To continue the posts about making the seismic wave generator. See the previous post about water jet cutting the steel plates.
From what I am told, the generator is positioned, pinned to the ground, and hit on the ends with a sledge hammer. Instruments pick up and measure the seismic waves in order to analyse what is beneath.
Sound is not required. In fact sound is annoying and a disadvantage.
The operator stands on the generator while swinging the hammer.
So here is the finished item, ready to be delivered. It weighs 20kg.
It will be interesting to hear how it performs.