Vibration
Vibration is just like sound in air, but travelling through solid matter, much faster, and in a variety of different wave forms. OK, not that similar then, but it is another area in which CSA can offer considerable expertise in prediction, measurement and assessment. The most common sources are trains (both over and under ground) demolition equipment and piling, but we have also looked at tunnel boring machines, running machines, quarry and mining noise, and even fracking.