Motion Perpendicular to the ground is called horizontal motion.
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The earths surface, a building, and a moving object
Surface Waves can propagate only along the boundary of solid.Two types are:Rayliegh Waves propagate along boundary between two dissimilar solid media, in a plane perpendicular to the surface and containing the direction of propagation.Love Waves are polarized shear wave with an associated oscillatory particle motion parallel to the free space and perpendicular to the direction wave motion.
a transverse wave
the force that opposes the motion of two touching surfaces is velocity.
Earth's surface is a common reference point for detecting motion.