A monitoring system developed to listen for secret nuclear tests mostly hears other events happening all around Earth.
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If you want to learn more about this topic, start your googling with these keywords:
Infrasound: sound waves too low in frequency for humans to hear. The CTBTO stations detect frequencies of 0.02 to 4Hz
Hydroacoustic: having to do with underwater sounds. The CTBTO stations detect frequencies of 1-100 Hz
Seismic: oscillation waves in the earth, often caused by earthquakes or other tectonic activity. The CTBTO stations detect frequencies of 0.02-16 Hz
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Credits (and Twitter handles):
Script Writer: Alex Reich
Script Editor: Kate Yoshida (@KateYoshida)
Video Illustrator: Jesse Agar
Video Director: Kate Yoshida (@KateYoshida)
Video Narrator: Kate Yoshida (@KateYoshida)
With Contributions From: Henry Reich, Ever Salazar, Emily Elert, Peter Reich, David Goldenberg
Music by: Nathaniel Schroeder:
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If you liked this week’s video, we think you might also like:
Animals can detect infrasound:
A Time-Lapse Map of Every Nuclear Explosion Since 1945:
Sound travels 1000s of miles in the ocean’s SOFAR channel:
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Sounds in the video that were recorded by CTBTO stations:
0:32 Kasatoshi volcano eruption in August 2008, detected 2100km away at infrasound station on mainland Alaska. Sped up 500x
0:35 Explosion of Antares rocket in October 2014, detected 1100km away at Bermuda infrasound station. Sped up 150x and video:
0:37 Ship engine detected June 1 2017 by hydroacoustic station. Sped up 16x
0:40 Waves hitting an iceberg and causing it to vibrate like a cymbal in July 2010. Detected by hydroacoustic station off of Western Australia. Sped up 16x
1:01 Whale call Feb 18 2017, detected by hydroacoustic station. Sped up 16x
1:08 Chelyabinsk meteor airburst February 15 2013, detected by infrasound station 650km away in Kazakhstan. Sped up 135x
1:39 Earthquake Jan 2 2017, detected by infrasound station. Sped up 16x
2:00 Sound with unknown cause, detected by hydroacoustic station. March 25 2017. Sped up 16x
References
Brown, P. G., et al. 2013. A 500-kiloton airburst over Chelyabinsk and an enhanced hazard from small impactors. Nature, 503(7475), 238-241.
Graham, G. May 2017, Personal communication
Harabalus, G. May 2017, personal communication
LeBras, R. May 2017, personal communication
Mialle P., May 2017, personal communication
Miksis-Old, J. May 2017, personal communication
Nielsen, P., May 2017, personal communication
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