Over a thousand miles from the surface, in Earth’s D” layer—right on the edge of the liquid metal outer core—there is a weird ...

There are three types of seismic waves – P waves, S waves and surface waves. P waves are longitudinal waves, and their relative speed is faster than other waves.

A phase change in post-perovskite materials at the so-called D” discontinuity is also evidence for long-predicted slow, convective flows in the mantle itself ...

SEIS was the first ever seismometer to operate on Mars, and it was sensitive to three different types of seismic wave emanating from marsquakes. These were: P-waves, ...

Peering between three and eight kilometers underground, the team recorded S waves as slow as about 2.1 kilometers per second, occurring near the center of Yellowstone’s caldera.

Scientists have known that seismic waves slow down when passing through ultra-low velocity zones, or ULVZs, but only knew they existed around hotspots that create volcanic island chains. Now, a ...

In the early days of Mars, between 4 billion and 3.1 billion years ago, there was a lot of liquid water on Mars – enough to cover the entire planet with an ocean 700 to 900 meters deep.

Seismic body waves, which travel through the planet’s interior during a quake, have so far provided insights into Mars’s core and mantle, but have revealed little about the crust away from the ...