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The largest earthquake that occurred off the coast of Japan on March 11, 2011 was originally calculated as magnitude 8.9, but later changed to 9.0 independently by both USGS and Japanese seismologists.

The change to 9.0 means that the earthquake was about 1.5 times stronger than initially thought.

UPDATE: Official magnitude was updated to 9.1 on Nov 7, 2016.

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14y ago

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