Don't worry, it was medicinal. Over on . The Tonight Show , Rachel Maddow stopped by to teach Jimmy Fallon how to make The Millionaire -- in honor of Donald Trump 's run for president. Best quote: I have to tell you, it is a terrible drink. It isn't tasty.
Seismic waves are waves produced by earthquakes. This occurs when rocks under the earth suddenly break or explode. There are two MAIN TYPES of seismic waves called body waves and surface waves. Body waves have the capacity to travel through the Earth's inner layers. They have a higher frequency and they are the ones that first occur under water at the onset of an earthquake.
Earthquake waves travel through the Earth in all directions from the focus. The waves moving away from the point where the rocks ruptured cause rock particles to expand and contract like the slinky in the picture. This type of earthquake wave causes rocks to compress and expand as the waves move through all parts of the Earth. Recording seismic waves. Primary waves, are the first to arrive at recording stations. S waves, also produced by all earthquakes arrive a short time after at recording stations.