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 ...

Do we still use the Richter Scale to measure earthquakes? Magnitude is the most common measure of an earthquake. The magnitude is a measure of the source of the earthquake and its size.

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 ...

Discover interesting facts about how big earthquakes can get, why earthquakes happen, and why they're so hard to predict.

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