In fact, the Richter scale was replaced in the 1970s by other ... with German-American seismologist Beno Gutenberg — to measure the size of earthquakes occurring in southern California.

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 ...

The first earthquake took place just after at 3.03am and hit 2.2 on the Richter scale - the scale used to measure the ...

The first took place just after at 3.03am and hit 2.2 on the Richter scale - the scale used to measure the strength of ...

The largest earthquake ever recorded was in Chile in 1960, it measured 9.5 on the Richter scale.

Just as seismologists measure the size of an earthquake using the Richter scale, volcanologists use an eruption magnitude scale called the Volcanic Explosivity Index, or VEI to classify eruptions.