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 Hzbr Seismic: oscillation waves in the earth, often caused by earthquakes or other tectonic activity. The CTBTO stations detect frequencies of 0.02-16 Hzbr br br Credits (and Twitter handles):br Script Writer: Alex Reichbr Script Editor: Kate Yoshida (@KateYoshida)br Video Illustrator: Jesse Agarbr 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 16xbr 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 16xbr br 1:01 Whale call Feb 18 2017, detected by hydroacoustic station. Sped up 16xbr br 1:08 Chelyabinsk meteor airburst February 15 2013, detected by infrasound station 650km away in Kazakhstan. Sped up 135xbr br 1:39 Earthquake Jan 2 2017, detected by infrasound station. Sped up 16xbr br 2:00 Sound with unknown cause, detected by hydroacoustic station. March 25 2017. Sped up 16xbr br br br Referencesbr 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 communicationbr br Harabalus, G. May 2017, personal communicationbr br LeBras, R. May 2017, personal communicationbr br Mialle P., May 2017, personal communicationbr br Miksis-Old, J. May 2017, personal communicationbr br Nielsen, P.