How Does The Richter Scale Work?

Nepal has been hit by two huge earthquakes, a 7.8 and a 7.3 on the Richter Scale. What are the different ways seismologists measure earthquakes and what do these ratings mean?

Read More:
Earthquake Facts and Statistics
http://earthquake.usgs.gov/earthquake...

How Earthquakes Work
http://science.howstuffworks.com/natu...

The Modified Mercalli Intensity Scale
http://earthquake.usgs.gov/learn/topi...
"The effect of an earthquake on the Earth's surface is called the intensity. The intensity scale consists of a series of certain key responses such as people awakening, movement of furniture, damage to chimneys, and finally - total destruction."

Magnitude VS Intensity
http://pnsn.org/outreach/about-earthq...
"Perhaps no seismic subject is as irksome to seismologists as discussions of earthquake size. There often seems to be no end of confusion, misunderstanding, and over-interpretation of what are really pretty crude metrics."
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