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.
S waves and P waves are the two types of seismic waves produced by all earthquakes. P waves are primary waves because they arrive at seismic reporting stations first. These shear waves are secondary waves because they travel at slightly slower speeds and are the second set of seismic waves recorded on seismographs. Scientists use the difference in time to determine the earthquake focus and epicenter.