Body wave are waves that travel from the interior of the Earth toward the surface,
they are compose by two kind of waves P waves and and S waves
“P” Waves, also called Primary Waves have elastic traveling characteristics as sound
waves, they can travel in gas, liquid or solids like on earth, These waves are the
first to be detected by seismographs and alarms. These are compression waves classified
as body waves, these waves travel from the inner Earth to the surface.
“S” Wave also called Secondary Waves travel with amplitude perpendicular to their
propagation direction, as showed in the picture, these are classified as body waves,
they also travel from the earthquake epicenter toward the surface, these waves are
more destructive than the primary waves but fortunately travel at lower speed.
Surface wave are waves that travel near or at the surface of the earth on a horizontal
path, waves in this category are Love and Raleigh waves.
Love waves are surface waves with a transversal and longitudinal component that travel
horizontally to the Earth surface, are produced by the circular motion of particles
on a clockwise direction. The particles do not travel, they do communicate the energy
in circular motion generating the waves as seen on water and liquids.
Raleigh waves are also surface waves in solids with transversal and longitudinal
components in which the wave is produced by an counter-clockwiseelliptic movement
of the particles, as opposite to the circular clockwise motion in the love waves,
these waves are highly destructive.