The shock wave from an
asteroid that burned up over Russia in February was so powerful that it
travelled twice around the globe, scientists say.
They used a system of sensors set up to detect evidence of
nuclear tests and said it was the most powerful event ever recorded by
the network.
More than 1,000 people were injured when a 17m, 10,000-tonne space rock burned up above Chelyabinsk.
The study appears in the journal Geophysical Research Letters.
The researchers studied data from the International
Monitoring System (IMS) network operated by the Comprehensive
Nuclear-Test-Ban Treaty Organisation (CTBTO).
The detection stations look out for ultra-low frequency
acoustic waves, known as infrasound, that could come from nuclear test
explosions. But the system can also detect large blasts from other
sources, such as the Chelyabinsk fireball.
For the rest of the story: http://www.bbc.co.uk/news/science-environment-23066055
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