Seismologists and geophysicists often discuss the behavior of different types of seismic waves, including S-waves. As a subject matter expert in this field, I can provide you with an accurate explanation. S-waves, also known as shear waves, are unique in that they move particles perpendicular to the direction of the wave's propagation. This movement is only possible in mediums that can support shear stress, which is a type of stress that arises from forces parallel to the plane of interest. Solids have this property, allowing S-waves to travel through them. However, liquids do not support shear stress because their particles can move freely past one another, making it impossible for shear forces to be transmitted. Therefore, S-waves cannot propagate through liquids. read more >>

S-waves are shear waves, which move particles perpendicularly to their direction of propagation. They can propagate through solid rocks because these rocks have enough shear strength. ... Hence, S-waves do not propagate through liquids.read more >>