What are the causes of tsunamis? What are the main causes of tsunamis?

A tsunami is a wave of ocean that is highly destructive. Tsunamis can be caused by geodetic activities such as underwater**, volcanic eruptions, or underwater subsidence and landslides. **When it occurs, the seabed strata are fractured, and some strata rise or sink suddenly, resulting in a violent "shaking" of the entire water layer from the seabed to the surface of the sea.

This "jitter" is very different from the waves you usually see.

Waves generally only rise and fall near the surface of the sea, involving little depth, and the amplitude of the fluctuations decays quickly with the depth of the water. **The resulting "shaking" of the sea water is the fluctuation of the entire water body from the bottom of the sea to the surface of the sea, which contains an astonishing amount of energy. Tsunamis have a large wavelength and can travel thousands of kilometers with little energy loss.

After a single jolt, the ** wave travels a long distance in an ever-expanding circle on the surface of the sea, just like the wave produced by a pebble falling into a shallow pool.

The fluctuations caused by ** are different from the waves on the sea surface, which only fluctuate in the water layer at a certain depth, while the fluctuations caused by ** are the ups and downs of the entire water layer from the sea surface to the bottom of the sea. A destructive tsunami can only occur in the presence of vertical faults and magnitude on the Richter scale. The speed at which a tsunami travels is directly proportional to the depth of the water in which it travels.

In the Pacific, tsunamise generally travel at speeds ranging from 200,300 kilometres to 1,000 kilometres. Tsunamis do not cause damage in the deep oceans, and it is difficult for ships under sail to detect such fluctuations. When a tsunami occurs, it is often safer to be the more open the sea.

Once a tsunami enters the continental shelf, such waves can be devastating due to a sharp increase in wave height due to a sharp increase in depth.

Before the tsunami hit, why did the tide suddenly recede far from the beach, and the sea water returned after a while? In most cases, the phenomenon of sea level decline occurs because the trough of the tsunami shock wave reaches the coast first. The trough is the lower part of the wave, and if it makes landfall first, the sea level will fall.

At the same time, the tsunami shock wave is different from ordinary waves in that its wavelength is very large, so after the trough landfalls, the crest of the wave can only be reached at a considerable distance of time.

In addition, if this happened near the epicenter, it could be caused by another reason: ** when it happened, there was a large area of uplift and descent of the seafloor ground. At this time, the sea water in the sea near the ** area also rises and falls, and then a tsunami is formed.

In addition, submarine volcanic eruptions, landslides and man-made underwater nuclear explosions can also cause tsunamis, meteorite impacts can also cause tsunamis, and the tsunami "water wall" caused by meteorites can reach 100 feet, and can occur in any water, not necessarily in the ** zone. However, a tsunami caused by a meteorite may occur only once in a thousand years.

What causes the formation of a tsunami?

The vast majority of tsunamis are caused by the seabed, which is why tsunamis are also called tsunamis.

Of course, there are other causes of tsunamis:

Tsunamis are foul waves on the sea surface caused by geodetic activities such as underwater **, volcanic eruptions, underwater subsidence and landslides, accompanied by loud noises. It is a wave with great destructive power, the most powerful force of nature on the planet.

Tsunami causes: Tsunamis can be divided into four types. That is, storm surges caused by meteorological changes, volcanic tsunamis caused by volcanic eruptions, landslide tsunamis caused by submarine landslides, and tsunamis** caused by seabed **.

China ** Bureau - **Tsunami is a strong disturbance of seawater caused by the rapid rise and fall of seabed topography when the seabed occurs**. There are two forms of mechanism: "descending" tsunamis and "uplifting" tsunamis.

Descending type "tsunami": some tectonic ** causes a large area of sharp decline in the submarine crust, the sea water first swells to the space of sudden staggered subsidence, and there is a large-scale accumulation of seawater above it, when the inrushing seawater encounters resistance on the seabed, it turns back to the sea surface to produce compression waves, forming long waves and large waves, and propagating and spreading around, this descending type of tsunami formed by the movement of the submarine crust is the first to show abnormal low tide phenomenon on the coast. The 1960 Chile** tsunami was of this type.

Uplift "Tsunami": Some tectonic structures ** cause a large-scale sharp rise of the seafloor crust, and the seawater also rises with the uplift area, and there is a large-scale accumulation of seawater above the uplift area, under the action of gravity, the seawater must maintain an equipotential surface to achieve relative equilibrium, so the seawater spreads from the wave source area to the surroundings, forming a turbulent wave. The tsunami waves formed by the movement of the seafloor crust in this uplifted type first appear as an abnormal high tide phenomenon on the coast.

On May 26, 1983, the tsunami caused by the Sea of Central Japan 7 7** was of this type.

What causes the formation of a tsunami?

1: Long-term fluctuations in seawater caused by seabed **, volcanic eruptions, or huge rock collapses and landslides can cause large fluctuations in the nearshore sea surface. 2：

Powerful destructive waves caused by ocean floors** or volcanic eruptions. 3: Huge fluctuations in the water surface of the ocean and coastal waters caused by seabed **, crustal changes, volcanic eruptions, landslides, sea cores**, etc.

There are many reasons for the small cause, first of all, the first reason should be due to the ** crustal movement of the seabed.

Tsunamis are usually caused by ocean floors**, landslides, and volcanic eruptions.

Hi caused by the little things, because if the wind is very strong, the tsunami, the bigger.

What causes the formation of a tsunami?

Tsunamis are catastrophic waves, and there are about 260 destructive tsunamis recorded around the world, and they occur about once in about six or seven years on average, so do you know what causes tsunamis to form?

There are three main causes of tsunami formation: **, seamount collapses, and the impact of cosmic objects.

Often, ** is the main cause of tsunamis. When it occurs on the deep seabed or near the ocean, the movement of the earth's crust causes the deformation of the seabed plates, and the slippage between the plates, which causes a large amount of countercurrent in the seawater, and triggers the large-scale movement of the seawater, forming a tsunami.

Semont avalanches are caused by submarine volcanic eruptions, and sediments and rocks falling from landslides can also cause large-scale seawater movements, resulting in tsunamis.

Tsunamis induced by the influence of cosmic objects are the least common, and usually meteorites falling into the ocean will cause waves, and when the energy of the waves raised by the meteorite is strong enough, they can also cause tsunamis.

Usually, if there is an abnormal increase or decrease in the water near the shore, it is a sign that a tsunami is coming. In the event of a tsunami, people on the shore should move from low-lying areas to high-lying areas as soon as possible.

How is a tsunami formed? Why is it so powerful, the process is so shocking!