The steady flow of vehicles is noisy enough as it is, but it also gives off a type of noise the human ear can’t hear: seismic noise, or the vibration of the ground. Thus, vibrations given off by cars, trucks, trains, and airplanes on the runway among…
Read more http://www.engadget.com/2014/11/01/seismic-noise-scripps/?ncid=rss_truncated
