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Showing posts with label volcano eruption. Show all posts
Showing posts with label volcano eruption. Show all posts

Sunday, August 31, 2014

Donie's Ireland daily news BLOG update

Unhappy Irish doctors planning a protest march on Dail

   

Family doctors are planning to down their stethoscopes and march on the Dail for the first time in their history in protest at funding cuts which they say are putting patients at risk.

The GPs are proposing to hand in a petition to Health Minister Leo Varadkar calling for more investment in general practice in the wake of cuts to fees for treating medical card holders and other services in recent years.
The doctors are to be asked to give free GP visits to children under six and everyone over 70 from the beginning of next year – but the fees they will be paid have yet to be agreed.
Up to now doctors have tended to confine their protests to representation through their membership bodies and public statements, rather than taking to the streets.
It is unclear how large the turnout will be, but the hope is that several hundred will leave their surgeries and take to the streets for the public display of discontent on September 24.
The National Association of General Practitioners said it cannot call on any GP to join the march due to competition law, but it is expected to help in organising the demonstration and transport.
GPs have become increasingly vocal in the last year, with rising numbers with established practices opting to uproot and go abroad to earn a better living.
Meanwhile, the Labour Relations Commission has proposed a committee, chaired by heart surgeon Eilis McGovern, be set up to assess which newly-recruited consultants get higher starting salaries.
The group will also include two Irish Medical Organisation representatives.
Under new proposals recruits are entitled to starting pay of between €120,000 and €155,000. Doctors with experience could get up to €155,000.
The Labour Relations Commission said the committee could assess each doctor’s claim and decide how much they should get on top of the basic €120,000.
If the doctor wants to challenge the salary they are offered they can appeal to the chief executive of the Labour Relations Commission, Kieran Mulvey.
The HSE is to begin a recruitment campaign to secure more new consultants for hospitals in a bid to reduce waiting lists.
Dr Gerard Crotty, president of the Irish Hospital Consultants Association, said the HSE’s decision to begin advertising jobs, without agreement from doctors’ bodies, had the potential to worsen the recruitment crisis.

US economy expands by 4.2% following contraction

BUSINESS INVESTMENT INCREASED 8.1%, THE MOST SINCE EARLY 2012

  

A surge in demand for airplanes helped push orders for durable goods up at a record pace in July, boosting prospects for sustained growth in US manufacturing,

The US economy expanded more than previously forecast in the second quarter, propelled by the biggest gain in business investment in more than two years that bodes well for the rest of 2014.
Gross domestic product, the value of all goods and services produced, rose at a 4.2 per cent annualised rate, up from an initial estimate of 4 per cent and following a first-quarter contraction, according to the latest figures.
Corporate profits climbed by the most in almost four years. The improvement has carried over into the second half with companies such as General Electric seeing more orders for equipment and a strengthening job market underpinning consumer spending, which accounts for about 70 per cent of the economy.
Better prospects for growth signal Federal Reserve officials will continue to wind down monthly asset purchases. “The economy is clearly doing better,” Jim O’Sullivan, chief US economist at High Frequency Economics in Valhalla, New York, said before the report.
“Business spending is picking up. We’ll see stronger consumer spending in coming months.”
Another report today showed the number of Americans filing for unemployment benefits were little changed last week as employers held on to staff in an improving economy. Claims decreased by 1,000 to 298,000 in the week ended August 23rd from 299,000 in the prior period, the Department of Labor reported.
Business investment increased at an 8.1 percent annualised rate, the most since the first three months of 2012. Companies are buying more equipment as earnings improve. Today’s report also offered a first look at corporate profits. Before-tax earnings rose 8 per cent last quarter, the most since the third quarter of 2010, after a 9.4 per cent drop in the prior period. They were still down 0.3 per cent from the same time last year.
Corporate investment data are indicating a pickup. A surge in demand for airplanes helped push orders for durable goods up at a record pace in July, boosting prospects for sustained growth in manufacturing,

Walking a mile each day ‘cuts cancer death risk by 50%

PHYSICAL ACTIVITY DESCRIBED AS ‘WONDER DRUG’ FOR BREAST AND PROSTATE PATIENTS

 

  • Patients can cut risk of dying by half by walking one mile a day, study finds
  • Those with breast cancer can reduce risk by up to 40% via physical activity
  • For bowel cancer patients, doubling walking distance ‘halves risk of dying’
  • Research carried out by Walking for Health, run by Macmillan and Ramblers
  • Calculations were based on walking one mile at a moderate pace of 3mph
Cancer patients can cut their risk of dying by up to half – simply by walking just one mile a day, according to experts.
A study revealed physical activity as a ‘wonder drug’, with those diagnosed with breast and prostate cancers able to cut their risk of death by up to 40 per cent.
And for bowel cancer patients, doubling the walking distance was found to halve the risk of dying.
The calculations are based on walking one mile at a moderate pace of 3mph, which would take just 20 minutes a day.
The research by Walking for Health, a network of walking groups run by Macmillan Cancer Support and the Ramblers, found physical activity can also reduce the impact of some debilitating side effects of cancer treatment, such as swelling around the arm, anxiety, depression, fatigue, impaired mobility and weight changes.
The charity estimates that 1.6million of the two million people living with cancer in the UK are not active at recommended levels.
Ciarán Devane, chief executive of Macmillan Cancer Support, said: ‘Today’s research highlights the very simple reality – walking can save lives.
‘We cannot continue to turn a blind eye to what is a very simple and obvious solution. Physical activity is a wonder drug and health care professionals must prescribe physical activity, such as walking, as a standard part of cancer recovery.’
Sandra Sayce, 51, who is married and lives in Middlesex, joined her local Walking for Health group in 2011 following years of treatment for melanoma.
She said ‘I had been ill with cancer for several years, which at its worst had left me unable to walk more than 50 metres.
‘When I joined my local Walking for Health group it gave me the push I needed to make those vital first steps back into physical activity; despite the cold January weather, I was able to take part in the simple, easy-going walk which was crucial to beginning my recovery.
‘Since then I’ve gone from strength, and I’ve started to feel more happy and less tired. I really do think that making the decision to go on that first walk was crucial to getting myself to the position I’m in now.’
It is unclear how activity helps, but the effect goes further than simply weight control, which cuts down on the amount of cancer-promoting hormones produced by body fat.
The latest thinking is exercise may break down oestrogen to produce ‘good’ metabolites that lower the risk of some cancers.
The reduction in risk of death from cancer is based on research review evidence in Macmillan Cancer Support’s Move More report.
It says breast cancer patients cut the risk by 40 per cent if they do recommended levels of activity, compared with those doing less than an hour a week.
The risk is reduced by 30 per cent for men with prostate cancer.
Bowel cancer sufferers who walk 18 miles a week – 2.5 miles or around 50 minutes a day – can cut their risk of dying by 50 per cent.
Walking for 150 minutes a week at 3mph results in total walking of 7.5 miles in a week – just over a mile, or 20 minutes a day.
Government guidelines advise all adults to do 150 minutes of moderate activity such as gardening, dancing or brisk walking, or 75 minutes of vigorous exercise including playing sport, running or aerobics every week.
Just 36 per cent of British women meet the moderate activity target.
Benedict Southworth, chief executive of the Ramblers, said: ‘The benefits of walking are numerous. It is increasingly clear that walking even short distances regularly can make the world of difference for those recovering from and managing cancer or other serious health conditions.
‘Walking for Health offers free, short group walks across England, which are the perfect way to build confidence and fitness in a friendly, supportive space.
‘All walks are led by friendly, knowledgeable people, specially trained for the job. Many of our walkers have long term conditions such as cancer themselves and find the companionship and fresh air a wonderful therapy.
‘We want to put walking at the centre of efforts to tackle physical inactivity and echo Macmillan’s call for health professionals to prescribe walking to those who are recovering from cancer or other health conditions.’

Iceland lowers volcano eruption alert for aviation

  

Iceland reduced its aviation warning level to orange on Friday after concluding that a small eruption in the Bardarbunga volcano system that triggered a hours-long red alert actually posed no threat to aircraft.

No sign of ash like that from the Eyjafjallajokull eruption that shut much of Europe’s air space in 2010 has been detected this time. But the Icelandic Metrological Office said a no-fly zone in a radius of 3 nautical miles just above the Bardarbunga volcano in central Iceland would remain in effect.
“The small eruption is not a threat to aviation and the published aviation warning area has been cancelled,” the Met Office said in a statement.
Iceland’s largest volcanic system, which cuts a 190-km-long and up to 25-km-wide swathe across the North Atlantic island, has been hit by thousands of earthquakes over the last two weeks and scientists have been on high alert in case of an eruption.
Reykjavik’s Met Office said that just after midnight an estimated 1-km-long fissure eruption began in a lava field north of the Vatnajokull glacier, which covers part of the Bardarbunga system.
While the risk of an ash cloud is highest in case of a sub-glacial eruption, Icelandic authorities for a few hours raised the aviation warning level to red, the highest on a five-color scale and indicating that an eruption is imminent or under way, with a risk of spewing ash.
The latest eruption was at the tip of a magma dyke 40 km from the main Bardarbunga crater and activity subsided to relatively low levels after peaking between 0020 and 0200 GMT, Met Office seismologist Martin Hensch said earlier.
He said that it was impossible to say how the eruption would develop.
“One of the concerns is that the fissure opens into the glacier but presently there is no sign of that happening,” he said, adding that the eruption was 6-8 km from the glacier.
Nick Petford, a vulcanology expert at the University of Northampton in Britain, said fissure eruptions were often spectacular, but relatively low key and often died out in a couple of days. But there could be a sting in the tail, he said.
“Exactly the same thing happened in 2010 with the Eyjafjallajokull volcano,” Petford said. “The main eruption was in April, but in March there was a fissure eruption which was a precursor to the much larger eruption.”
The Eyjafjallajokull event was particularly disruptive because it pushed ash up to precisely the elevation used by transatlantic aircraft, while prevailing winds propelled the cloud into European air space. The ash was also particularly sticky due to its chemical composition.
Petford said that if the current eruption subsided, scientists would be looking for signs of more quakes deeper under the volcano, which would suggest more magma was welling up, and for any swelling of the volcano that could be measured using GPS.
“Those are pretty clear evidence that large amounts of magma are being stored within the volcano and that’s a good indication it will explode.”

Whiskey sent into space is coming back to Earth

  
There’s a lot of research happening on the International Space Station that can help us make advancements in science, technology and what we know about our universe. However, they usually don’t seem as fun as this recent research program about to make its way back to Earth.
A Scottish whiskey distillery set up an experiment several years ago to have astronauts develop whiskey particles in space. Now, the whiskey is making its way back home.
Ardbeg, a Scotch whisky distillery in Islay, Scotland, partnered with the Texas-based space research company NanoRacks to get the experiment off the ground. They sent 20 vials of whiskey particles, along with pieces of charred oak that they were treated with, into space in 2011. The vials didn’t contain actual whiskey liquor but microbes that could be later used to brew whiskey.
The particles landed at the International Space Station where they have been orbiting the planet 15 times a day at 17,227 miles per hour. The point of the experiment is to see how the compounds in the vials, technically known as “terpenes,” interact with the charred oak in Earth’s gravity and then in micro-gravity in space. Terpenes can be found inflavorings and paints, in addition to whiskey.
“NASA approved the project since terpenes have never been grown in zero-gravity conditions,” NanoRacks CEO Jeffrey Manber told ABC News.
Manber also told ABC News that the findings of the research won’t just impact future production of alcoholic beverages. The results of the experiment can also impact consumer products in general and help us better understand materials and biologicals.
The vials will be back on Earth on Sept. 12 where they will land in Kazakhstan. There’s a nifty countdown clock featuring a bottle of Ardbeg whiskey soaring through space in case you need to quell your anticipation. Once the specimens are back on Earth, they will be shipped to NanoRack in Texas where the results of the maturation process will be examined. The findings will be revealed in a paper at a later date.
Whiskey particles aren’t even the weirdest objects to have been sent into space. LEGO figurines were launched into space as part of a partnership between NASA and the LEGO Group to encourage children to study science and technology. The original lightsaber Luke Skywalkerused in “Star Wars Episode IV: Return of the Jedi” went out of this world with the Space Shuttle Discovery in 2007. There’s even a company devoted to launching people’s cremated remains into space called Celestis. One of its most famous participants is Gene Roddenberry, the creator of “Star Trek,” whose remains are expected to be launched into space, along with his wife Majel, in 2016.   

Monday, January 6, 2014

Donie's Ireland news BLOG Sunday

Taoiseach Kenny & Co heads to Gulf for trade and diplomatic mission

 

Over 80 Enterprise Ireland linked firms on trip to Saudi Arabia, Qatar, Dubai and Abu Dhabi

Taoiseach Enda Kenny is to arrive in Saudi Arabia today to lead an Enterprise Ireland trade mission in Riyadh, Qatar, Abu Dhabi and Dubai (pictured).
Taoiseach Enda Kenny is to arrive in Saudi Arabia tonight ahead of a trade mission and a series of diplomatic engagements in the Gulf region.
Mr Kenny and Minister for Enterprise, Jobs and Innovation Richard Bruton are joining more than 80 companies on a five-day Enterprise Ireland mission aimed at creating deeper economic links between Ireland and the region.
The visit will see the Taoiseach visit the Saudi Arabian capital Riyadh as well as Doha in Qatar, Abu Dhabi and Dubai. The four economies have a combined annual GDP of some €1.2 trillion.
The Gulf region will continue to see significant investment in the coming years ahead of big ticket events such as theWorld Cup in Qatar in 2022 and the World Expo in Dubai in 2020.
There is also significant construction work being carried out in the region, a growing agricultural industry and likely opportunities in areas such as healthcare, software and ICT which Irish firms and officials hope can lead to investment, trade and jobs.
Mr Kenny is to meet dignitaries such as Saudi Arabia’s deputy prime minister Crown PrinceSalman, Qatari prime minister Abdullah bin Nasser bin Khalifa al Thani, and the emir of Qatar, Sheikh Tamim bin Hamad Al Thani.
He will also meet Abu Dhabi’s minister for foreign affairs Sheikh Abdullah bin Zayed al Nayhan, and UAE prime minister Sheikh Mohammed bin Rashid al Maktoum in Dubai.
“This visit will strengthen our economic, political and cultural ties with these key priority markets for Ireland as well as providing an opportunity to explore new commercial opportunities and build on the strong educational links that exist between Ireland and the Gulf States,” the Taoiseach said in a statement.
Irish companies with backgrounds in areas such as agriculture, energy, construction and audio visuals products are among those taking part in the mission.
Goods worth some €626 million were exported from Ireland to Saudi Arabia in 2012 with chemicals, food and livestock, and machinery the main areas of trade, according to Central Statistics Office figures.
The United Arab Emirates (which includes Dubai and Abi Dhabi) purchased Irish goods worth €373 million in 2012 and exports worth more than €58 million were dispatched to Qatar.
Mr Bruton said he hoped the diplomatic and trade visit could deliver “tangible results for the Irish economy”.
“The Gulf offers huge opportunities for Irish business and this mission of 87 companies led by the Taoiseach demonstrates our commitment to delivering on that,” he said.
Mr Kenny is also due to visit the historic Al Masmak Fortin Riyadh and Dubai’s Burj Khalifa, the tallest manmade structure in the world at 829.8 metres, during the missions which continues until Thursday.

Reform Alliance to hold conference at the RDS

 

Billy Timmins says event will focus on policy and is not a step towards the launch of new party

Reform Alliance member and Wicklow TD Billy Timmins who said the conference would focus on political, economic and health reform.
The Reform Alliance, comprised of breakaway Fine Gael TDs and Senators, is to hold its first conference on January 25th, at the RDS in Dublin.
Wicklow TD Billy Timmins said the one-day event would focus on three policy areas of primary concern to members of the grouping; political, economic and health reform.
Mr Timmins said the conference would not focus on political ideology and was not intended as a step towards the establishment political party, he told RTÉ.
Last month it emerged that the Reform Alliance, which was formed by five TDs and two Senators expelled from the Fine Gael parliamentary party for voting against the party whip, has registered with the Standards in Public Office Commission as a “third party”.
The move allows the group to raise funds and accept donations, but “third party” registration does not mean a separate political party is being established.
Roscommon deputy Denis Naughten, a member of the group, said registration was primarily a device that will allow the group raise funds to carry out political research.
He said the group receives no exchequer funding under the leader’s allowance, unlike political parties and independent TDs and Senators. That is because all were elected as members of Fine Gael but the party still receives funding for each of the seven parliamentarians despite them being outside the parliamentary party.
Another leading member of the group Lucinda Creightonalso emphasised that the Reform Alliance was in the process of registering as a “third party” and not as a political party.

Pope Francis to visit Holy Land in May

    

The Pontiff will visit Jerusalem, Bethlehem in the West Bank and also Amman in Jordan

Pope Francis waves as he leads the Angelus prayer from the window of the Apostolic palace in Saint Peter’s Square today.
Pope Francis this morning confirmed he will visit the Holy Land in May.Speaking at his Sunday Angelus in a rain-soaked St. Peter’s Square, the Pope said: “God willing, I will make a pilgrimage to the Holy Land from May 24th to May 26th next”.The Pope outlined some details of his itinerary, saying he would visit Amman in Jordan, as well as Bethlehem and Jerusalem.
He also indicated one of the key moments of the trip will be an Ecumenical Meeting at the Church of the Holy Sepulchre in Jerusalem, a meeting due to be attended by Orthodox Christian Patriarch Bartholomew of Constantinople, as well as representatives of other Christian Churches in Jerusalem.
For some time, there had been speculation the Pope would announce this trip during the Christmas-New Year period.
In the end, Francis chose to make the announcement on the day that marks the 50th anniversary of an historic meeting between Pope Paul VI and Patriarch Athenagorasin Jerusalem on January 5th, 1964.
The Pope said one of the main reasons for making the trip now is to commemorate the visit made by his predecessor.
The Pope’s trip to Israel may not be his only international visit this year since Vatican insiders suggest he is also very keen to visit Asia, with the Philippines, Japan, South Korea and Sri Lanka indicated as possible destinations.

French Scientists find a natural hormone (Buzzkill) that counteracts marijuana high

 

Pregnenolone might be released by the body to fight the nice feelings created by pot. At least that’s what French scientists believe.

THEY’RE DANCING happily IN THE STREETS OF COLORADO.

Why would anyone want to dampen their joy at being able to legally buy pot?
Yet along comes a bunch of French researchers to suggest that the brain has natural defenses against the nice feelings generated by the very popular plant.
As Agence France-Presse reports, the researchers probed with lab rats and discovered that the naturally occurring hormone pregnenolone seems to counteract the high delivered by marijuana.
The research, published in Science magazine, explained that initially pregnenolone was thought to be “the inactive precursor of all steroid hormones.”
However, in this experiment, “pregnenolone antagonized most of the known behavioral and somatic effects of THC.”
Science did, though, offer a prognostication that might numb more than a few. It suggested that this research “could lead to new approaches to treating marijuana intoxication and addiction — and it may allow researchers to isolate the medicinal properties of cannabis while blocking its behavioral and somatic effects.”
Wait, do these people really think they’re going to make all those medicinal marijuana cards actually be used only for genuine medicinal purposes?
Pier Vincenzo Piazza of the French Institute of Health and Medical Research told the AFP that the rats in this research were very high. They were given 3 to 10 times the amount of pot than a normal Coloradan.
On discovering that the pregnenolone inhibited the effects of rats’ highness, the researchers began to experiment on human cell lines. Similar results were achieved. The next step will be a full-scale clinical trial.
Their aim, they say, is to combat marijuana addiction. This is a concept with which some might argue, as they believe that, well, there is no such thing.
“These researchers weren’t trying to be buzzkills,” Science explained.
I wonder whether the world’s marijuana lovers will come to revere this potential breakthrough.

An emigrant of Ireland 92 frozen in time

 Meeting Lane, Athy, 1968. Photograph:  William Muldowney

(Left photo) William Muldowney in 1956 & Meeting Lane, Athy town, 1968.

Photos of 1960s Ireland taken by William Muldowney (92) have gained a following on Facebook

“I think we are lonely for a world that is gone,” says Irish-born emigrant William Muldowney (92) by way of explanation for the “astonishing” reaction to his old photographs of his childhood locality posted on Facebook.
In September his daughter, Maureen Flooks, set up a page on the social networking site called Carlow Memories to connect her father, long living in Southampton, England, to home. She did this because last year, for one of the first summers since he emigrated, he was unable to visit the boyhood locality he left in 1944.
Since then she has posted more than 100 photographs her father took during visits in the 1960s around counties Carlow, Laois and Kildare. The page has gained more than 3,000 followers.
The photos taken by this long-departed emigrant have stirred the memories and “likes” of the more recent generation, as Flooks has received messages from Irish emigrants in Mexico and Australia.
Among the images are intimate portraits of towns and villages standing still in time from Carlow and its surrounds: the last thatched house in Ballylinan; Bambrick’s shop in Moneenroe; the church at Killeshin; the view of the sugar factory from Rossmore; a horse and trap in Graiguecullen; an overgrown playground at theArles national school; and two women looking out a half-door at Meeting Lane in Athy.

Emigrated

Muldowney, who celebrates his 92nd birthday today, emigrated to England during the second World War when British Rail came to Carlow offering free passage to Irish workers for the railways. He settled in Southampton, married and had three children, and lives there to this day. But his “heart has always been in Ireland”, Flooks says.
He began taking the photographs on his annual visits from 1967 of places and things that reminded him of what he was doing “when very innocent”, he says.
“I really enjoyed my youth in Ireland. They were the happiest years of my life. We were poor but very happy. I expected nothing and did not get very much,” he says of his childhood as part of a family of nine in Ballinagore near Ballickmoyler and Arles, Co Laois.
He also took them as solace for his parents, who followed their children and emigrated to England in 1956. “They were quite lonely for Ireland . . . They had a difficult life in every way and didn’t cope well with old age.”
When he returned with the photographs that first summer his parents were “astonished”. “My mother cried,” he recalls.
After the railways, Muldowney began working at electrical retailer Currys, where he manned the camera counter and received some training in photography. When he first brought his camera to Ireland and returned armed with shots of Arles and Ballylinan his colleagues were taken aback by the clarity of the photographs – the lack of air pollution in Ireland made everything look “as clear as crystal”, he says.
The uniqueness of his photographs is heightened because few good-quality cameras were in the hands of amateurs in Ireland at the time. One summer he took a super-8mm movie camera home. “People looked at me as if I was from Radio Éireann or the BBC,” he says.

‘Overwhelmed’

The father and daughter have been “absolutely overwhelmed” by comments and messages about the photographs on Facebook from people from the locality in Ireland or recent and long-departed emigrants from the area.
Flooks was going to put one of her father’s stories and memories with each photo but decided “if people comment it becomes their story”. And so it has happened as people have added their layers of memory.
“I never dreamed that people would find them that interesting, this interest now – I can’t explain,” says Muldowney.
He has hundreds of photos of the locality and has even been offered a possible book deal as a result of the Facebook page.
“It is something about the past that is more mysterious now because of the way the world is at the moment,” he says. “You look at a photo and you think, ‘Didn’t it look perfect back then?’”

Risk of super-volcano eruption big enough to ‘affect the world’

FAR GREATER THAN THOUGHT SAY SCIENTISTS

  

Scientists have analysed the molten rock within the dormant supervolcano beneath Yellowstone National Park and found that eruption is possible without any external trigger

The eruption of a “supervolcano” hundreds of times more powerful than conventional volcanoes – with the potential to wipe out civilisation as we know it – is more likely than previously thought, a study has found.
An analysis of the molten rock within the dormant supervolcano beneath Yellowstone National Park in the United States has revealed that an eruption is possible without any external trigger, scientists said.
Scientists previously believed many supervolcanic eruptions needed earthquakes to break open the Earth’s crust so magma could escape. But new research suggests that this can happen as a result of the build-up of pressure.
Supervolcanoes represent the second most globally cataclysmic event – next to an asteroid strike – and they have been responsible in the past for mass extinctions, long-term changes to the climate and shorter-term “volcanic winters” caused  by volcanic ash cutting out the sunlight.
The last known supervolcanic eruption was believed to have occurred about 70,000 years ago at the site today of Lake Toba in Sumatra, Indonesia. It caused a volcanic winter that blocked out the sun for between six to eight years, and resulted in a period of global cooling lasting a thousand years.
A supervolcano under Yellowstone Park in Wyoming last erupted about 600,000 years ago, sending more than 1,000 cubic kilometres of ash and lava into the atmosphere – about 100 times more than the Mount Pinatubo eruption in the Philippines in 1982, which caused a noticeable period of global cooling.
Following Pinatubo’s eruption, the global average temperature fell by about 0.4C for several months. Scientists predict that a supervolcanic eruption would cause average global temperatures to fall by about 10C for a decade – changing life on earth.
Scientists have analysed magma from the Yellowstone caldera, a 55-mile-wide underground cavern containing between 200 and 600 cubic kilometres of molten rock, to see how it responds to changes in pressure and temperature.
Using a powerful X-ray source at the European Synchrotron Radiation Facility in Grenoble, France, the researchers found that the density of the magma decreased significantly at the high temperatures and pressures experienced underground.
Density variations between magma and the rock surrounding it means that the lava within the supervolcano’s caldera can produce big enough forces to break through the earth’s crust, allowing the molten rock and ash to erupt from the surface, the scientists said.
“The difference in density between the molten magma in the caldera and the surrounding rock is big enough to drive the magma from the chamber to the surface,” said Jean-Philippe Perrillat of the National Centre for Scientific Research in Grenoble.
“The effect is like the extra buoyancy of a football when it is filled with air underwater, which forces it to the surface because of the denser water around it,” Dr Perrillat said.
“If the volume of magma is big enough, it should come to the surface and explode like a champagne bottle being uncorked.”
The study, published in the journal Nature Geoscience, was possible because the X-ray machine at Grenoble was able to take accurate density measurements at temperatures of up to 1,700C and pressures 36,000 times greater than normal atmospheric pressure.
“The results reveal that if the magma chamber is big enough, the overpressure caused by differences in density alone are sufficient to penetrate the crust above and initiate an eruption,” said Professor Carmen Sanchez-Valle of the Swiss Federal Institute of Technology (ETH) in Zurich, who led the study.
Preventing a supervolcanic eruption is not possible, but scientists are currently trying to devise methods of monitoring the pressure of underground magma in order to predict whether one is imminent.
Dr Perrillat said there are no known supervolcanoes that are in danger of erupting in the foreseeable future, and it would take at least a decade or so for the magma pressure within a caldera to build up to a point where an eruption is likely.