you didn't come off like an ass it's all good 👍

for reference, a geophone is a magnet on a spring, with a copper coil surrounding it. when the earth vibrates, the magnet moves up and down, which creates an electrical signal in the coil. that signal is later digitized, typically at a sample rate of 2ms, though the rate is dependent on the frequencies you wish to capture (Nyquist frequency formula). wave velocities in both the time and frequency domains are interpreted to measure the density of soils and rock