In the mechanical classification of seismic waves generated by earthquakes, which of the following wave types travels fastest through the Earth interior and is capable of propagating through both solid and liquid rock media?

💡 Solution & Explanation

Primary waves are compressional body waves that travel at the highest velocity through geological strata, enabling seismograph stations to record them first during seismic events. They involve particle motion parallel to wave propagation and can pass through solids, liquids, and gases because fluids offer resistance to volume changes. Secondary waves are shear waves that cannot travel through fluids, which is why they are blocked by the liquid outer core of the Earth. Seismic wave velocities provide critical evidence regarding internal Earth layering.