2011 Tōhoku earthquake and tsunami, Earthquake in Japan
The 2011 Tōhoku earthquake and tsunami was a 9.0-magnitude earthquake followed by tsunami waves and a nuclear accident.
It was the most powerful earthquake ever recorded to have hit Japan, and the fourth most powerful earthquake in the world since modern record-keeping began in 1900.
The event triggered a global outpouring of empathy and solidarity with Japan.
Tsunami warning systems and construction standards were improved after the disaster.
The disaster led to a nationwide emphasis on disaster preparedness, known as the 'Self-Help and Mutual Aid' principle.
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