How might I characterize earth propogated vibrations from a railroad track? While the sound propogation is loud, the ground vibrates significantly at about 3 Hz. I would like to measure the earth mode and compare the results after abatement is applied.
I would like to measure the vibration at different distances to see natural attenuation. As the source is always different, I need to make multiple measurement simultaneously. I would like to collect the data for computer analysis. I have no analog input equipment for the computer interface. I would like to be able to bring a couple sensor arrays into the computer for spectrographic display and analysis.
I would appreciate all input.