But mysterious earthquake waves suggest that these features might be widespread. ULVZs, which are located in the lower mantle near the core-mantle boundary, can slow seismic waves by up to 50%.

These plates move slowly, but can cause earthquakes and volcanoes where they meet. The seismic waves produced by an earthquake are monitored and tracked. The Earth is almost a sphere. These are ...

The diagrams show what happens when P waves and ... It is the slowest of the three types of seismic wave. Surface waves usually have larger amplitude than the other waves and cause the most ...