For preppers, it’s the ultimate end game: surviving the eruption of Yellowstone’s super volcano.

While some folk worry about an asteroid strike bringing about the end of the world as we know it, as scientists say it did for the dinosaurs 65 million years ago, North America is actually sitting on its own extinction-level event waiting to happen.

“Everything would be wiped out; it would take years for the climate to recover and decades for the rivers to clear up because everything would be choked with volcanic ash for a wide area around the eruption site,” said Kelly Russell, professor of volcanology at the University of British Columbia. “The southern latitudes of Alberta, Saskatchewan and Manitoba would all see ash cover, how thick it would be depends on the winds and the amount of magma.”

Russell stresses that such super eruptions are extremely rare — the last one happened before human civilization — but that they can and do happen, and Yellowstone, in Yellowstone National Park in Wyoming, is an active field that has seen three massive eruptions.

He compares Yellowstone to Mount St. Helens in Washington state in 1980.

“It produced one cubic kilometre of magma, and we saw ash fall from it in southern B.C., a small amount, but it was there, and when we look at the very largest eruptions that have taken place at Yellowstone, they can spew out a thousand cubic kilometres, so that’s a thousand times larger than the Mount St. Helens eruption that’s in everybody’s minds.”

Russell points out that two feet of ash from the Crater Lake eruption in Oregon 7,700 years ago can be found in Oliver, B.C., and in the banks of the Bow River in Calgary. He says if Yellowstone cuts loose, the southern Canadian prairies could get covered in many feet of ash, and the American states closest to Yellowstone would be smothered with an even thicker layer of the sterile rock powder, killing off livestock and leaving them unable to grow food.

“The ash is terrible, take a window and grind it into a coarse flour, then breath that in, it does terrible things to the human body. It would be important to have masks and filters, if you were trying to survive it,” Russell said. “The United States would stop being a food-exporting nation and starting being a food-importing nation.”

Yellowstone’s volcano doesn’t have the classic menacing cone shape, so many people don’t know that a magma chamber bigger than New York City lies beneath the steaming surface.

640,000 years ago, animals similar to elephants, rhinoceroses and zebras roamed the plains of the United States when Yellowstone blew — and it took out the animals and every other living thing that couldn’t fly away from the blast.

Scientists estimate Yellowstone’s volcano explodes every 600,000 to 700,000, and some say the time could be coming for another eruption. If it blows, the chances of survival sound bleak, but that’s not stopping some survivalists from preparing.

“Some people who visit there say there are more hot springs popping up there, and there is more of a sulphur smell that’s stronger than ever. You take from it what you want and I just pay attention to it a little more than the average person, just in case,” said Jason Charles, a firefighter in New York City. “I don’t want it to be a curve ball we don’t see coming. I keep it in the back of my head.”

Charles was a paramedic on 9/11 and saw thousands of people struggling to breath through the toxic dust. He has special dust and ash filters for his gas mask in case of another NYC disaster, or if Yellowstone blows.

“I know some people who have bought UV lights, in case they need to grow their own food – but that’s also assuming that the power grid stays up, but then there’s a space issue, how much could you grow?” he said. “It’s better to store food that will last.”

Charles has a one-year supply of food for his family, including his wife and four children. Meal-ready-to-eats (MREs), canned pasta and lots of canned fruit are stuffed into his apartment and his storage locker. He prepares for all sorts of disasters because he says no one should depend on the government to save them.

“The government couldn’t handle (Hurricane) Katrina. Compared to Yellowstone, Katrina was a drop in the bucket,” he said. “I have always heard as a rumour, they would wait for the masses to die and whatever survivors are left, that’s who they’d take care of, because they can’t take care of hundreds of millions of people we have living here in the United States.”

Jake Lowenstern, a geologist with the U.S. Geological Survey, is the guy in charge of the Yellowstone volcano observatory.

“Worst-case scenario, a super eruption is a thousand cubic kilometres of material gets sent out of the magma chamber. When that happens it’s going to send out a lot of ash, and it circles the globe and changes the climate for years, drops the temperature for a few years,” Lowenstern said.

He said while a super eruption is highly unlikely, and even if it does happen not many would survive, it doesn’t hurt to prep.

“Things you can do to prepare for one kind of disaster are useful for any kind of disaster: lots of food, water, medical supplies and batteries on hand, and for an eruption, add good masks, air filters and weather stripping to keep the ash out of homes.”

Massive eruptions of the past:

— Archeologists say human beings barely survived the last super eruption on Earth. 74,000 years ago, Toba blew up on the Island of Sumatra. It cloaked the planet in sulphur, reducing the temperature by 20 degrees, wiping out growing seasons with snow cover nearly all year and causing mass starvation. Geneticists say the disaster reduced the human population to as few as 1000 people, thus causing the genetic similarity between individuals which is traced to the same time period.

— A volcanic eruption has been blamed for plunging civilization into the Dark Ages and triggering the bubonic plague. In his book Catastrophe, archeological journalist David Keys pinpoints a Krakatoa explosion in 535 AD. He says with the power of two billion Hiroshima bombs it darkened the sky and caused drought and flooding all around the world, including in Northeast Africa, which led to a bumper crop of rodents that passed their infected fleas onto rats and mice on European ships docked for trade off of southern Egypt, beginning the spread of the plague of Justinian.

— In 1815, the Tambora volcano erupted in the East Indies. Global temperatures dropped. Europeans and North Americans called it a “year without summer.” Snow fell in New York in June. Frost was recorded in each of the summer months and crops failed. 200,000 people died in Eastern and southern Europe from starvation and typhus.

— In 1783, Iceland’s Laki Volcano erupted. 9,000 people died in Iceland and thousands more died around the world from crop failure, disease and starvation. Temperatures dropped 13 degrees Celsius.

— Mount Pinatubo erupted in 1991 in the Philippines, a comparably small explosion, ejecting 20 million tonnes of sulphur. Scientists say it reduced global temperatures by about 2 degrees.