Washington: There may be a significant increase in the numbers of devastating
earthquakes around the world in 2018, warn scientists who have found
that variations in the speed of the Earth’s rotation may trigger intense
seismic activity.
Although fluctuations in rotation are small and may only change the
length of a day by one millisecond, they could lead to the release of
vast amounts of underground energy, researchers said.
“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,” said Roger Bilham of the University of
Colorado in the US.
Researchers looked at earthquakes of magnitude seven and greater that had occurred since 1900.
They found five periods when there had been significantly higher
numbers of large earthquakes compared with other times, ‘The Guardian’
reported.
They discovered that when Earth’s rotation decreased slightly, it
was followed by periods of increased numbers of intense earthquakes.
“The rotation of the Earth does change slightly – by a millisecond a
day sometimes – and that can be measured very accurately by atomic
clocks,” said Bilham.
Researchers found that there had been periods of around five years
when Earth’s rotation slowed by such an amount several times over the
past century and a half.
Crucially, these periods were followed by periods when the numbers of intense earthquakes increased.
“The Earth is offering us a five-year heads-up on future earthquakes,” said Bilham. PTI
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