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Old 11-30-2017, 06:22 AM
 
Location: St Simons Island, GA
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Quote:
Originally Posted by C24L View Post
Id say the most infamous historically would be St Pierre since 25,000 to 40,000 people died there as a result of a eruption by Mount Pelee when it sent a pyroclastic flow into the city in the span of 2-3 minutes.Austin,Texas was built on top of volcanoes or at least there is one volcano by the airport.
C2, I had never heard about this before. Fascinating.

Pelee | Volcano World | Oregon State University
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Old 11-30-2017, 09:25 AM
 
Location: Albuquerque, NM
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Quote:
Originally Posted by grega94 View Post
are these fields still active? And if they are extinct do we include extinct volcanoes in our list?
I know two of the ABQ volcanoes are classified as dormant (Vulcan and Black, IIRC) because, although they haven't erupted in historic times, they have weak plugs to a rising magma chamber (Socorro magma body), thus retaining the possibility for future eruptions, albeit not within our lifetimes.
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Old 11-30-2017, 03:48 PM
 
Location: Aurora, Colorado
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Bozeman is right next to Yellowstone
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Old 12-01-2017, 02:54 AM
 
Location: Washington State desert
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Originally Posted by Mezter View Post
Bozeman is right next to Yellowstone
I wouldn't worry too much about Yellowstone. That last mega-eruption there was 640,000 years ago. The one before that was 1.2 million years ago, and the one before that 2.1 million years ago. Now, obviously, it could happen tomorrow, but the odds would be extremely small.
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Old 12-01-2017, 02:14 PM
 
Location: Albuquerque, NM
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Originally Posted by pnwguy2 View Post
I wouldn't worry too much about Yellowstone. That last mega-eruption there was 640,000 years ago. The one before that was 1.2 million years ago, and the one before that 2.1 million years ago. Now, obviously, it could happen tomorrow, but the odds would be extremely small.
Sounds like they get more frequent. At that rate, it would be due around 650,000 since the last eruption. Still remote for tomorrow, or even within our lives, however, and could even be double that time.
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Old 12-02-2017, 03:05 AM
 
Location: Washington State desert
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Quote:
Originally Posted by kehkou View Post
Sounds like they get more frequent. At that rate, it would be due around 650,000 since the last eruption. Still remote for tomorrow, or even within our lives, however, and could even be double that time.
Another important aspect about Yellowstone is that unlike hundreds of thousands or millions of years ago, today we have technology to predict these type of mega eruptions well ahead of time. I would suppose that if there was a good indicator of a new problem at Yellowstone, the advance notice would offer an evacuation of the areas that could be affected. That being said, the complete ash event would certainly shut down agriculture, transportation, etc. anywhere near or east of Yellowstone. Probably would bring global cooling for several years as well. But again, this is unlikely in any of our lifetimes. We are dealing with hundreds of thousand years in this scenario.
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Old 12-08-2017, 12:11 PM
 
Location: Carrboro, NC
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Quote:
Originally Posted by grega94 View Post
are these fields still active? And if they are extinct do we include extinct volcanoes in our list?
Yes.

The San Francisco field erupts every few thousand years and could go off any minute.

Valles has active fumaroles, and is considered active. It is also the biggest threat of all the southwestern volcanoes, as it is a supervolcano similar to Yellowstone, and it's much younger and erupts more frequently.

Valles Caldera, Jemez Volcanic Field | New Mexico Museum of Natural History & Science
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