In the ranking of the largest tsunami in the world, the South China Sea tsunami in Japan occurred at 1707, which was caused by an earthquake of magnitude 8. It is understood that at that time, the waves were as high as 25 meters, which swept the entire Kyushu region of Japan and spread to many surrounding cities, killing at least 30,000 people.

Second, the Chilean tsunami.

The Chilean tsunami occurred on 1960. The whole tsunami was 2 1 m high and lasted for about three days. According to statistics, more than 25,000 people were killed and at least 2 million people were homeless, which directly caused huge economic losses.

Three. Gan Long tsunami

The Ganlong tsunami occurred in Ryukyu 177 1 Japan. It was also caused by an earthquake of magnitude 8. The wave height reached at least 80 meters, which eventually caused nearly 10,000 deaths and serious economic losses.

The reasons for the formation of the tsunami:

Tsunami is a catastrophic wave, usually caused by an undersea earthquake, with a focal point less than 50 kilometers below the seabed and a magnitude of 6.5 or above on the Richter scale. Underwater or coastal landslides or volcanic eruptions may also trigger tsunamis.

After an impact, the shock wave travels far away in an expanding circle on the sea surface, just like a pebble falling into a shallow pool. The tsunami wavelength is greater than the maximum depth of the ocean, and the orbital motion is not greatly hindered near the seabed. No matter how deep the ocean is, waves can travel through it.