9 1923 Tokyo-Yokohama Sanriku Earthquake 8. Earthquake Magnitude Year Primary Impact Area Great East Japan Earthquake 9.
Primary Impact Area Great Kanto Earthquake
The strongest earthquake in Japan recorded by modern instrumentation was the Great East Japan Earthquake, a magnitude 9. The rupture zone extended over 200 kilometers, with parts of the seafloor displacing vertically by more than 40 meters.
More than 18,000 people lost their lives, with many more missing and hundreds of thousands displaced from their homes. 9, caused widespread destruction in the Tokyo-Yokohama area.
Primary Impact Area Great Kanto Earthquake
Comparison to Historical Seismic Events While the 2011 event is the strongest in modern recorded history, Japan has experienced other devastating earthquakes. Coastal cities have constructed higher seawalls, and early warning systems for tsunamis have been upgraded significantly.
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