* Shear Motion: S waves cause a shearing motion within the rock. This means the rock particles are displaced perpendicular to the direction the wave is traveling. Imagine shaking a rope up and down - the wave travels along the rope, but the rope itself moves up and down, perpendicular to the direction of the wave.
* Particle Displacement: The displacement of rock particles due to S waves is a temporary deformation. Once the wave passes, the particles return to their original positions.
* Energy Transfer: S waves transfer energy through the rock as they propagate. This energy causes the particles to vibrate and interact with their neighbors.
* Attenuation: As S waves travel through the Earth, they lose energy through a process called attenuation. This happens because the wave interacts with the rock and the energy is converted into heat. S waves attenuate faster than P waves (primary waves).
* Speed and Behavior: The speed of S waves depends on the rigidity and density of the rock. S waves travel slower than P waves, and they cannot travel through liquids or gases. This is because liquids and gases lack the rigidity necessary for shear motion.
* Impact on Rock: The passage of S waves doesn't permanently alter the rock's composition. However, they can cause temporary changes in the rock's stress and strain, which can contribute to the accumulation of stress that eventually leads to earthquakes.
In summary: S waves cause a temporary, shearing motion within the rock, transferring energy and causing vibrations. They travel slower than P waves and cannot pass through liquids. While they don't permanently change the rock's composition, they play a role in the dynamics of the Earth's interior and can contribute to earthquake activity.
