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Edition 1
The 2011 Tōhoku Earthquake and Tsunami · 14 July 2026
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Initial edition
The 2011 Tōhoku Earthquake and Tsunami
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A magnitude 9.1 megathrust earthquake off northeastern Honshu generated a tsunami that reached the coast within about 30 minutes. The water overtopped defenses, destroyed communities, and caused more than 18,000 deaths and missing persons. Flooding disabled power and cooling at Fukushima Daiichi, leading to a major nuclear accident.
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11 March 2011
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Pacific coast of Tōhoku, northeastern Honshu
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Japan had extensive earthquake-resistant construction, coastal defenses, public drills, and one of the world’s most advanced warning systems. Historical deposits showed that very large tsunamis had reached the region, but assumptions used for some defenses and emergency plans underestimated the 2011 event.
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A huge area of the plate boundary east of Honshu ruptured, displacing the seafloor. The resulting tsunami crossed the Pacific and grew dramatically in shallow coastal water. Along parts of Tōhoku it reached heights approaching 40 meters.
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Search, rescue, shelter, and recovery unfolded amid destroyed transport and utilities, winter conditions, displacement, and the Fukushima emergency. Communities faced the loss of residents, homes, records, workplaces, and familiar coastlines.
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Japan revised tsunami assumptions, evacuation planning, coastal engineering, and nuclear regulation. Globally, observations from deep-ocean sensors improved real-time forecasting. Recovery and memorialization continue, with difficult debates over relocation, seawalls, energy, and community continuity.
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Tōhoku shows both the life-saving value and the limits of preparedness. It connects geologic history, warning systems, land-use choices, critical infrastructure, community memory, and cascading technological risk across an entire coastline.
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Memorial parks, preserved ruins, raised settlements, new defenses, evacuation markers, museums, and annual observances reshape the coast. The Fukushima Daiichi site remains in a long decommissioning process.
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Official casualty totals change as missing-person cases are resolved and agencies use different reporting dates. Wave height also varies sharply by location; a single maximum should not be treated as typical for the whole coast.
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Chaos Tourist editorial demonstration
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On This Day: 2011 Tohoku Earthquake and Tsunami
Tsunami Historical Series: Japan — 2011
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