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