Earlier first arrivals, for example in the Seattle fault zone, indicate that the rocks beneath the source and/or receiver have a higher P wave velocity, allowing the signal to travel more quickly.

Click here to enlarge image Rock density affects seismic-wave velocity; therefore, both the S and P-waves have higher velocities in denser rock. Denser rock indicates higher rock compaction ...

Researchers have mathematically elucidated how the presence of crystals and gas bubbles in magma affects the propagation of seismic P-waves. A novel equation was derived to describe the travel of ...

Mysterious zones in the deep mantle where earthquake waves slow to ... knew that ultra-low velocity zones (ULVZs), hover near hotspots — regions of the mantle where hot rock moves upward ...

The Nature of Waves Properties of waves are introduced as we explore the wave velocity equation by finding the frequency and wavelength of different types of waves. Simple harmonic motion is ...