The S wave shadow zone is the area of the Earth’s surface where S waves are not detected following an earthquake. This shadow zone has led geologists to a model of the Earth with a solid mantle ...

By tracking seismic waves from earthquakes that have passed ... emerged in unexpected places — a “shadow zone,” as Lehmann ...

A team of geophysicists created a detailed model of Earth's lower mantle using earthquake waves. This indicates the presence of zones of rocks that are colder, or have a different composition ...

There are a number of ways to measure the magnitude of an earthquake. Most scales are based on the amplitude of seismic waves recorded on seismometers ... earthquake occurred along the subduction zone ...

The study of seismic waves provides evidence for the internal ... Refractions between layers cause two shadow zones, where no P waves are detected – the size and positions of these shadow ...

no destructive waves materialized, according to officials. The quake serves as a reminder of the long-term seismic risks posed by the Cascadia Subduction Zone, a less-publicized but potentially ...