Super Volcanoes

Old Faithful
Old Faithful

The Danger Lurking in Yellowstone

Each year over 330,000 visitors flock to Yellowstone National Park to see it's main attraction, Old Faithful. About every ninety minutes Old Faithful erupts shooting thousands of gallons of water into the air. If these visitors knew what forces where at work to create these eruptions they may no longer look at them with wonder. Instead of wonder they might look with fear.

Yellowstone Park is actually a Supervolcano. Old Faithful's eruptions are caused by super heated water which lies over a large pool of superheated magma miles beneath the parks surface.

Side view of Yellowstone's magma chamber
Side view of Yellowstone's magma chamber

How Supervolcanoes Are Formed

Normally a volcano is formed when a column of molten rock, known as magma, rises from deep within the Earth, erupts on the surface, and hardens in layers forming the familiar cone shaped mountain we typically associate with volcanoes.

Supervolcanoes are different. These begin when large reservoirs of magma collect deep in the Earth's crust. Magma continues to collect as the reservoir grows to an enourmous size under extreme pressure.A super eruption occurs when the pressurized magma raises overlying crust enough to create vertical fractures that extend to the planet's surface. One by one, magma begins to surge vertically along these new cracks, which forms a ring of erupting vents. Eventually, as the vents merge with each other, the large cylinder of land within the ring has nothing to support it. The remaining earth above the chamber crashes down into the magma below. This collapsing crust forces additional lava and gasses out around the edges of the ring further increasing the violence of the eruption that is now hundreds of times larger than a regular eruption. When the eruption ends it will leave behind a caldera, or large crater, just like the one that forms Yosemite National Park. 



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An erupting supervolcano
An erupting supervolcano

Dangers of Supervolcanoes

The last time their was a full-scale eruption of a supervolcano, the Lava Creek eruption, 240 cubic miles of dust and rock was propelled into the atmosphere. The human race was almost driven to extinction over 600,000 years ago.

If Yellowstone was to erupt today the results would be devastating. For people within hundreds of miles of the park death will be immediate. Those closest from the lava flows, those further out suffocated by volcanic ash. All of the United States would be covered in several inches of ash and the world would be in a volcanic winter for several years. Experts predict that 90% of the Earth's population would not make it.

The chance of a supervolcano erupting in a person's lifetime are very slim. On average, they occur about every 600,000 years. But if you remember that the last one happened about that long ago it makes you wonder if we are due for another.

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Comments 6 comments

Kebennett1 profile image

Kebennett1 7 years ago from San Bernardino County, California

Very well put together! Good information! I have never been there myself but I would like to someday!


?????????????????????? 6 years ago

that amazing very cool suff could change are life for ever

and we know it is coming but we don't know when it will come

it may not be a super volcano but could be that or something

else that will wipe the earth out and we should belive it

that my though


Lee 5 years ago

We are due for another supervolcanic eruption any minute now, the last eruption was around 600,000 years ago, with 600,000 year intervals. Scinetists are expecting yellowstone to erupt very soon.


Alt_Writer21 profile image

Alt_Writer21 5 years ago

I know this isn't really relevant to the super volcano subject, but have you heard about the volcano in Japan that's expected to erupt soon? I'm currently learning about some of this stuff in my oceanography class and I find it pretty interesting.


LennyP profile image

LennyP 5 years ago from Iowa Author

No I did not hear about that. Researching this article it was quite fascinating to learn how powerful volcanoes can be.


Julie 5 years ago

The ground around Yosemite has risen 19.60 inches since they started measuring it in 2004. I have also heard on the net (that they are trying not to talk about too much) is roughly around 300 micro quakes (deep underground and not felt up above ground) a month.

I am not saying it's going to blow tomorrow or next week... but it is definitely doing something.

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