Tsunamis and floods, how are they formed?

One time. In terms of economic losses, the losses caused by floods are much greater than those caused by tsunamis.

A tsunami is a phenomenon caused by a storm or seabed** with loud noises. It is a kind of ocean wave with strong destructive power, because the movement of the earth's crust leads to the marine disaster caused by the eruption of submarine volcanoes, which is more harmful to the residents and facilities near the coast, etc., the damage range of the tsunami is limited, the damage time is limited, the destructive power is greater for the coastal area, and there is no destructive power for the area far away from the coast.

Flooding usually refers to the phenomenon of rapid increase in the amount of sea water or rapid water level in rivers and lakes caused by natural factors such as heavy rainfall, rapid melting of ice and snow, and storm surge. The water level contained in rivers, lakes, seas, and rivers **, the phenomenon of water flow exceeding the normal water level. Floods often threaten the lives and property of people along rivers, lakes and coastal areas, and even cause inundation disasters.

Since ancient times, floods have brought many disasters to human beings, such as the Yellow River and the lower reaches of the Ganges River, which often flooded and caused heavy losses.

Floods are claimed to be nature's number one killer. The destructive power is large, the area that flows through is more, and the coast will be affected, the damage is wide, the duration is long, and the destructive power is large.

Tsunamis and floods are more harmful, but from an economic point of view, water supply is the most harmful, but whether it is a tsunami or a flood, emergency measures need to be prepared.

A tsunami is a catastrophic wave that is usually caused by the ocean floor**, landslides, and volcanic eruptions. When the ** occurs, the epicenter is within 50 kilometers of the seabed, and the earthquake is above or above, the crust of the seabed is fractured, and some places subside, and some places rise, which causes strong vibrations and makes the sea surface rise and fall violently, forming ** waves. The waves expand in circles on the surface of the sea, spreading far away, hence the formation of a tsunami.

Tsunamis in the Pacific Rim accounted for about 80% of the total. The Japanese archipelago and its nearby waters account for about 60% of the tsunami in the Pacific Ocean, and Japan is the country that has suffered the most from the tsunami in the world.

When a tsunami occurs, the ** wave travels far away in an ever-expanding circle on the surface of the sea. At a high speed of 600-1,000 kilometers per hour, it gallops 10,000-20,000 kilometers on the unobstructed ocean, setting off 10-40 meters high waves that crash on the shore, engulfing everything that is affected. A few minutes later, the crest of the wave arrived, retreating and advancing, causing devastating damage.

Soon after the violent tremors, the waves roared, devastated and devastated the coastline, over the fields, and violently attacked the cities and villages on the shore, and in an instant people disappeared into the huge waves. All the facilities of the port, the buildings that were destroyed, were swept away by the stormy waves. In the aftermath, the beach was a mess, littered with broken wood and dead bodies.

Summary. Flood is a natural phenomenon caused by natural factors such as heavy rainfall, rapid melting of ice and snow, storm surge, etc., or the rapid increase in water level, and is a natural disaster. Objectively speaking, the frequent occurrence of floods has its irresistible reasons, and it can be said that the "mandate of heaven" cannot be violated.

However, why did the Yangtze River disappear in just 100 years in the 20th century? Why did a once-in-a-century flood become a once-in-a-few disaster? Once in 10 years?

Compared with historical data, the frequency and severity of floods are quite consistent with the trend of population growth. We have to admit that China's rapid population growth, the expansion of cultivated land, the reclamation of lakes and fields, indiscriminate deforestation and other man-made destruction have constantly changed the state of the earth's surface, changed the conditions of confluence, and aggravated the degree of flooding.

The abundance and loss of precipitation are determined by the sky, and the water is regulated by people. In years with a lot of precipitation, whether floods cause disasters and the magnitude of flood disasters are inseparable from human factors. Long-term deforestation is an important cause of this.

How did the floods and tsunamis come about?

Flood is a natural phenomenon caused by natural factors such as heavy rainfall, rapid melting of ice and snow, storm surge, etc., or the rapid increase in water level, and is a natural disaster. Objectively speaking, the frequent occurrence of floods has its irresistible reasons, and it can be said that the "mandate of heaven" cannot be violated. However, why did the Yangtze River disappear in just 100 years in the 20th century?

Why did a once-in-a-century flood become a once-in-a-few disaster? Once in 10 years? Compared with historical data, the frequency and severity of floods are quite consistent with the trend of population growth.

We have to admit that China's rapid population growth, the expansion of cultivated land, the reclamation of lakes and fields, indiscriminate deforestation and other man-made destruction have constantly changed the state of the earth's surface, changed the conditions of confluence, and aggravated the degree of flooding. The abundance and loss of precipitation are determined by the sky, and the water is regulated by people. In years with a lot of precipitation, whether floods cause disasters and the magnitude of flood disasters are inseparable from human factors.

Long-term deforestation is an important cause of this.

Tsunami causes: A tsunami is a catastrophic wave that is usually caused by the seabed with an epicenter within 50 km below the seafloor and a magnitude of 6 5 or more**. Tsunamis can also be caused by landslides or volcanic eruptions underwater or along the coast.

After a shock, 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 tsunami wavelength is greater than the maximum depth of the ocean, and the orbital motion is not much hindered near the ocean floor, and the wave can propagate regardless of the depth of the ocean.

Tsunamis do not necessarily need to be preceded by precipitation. In fact, precipitation is usually not the main cause of tsunamis. Tsunamis are huge waves caused by the movement of the earth's crust on the seabed caused by Shinwa, volcanic eruptions, submarine landslides, etc.

However, there are times when precipitation can play a role in a tsunami event, especially in certain specific situations:

1. Submarine landslides: Heavy rainfall may cause water seepage landslides to penetrate into the soil on the shore or seabed, increasing the saturation of the soil. If a slip or slippage occurs at such a high level of saturation, it can trigger a submarine landslide, which in turn can cause a tsunami.

2. Water carriers: Precipitation can increase water sources, such as increasing the amount of water in rivers, or forming a large amount of water in offshore areas. When a tsunami is triggered by other crustal movements, this extra moisture is also trapped in the tsunami waves, increasing the power of the tsunami.

In summary, precipitation is not usually necessary for tsunami formation, but in some cases it may have an impact on the formation of submarine landslides and the enhancement of tsunami waves. However, tsunamis are mainly caused by crustal movements, not precipitation.

The formation of tsunamis does not depend on precipitation, but is related to changes in the earth's crust on the seafloor. The formation of a tsunami usually requires the triggering of a large geomorphosis or other marine geological event. Precipitation and tsunami are two separate natural phenomena that do not have a direct causal relationship with each other.

How is a tsunami formed? A tsunami is a highly devastating natural disaster that causes irreversible damage to people. The Indian Ocean tsunami and the Japanese tsunami a few years ago left an indelible impression on people around the world.

As the saying goes, knowing oneself and knowing the other side can survive a hundred battles. This is a mysterious world to learn how tsunamis are formed and discover the true cause of the tsunami. **Activity is the main cause of tsunamis.

Tsunamis occur in or near the ocean as ** forms or weakens. In **, the seafloor plates are deformed, resulting in the transfer of water.

<> when ** weakens, the tectonic plates slide against each other, creating a large number of eddy currents, resulting in a large amount of water displacement and displacement, submarine landslides, and also causing tsunamis. The submarine slippery town of Hedong slope often occurs when ** or submarine volcanic eruptions. The sediments and rocks falling from these landslides and ** can also cause massive water movements, triggering tsunamis.

Tsunamis are formed by disturbances in seawater caused by rapid fluctuations in the topography of the seafloor. Factors that are prone to causing tsunamis are: volcanic eruptions, submarine landslides, etc.

Tsunamis are divided into:"Descending type"Tsunami and"Ascending"Tsunami, the former is caused by the sinking of the seafloor crust, and the latter is caused by the rise of the seafloor crust.

Tsunamis are governed by the topography of the seafloor, the geometry of the coastline, and the characteristics of the waves. Roaring walls of ice and waves repeat themselves every few minutes or tens of minutes, destroying banks, unable to cover the land, and taking away life and property. submarine landslides, etc.

Tsunamis are divided into:"Descending type"Tsunami and"Ascending"Tsunami, the former is caused by the sinking of the seafloor crust, and the latter is caused by the rise of the seafloor crust.

Do a detailed explanation of the problem for a detailed interpretation of the problem, I hope it will help you, if there are any questions, you can leave me a message in the comment area, you can comment with me more, if there is something wrong, you can also interact with me more, if you like the author, you can also follow me, the pat and like is the biggest help to me, thank you.

Tsunamis are formed by the impact of the sea depth with the land, and in the process of impacting the socks, a large wave will be generated, and it is suspected that a large force will be generated, so the tsunami is formed.

The sea water is in the sea, and when the seabed ** occurs, it begins to rise and fall violently, and a relatively strong wave will be formed, which is a tsunami.

Seawater is the water in the coastal zone, which rises and falls violently due to vibrations, and eventually forms powerful waves.

Seawater is actually the water in the sea, but because of the ** reason, the ground has caused fluctuations and pushed the seawater out.

Tsunamis are formed by strong disturbances in seawater caused by rapid changes in the topography of the seabed.

A tsunami is a destructive wave caused by a seafloor**, volcanic eruptions, submarine landslides, or changes in the air surface. Tsunamis have wave speeds of up to 700,800 kilometres per hour and can cross the ocean in a matter of hours; The wavelength can reach hundreds of kilometers and can travel thousands of kilometers with little energy loss; In the vast ocean, the wave height is less than one meter, but when it reaches the shallow water of the coast, the wavelength decreases and the wave height increases sharply, reaching tens of meters, forming a "wall of water" containing huge energy.

Tsunamis are mainly controlled by the topography of the seabed, the geometry of the coastline and the characteristics of the waves, and the roaring waves and ice walls repeat every few minutes or tens of minutes, destroying the embankments, flooding the land, and taking life and property, which is extremely destructive. The tsunami occurrence area of the world is roughly consistent with the ** zone. There are about 260 destructive tsunamis recorded worldwide, an average of about 260.

It happens once every six or seven years. Tsunamis in the Pacific Rim accounted for about 80% of the total.

Tsunami:

1. "Descending" tsunami: some tectonic ** causes a large-scale sharp decline in the submarine crust, the seawater first swells to the space of sudden staggered subsidence, and there is a large-scale accumulation of seawater above it, when the influx of 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, the tsunami formed by the movement of the submarine crust of this descending type is first manifested as an abnormal ebb tide phenomenon on the coast. The 1960 Chile** tsunami was of this type.

2. "Uplift" tsunami: some structures cause a large-scale sharp rise of the submarine crust, and the seawater also rises together with the uplift area, and there is a large-scale accumulation of seawater above the uplift area.

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.

The above content refers to Encyclopedia - Tsunami.