I’m no expert but I think it has to do with this effect: https://en.wikipedia.org/wiki/Vortex-induced_vibration https://en.wikipedia.org/wiki/Vortex-induced_vib

I’m no expert but I think it has to do with this effect: https://en.wikipedia.org/wiki/Vortex-induced_vibration https://en.wikipedia.org/wiki/Vortex-induced_vibration See also: https://en.wikipedia.org/wiki/Aeolian_harp https://en.wikipedia.org/wiki/Aeolian_harp Edit: might be a completely different kind of oscillation than I was thinking of. https://news.sky.com/story/spain-portugal-power-outage-latest-large-parts-of-countries-affected-with-traffic-lights-not-working-and-phone-lines-down-13357538?postid=9504891#liveblog-body https://news.sky.com/story/spain-portugal-power-outage-lates... So I would also like to understand how this works :)