With over 10,000 thermal features, Yellowstone is the world’s largest active volcano, with lava only 4 to 10 miles below the surface in some areas.

Evidence suggests if Yellowstone were to erupt again on this scale:

    * Sheets of magma and pyroclastic flows would cover the entire Yellowstone region, killing tens of thousands of people.
    * An area four times the size of the UK would be thickly covered with several centimetres of ash, while almost all of the US would experience enough ash-fall to cause a serious health hazard.
    * 2,000 million tons of sulphuric acid would be ejected into the atmosphere.

http://www.geographyinthenews.rgs.org/news/article/?id=333

Are you talking about dormant, extinct, and active volcanoes?

http://geology.about.com/library/bl/blbigcalderas.htm

Yellowstone is down the list, but most ahead of it are extinct. And of all on the list, Yellowstone is the most likely to go kaboom anytime soon. And from my sources it shows that Yellowstone’s eruptions have varied with each eruption from just over 1,000,000 cubic meters to over 2,500,000 cubic meters. It is impossible to know how much could be expelled in its next eruption. Not to mention the 2 billion tons of sulphuric acid expelled into the atmosphere.

I’ll give you that Yellowstone is not technically the biggest, but it is easily the most dangerous to civilization. And really, when you are talking about a VEI 8 – size is a relative term. ;-)

 I think you would like it here. Lots of Ron Paul fans! Me included.

i was about a mile and a half from the epicenter of the Whittier quake back in the 80’s

This is just like the population over here, the news is scarce and pretty simple. If you didn’t know this is where all new want-a-be news folks come to cut their teeth in the trade. We have new people on the news here every couple of months. It is comical at time to see the rookies go at it. If they are good they only stay for a few months till they land the next better gig. If they are bad, we have our laughs and then they bring in a new face anyway. Local news is 2/3 weather and 1/3 high school sports.

Here is a quote from wiki about the floor rising:

Volcanic hazards
The last full-scale eruption of the Yellowstone Supervolcano, the Lava Creek eruption which happened approximately 640,000 years ago14, ejected approximately 240 cubic miles (1000 cubic kilometres) of rock and dust into the sky.8
Geologists are closely monitoring the rise and fall of the Yellowstone Plateau, which averages ±0.6 inches (about ±1.5 cm) yearly, as an indication of changes in magma chamber pressure.1516
The upward movement of the Yellowstone caldera floor – almost 3 inches (7 centimeters) per year for the past three years – is more than three times greater than ever observed since such measurements began in 1923.17 From mid-Summer 2004 through mid-Summer 2008, the land surface within the caldera has moved upwards, as much as 8 inches at the White Lake GPS station.18 The U.S. Geological Survey, University of Utah and National Park Service scientists with the Yellowstone Volcano Observatory maintain that they “see no evidence that another such cataclysmic eruption will occur at Yellowstone in the foreseeable future. Recurrence intervals of these events are neither regular nor predictable.”.8

Here is the latest story about Yellowstone that doesn’t have to do with snowmachines in the park. It is a few months old. Scientists Monitor Unusually Persistent Swarm of Yellowstone Earthquakes Read the comments that follow the story. They say that if Yellowstone really goes… suffocation will go as far as Nebraska. And the whole world would feel its effects.

However, I am not a dooms day type of a guy. I prefer to worry more about how my Broncos are going to fair this season, than fret over the end of civilization as we know it. Just passing the posts on as informational stuff.

OMG, in some areas in LA & Orange county people are paying 700 a MONTH.

I’m living in the wrong frigging state. LOL

SSSSShhhhhhhh, don’t tell my wife I said that. :D