The displacement in these waves is parallel to the direction of travel.
Slotnick gave a formula for the velocity of these phenomena based on depth. They show a dip-dependent NMO velocity signature in VTI media. These phenomena can propagate in a liquid, so their shadow zone ends at 140 degrees. Unlike their counterparts, the speed of these phenomena depends on the bulk modulus. The displacement in these waves is parallel to the direction of travel. They are faster than their counterparts, meaning they arrive at the surface first, hence their name. For 10 points, name these seismic compression waves, the counterparts of S waves.
Slotnick gave a formula for the velocity of these phenomena based on depth.
{P} waves (prompt on sesmic waves or compression waves before mentioned)