Major disasters. The most earthquake-prone cities in the world

For centuries, natural disasters have haunted humanity. Some happened so long ago that scientists cannot estimate the scale of the destruction. For example, the Mediterranean island of Stroggli is believed to have been wiped off the map by a volcanic eruption around 1500 BC. The tsunami caused destroyed the entire Minoan civilization, but no one knows even the approximate number of deaths. However, the 10 worst known disasters, mostly earthquakes and floods, killed an estimated 10 million people.

10. Aleppo earthquake - 1138, Syria (Victims: 230,000)

One of the most powerful earthquakes known to mankind, and the fourth largest in the number of victims (estimated at over 230 thousand dead). The city of Aleppo, a large and populous urban center since antiquity, is geologically located along the northern part of a system of major geological faults, which also includes the Dead Sea Trench, and which separate the Arabian and African tectonic plates, which are in constant interaction. The Damascus chronicler Ibn al-Qalanisi recorded the date of the earthquake - Wednesday, October 11, 1138, and also indicated the number of victims - over 230 thousand people. Such a number of casualties and destruction shocked contemporaries, especially the Western crusader knights, since at that time in northwestern Europe, where most of them were from, there was a rare city with a population of 10 thousand inhabitants. After the earthquake, the population of Aleppo recovered only to early XIX century, when the city again recorded a population of 200 thousand inhabitants.

9. Indian Ocean Earthquake - 2004, Indian Ocean (Victims: 230,000+)

The third, and according to some estimates the second most powerful, is the underwater earthquake in the Indian Ocean that took place on December 26, 2004. It caused a tsunami, which caused most of the damage. Scientists estimate the earthquake's magnitude to be between 9.1 and 9.3. The epicenter was underwater, north of the island of Simeulue, northwest of Indonesian Sumatra. Huge waves reached the shores of Thailand, southern India and Indonesia. Then the wave height reached 15 meters. Many areas suffered enormous destruction and casualties, including Port Elizabeth, South Africa, which is 6,900 km from the epicenter. The exact number of victims is unknown, but it is estimated from 225 to 300 thousand people. The true figure can no longer be calculated, since many bodies were simply carried away into the sea. It’s curious, but a few hours before the arrival of the tsunami, many animals reacted sensitively to the impending disaster - they left coastal zones, having moved to higher ground.

8. Banqiao Dam Failure - 1975, China (Victims: 231,000)

There are different estimates of the number of victims of the disaster. The official figure, about 26,000 people, only takes into account those directly drowned in the flood itself; Taking into account those who died from epidemics and famine that spread as a result of the disaster, the total number of victims is, according to various estimates, 171,000 or even 230,000. The dam was designed in such a way as to survive the largest floods that occur once every thousand years (306 mm of precipitation per day). However, in August 1975, the largest flooding in 2,000 years occurred as a consequence of the powerful Typhoon Nina and several days of record storms. The flood caused a huge wave of water 10 kilometers wide, 3-7 meters high. The tide moved 50 kilometers from the coast in an hour and reached the plains, creating artificial lakes there with a total area of ​​12,000 sq. km. Seven provinces were flooded, including thousands of square kilometers of countryside and countless communications lines.

7. Tangshan earthquake - 1976, China (Victims: 242,000)

The second most powerful earthquake also occurred in China. On July 28, 1976, the Tangshan earthquake occurred in Hebei province. Its magnitude was 8.2, which allows us to consider the event the largest natural disaster of the century. The official death toll was 242,419. However, most likely the figure was underestimated by the PRC authorities by 3-4 times. This suspicion is based on the fact that according to Chinese documents, the strength of the earthquake is indicated as only 7.8 points. Tangshan was almost immediately destroyed by powerful tremors, the epicenter of which was located at a depth of 22 km below the city. Even Tianjin and Beijing, which are located 140 kilometers from the epicenter, were destroyed. The consequences of the disaster were terrible - 5.3 million houses were destroyed and damaged to such an extent that they were uninhabitable. The number of victims increased due to the subsequent series of tremors to 7.1. Today in the center of Tangshan there is a stele that reminds of the terrible disaster, and there is an information center dedicated to those events. It is a unique museum on this topic, the only one in China.

6. Kaifeng Flood - 1642, China (Victims: 300,000)

Long-suffering China again. Formally, this disaster can be considered natural, but it was caused by human hands. In 1642 in China there was peasant revolt, whose leader was Li Zicheng. The rebels approached the city of Kaifeng. In order to prevent the rebels from capturing the city, the command of the Ming Dynasty troops gave the order to flood the city and surrounding area with the waters of the Yellow River. When the water receded and the famine caused by the artificial flood ended, it turned out that of the 600,000 people in the city and surrounding area, only half survived. At that time it was one of the bloodiest punitive actions in history.

5. Indian Cyclone - 1839, India (Victims: 300,000+)

Although the photograph of the cyclone does not date back to 1839, it can be used to appreciate the full power of this natural phenomenon. The Indian cyclone of 1839 was not destructive in itself, but it produced powerful tidal waves that killed 300,000 people. Tidal waves completely destroyed the city of Coringa and sank 20,000 ships that were in the city's bay.

4. Great Chinese Earthquake - 1556 (Victims: 830,000)

In 1556, the most destructive earthquake in human history took place, called the Great Chinese Earthquake. It happened on January 23, 1556 in Shaanxi province. Historians believe the disaster killed about 830,000 people, more than any other similar event. Some areas of Shaanxi were completely depopulated, and in the rest more than half the people died. Such a huge number of victims was explained by the fact that most of the inhabitants lived in loess caves, which immediately collapsed during the first shocks or were subsequently flooded by mudflows. According to modern estimates, this earthquake was assigned a category of 11 points. One of the eyewitnesses warned his descendants that when a disaster begins, they should not rush headlong into the street: “When a bird’s nest falls from a tree, the eggs often remain unharmed.” Such words are evidence that many people died while trying to leave their homes. The destructiveness of the earthquake is evidenced by the ancient steles of Xi'an, collected in the local Beilin Museum. Many of them were crumbling or cracked. During the cataclysm, the Wild Goose Pagoda located here survived, but its foundation sank by 1.6 meters.

3. Bhola Cyclone - 1970 (Casualties: 500,000 - 1,000,000)

A destructive tropical cyclone that struck the territories of East Pakistan and Indian West Bengal on November 12, 1970. The deadliest tropical cyclone and one of the most destructive natural disasters in modern history. About half a million people lost their lives when the storm surge flooded many of the low-lying islands of the Ganges delta. It was the sixth storm cyclone of the 1970 North Indian Ocean hurricane season and the strongest of the year.
The cyclone formed over the central part of the Bay of Bengal on November 8, after which it began to move northward, gaining strength. It reached its peak power on the evening of November 12, and made contact with the East Pakistan coastline that same night. The storm surge devastated numerous offshore islands, sweeping away entire villages and destroying the region's farmland in its wake. In the worst-affected area of ​​the country, Tazumuddin upazila, more than 45% of the 167,000 population died.
Political consequences
The unwieldy pace of rescue efforts only increased anger and resentment in East Pakistan and contributed to the local resistance movement. Subsidies were slow to arrive, and transport was slow to deliver desperately needed supplies to storm-ravaged areas. In March 1971, tensions steadily increased; foreign specialists began to leave the province, fearing outbreaks of violence. Subsequently, the situation continued to deteriorate and escalated into the War of Independence, which began on March 26. Later, in December of the same year, this conflict expanded into the Third Indo-Pakistani War, which culminated in the creation of the state of Bangladesh. The events that took place can be considered one of the first cases in which a natural phenomenon provoked a civil war, subsequent external intervention by a third power and the disintegration of one country into two independent states.

2. Yellow River Valley Flood - 1887, China (Victims: 900,000 - 2,000,000)

One of the worst floods in modern times human history, which, according to various sources, took from 1.5 to 7 million human lives, happened in the late spring of 1887 in the northern provinces of China, in the Yellow River Valley. Heavy rains throughout almost all of Hunan that spring caused the river to flood. The first flood occurred at a sharp bend, in the vicinity of the city of Zhangzhou.
Day after day, bubbling waters invaded the cities, destroying and devastating them. In total, 600 cities along the river's banks were affected by the flood, including the walled city of Hunan. The rapid flow continued to wash away fields, animals, cities and people, flooding an area 70 km wide with water that reached a depth of 15 meters.
The water, often against the wind and tide, slowly flooded terrace after terrace, on each of which 12 to 100 families accumulated. Of the 10 houses, only one or two survived. Half of the buildings were hidden under water. People lay on the roofs of houses, and old people who did not die of hunger died of cold.
The tops of the poplars that once stood along the roads stuck out of the water like algae. Here and there they held onto old trees with thick branches strong men and called for help. In one place, a box containing dead child, who was placed there for safety by his parents. The box contained food and a note with a name. Elsewhere, a family was discovered, all the members of which had died, the child was placed in the most high place...well covered with clothing.”
The destruction and devastation left after the waters subsided was simply terrible. Statistics have never been able to cope with the task of counting. By 1889, when the Yellow River finally returned to its course, disease was added to the misfortunes of the flood. It is estimated that half a million people died from cholera.

1. Great Flood - 1931, China (Victims: 1,000,000 - 4,000,000)

The summer monsoon period of 1931 was unusually stormy. Heavy rains and tropical cyclones raged across river basins. The dams withstood intense rain and storms for weeks, but they eventually gave way and collapsed in hundreds of places. Approximately 333,000 hectares of land were flooded, at least 40,000,000 people lost their homes, and crop losses were enormous. On large areas The water did not go away for three to six months. Diseases, food shortages, and lack of shelter led to the death of a total of 3.7 million people.
One of the epicenters of the tragedy was the city of Gaoyou in the northern province of Jiangsu. A powerful typhoon hit China's fifth largest lake, Gaoyu, on August 26, 1931. Its water level has already risen to record heights as a result of heavy rains in previous weeks. A squally wind raised high waves that crashed against the dams. After midnight the battle was lost. The dams were broken in six places, and the largest gap reached almost 700 m. A stormy stream swept through the city and the province. In one morning alone, about 10,000 people died in Gaoyu.

War takes tens of thousands of human lives, but even the bloodiest one cannot compare with the elements: the planet does not spare us - and does not even pay attention to the number of victims suffered from cyclones, floods and other terrible misfortunes. What's worse - a tornado or a fire? What are the chances of surviving a volcanic eruption? What about during an avalanche? Unfortunately, the answer in both cases is minimal. We have collected 10 of the most terrible natural disasters in the entire history of mankind: apparently, nature is beginning, gradually, to punish us for the careless destruction of the planet.

Eruption of Mont Pele volcano

Flood in China

Fire in Curonian-2

Avalanche of Huascaran

Cyclone Bhola

Storm in Iran

Tanshan earthquake

Tornado in Daulatpur

European heat

Indian Ocean Tsunami

The volcano that destroyed ancient Pompeii cannot be responsible for the worst natural disaster in history, despite the fact that many films have been made and many songs have been sung on the subject. Modern natural disasters claim countless lives. Take a look at our grim list. It contains only the most terrible disasters of all times.

Earthquake in the Syrian city of Aleppo (1138)

Fortunately, these days the news reports do not shock us with giant faults in the Dead Sea area. Now there is a relatively stable tectonic relief. Syria experienced unprecedented cataclysms in the 12th century. Seismic activity in the north of the country continued for almost a year and ultimately resulted in a devastating cataclysm. In 1138, the city of Aleppo was completely destroyed, other settlements and military installations were damaged. In total, the disaster took the lives of 230,000 people.

Indian Ocean earthquake and tsunami (2004)

This is the only event on the list that many of us caught. This tragedy is considered the deadliest ever modern history. It all started with an underwater earthquake of magnitude 9.3 off the coast of Indonesia. Then the disaster transformed into a violent tsunami, rushing to the shores of 11 countries. In total, 225,000 people died, and about a million more people along the Indian Ocean coast were left homeless. It's sad that this happened during the heyday of earthquake-resistant architectural technology, and not in the days of dugouts with thatched roofs.

Antioch earthquake (526)

People like to compare the potential end of the world to disasters of biblical proportions. The earthquake in Antioch is the only natural disaster that is more or less close to the biblical era. This natural disaster occurred in the first millennium after the birth of Christ. The Byzantine city experienced an earthquake of magnitude 7.0 between May 20 and May 29, 526. Due to the high population density (which was rare for the region at the time), 250,000 people died. The fires that arose as a result of the cataclysm also contributed to the increase in the number of victims.

Earthquake in Gansu Province of China (1920)

The next natural disaster on our list created a giant rift over 160 kilometers long. According to experts, the greatest damage was caused not by an earthquake measuring 7.8 on the Richter scale, but by landslides that carried entire cities underground and were main reason slowing down the provision of assistance. According to various estimates, the cataclysm claimed the lives of 230,000 to 273,000 inhabitants.

Tangshan Earthquake (1976)

Another terrible earthquake of the 20th century shows that the natural disaster itself is not as terrible as the imperfect infrastructure of the area in which it occurs. Tremors with a magnitude of 7.8 hit China's Tangshan on the night of July 28 and instantly leveled 92 percent of residential buildings in this million-strong city. Lack of food, water and other resources became the main obstacles in rescue efforts. In addition, railway tracks and bridges were destroyed, so there was nowhere to wait for help. Many victims died under the rubble.

Cyclone at Coringa, India (1839)

By the early 19th century, Coringa had become the main Indian port city at the mouth of the Godavari River. On the night of November 25, 1839, this title had to be relinquished. The cyclone that struck destroyed 20,000 ships and 300,000 people. Many victims were thrown into the open sea. Now there is a small village on the site of Coringa.

Cyclone Bhola, Bangladesh (1970)

The Bay of Bengal regularly experiences natural disasters, but none was more devastating than Cyclone Bhola. Hurricane wind gusts on November 11, 1970 reached 225 kilometers per hour. Due to extreme poverty in the region, no one was able to warn the population of the impending danger. As a result, the cyclone destroyed more than half a million lives.

Chinese earthquake (1556)

Despite the fact that in the 16th century a system for assessing the magnitude of tremors had not yet been introduced, historians have calculated that the earthquake that occurred in China in 1556 could have had a magnitude of 8.0 - 8.5. It so happened that the densely populated area took the brunt of the attack. The disaster created deep canyons that forever trapped more than 800,000 people.

Flood on the Yellow River (1887)

One of the largest rivers in the world is responsible for more deaths than all other rivers combined. In 1887, the deadliest flood was recorded, which was exacerbated by heavy rains and the destruction of dams in the Changshu area. The flooded low-lying plains claimed the lives of about two million Chinese.

Flood on the Yangtze River (1931)

A record natural disaster occurred with the onset of heavy rains and flooding on the Yangtze River in April 1931. This natural disaster, coupled with dysentery and other diseases, claimed about three million lives. In addition, the destruction of rice fields caused widespread famine.

Disasters have been known for a long time - volcanic eruptions, powerful earthquakes, and tornadoes. In the last century there have been many water disasters and terrible nuclear disasters.

The worst disasters on the water

In 1915, a British passenger liner was torpedoed by a German submarine. The ship sank in eighteen minutes, being thirteen kilometers from the coast of Ireland. One thousand one hundred and ninety-eight people died.

In April 1944, a terrible disaster occurred in the port of Bombay. It all started with the fact that during the unloading of a single-screw steamer, which was loaded with gross violations of safety regulations, a violent explosion occurred. It is known that the ship carried one and a half tons of explosives, several tons of cotton, sulfur, wood, and gold bars. After the first explosion, a second one sounded. The burning cotton scattered over a radius of almost a kilometer. Almost all the ships and warehouses burned, and fires started in the city. They were extinguished only after two weeks. As a result, about two and a half thousand people were hospitalized, one thousand three hundred and seventy-six people died. The port was restored only after seven months.

The most famous water disaster is the sinking of the Titanic. Colliding with an iceberg during its first voyage, the ship sank. More than one and a half thousand people died.

In December 1917, the French warship Mont Blanc collided with the Norwegian ship Imo near the city of Halifax. A powerful explosion occurred, leading to the destruction of not only the port, but also part of the city. The fact is that Mont Blanc was loaded exclusively with explosives. About two thousand people died, nine thousand were injured. This is the most powerful explosion of the pre-nuclear era.

Three thousand one hundred and thirty people died on the French cruiser after a torpedo attack by a German submarine in 1916. As a result of the torpedoing of the German floating hospital "General Steuben", about three thousand six hundred and eight people died.

In December 1987, the Philippine passenger ferry Dona Paz collided with the tanker Vector. Four thousand three hundred and seventy-five people died.

In May 1945, a tragedy occurred in the Baltic Sea, which claimed the lives of about eight thousand people. The cargo ship Tilbeck and the liner Cap Arcona came under fire from British aircraft. As a result of the torpedoing of the Goya by a Soviet submarine in the spring of 1945, six thousand nine hundred people died.

“Wilhelm Gustlow” was the name of the German passenger liner sunk by a submarine under the command of Marinesco in January 1945. The exact number of victims is unknown, approximately nine thousand people.

The worst disasters in Russia

The worst environmental disaster in the territory former USSR the death of the Aral Sea is considered. For a number of reasons: soil, social, biological, the Aral Sea has almost completely dried up in fifty years. Most of its tributaries were used for irrigation and some other agricultural purposes in the sixties. The Aral Sea was the fourth largest lake in the world. Since the influx fresh water decreased significantly, the lake gradually died.

In the summer of 2012, a massive flood occurred in the Krasnodar region. It is considered the largest disaster on Russian territory. In two July days, five months' worth of precipitation fell. The city of Krymsk was almost completely washed away by water. Officially, 179 people were declared dead, of which 159 were residents of Krymsk. More than 34 thousand local residents were affected.

The worst nuclear disasters

In Japan, in March 2011, an explosion occurred at the Fukushima-1 nuclear power plant during an earthquake. Because of this, a large amount of radioactive substances entered the atmosphere. At first, officials hushed up the scale of the disaster.

After the Chernobyl disaster, the most significant nuclear accident is considered to be the one that occurred in 1999 in the Japanese city of Tokaimura. An accident occurred at a uranium processing plant. Six hundred people were exposed to radiation, four people died.

The worst disaster in human history

In terms of the number of victims, the disaster that occurred in India in the city of Bhapole in December 1984 is considered the largest. There was a chemical leak at one of the factories. Eighteen thousand people died. Until now, the causes of this disaster have not been fully elucidated.

It is impossible not to mention the worst fire that occurred in London in 1666. The fire spread across the city with lightning speed, destroying about seventy thousand houses and killing about eighty thousand people. The fire lasted for four days.

Not only disasters are terrible, but also entertainment. The website has a rating of the scariest attractions in the world.
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Over the billions of years of our planet’s existence, certain mechanisms by which nature works have formed. Many of these mechanisms are subtle and harmless, while others are large-scale and cause enormous destruction. In this rating we will talk about the 11 most destructive natural disasters on our planet, some of which can destroy thousands of people and an entire city in a few minutes.

11

A mudflow is a mud or mud-stone flow that suddenly forms in the beds of mountain rivers as a result of rainfall, rapid melting of glaciers or seasonal snow cover. The decisive factor in the occurrence may be deforestation in mountainous areas - tree roots hold the top of the soil, which prevents the occurrence of a mudflow. This phenomenon is short-term and usually lasts from 1 to 3 hours, typical for small watercourses up to 25-30 kilometers long. On their way, the streams lay deep channels, which usual time They are dry or contain small streams. The consequences of mudflows can be catastrophic.

Imagine that a mass of earth, silt, stones, snow, sand, driven by a strong flow of water, fell on the city from the mountains. This stream will demolish the dacha buildings located at the foot of the city along with people and orchards. This entire stream will rush into the city, turning its streets into raging rivers with steep banks of destroyed houses. Houses will be torn off their foundations and, along with their people, will be carried away by a stormy stream.

10

Landslide is the sliding of masses of rocks down a slope under the influence of gravity, often while maintaining their coherence and solidity. Landslides occur on the slopes of valleys or river banks, in the mountains, on the shores of the seas, and the largest ones occur at the bottom of the seas. The displacement of large masses of earth or rock along a slope is caused in most cases by wetting the soil with rainwater so that the soil mass becomes heavier and more mobile. Such large landslides damage agricultural land, businesses, settlements. To combat landslides, bank protection structures and planting of vegetation are used.

Only rapid landslides, the speed of which is several tens of kilometers, can cause real natural disasters with hundreds of casualties when there is no time for evacuation. Imagine that huge pieces of soil are quickly moving from a mountain directly onto a village or city, and under tons of this earth, buildings are destroyed and people who did not have time to leave the landslide site die.

9

A sandstorm is an atmospheric phenomenon in the form of transport large quantities dust, soil particles and grains of sand blown several meters from the ground with a noticeable deterioration in horizontal visibility. In this case, dust and sand rise into the air and at the same time dust settles over a large area. Depending on the color of the soil in a given region, distant objects take on a grayish, yellowish or reddish tint. It usually occurs when the soil surface is dry and the wind speed is 10 m/s or more.

Most often, these catastrophic phenomena occur in the desert. A sure sign that a sandstorm is starting is sudden silence. Rustles and sounds disappear with the wind. The desert literally freezes. A small cloud appears on the horizon, which quickly grows and turns into a black and purple cloud. The missing wind rises and very quickly reaches speeds of up to 150-200 km/h. A sandstorm can cover streets within a radius of several kilometers with sand and dust, but the main danger of sandstorms is the wind and poor visibility, which causes car crashes, in which dozens of people are injured, and some even die.

8

An avalanche is a mass of snow falling or sliding down the slopes of mountains. Snow avalanches pose considerable danger, causing casualties among climbers, amateurs alpine skiing and snowboarding and causing significant damage to property. Sometimes avalanches have catastrophic consequences, destroying entire villages and causing the death of dozens of people. Snow avalanches, to one degree or another, are common in all mountainous regions. In winter, they are the main natural danger of the mountains.

Tones of snow are held on top of mountains due to the force of friction. Large avalanches occur at the moment when the pressure force of the snow mass begins to exceed the force of friction. A snow avalanche is usually triggered by climatic reasons: sudden changes in weather, rain, heavy snowfalls, as well as mechanical effects on the snow mass, including the effects of rockfalls, earthquakes, etc. Sometimes an avalanche can begin due to a minor shock such as a weapon shot or pressure on the snow of a person. The volume of snow in an avalanche can reach several million cubic meters. However, even avalanches with a volume of about 5 m³ can be life-threatening.

7

A volcanic eruption is the process of a volcano throwing out earth's surface hot debris, ash, an outpouring of magma, which, pouring out to the surface, becomes lava. A major volcanic eruption can last from a few hours to many years. Hot clouds of ash and gases, capable of moving at speeds of hundreds of kilometers per hour and rising hundreds of meters into the air. The volcano emits gases, liquids and solids with high temperatures. This often causes the destruction of buildings and loss of life. Lava and other hot erupted substances flow down the slopes of the mountain and burn out everything they meet on their way, causing innumerable casualties and staggering material losses. The only protection against volcanoes is general evacuation, so the population must be familiar with the evacuation plan and unquestioningly obey the authorities if necessary.

It is worth noting that the danger from a volcanic eruption exists not only for the region around the mountain. Potentially, volcanoes threaten the lives of all life on Earth, so you shouldn’t be lenient towards these hot guys. Almost all manifestations of volcanic activity are dangerous. The danger of boiling lava goes without saying. But no less terrible is the ash, which penetrates literally everywhere in the form of continuous gray-black snowfall, which covers streets, ponds, and entire cities. Geophysicists say they are capable of eruptions hundreds of times more powerful than those ever observed. Major volcanic eruptions, however, have already occurred on Earth - long before the advent of civilization.

6

A tornado or tornado is an atmospheric vortex that arises in a thundercloud and spreads down, often to the very surface of the earth, in the form of a cloud arm or trunk with a diameter of tens and hundreds of meters. Typically, the diameter of a tornado funnel on land is 300-400 meters, but if a tornado occurs on the surface of water, this value can be only 20-30 meters, and when the funnel passes over land it can reach 1-3 kilometers. Largest quantity Tornadoes are recorded on the North American continent, especially in the central states of the United States. About a thousand tornadoes occur in the United States every year. The strongest tornadoes can last up to an hour or more. But most of them last no more than ten minutes.

On average, about 60 people die from tornadoes each year, mostly from flying or falling debris. However, it happens that huge tornadoes rush at a speed of about 100 kilometers per hour, destroying all buildings in their path. The maximum recorded wind speed in the largest tornado is about 500 kilometers per hour. During such tornadoes, the death toll can number in the hundreds and the number of injured in the thousands, not to mention the material damage. The reasons for the formation of tornadoes have not yet been fully studied.

5

A hurricane or tropical cyclone is a type of low-pressure weather system that occurs over a warm sea surface and is accompanied by severe thunderstorms, heavy rainfall and gale-force winds. The term “tropical” refers to both the geographic area and the formation of these cyclones in tropical air masses. It is generally accepted, according to the Beaufort scale, that a storm becomes a hurricane when wind speeds exceed 117 km/h. The strongest hurricanes can cause not only extreme downpours, but also large waves on the sea surface, storm surges and tornadoes. Tropical cyclones can arise and maintain their strength only over the surface of large bodies of water, while over land they quickly lose strength.

A hurricane can cause heavy rain, tornadoes, small tsunamis and floods. The direct effect of tropical cyclones on land is stormy winds that can destroy buildings, bridges and other man-made structures. The strongest sustained winds within the cyclone exceed 70 meters per second. The worst effect of tropical cyclones in terms of death toll has historically been storm surge, the rise in sea level caused by the cyclone, which on average accounts for about 90% of the casualties. Over the past two centuries, tropical cyclones have killed 1.9 million people worldwide. In addition to the direct effect on residential buildings and economic facilities, tropical cyclones destroy infrastructure, including roads, bridges, and power lines, causing enormous economic damage to the affected areas.

The most destructive and terrible hurricane in US history, Katrina, occurred at the end of August 2005. The heaviest damage was caused to New Orleans in Louisiana, where about 80% of the city's area was under water. The disaster killed 1,836 residents and caused economic losses of $125 billion.

4

Flood - flooding of an area as a result of rising water levels in rivers, lakes, seas due to rains, rapid snow melting, wind surge of water to the coast and other reasons, which damages people’s health and even leads to their death, and also causes material damage. For example, in mid-January 2009, the largest flood in Brazil occurred. More than 60 cities were affected then. About 13 thousand people fled their homes, more than 800 people died. Floods and numerous landslides are caused by heavy rains.

Heavy monsoon rains have continued in Southeast Asia since mid-July 2001, causing landslides and flooding in the Mekong River region. As a result, Thailand experienced its worst floods in the last half century. Streams of water flooded villages, ancient temples, farms and factories. At least 280 people died in Thailand, and another 200 in neighboring Cambodia. About 8.2 million people in 60 of Thailand's 77 provinces were affected by flooding, and economic losses currently estimated to exceed $2 billion.

Drought is a long period of stable weather with high air temperatures and low precipitation, as a result of which the soil moisture reserves decrease and the suppression and death of crops occurs. The onset of severe drought is usually associated with the establishment of a sedentary high anticyclone. Abundance solar heat and gradually decreasing air humidity create increased evaporation, and therefore the reserves of soil moisture are depleted without replenishment by rain. Gradually, as soil drought intensifies, ponds, rivers, lakes, and springs dry up—a hydrological drought begins.

For example, in Thailand, almost every year, severe floods alternate with severe droughts, when a state of emergency is declared in dozens of provinces, and several million people feel the effects of the drought in one way or another. As for the victims of this natural phenomenon, in Africa alone, from 1970 to 2010, the death toll from droughts is 1 million people.

2

Tsunamis are long waves generated by powerful impact throughout the entire thickness of water in an ocean or other body of water. Most tsunamis are caused by underwater earthquakes, during which a portion of the seabed suddenly shifts. Tsunamis are formed during an earthquake of any strength, but those that arise due to strong earthquakes with a magnitude of more than 7 on the Richter scale reach great strength. As a result of an earthquake, several waves are propagated. More than 80% of tsunamis occur on the periphery of the Pacific Ocean. The first scientific description of the phenomenon was given by José de Acosta in 1586 in Lima, Peru, after a powerful earthquake, then a strong tsunami 25 meters high burst onto land at a distance of 10 km.

The largest tsunamis in the world occurred in 2004 and 2011. So, on December 26, 2004 at 00:58, a powerful earthquake of magnitude 9.3 occurred - the second most powerful of all recorded, which caused the deadliest tsunami of all known. Asian countries and African Somalia were hit by the tsunami. Total the number of deaths exceeded 235 thousand people. The second tsunami occurred on March 11, 2011 in Japan after a strong earthquake of magnitude 9.0 with an epicenter caused a tsunami with a wave height exceeding 40 meters. In addition, the earthquake and subsequent tsunami caused the accident at the Fukushima I nuclear power plant. As of July 2, 2011, the official death toll from the earthquake and tsunami in Japan is 15,524 people, 7,130 people are missing, 5,393 people wounded.

1

An earthquake is an underground tremors and vibrations of the Earth's surface caused by natural causes. Small tremors can also be caused by the rise of lava during volcanic eruptions. About a million earthquakes occur throughout the Earth each year, but most are so small that they go unnoticed. The strongest earthquakes, capable of causing widespread destruction, occur on the planet approximately once every two weeks. Most of them fall on the bottom of the oceans, and therefore are not accompanied by catastrophic consequences if an earthquake occurs without a tsunami.

Earthquakes are best known for the devastation they can cause. Destructions of buildings and structures are caused by soil vibrations or giant tidal waves (tsunamis) that occur during seismic displacements on seabed. Powerful earthquake begins with the rupture and movement of rocks at some place deep in the Earth. This location is called the earthquake focus or hypocenter. Its depth is usually no more than 100 km, but sometimes it reaches 700 km. Sometimes the source of an earthquake can be near the surface of the Earth. In such cases, if the earthquake is strong, bridges, roads, houses and other structures are torn and destroyed.

The largest natural disaster is considered to be an earthquake of magnitude 8.2 on July 28, 1976 in the Chinese city of Tangshan, Hebei Province. According to official data from the PRC authorities, the death toll was 242,419 people, however, according to some estimates, the death toll reaches 800 thousand people. At 3:42 local time the city was destroyed by a strong earthquake. There was also destruction in Tianjin and Beijing, just 140 km to the west. As a result of the earthquake, about 5.3 million houses were destroyed or damaged so much that they were uninhabitable. Several aftershocks, the strongest of which had a magnitude of 7.1, led to even greater casualties. The Tangshan earthquake is the second-largest in history after the most destructive earthquake in Shaanxi in 1556. About 830 thousand people died then.