Downhole seismic

Down-hole (DH) and cross-hole (SH) seismic methods involve measuring the time required for P and S waves to travel from seismic source, located at the ground surface or in drilling, to the receptors placed in another drill.

[@ingindamai4321]

Can we find the velocity of P and S waves for each layer from such the test like this?

[@andreysoeroso5358]

What is the maximum depth this test can perform??

[@kisfigi]

50-300meters depending on the attenuation of the soil