An earthquake hit Tokyo and 3 or 4 nuclear reactors went off and there was a tsunami.
Because it was damaged by an earthquake and tsunami.
The earthquake slightly damaged Tokyo, and the tsunami only hit the north Japan area.
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About 381,000 of the more than 694,000 houses were damaged or destroyed.
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During the earthquake in Japan, a tsunami was created, thousands of homes were destroyed, and one of the nuclear power plants was badly damaged, spreading its radioactivity.
Japan was very close to the epicenter of the earthquake; many of their buildings were damaged by the earthquake itself. Parts of the coast line were depressed and indented. Japan is an island nation, and much of the country is at or below sea level anyway. Because of this, the tsunami was able flood farther inland and because of the land features that were altered by the earthquake, the water did not recede.
It caused alot of damage to Japan, especially since it damaged a nuclear reactor that spread radiaton all around the world.
It damaged their houses, buildings, and everything.
In Japan there are huge earthquake zone.
That will vary, depending on the strength of the earthquake, and in general, what exactly gets damaged.
The magnitude of an earthquake is a number used to quantify how much energy was released during the earthquake. The earthquake in Japan that occurred on Friday, March 10, 2011, had a moment magnitude of 8.9.