article_snippet: Scientists are listening in on earthquakes to create stunning marble-like simulations of Earth's interior.
article_snippet: researchers do this by analysing the speed of the tremors, which travel rapidly through solid rock and slowly through molten magma.
article_snippet: Computer simulations use the speed of seismic waves from earthquakes to reveal the existence of subterranean structures.
article_snippet: These stations make recordings, or seismograms, that detail the movement produced by seismic waves, which typically travel at speeds of several miles per second and last several minutes. '
article_snippet: A three-dimensional image showing contours of locations where seismic wave speeds are faster than average .
article_snippet: Previous research on this has only used three types of seismic waves: primary or compressional waves, secondary or shear waves, and surface waves.
article_snippet: This map shows relative variations in seismic shear wave speed at a depth of 241 miles (389 km).
highlights_snippet: Speed of tremors reveals what type of material is beneath the surface .
  