Previous earthquakes that rivalled the March 2011 Tohoku tremor in size may be recorded in sediment samples just recovered from the seafloor off Japan. A German-led scientific cruise obtained the cores from 16 different locations, some of them at a water depth of 7.5km. The sediments hint at three major disturbances on the ocean bed that could be the result of the submarine landslides often seen with big quakes.
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