Wymondley Posted March 13 Report Share Posted March 13 Underground pipelines? There's a network of pipes that pump fuel/oil between refinery's and storage depots (UKOP). Sewage and waste water storage tanks for holding excess capacity, they get pumped back out into the system when it can cope. Those could have pumps running on and off at various times. Quote Link to comment Share on other sites More sharing options...
discobob Posted March 13 Report Share Posted March 13 https://en.m.wikipedia.org/wiki/Infrasound Quote Link to comment Share on other sites More sharing options...
discobob Posted March 13 Report Share Posted March 13 This was on my YouTube Quote Link to comment Share on other sites More sharing options...
Penelope Posted March 14 Report Share Posted March 14 21 hours ago, ditchman said: if the ground was dry it would mean that sound waves would be travelling thro part air part ground...and so the dryness would have a "slowing" of the velocity of the wave sort of acting as a supressor.... now if those pore spaces are full of water the ground would be more dense and the particle velocity would be faster..... so to answer your question ..if the ground is wet the sound/vibration would be higher/more noticable Makes perfect sense, and as I suspected. Thanks, Ditchy. Quote Link to comment Share on other sites More sharing options...
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