Vector field modeling of seismic soil movement in building footing

Longitudinal P-wave being non-vortex causes high-frequency soils movement with small amplitudes, not resulting in a significant building damage;

Transverse S-wave being vortex causes soil volume expansion and rotation, defining main earthquake power, resulting in significant damages for buildings;

Surface L-wave of vortex character with lowphase spreading velocity but sufficient enough for damages with soil oscillative power.