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Tsunami source of the 2011 off the Pacific coast of Tohoku Earthquake

Earth, Planets and Space

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Natural disasters · 11 March 2011
The 2011 Tōhoku Earthquake and Tsunami

Pacific coast of Tōhoku, northeastern Honshu · Japan

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Why editors use it here
Peer-reviewed reconstruction of the earthquake's tsunami source using coastal and ocean-bottom observations.
1. Quick read
  A magnitude 9.1 megathrust earthquake off northeastern Honshu generated a tsunami that reached the coast within about 30 minutes.
  Reviewed 24 July 2026
2. Trigger and conditions
  A huge area of the plate boundary east of Honshu ruptured, displacing the seafloor.
  Reviewed 24 July 2026
3. Uncertainty
  Official casualty totals change as missing-person cases are resolved and agencies use different reporting dates.
  Reviewed 24 July 2026
4. Why it matters
  Tōhoku shows both the life-saving value and the limits of preparedness.
  Reviewed 24 July 2026