A DEQNA ethernet controller card can measure to an accuracy of 100ns which is around 20m at the speed of light. Shockwave velocities in the ground are in the order of 1000 to 10000 m/s or 1 to 10 m/ms so sampling at 1ms intervals should be precise enough.
In fact here is a graph produced by CORRTEX https://digital.library.unt.edu/ark:/67531/metadc1200655/m1/... which shows a velocity of ~3 m/ms or 3000 m/s. The sepcialised equipment has much better resolution and samples much faster than every millisecond.
In fact here is a graph produced by CORRTEX https://digital.library.unt.edu/ark:/67531/metadc1200655/m1/... which shows a velocity of ~3 m/ms or 3000 m/s. The sepcialised equipment has much better resolution and samples much faster than every millisecond.