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How deep below the Pacific Ocean did the 2011 Japan earthquake begin?
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Japan earthquake and tsunami of 2011
Aerial view of damage to a portion of the northeastern coast of Honshu, Japan, following the offshore earthquake and resultant tsunami there on March 11, 2011.
The 2011 Japan earthquake, which occurred in the western Pacific Ocean, had a focus located 18.6 miles (about 30 km) below the ocean floor.12