An earthquake (also known as a quake ,tremor or temblor) is the result
of a sudden release of energy in the Earth's crust that creates seismic
waves. The seismicity, seismism or seismic activity of an area refers to
the frequency, type and size of earthquakes experienced over a period
of time. Earthquakes are measured using observations from seismometers.
The moment magnitude is the most common scale on which earthquakes
larger than approximately 5 are reported for the entire globe. The more
numerous earthquakes smaller than magnitude 5 reported by national
seismological observatories are measured mostly on the local magnitude
scale, also referred to as the Richter scale.
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