CTBTO staff members David Brown and Pierrick Mialle have contributed to a scientific study published in Nature magazine. They analysed the asteroid which entered the atmosphere over Chelyabinsk, Russia, in February. The study is based in part on infrasound recordings from the International Monitoring System (IMS), which monitors underground, under water and the atmosphere for any sign of nuclear explosions.
Excerpt: “We performed a global survey of airbursts of a kiloton or more (including Chelyabinsk), and find that the number of impactors with diameters of tens of metres may be an order of magnitude higher than estimates based on other techniques.”
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