NATIONAL  ·   August 25, 2014

The earthquake magnitude scale, explained

- The seismic strength of every earthquake gets calculated based on a now universal magnitude scale. Here's where that scale came from and how it works. ()

- The seismic strength of every earthquake gets calculated based on a now universal magnitude scale. Here's where that scale came from and how it works. ()

The earthquake magnitude scale, explained (1:47)

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