Posted on 04/10/2005 3:36:29 PM PDT by Strategerist
BBC and the Discovery Channel produced a new docudrama and documentary about Yellowstone. The BBC version was shown in March and the Discovery Channel version will be shown on April 10th.
The docudrama Supervolcano dramatically explores the impact of a large caldera-forming eruption at Yellowstone. The scale of the portrayed eruption is similar to the eruption of the Huckleberry Ridge Tuff at Yellowstone 2.1 million years ago. The movie is realistic insofar as depicting what could happen if an eruption of this magnitude were to occur again. Although the drama is set in the future, it does an acceptable job of addressing some of the issues scientists would grapple with if Yellowstone showed signs of an impending eruption. The questions and answers below shed light on issues related to volcanism at Yellowstone. A much more detailed discussion, including full-color illustrations, can be found in U.S. Geological Survey Fact Sheet 2005-3024, available online at http://pubs.usgs.gov/fs/2005/3024/.
QUESTION: What is the chance of another catastrophic volcanic eruption at Yellowstone?
ANSWER: Although it is possible, scientists are not convinced that there will ever be another catastrophic eruption at Yellowstone. Given Yellowstone's past history, the yearly probability of another caldera—forming eruption could be calculated as 1 in 730,000 or 0.00014%. However, this number is based simply on averaging the two intervals between the three major past eruptions at Yellowstone — this is hardly enough to make a critical judgement. This probability is roughly similar to that of a large (1 kilometer) asteroid hitting the Earth. Moreover, catastrophic geologic events are neither regular nor predictable.
QUESTION: What is a "supervolcano"?
ANSWER: The term "supervolcano" implies an eruption of magnitude 8 on the Volcano Explosivity Index, meaning that more than 1,000 cubic kilometers (250 cubic miles) of magma (partially molten rock) are erupted. The most recent such event on Earth occurred 74,000 years ago at the Toba Caldera in Sumatra, Indonesia.
QUESTION: What would happen if a "supervolcano" eruption occurred again at Yellowstone?
ANSWER: Such a giant eruption would have regional effects such as falling ash and short-term (years to decades) changes to global climate. The surrounding states of Montana, Idaho, and Wyoming would be affected, as well as other places in the United States and the world. Such eruptions usually form calderas, broad volcanic depressions created as the ground surface collapses as a result of withdrawal of partially molten rock (magma) below. Fortunately, the chances of this sort of eruption at Yellowstone are exceedingly small in the next few thousands of years.
QUESTION: Is Yellowstone monitored for volcanic activity?
ANSWER: Yes. The Yellowstone Volcano Observatory (YVO), a partnership between the United States Geological Survey (USGS), Yellowstone National Park, and the University of Utah, closely monitors volcanic activity at Yellowstone. The YVO website (http://volcanoes.usgs.gov/yvo) features real-time data for earthquakes, ground deformation, streamflow, and selected stream temperatures. In addition, YVO scientists collaborate with scientists from around the world to study the Yellowstone volcano.
QUESTION: Do scientists know if a catastrophic eruption is currently imminent at Yellowstone?
ANSWER: There is no evidence that a catastrophic eruption at Yellowstone is imminent, and such events are unlikely to occur in the next few centuries. Scientists have also found no indication of an imminent smaller eruption of lava.
QUESTION: How far in advance could scientists predict an eruption of the Yellowstone volcano?
ANSWER: The science of forecasting a volcanic eruption has significantly advanced over the past 25 years. Most scientists think that the buildup preceding a catastrophic eruption would be detectable for weeks and perhaps months to years. Precursors to volcanic eruptions include strong earthquake swarms and rapid ground deformation and typically take place days to weeks before an actual eruption. Scientists at the Yellowstone Volcano Observatory (YVO) closely monitor the Yellowstone region for such precursors. They expect that the buildup to larger eruptions would include intense precursory activity (far exceeding background levels) at multiple spots within the Yellowstone volcano. As at many caldera systems around the world, small earthquakes, ground uplift and subsidence, and gas releases at Yellowstone are commonplace events and do not reflect impending eruptions.
QUESTION: Can you release some of the pressure at Yellowstone by drilling into the volcano?
ANSWER: No. Scientists agree that drilling into a volcano would be of questionable usefulness. Notwithstanding the enormous expense and technological difficulties in drilling through hot, mushy rock, drilling is unlikely to have much effect. At near magmatic temperatures and pressures, any hole would rapidly become sealed by minerals crystallizing from the natural fluids that are present at those depths.
QUESTION: Could the Yellowstone volcano have an eruption that is not catastrophic?
ANSWER: Yes. Over the past 640,000 years since the last giant eruption at Yellowstone, approximately 80 relatively nonexplosive eruptions have occurred and produced primarily lava flows. This would be the most likely kind of future eruption. If such an event were to occur today, there would be much disruption of activities in Yellowstone National Park, but in all likelihood few lives would be threatened. The most recent volcanic eruption at Yellowstone, a lava flow on the Pitchstone Plateau, occurred 70,000 years ago.
QUESTION: Because Yellowstone is so geologically active, are there other potential geologic hazards in Yellowstone?
ANSWER: The heat and geologic forces fueling the massive Yellowstone volcano affect the park in many ways. Yellowstone's many geysers, hotsprings, steam vents, and mudpots are evidence of the heat and geologic forces. These hydrothermal (hot water) features are mostly benign, but can rarely be the sites of violent steam explosions and pose a hydrothermal hazard. Earthquakes, another example of active geologic forces, are quite common in Yellowstone, with 1,000 to 3,000 occurring annually. Most of these are quite small, although significant earthquakes have shaken Yellowstone, such as the 1959 magnitude 7.5 Hebgen Lake quake, the largest historical earthquake in the intermountain region, and the 1975 magnitude 6.1 quake near Norris Geyser Basin. The many earthquakes and steam explosions in the past 10,000 years at Yellowstone have not led to volcanic eruptions.
Condi?
No doubt. However, major eruptions have worldwide effects, especially on the weather.
Fascinating stuff. I would hope after this airing that many more Americans are aware that Yellowstone is a supervolcano.
I can't believe the amount of educated people who don't know it is.
Watching the replay on Discovery Channel.
Also there was a live chat tonight with Yellowstone's Geologists on Discovery channel that is now indexed fo viewing.
BTTT
This Supervolcano movie really was that terrible. The characters shown to be level headed in this movie are all Europeans. The ignorant American scientist complicit with the cover up was a Jew. (Europeans hate the Jews)
Other observations: the American govt. intentionally keeps information from its people and is slow to help its citizens. Americans in this movie are portrayed as being as wimpy as the Europeans. When the volcano threatens to erupt in Yellowstone, Americans start rioting all over the country. People are dying and we sit back doing nothing because the govt. told us to sit still until the eruptions subsided.
This was obviously a European (BBC) funded movie. They don't know anything about us and our natures. They could not imagine us doing everything possible to save as many people as we could.
Most predictable scene -- Black person leaves the danger area first, only to die when he stops at a motel instead of getting the heck out. There was also some gratuitous godless bashing of a believer.
The funniest scene concerned so called Americans trying to get into Mexico but getting turned away. One member of the disaster control team suggested using force to open the border. I could not control my laughter. The only people who would try to get into Mexico would be all the illegals and I really could see Mexico fighting to keep them from coming back.
I remember Mt. St. Helens. This movie did not come anywhere near showing the resolve of our people. It just reflected the sentiments of laissez faire Europe.
"The funniest scene concerned so called Americans trying to get into Mexico but getting turned away. One member of the disaster control team suggested using force to open the border. I could not control my laughter."
I saw that too and laughed. It's the ' Day after tomorrow' morality lesson that one day we could be the ones who had to get across the boarder. I'd like to see the mexican army seal off a border that is little more than flimsy range fences in most places. Oh, and do it all on less that 24 hours notice.
I admit I only saw the previews, but from them I deduced that if a supervolcano erupts in Yellowstone America will be buffeted by really bad special effects.
I thought she was head of FEMA.
bump
As a Californian, I'm FAR more worried about Long Valley.
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