Earthquake - a natural phenomenon resulting from the sudden release of energy from the Earth's crust, creating seismic waves which cause shaking and vibrations at the Earth's surface
Moment Magnitude scale - introduced in 1979 as a successor to the Richter Scale, used to compare the energies released by different earthquakes
Richter Scale - the most common scale of magnitude measurement used for earthquakes
Tsunami - a series of waves caused by the rapid displacement of a body of water, such as an ocean. Can be caused by: earthquakes, volcanic eruptions, landslides, large meteroid/asteroid impacts, and more
