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Actually, the North American Plate and the Pacific plate form a transform boundary. There is no volcanism related with a transform boundary. Mt. Saint Helens was created by the interactions of the North American plate and the Juan de Fuca plate. The Juan de Fuca plate is an oceanic plate, made of material which is more dense than continental plates, such as the North American plate. The Juan de Fuca plate and the North American plate are currently smashing into each other, and Juan de Fuca plate is subducting (sinking below) because it is denser. this allows for magma to come to the surface, and creates a volcano.

Please disregard the first answer as it is complete and utter jank.

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14y ago
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1mo ago

Mount St. Helens' eruption in 1980 was caused by the release of pressure from the subduction of the oceanic Juan de Fuca Plate under the North American Plate. The movement of the plates created immense pressure which led to the eruption.活動及其爆发。

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13y ago

The plates converged and the event happened

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12y ago

The North American Plate and the Juan de Fuca plate.

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Q: How did plate movement cause the eruption of mt st Helens?
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They cause plate movement. The plate movement then causes an earthquake.


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The eruption of Mount Tarawera in 1886 was associated with a type of plate movement known as rifting. This event was caused by the North Island of New Zealand moving over the boundary between the Australian Plate and the Pacific Plate.


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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 would cause a major earthquake in B.C.?

plate movement and plate tectonics


What two plates collided that caused mt st helen erupt?

The eruption of Mount St. Helens in 1980 was caused by the subduction of the Juan de Fuca Plate under the North American Plate. The Juan de Fuca Plate is moving eastward and diving beneath the North American Plate, creating intense pressure and leading to the volcano's eruption.


Why is Mount St Helens located there?

Mount St. Helens is located in Washington state because it forms part of the Cascade Range, a volcanic arc in the Pacific Northwest region of the United States. This volcanic arc is created by the subduction of the Juan de Fuca plate beneath the North American plate, leading to the formation of magma chambers and ultimately volcanic activity, such as the eruption of Mount St. Helens in 1980.


Did plate movemaent cause the eyjafjallajokull volcano to erupt?

Yes, the Eyjafjallajökull volcano in Iceland is located on the Mid-Atlantic Ridge, which is a divergent plate boundary. The movement of the tectonic plates in this region has contributed to the volcanic activity in Iceland, including the eruption of Eyjafjallajökull in 2010.


Is there any connection between mount saint helens earthquake and the loma prieta earthquake?

No, the Mount Saint Helens eruption in 1980 was caused by a volcanic event, while the Loma Prieta earthquake in 1989 was caused by movement along the San Andreas Fault. They were unrelated geologic events occurring in different regions with different geological processes.


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No, they don't. In fact earthquake are a result of transform plate movement.


What catastrophic event can result from movements of plates in the earths crust?

Earthquakes Tsunamis and ultimately on a longer time scale a volcanic eruption (destructive plate margin volcano such as mt st helens in the 1980s)