Everything you wanted to know about earthquake magnitudes, but were too shaken to ask.

What is meant by an earthquake's magnitude?

How are Richter magnitudes calculated?

How can the energy release of an earthquake be computed from its magnitude?

Table of earthquake energy versus magnitude.

List of the ten largest earthquakes since 1900.

Then what is meant by the INTENSITY of an earthquake?

How can I report the intensity of the earthquake that I just felt?