The generation of tsunami needs to satisfy the following three conditions:
Because only the deep sea has a huge body of water. The seawater fluctuates
violently due to the dynamics of seismic waves, forming strong waves, advancing
forward and submerging the coastal areas one by one.
Large earthquakes, etc.
When an earthquake or volcanic eruption occurs at the bottom of the sea,
the strata on the bottom of the sea break, and part of the strata suddenly
rise or sink suddenly, resulting in violent "shaking" of the entire water
layer from the bottom of the sea to the surface. This "shaking" is quite different
from the usual waves. Waves generally fluctuate only near the sea surface, and the
depth involved is not large, the amplitude of the wave decays rapidly with the
depth of the water. The sea water "shaking" caused by the submarine earthquake is
the fluctuation of the whole water body from the bottom to the sea surface, so
the energy contained is amazing.
Open and gradually shallower coastal conditions
Tsunami occurs when a large number of seawater is suddenly displaced or transferred
due to crustal deformation caused by seabed earthquakes, etc. When the seabed is
suddenly distorted, the water level will be offset vertically and the tsunami will
occur. Tsunami occurs when a large number of seawater is suddenly displaced or
transferred due to crustal deformation caused by seabed earthquakes, etc., When the
seabed distorted suddenly, which shifts the water level vertically, causing a tsunami.
This is the case with deep-sea seabed earthquakes. When an earthquake occurs, the
crustal plates will squeeze or separate each other, so a large area of the seabed will
suddenly rise or fall, and the sea water in this area will suddenly rise or fall and
deviate from its equilibrium position. Under the influence of gravity, large quantities
of sea water will form waves, then tsunamis will form. Vertical motion of the seabed
caused by submarine earthquakes generally occurs at the boundary of the crustal plate.
At the bottom of the Pacific Ocean, the compression of thick Oceanic and continental
plates can cause tsunamis very easily.
The main factors inducing tsunami are: submarine earthquakes, volcanic eruptions,
landslides, celestial bodies falling, underwater explosions (nuclear explosions).