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.

Another scale is based on the physical size of the earthquake fault and the amount of slip that occurred. Then there are also measures of earthquake shaking intensity. The intensity from one ...

Earthquake Magnitude Scale Magnitude Earthquake Effects Estimated Number Each Year 2.5 or less Usually not felt, but can be recorded by seismograph. Millions 2.5 to 5.4 Often felt, but only causes ...

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.

The quake which measured 4.8 on the Richter scale - which measures how powerful a tremor is - was felt in Philadelphia, New Jersey and New York City at about 10:23am local time. Nobody has been ...