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Title : Swarms of big earthquakes are set to devastate Earth 2018
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Swarms of big earthquakes are set to devastate Earth 2018

• Slight fluctuations will release mammoth amounts of underground energy
• Next year we could have at least 20 serious earthquakes, scientists warn
• The most intense ones are expected to occur in tropical regions

By Phoebe Weston For Mailonline

Published: 03:57 EST, 20 November 2017 | Updated: 04:11 EST, 20 November 2017

Swarms of devastating earthquakes are set to arrive next year due to the slowing of Earth's rotation, scientists claim.

Experts warn we 'had it easy this year' with just six severe earthquakes.

Next year we could have at least 20 serious earthquakes and the most intense ones are expected to occur in tropical regions, home to around one billion people. 

Tiny changes in the speed of our planet's rotation will trigger huge seismic activity by releasing vast amounts of underground energy.  

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Swarms of devastating earthquakes are set to arrive next year due to the slowing of the Earth's rotation, scientists claim. A car lies crushed by debris from the 7.3-magnitude earthquake in the city of Sarpol-e-Zahab in western Iran

EARTHQUAKE SWARMS

Researchers found five periods in the past century when there were more earthquakes than other times.

On these five occasions, there was a 25 to 30 per cent increase in the number of earthquakes with a magnitude of 7 or above. 

These all coincided with a slowing in the rotation of the Earth, scientists found.

Experts do not know exactly why this happens but believe minuscule variations in rotation causes a shift in the shape of the Earth's iron and nickel 'inner core'.

This in turn changes the liquid outer core on which the Earth's tectonic plates rest.

The planet's rotation is slowing down because of tidal forces between Earth and the moon.  

The side of Earth closest to the moon feels its pull the strongest, while the side farthest from the moon feels its gravity less. 

That difference in gravitational pull stretches the Earth, which causes tidal bulges.

These bulges pull the moon closer or farther away from Earth by around 4cm per year.

The moon exerts the opposite force on them, pulling them back toward it, creating friction and slowing down the planet’s rotation.

The time the Earth takes to make a complete rotation on its axis varies by about a millionth of a second per day. 

While the rotational rate hasn't declined evenly,  the average day has grown longer by between 15 millionths and 25 millionths of a second every year.

Researchers from the University of Colorado in Boulder and the University of Montana say that even fluctuations of a millisecond could increase seismic activity.

'The correlation between Earth's rotation and earthquake activity is strong and suggests there is going to be an increase in numbers of intense earthquakes next year,' Dr Roger Bilham from the University of Colorado told the Observer. 

Experts, who presented their findings at the annual meeting of the Geological Society of America, do not know exactly why this happens but believe minuscule variations in rotation causes a shift in the shape of the Earth's iron and nickel 'inner core'.

This in turn changes the liquid outer core on which the Earth's tectonic plates rest.

'Next year, we should see a significant increase in the numbers of severe earthquakes. 

'We have had it easy this year. So far, we have only had about six severe earthquakes', he said.

Next year we could have at least 20 serious earthquakes and the most intense ones are expected to occur in tropical regions, home to around one billion people (stock image, search and rescue forces)

'We could easily have 20 a year starting in 2018.'

Researchers found five periods in the past century when there were more earthquakes than other times.

On these five occasions, there was a 25 to 30 per cent increase in the number of earthquakes with a magnitude of 7 or above. 

These all coincided with a slowing in the rotation of the Earth, scientists found.

Since 1990, more than 80 per cent of all magnitude 7 earthquakes on the eastern Caribbean plate boundary have occurred in the five years following a maximum deceleration.

During these periods there could be up to 30 intense earthquakes every year, while the rest of the time the average figure was around 15 quakes.

'The Earth is offering us a five-year heads-up on future earthquakes', said Dr Bilham, who said the Earth began a slowdown more than four years ago.

Researchers found delayed global seismic productivity is most pronounced at equatorial latitudes 10°N-30°S.

This research comes just after a 7.3-magnitude earthquake struck Iran, leaving at least 400 people killed and more than 6,000 injured.

The quake hit 19 miles southwest of Halabja in Iraqi Kurdistan at around 9.20pm on Sunday, when many people would have been at home. More than 100 aftershocks followed.

 

 

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