The Caldera is located in the Northwest corner of Wyoming, it measures about 34 by 45 miles. Over the past 2.1 million years the volcano has had three immense explosive volcanic eruptions the blanketed part of the North American continent with ash. The three eruptions occurred 2.1 millions 1.2 million and 640 000 years ago. So it means eruptions occurred in every 800 000 years (this means that you should be ready at 1:38 pm tomorrow).
From 1000 to 3000 earthquakes typically occur each year within Yellowstone park and and its immediate surroundings. Most recently, a devastating earthquake in 1959 killed 28 people and cause $11 million damage.
Over the past 18 million years or so, this hotspot has generated a succession of violent eruptions and less violent floods of basaltic lava.
The Volcanic activities cause about 10 000 thermal features, over 500 are which of geysers. Geysers are hot spring that erupt periodically. The eruption is the result of super-heated water below ground becoming trapped in channels leading to the surface.
These videos are based on facts, although it's fictional, of what it would be like if Yellowstone's super volcano erupted.
There is also a second film, that you can find on Youtube.
sources: http://volcanoes.usgs.gov/volcanoes/yellowstone/yellowstone_hazard_47.html
http://www.earthmountainview.com/yellowstone/yellowstone.htm
http://en.wikipedia.org/wiki/Yellowstone_Caldera
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