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The May 18, 1980 eruption of Mt. St. Helens was a Plinian style eruption with a volcanic cloud that exceeded 60,000 ft in height. The eruption was classified as a V.E.I. 5 from the United States Geological Survey. For further details on the style and proceeding events to the eruption please see Related Links Section.
Wiki User
∙ 9y ago
Wiki User
∙ 12y agothis is how it erupt it was time that itv erupts os it took it about 12,00o years for it ti erupt and because it was cooled down for about 12,00 years and because magma has not be in it and for immediate action it about ot explode when for many reason it was a nature subtance so it erupt
Wiki User
∙ 11y agoThe May 1980 eruption of Mt. St. Helens was specifically so explosive due to the amount of dissolved gasses that were present in the magma chamber. The volcano has an extensive history of explosive eruptions, and when fresh magma from depth enters the magma chamber, the magma mixing cycle will often times result in a very explosive eruption of the mountain.
Magma mixing will cause the issue within this volcano due to the fact that hotter magma from depth entering the magma chamber below Mt. St. Helens activates and triggers the gasses that have been dissolved in the cooler magma that has been there since the previous eruption to build pressures further than otherwise would happen. This will lead to often times a very explosive eruption due to the explosive discharge of the gasses.
Another issue with the eruption of 1980 was that it also accompanied a very large failure of the north flank of the volcano. This failure caused the north flank to slide down the mountain triggering the eruption within a very short time, as the pressure that had been holding the magma in place from above was now gone. This also caused what is known as a lateral blast effect, since gasses and fluids when under pressure will follow the path of least resistance on its way to the surface. In this case with the flank collapse to the north, the path of least resistance was through what was left of the north flank directing the explosive eruption due north from the volcano. This resulted in the blow down area that was so very well documented right after the eruption ended.
Wiki User
∙ 13y agoMay 18th, 1980.
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What is mount st helens most recent eruption?
2008
Where was the most powerful avalanche?
The Mount St. Helens volcano was the strongest volcano
Did Mount St Helens erupt horizontally?
Yes. The 1980 eruption of Mount St. Helens started with a sideways explosion called a lateral blast, which was followed by a more normal vertical eruption column. While the lateral blast was the shortest phase of the eruption, it caused the most damage.
How many people died in the 1980 Mt St Helens volcano?
Mount St. Helens is most notorious for its major 1980 eruption, the deadliest and most economically destructive volcanic event in the history of the United States. Fifty-seven people were killed.
What was unusual about the eruption of Mount st helens?
Most major explosive eruptions eject a large plume of ash straight up. When Mount St. Helens erupted in 1980, the initial explosion was ejected sideways in what is called a lateral blast.
What was mt st Helens most famous eruption?
The 1980 eruption of Mount St. Helens.
What is mount st helens most recent eruption?
2008
Where was the most powerful avalanche?
The Mount St. Helens volcano was the strongest volcano
Did Mount St Helens erupt horizontally?
Yes. The 1980 eruption of Mount St. Helens started with a sideways explosion called a lateral blast, which was followed by a more normal vertical eruption column. While the lateral blast was the shortest phase of the eruption, it caused the most damage.
What was Mt St Helens most destructive eruption?
The deadly May 18, 1980 eruption of Mount St. Helens took the lives of 57 people and leveled hundreds of square miles of forests.
What was mount Pinatubo most famous eruption?
Mount Pinatubo produced a massive eruption on June 15, 1991 after a series of smaller eruptions. The eruption was approximately 20 times larger than the 1980 eruption of Mount St Helens and killed nearly 900 people.
How many people died in the 1980 Mt St Helens volcano?
Mount St. Helens is most notorious for its major 1980 eruption, the deadliest and most economically destructive volcanic event in the history of the United States. Fifty-seven people were killed.
What intensity is mount st Helens?
If the question is referring to the explosive intensity of Mt. St. Helens, it would depend on the eruption that you are referring to. In regards to the most well known eruption in historical times (May 18, 1980) it is registered by the United States Geological Service as a Volcano Explosivity Index 5 (VEI 5). Which is a very powerful eruption compared to how often they occur.
When did mount helens erupt?
It is said to have erupted many times, but the most famous eruption was on May 18, 1980, which took out most of the forest around it.
What was the most violent eruption?
I believe it was Yellowstone. If I remember correctly, The eruption was around 2500 times larger than the mount st. Helens eruption a few years ago. We are around 46,000 years over due for an eruption.
What was unusual about the eruption of Mount st helens?
Most major explosive eruptions eject a large plume of ash straight up. When Mount St. Helens erupted in 1980, the initial explosion was ejected sideways in what is called a lateral blast.
Is mount st helens in the top five most dangerous volcano?
mount st. helens is the top 4th most dangerous
