Аннотация
The moment magnitude (Mw) = 9.0 2011 Tohoku-Oki megathrust earthquake
occurred off the coast of northeastern Japan. Combining Global Positioning
System (GPS) and acoustic data, we detected very large seafloor movements
associated with this event directly above the focal region. An area
with more than 20 meters of horizontal displacement--that is, four
times larger than those detected on land--stretches several tens
of kilometers long along the trench; the largest amount reaches about
24 meters toward east-southeast just above the hypocenter. Furthermore,
nearly 3 meters of vertical uplift occurred, contrary to observed
terrestrial subsidence.
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