Seismic refraction tomography: what it is, why it is done and how to interpret it (with Easy Refract + Tomo)
A seismic refraction survey interpreted with the classic methods gives a layered model: two or three refractors, each with its velocity and its depth below every geophone. That works well when the ground really is layered. But real ground has bedrock troughs, lenses of different material, weathering mantles that thicken, fractured zones along a fault.…