Infrasonic waves from the meteor that broke up over Russia’s Ural mountains last week were the largest ever recorded by the CTBTO’s International Monitoring System.

Infrasound is low frequency sound with a range of less than 10 Hz.

The blast was detected by 17 infrasound stations in the CTBTO’s network, which tracks atomic blasts across the planet.  The furthest station to record the sub-audible sound was 15,000km away in Antarctica.

— CTBTO