- Giant tsunamis, super volcanoes and earthquakes could
pose a greater threat than terrorism, scientists claim.
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- Global Geophysical Events, or "Gee Gee's",
as they are nick-named, are not being taken seriously enough, they say.
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- The global community needs to monitor these risks, and
develop strategies to cope in the face of a catastrophe.
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- However, we are making good progress in reducing the
threat of asteroid impacts, the researchers said during a briefing at the
Royal Institution, UK.
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- Battening down
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- Since 9/11 we have become acutely aware of the threat
of terrorism. Governments worldwide are battening down the hatches and
ratcheting up the security.
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- But, in terms of grave threats, are we really looking
in the right direction?
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- Giant walls of water that can devastate coastal cities,
volcanoes so big that their ash crushes houses 1,500km (932 miles) away,
giant earthquakes and asteroid impacts. These are very rare events and,
if we are lucky, nothing like them will happen in our lifetimes.
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- But in the longer term, Gee Gee's may be our undoing
if we do not take action. According to researchers, careful preparation
could potentially save thousands of lives.
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- "In any one year the chances of one of these things
happening is probably much less than 1%," said Bill McGuire, director
of the Benfield Grieg Hazard Research Centre. "But in the longer term
it is 100%.
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- "We need to raise awareness, identify threats and
improve surveillance.
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- "We need to plan what we will do if these things
happen."
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- Super eruption
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- Volcanoes and earthquakes are relatively common occurrences,
but Gee Gee's are on an altogether different scale.
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- The last "super volcanic eruption" was back
in April 1815, when Tambora in Indonesia exploded violently, in what was
the largest eruption in historic time.
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- The eruption column reached a height of about 44 km (28
miles), ash fell as far as 1,300 km (800 miles) from the volcano - and
an estimated 92,000 people were killed.
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- Rare though they are, events this catastrophic need to
be taken very seriously.
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- The potential threat that scientists currently have their
eye on is an insecure rock - the size of the Isle of Man - in the Canary
Island of La Palma.
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- The rock is in the process of slipping into the sea and
Professor McGuire fears that when it finally collapses, the resulting tsunami
will cause massive destruction along the coasts of countries like the USA,
UK and many on the African continent, within a matter of hours.
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- "Eventually the whole rock will collapse into the
water, and the collapse - when it happens - will devastate the Atlantic
margin," said Professor McGuire.
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- The triggering factor could be the eruption of the volcano
on La Palma, called Cumbre Vieja, which could feasibly blow "anytime",
according to Professor McGuire.
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- Many researchers working in the field of Gee Gee's would
like better monitoring of Cumbre Vieja, so that advance warning can be
given for the possible collapse of the rock.
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- "We need to be out there now looking at when an
eruption is likely to happen," said Professor McGuire. "Otherwise
there will be no time to evacuate major cities."
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- Cosmic threat
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- Global governments are not entirely ignoring the threat
of Gee Gee's, however.
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- The greatest danger to humanity comes from asteroids,
but work funded largely by the US government is swiftly tackling this threat.
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- The European Space Agency (Esa) and Nasa are planning
missions to test how the course of asteroids and comets can be altered
by an impact.
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- Esa's mission Don Quijote will send a spacecraft crashing
into the surface of a space rock to measure the effects. In 2005, Nasa's
Deep Impact will monitor the outcome of blowing a hole in comet Tempel
1.
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- Scientists hope this will help them learn how to destroy
or deflect an asteroid on a collision course with Earth.
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- According to Benny Peiser, of John Moores University,
UK, the threat of cosmic mega disasters will be essentially "abolished
within 30 years".
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- "A quiet and largely unnoticed technological revolution
is dramatically accelerating the rate at which near-Earth asteroids (NEAs)
are discovered," he said.
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- In 1995 we knew about 300 NEAs, today we know about 3000
- and within 20 years we could be aware of 90% of all nearby space rocks,
he says.
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- "For the first time in the history of evolution
we are closing this window of vulnerability."
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- © BBC MMIV http://news.bbc.co.uk/1/hi/sci/tech/3549812.stm
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