Showing posts with label fossilized ash. Show all posts
Showing posts with label fossilized ash. Show all posts

Friday, October 13, 2017

Yellowstone - Mother Nature's Dooms Day Weapon

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Yellowstone’s supervolcano could erupt much faster than anyone thought
 Mike Wehner,BGR News Wed, Oct 11 3:32 PM EDT


There’s a dangerous giant sitting dormant in the United States, and when it finally wakes up it has the potential to cause utter devastation. I’m talking of course about the supervolcano hiding beneath Yellowstone National Park, and while it’s long been thought that any hint of a possible eruption would be seen thousands and thousands of years in advance, new research throws that safety buffer right out the window, suggesting that the Yellowstone Supervolcano could go from calm to critical in as little as decades.

The research, which was presented at the IAVCEI 2017 volcanology conference in Portland, focuses on the most recent eruption of the volcano, which is thought to have occurred some 631,000 years ago. But rather than taking several thousands of years to build up, as previously thought, the newest data suggests that the most recent eruption was prompted by new magma pushing into the Yellowstone system just decades ahead of the big event.
This much more rapid timeframe between dormancy and eruption is obviously very troubling, especially when you consider the global impact that the event could have. The most recent eruption of the Yellowstone system spewed an estimated 240 cubic miles of material into the air. 2.1 million years ago an even larger eruption occurred, sending 585 cubic miles of rock and dust skyward. For comparison, that’s approximately 6,000 times the amount of material launched from Mount St. Helens during its 1980 eruption.
“It’s shocking how little time is required to take a volcanic system from being quiet and sitting there to the edge of an eruption,” Hannah Shamloo, graduate student at Arizona State University and lead author of the study, said of the discovery.

Still, at the moment there’s little reason to be concerned, as the Yellowstone Supervolcano seems to be perfectly content to continue its unusually long quiet spell. When the mighty beast decides to wake back up is anyone’s guess, but now at least we know that we might not have nearly as much warning as we once thought.


Yellowstone Supervolcano Could Erupt Sooner Than We Thought. Here’s What You Need to Know.
 Grace Donnelly 

Did you know there's a supervolcano in Yellowstone National Park? Maybe you've heard that it could erupt with much less advance warning than expected?
Researchers from Arizona State University spent weeks studying fossilized ash deposits from the Yellowstone volcano and recently shared their findings. The minerals in these deposits revealed that the critical changes in temperature and composition preceding an eruption build up over a matter of decades, rather than thousands of years as scientists originally thought.
"It's shocking how little time is required to take a volcanic system from being quiet and sitting there to the edge of an eruption," Hannah Shamloo, a graduate student at Arizona State University who worked on the research, told The New York Times.
This is an alarming thing for a volcanologist to say. The good news is that scientists are likely just decades away from being able to more accurately predict when an eruption would occur.
Sometimes knowing more about the world around us makes us feel more in control of our lives and survival. And sometimes knowing more only underscores how small and helpless we are compared to the forces of nature on the angry rock where we reside.
Here are some more facts about supervolcanoes that may or may not make you feel any better.
Is Yellowstone the only supervolcano to worry about?
No, of course not. There are about 20 others around the world and three others, besides the Yellowstone supervolcano, in the U.S. Scientists suspect that one of them erupts every 100,000 years or so.
While Yellowstone hasn't had a super-eruption in 631,000 years, others have been active more recently. Campi Flegri, a supervolcano in Italy whose name translates to "burning fields," had a super-eruption 15,000 years ago.
Campi Flegri is in a "critical state," according to researchers in Italy. It's due for an eruption soon, but it would be a minor event compared to the 72 cubic miles of molten rock it spewed in its most notorious eruption 39,000 years ago, called Campanian Ignimbrite, that likely contributed to the extinction of the Neanderthals.
What areas would a Yellowstone eruption affect?
If the Yellowstone supervolcano erupts, it could shoot out more than 1,000 cubic kilometers of rock and ash into the air.
That's 250 cubic miles. That's more than three times as large as the Campanian Ignimbrite eruption in Italy, which created a sulfurous cloud that floated more than 1,200 miles away to hang over Russia. That's 2,500 times more material than Mount St. Helensexpelled in 1980, killing 57 people.
An eruption at Yellowstone would result in a cloud of ash more than 500 miles wide, stretching across nearly the entire western United States.
The explosion could be so incredibly large that it could plunge the entire planet into a volcanic winter. That means it would be impossible to grow crops and current food stores would only last about 74 days, according to a 2012 estimate by the United Nations(though innovations in farming may mean that food could be grown underground).
Will a supervolcano eruption end life on Earth?
None of this sounds ideal, but how does it rank in terms of apocalyptic near-future possibilities? According to NASA, supervolcano eruptions are a bigger danger to life on Earth than any asteroid.
Luckily NASA has a plan to neutralize supervolcano threats. It would cost approximately $3.4 billion and involves drilling down just over 6 miles into the volcano in order to release heat and hopefully avoid a violent eruption.
This plan could cool the supervolcano over the course of hundreds or even thousands of years. There’s another bonus: It would become a source of geothermal energy, too. But there are considerable risks, too. It could trigger the eruption it's meant to save us from.
How likely is it that the Yellowstone supervolcano will erupt?
Despite the fact that this new research shows conditions leading up to supervolcano eruption could occur in several decades, the chances that you will personally experience an explosion of this scale are still low.
The odds of the Yellowstone supervolcano erupting within a given year are one in 730,000, according to the U.S. Geological Survey. Here’s a little perspective: Those odds are significantly better than your chances of winning the lottery and only slightly worse than the chance you'll be struck by lightning.




WHEN WILL YELLOWSTONE ERUPT? SUPERVOLCANO COULD RUMBLE TO LIFE FAR FASTER THAN WE THOUGH
BY HANNAH OSBORNE ON 10/12/17 AT 9:42 AM

Yellowstone supervolcano last erupted 640,000 years ago.JIM URQUHART/REUTERS

Before the Yellowstone supervolcano next erupts, we might have only a few decades to prepare—not thousands of years, as previously thought. By analyzing the last eruption to take place, a team of researchers has estimated how long it took for the required amount of magma to build up in the main chambers. The preliminary findings show it happened startlingly fast.
The last major eruption at Yellowstone—one of the world’s largest active supervolcanoes—took place around 640,000 years ago, sending about 240 cubic miles of volcanic ash, dust and rock into the sky.
If an eruption were to talk place today, experts estimate a blanket of ash would cover most of the U.S. "Ash-fall thicknesses of centimetres throughout the American Midwest would disrupt livestock and crop production, especially during critical times in the growing season,” a 2014 report said. "Thick deposits could threaten building integrity and obstruct sewer and water lines. Electronic communications and air transportation would likely be shut down throughout North America. There would also be major climate effects."

To understand what goes on beneath Yellowstone before an eruption—in a bid to work out what might happen prior to the next one—researchers at Arizona State University analyzed the last big eruption, looking at crystals that show the changes that took place in the run-up to the event.
Hannah Shamloo, a graduate student at the university, and colleagues presented the team’s preliminary findings at a volcanology conference in September. According to The New York Times, she said changes to the crystals indicate there was a fast increase in temperature at the site. The magma appears to have accumulated very quickly, and then an eruption occurred a few decades later. “It’s shocking how little time is required to take a volcanic system from being quiet and sitting there to the edge of an eruption,” Shamloo said.

The findings do not help scientists predict when the next eruption might take place. They could, however, serve as something of an early warning system. By monitoring what’s going on underneath Yellowstone, they can track changes to the magma and be on alert if it starts accumulating.
Mike Poland, the scientist in charge of the Yellowstone Volcano Observatory at the U.S. Geological Survey, says the research is interesting, and while the results are preliminary, they potentially open the door to many more questions—including what processes actually trigger rapid magma movement and an eruption.
“I think it's important to note that these results say that the rejuvenation of Yellowstone's magma system may have occurred over decades prior to eruption,” he tells Newsweek. “The research does not provide any information about what actually triggered the eruption.

Ground deformation at Yellowstone National Park over the last two years. USGS

“One thing I would emphasize is that even if large eruptions are preceded by only decades of unrest, this is still something we are positioned to detect well in advance. Yellowstone is one of the best-monitored volcanoes in the world, with a host of seismic, deformation, thermal and geochemical sensors and satellite datasets always looking for changes,” Poland says.
An example of this was the earthquake swarm that has been taking place at the supervolcano since June. Since it began, almost 2,500 earthquakes have been recorded at the site—making it the longest and most vigorous swarm since 1985.
“We see interesting things all the time, but we haven't seen anything that would lead us to believe that the sort of magmatic ‘rejuvenation’ event described by the ASU researchers is happening now,” Poland says. “We're in a good position to see that sort of event thanks to the monitoring systems that are in place—seismicity (not just the numbers of earthquakes, but also their types) would change drastically, as would styles of deformation, and there would probably be significant thermal manifestations. 
“The research does a great job of helping us understand the conditions that set up the last large eruption at Yellowstone. Hopefully, the researchers will continue their investigations to see what more the crystals they are studying can tell us, particularly about the specific conditions that led to the eruption.”

Yellowstone supervolcano may be only decades from a catastrophic eruption
 Aris Folley, AOL.com,AOL.com 


Researchers are saying the supervolcano sitting beneath Yellowstone National Park could erupt sooner than thought -- and could possibly plunge the planet into a "volcanic winter."
It's been roughly 631,000 years since Yellowstone's last super-eruption and, until now, scientists thought it would take centuries for the supervolcano to make the transition, according to National Geographic.
Now, after analyzing minerals in fossilized ash from Yellowstone, researchers from Arizona State University are saying the lava-filled mountain could erupt in just a few decades.
The discovery arrives several years after a 2011 study found that the ground above Yellowstone's caldera had risen as much as 10 inches in some places over the course of seven years.
"It's an extraordinary uplift, because it covers such a large area and the rates are so high," the Bob Smith, an expert in Yellowstone volcanism at the University of Utah, told National Geographic at the time.
Researchers are also saying the supervolcano has the ability to produce an eruption of a thousand times more powerful than Mount St. Helen's eruption in 1980 and eject more than 1,000 cubic kilometers of rock and ash -- which could blanket large areas of the US.
Arizona State graduate state Hannah Shamloo, who developed the theory that there was a much shorter timeline than once anticipated for an eruption, spent weeks with several colleagues at the site in Yellowstone where they collected and studied fossilized ash from its last eruption.
"It’s shocking how little time is required to take a volcanic system from being quiet and sitting there to the edge of an eruption," Shamloo told New York Times, while adding that more research is necessary before drawing definite conclusions.
Though the pair presented the study at a recent volcanology conference before the American Geophysical Union in 2016, it has yet to be peer-reviewed.