Tsunami
A tsunami is a tsunami caused by an earthquake. It is also called a tsunami. When a tsunami arrives at the shore, the seawater expedites quickly and the next tsunami recovers. In case of earthquake caused by vertical fault movement in a shallow place with a depth of less than 80km with a magnitude of 6.3 or more, there is a great possibility of a tsunami occurring. It is difficult to predict the occurrence of earthquakes with current technology, but it is possible to estimate the arrival time of tsunamis occurring in a long distance. For example, if an earthquake occurred in the northwest coast of Japan, it would begin to affect the East Sea of Korea after 1 hour to 1 hour and 30 minutes. Since it takes a considerable amount of time to find reliable evidence that a tsunami will occur after an earthquake, it is an international convention to issue a warning or warning when a shallow earthquake occurs above a certain level below sea level. The tsunami, which suffered the worst in the world, was built on December 26, 2004 in the Indian Ocean near Sumatra Island in Indonesia.