tokyophotog comments

Posted in: Japan hit by 6.9-magnitude earthquake See in context

Eigokun ... 6.9 is the magnitude. 3 refers to Shindo 3 on the Japanese scale which measurs quakes differently. Japanese scale measures relative strength of shaking at any given point. Magnitude measures amount of energy released at the epicenter. Had this magnitude 6.9 quake been 3 miles deep instead of 300 miles deep the outcome could have been tragic.

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