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The Cascade Mountains in Oregon and Washington (including Mount St. Helens) are created by the subduction of the Juan de Fuca plate under the North American Continental Plate.
See Wikipedia:
http://en.wikipedia.org/wiki/Juan_de_Fuca_Plate
http://en.wikipedia.org/wiki/Cascade_Volcanoes
Essentially all of the volcanoes in the Cascade Range are still considered active. Mt St. Helens is considered the most active with the large eruption in 1980, followed by numerous small "cone building" eruptions.
The Three Sisters have had major lava flows every few thousand years, and Mt. Mazama had a major eruption about 7,000 years ago followed by numerous small cone-building eruptions. They could all have future eruptions.
The following images are from the above Wikipedia Article, and were originally produced by the USGS and entered into the public domain.
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What plate tectonic is Mt St. Helens located on?
Mount St. Helens is located on the convergent boundary between the Juan de Fuca Plate and the North American Plate. The subduction of the Juan de Fuca Plate beneath the North American Plate is responsible for the volcanic activity in the region. This tectonic activity leads to the formation of stratovolcanoes like Mount St. Helens, which famously erupted in 1980.
What years did st helens erupt?
It erupted in the year of 1980.
What volcano erupted in 1970?
The volcano that erupted in 1970 was Mount St. Helens in Washington state, USA. The eruption occurred on May 18, 1980, resulting in the catastrophic eruption that caused significant damage and loss of life.
What year did Mount St. Helens erupt?
Mount St. Helens famously erupted on May 18, 1980. Smaller eruptions ocurred from 1980 to 1986, 1989 to 1991, and a few times from 2004 to 2008.
What type of plate boundary caused Mount St Helens?
Mount St. Helens is located along the Cascadia Subduction Zone, where the Juan de Fuca Plate is subducting beneath the North American Plate. This subduction zone is a convergent plate boundary, resulting in the volcanic activity that built the mountain and led to its catastrophic eruption in 1980.
What plate tectonic is Mt St. Helens located on?
Mount St. Helens is located on the convergent boundary between the Juan de Fuca Plate and the North American Plate. The subduction of the Juan de Fuca Plate beneath the North American Plate is responsible for the volcanic activity in the region. This tectonic activity leads to the formation of stratovolcanoes like Mount St. Helens, which famously erupted in 1980.
What happened in 1980?
Mt st helens erupted
What volcanoe erupted in the U.S in 1980?
Mount St. Helens
What US volcano erupted in 1980?
Mount St. Helens
What years did st helens erupt?
It erupted in the year of 1980.
What is the volcano that erupted in the state of Washington in 1980?
mount st Helens
What volcano erupted in 1970?
The volcano that erupted in 1970 was Mount St. Helens in Washington state, USA. The eruption occurred on May 18, 1980, resulting in the catastrophic eruption that caused significant damage and loss of life.
Which mountain erupted in 1980 in Washington United states?
Mt Helens
What year did Mount St. Helens erupt?
Mount St. Helens famously erupted on May 18, 1980. Smaller eruptions ocurred from 1980 to 1986, 1989 to 1991, and a few times from 2004 to 2008.
When was the first eruption of mt st helens?
Mt St Helens first erupted on May 18, 1980
What erupted in the us in the 1980s?
Mt. St. Helens erupted in the U.S. in 1980 killing over fifty people.
What type of plate boundary caused Mount St Helens?
Mount St. Helens is located along the Cascadia Subduction Zone, where the Juan de Fuca Plate is subducting beneath the North American Plate. This subduction zone is a convergent plate boundary, resulting in the volcanic activity that built the mountain and led to its catastrophic eruption in 1980.
