leader when it comes to predicting tsunamis based on simulations," Inoue said.

According to Tatsuo Kuwayama, head of the Meteorological Agency's tsunami research section, 100,000 tsunami patterns have been calculated based on such things as magnitude and fault direction for earthquakes that could occur in the waters surrounding Japan

When an earthquake is detected at any of the 180 seismographic stations that operate around the clock nationwide, agency officials immediately check the database and calculate the estimated dimensions and arrival time of tsunamis, Kuwayama said.

"Our objective is to issue tsunami information within three minutes after an earthquake occurs," he said.