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It's called the "Great Tokai Earthquake" - a predicted disaster southwest of Tokyo that Japan has spent trillions of yen preparing for, based on the inexact science of predicting earthquakes.
But Friday's 8.9-magnitude quake happened in a completely different subduction zone - where two oceanic plates collide. So is Japan still at risk for another great quake?
Since 1976, the quake-prone country has warned its citizens about the possibility of an 8.0 quake off the coast of Shizuoka prefecture, located about 100 miles (160 km) southeast of Tokyo. Friday's quake was centered offshore some 230 miles (373 km) northeast of Toyko.
The release of energy from Friday's event – which happened along the subduction zone between the Eurasian and North American plates - will have have no effect on alleviating the pressure building up between Eurasian and Philippine plates, where the Great Tokai quake is predicted to happen.
So after Japan picks up the pieces from this disaster, it will have to start preparing for what could be another one.