Magnitude scales can be used to describe earthquakes so small that they are expressed in negative numbers. The scale also has no upper limit. Learn more about how we measure earthquake magnitude.

There are a number of ways to measure the magnitude of an earthquake. Most scales are based on the amplitude of seismic waves recorded on seismometers. These scales account for the distance between ...

(WHTM) – Residents along much of the East Coast felt shaking Friday morning as a 4.8 magnitude earthquake struck New Jersey. One of the most commonly known earthquake-measuring tools is the ...