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Russian meteor blast 'heard' around the world

  • infrasound_waveform.jpg

    The Russian meteor blast send infrasound, or low-frequency sound waves, through the atmosphere.isoundhunter

  • infrasound_station_map.jpg

    Eleven infrasound stations around the world recorded the meteor blast above Russian on Friday.Comprehensive Nuclear Test Ban Treaty Organization

  • Russia Meteor streaks through sky 2013

    Feb. 15, 2013: In this frame grab made from a dashboard video camera, a meteorite contrail is seen streaking across the sky.AP2013

  • Russia Meteorite 2013 8.jpg

    Feb. 15, 2013: A meteorite contrail is seen over Chelyabinsk. A meteor streaked across the sky of Russias Ural Mountains on Friday morning, causing sharp explosions and reportedly injuring around 100 people, including many hurt by broken glass.AP Photo/Chelyabinsk.ru

The shock wave from Friday's meteor explosion above Russia sent subsonic waves through the atmosphere halfway around the world.

Up to 11 sensors in Greenland, Africa, Russia's Kamchatka Peninsula and other far-flung regions detected the Russian meteor blast's infrasound, or low-frequency sound waves. The sensors are part of the global network of 60 infrasound stations maintained by the Comprehensive Nuclear Test Ban Treaty Organization (CTBTO).

Infrasound's long wavelengths (about 20 to 0.01 Hertz) can travel far distances in the atmosphere, at frequencies humans can't hear. Elephants, whales and even pigeons use infrasound for communication and navigation, scientists have discovered.

The CTBTO relies on Infrasound arrays to help determine the location and size of atmospheric explosions. Man-made explosions, such as bombs, produce a different infrasound pattern than natural fireballs like shattering meteors.

Based on scrutiny of infrasound records, NASA scientists concluded the fireball released about 300 kilotons of energy, said Bill Cooke, lead for the Meteoroid Environments Office at NASA’s Marshall Space Flight Center in Huntsville, Ala.

That's about 20 to 25 times more powerful than the atomic bombs dropped in World War II, but still smaller than Siberia's Tunguska meteor explosion in 1908, which released 10 to 15 megatons of energy (equivalent to the Castle Bravo device, the most powerful atomic bomb tested by the United States).

"This was a moderate explosion," said Paul Chodas, research scientist in the Near Earth Object Program Office at the Jet Propulsion Laboratory in Pasadena, Calif.

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