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The biggest tremors in notable times have been of
greatness marginally more than 9, albeit there is no
restriction to the conceivable extent. The latest substantial
tremor of extent 9.0 or bigger was a 9.0 greatness quake in
Japan in 2011 and it was the biggest Japanese tremor since
records started.
Force of shaking is measured on the changed Mercalli scale.
The shallower a seismic tremor, the more harm to
structures it causes, all else being equivalent.