Xkcd: 26-Second Pulse
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But the 26 second pulse from Cameroon was the so called "footquake" from football fans stomping down.
> Euler wandered into the field of seismic noise in 2007 when he found consistent spikes in noise from one of 32 different seismic stations in Cameroon. The spikes turned out to correspond with joyous, celebratory foot-stomping of Cameroon’s avid soccer fans at various cities after goals were scored or key plays made during the African Cup of Nations games in 2006.
https://phys.org/news/2011-01-seismometer-noise-south-atlant...
Google is becoming worthless for 'serious' search queries. :(
https://phys.org/news/2011-01-seismometer-noise-south-atlant...
https://www.explainxkcd.com/wiki/index.php/2344:_26-Second_P...