is a tectonic belt of volcanoes and earthquakes.
The Cascade volcanoes define the Pacific Northwest section of the Ring of Fire, an array of volcanoes that rim the Pacific Ocean. The Ring of Fire is also known for its frequent earthquakes. The volcanoes and earthquakes arise from a common source: subduction. [2]
The Cascade Volcanoes are part of the Pacific Ring of Fire, the ring of volcanoes and associated mountains around the Pacific Ocean. The Cascade Volcanoes have erupted several times in recorded history. Two most recent were Lassen Peak in 1914 to 1921 and a major eruption of Mount St. Helens in 1980.
Reports of earthquakes and volcano eruptions along the Ring of Fire might lead some to believe that the level of activity in recent months is above average.
For example, the island arc associated with the Aleutian Trench is represented by the long chain of volcanoes that make up the Aleutian Islands. (SVG version of File:Pacific_Ring_of_Fire.png, recreated by Gringer using WDB vector data using code mentioned in File:Worldmap_wdb_combined.svg.)
The Aleutian Trench, formed by the subduction of the Pacific plate under the North American plate, sits south of the island arc. [2] A forearc basin reaching depths of 7 km occupies the space between the trench and the island arc and leads up to the Aleutian Ridge, the north side of which being the area where the most volcanic activity occurs. [2]
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Japan sits along the “Ring of Fire,” an arc of volcanoes and fault lines in the Pacific Basin. The country has about 1,500 earthquakes each year strong enough to be felt by people.