Correct Answer: Faster
Primary waves (P-waves) are the fastest type of seismic waves generated during an earthquake and are therefore the first to be detected by seismographs. They travel through solids, liquids, and gases by compressing and expanding the material in the direction of travel, which is why they are also known as compressional or longitudinal waves. In contrast, Secondary waves (S-waves) move only through solids and travel at a slower speed because they move particles perpendicular to the direction of wave propagation. The difference in arrival times between P-waves and S-waves helps scientists determine the location and magnitude of earthquakes. Studying these waves has also provided valuable information about the internal structure of the Earth, including the presence of the liquid outer core.
- Fastest Seismic Wave: P-wave.
- Also Called: Primary or Compressional wave.
- Travels Through: Solids, liquids, and gases.
- Importance: First wave detected during earthquakes.
- Correct Answer: Faster.