Here, we make the characters move from side to side. Motion
is parallel to the direction of wave propagation. These are like primary
or compressional waves which move through the depths of the Earth when
Secondary Waves from WaveText
Here, we make the characters move up and down, with each
character one-eighth of a phase behind the previous one. The motion is
perpendicular to the direction of wave propagation. These are like secondary
or shear waves which, like primary waves, propagate through the Earth
after they are generated by earthquakes.
Ocean Waves from WaveText
Here, we make the characters move in circles with the
with the upper component of the motion in the same direction as that of
wave propagation. In this case, it is from left to right. These are like
ocean waves that are generated by wind blowing across the water.
In this invocation of the WaveText applet, the characters
rotate in circles, with the upper portion of the motion retrograde to
the direction of the wave propagation. This is the way the Earth's surface
moves in Rayleigh waves, which are surface waves created by earthquakes.