This resource describes the two different types of seismic waves and how they travel through the earth, offers diagrams of the waves, their speeds, and how seismograms are used to locate earthquakes.

Earthquakes create seismic waves that travel through the Earth. By analyzing these seismic waves, seismologists can explore the Earth's deep interior. This fact sheet uses data from the 1994 magnitude 6.9 earthquake near Northridge,...

Using a technique called seismic tomography, scientists decoded the information contained in seismograms' squiggles to develop this image of an individual slice through the deep Earth.