What are the major geological disasters in the world in the 21st century?

China's April 14, 2010, Qinghai Yushu ** killed and injured 2,183 and 84 missing, September 2009 - April 2010, drought in southwest China, 5 provinces and cities affected by drought area of 100 million mu, direct loss of 24.6 billion yuan, on May 12, 2008, Sichuan Wenchuan ** level caused 68,858 people killed, 366586 injured, missing 18,618 people, economic losses of 845.1 billion, January 10, 2008 snow disaster, 19 provincial-level administrative regions are affected by low temperature, rain, snow, and freezing disasters, 60 dead; 2 people are missing, and 10,000 people are urgently relocated; 1,000 hectares of crops affected; 10,000 houses collapsed and 10,000 houses damaged; Direct economic loss 537100 million yuan on April 3, 2010, the eruption of the Icelandic volcano is expected to affect the global meteorology for 2 years, Beijing time at 14:34 on February 27, 2010, the second largest city in Chile, Concepción, the Richter level ** died 850 people, at 16:53 on January 12, 2010 (5:53 Beijing time on the 13th), 150,000 were killed on the Richter scale, and it is expected to reach 200,000 In 2009, influenza A caused tens of thousands of deaths around the world, and on December 26, 2004, Indonesia ** caused a tsunami Scale:

Richter Depth: 30 km Epicenter: ...More than 510,000 people were injured in 2003, the global SARS caused nearly 1,000 deaths, and the mortality rate accounted for 11%.

In the 21st century, there were mainly tsunami in Indonesia, tropical storm "Sid", hurricane Katrina, Chile**, Wenchuan**, and volcanic eruptions in Iceland.

First of all, natural causes are the root cause of the frequent occurrence of geological disasters. Recently, the global geological activities have become more active, especially the activity of the ** volcanic belt around the Pacific Ocean has become more and more active. Basically, it can be considered that the Pacific Rim region has now entered a frequent cycle.

At the same time, some geological activities are significant, geological disasters are prone to occur in areas and densely populated areas coincide, some areas have rapid population growth, strong momentum of economic development, the number of population and wealth per unit land area has increased significantly compared with before, once geological disasters occur, it is bound to cause large-scale population and property losses.

It must be fully recognized that human factors play an important role in the process of inducing geological disasters, and sometimes even become the dominant factor. The frequent occurrence of geological disasters such as landslides and debris flows is directly related to the large-scale destruction of vegetation in the mountainous areas in the upper reaches of the river, and the mountain topsoil suffers serious erosion, and the rock mass is fragile and loose, which is very easy to cause when the short-term rainstorm occurs. In areas with complex geological conditions in the upper reaches of the river, the construction of water conservancy facilities may change the original local in-situ stress conditions, and when the equilibrium state is broken, it will occur, and even produce certain destructiveness.

Human impact on nature is becoming more and more intense, and extreme weather is occurring more and more frequently.

A few years ago, could you imagine a temperature change of more than 10 degrees over two days? There is basically no transition phase in temperature.

The occurrence of drought in the south and heavy rain in the center of the country is of course increasing with the increase of extreme weather.

China: On April 14, 2010, 2,183 people were killed and injured in the Yushu** class in Qinghai, and 84 people were missing.

From September 2009 to April 2010, the area affected by drought in five provinces and cities in southwest China was 100 million mu, with a direct loss of 24.6 billion yuan.

On May 12, 2008, 68,858 people were killed, 366586 were injured, 18,618 people were missing, and the economic loss was 845.1 billion yuan.

The snowstorm that began on January 10, 2008 was affected by low temperature, rain, snow and freezing disasters in 19 provincial-level administrative regions, killing 60 people. 2 people are missing, and 10,000 people are urgently relocated; 1,000 hectares of crops affected; 10,000 houses collapsed and 10,000 houses damaged; Direct economic loss 537100 million yuan.

The eruption of the Icelandic volcano on April 3, 2010 is expected to affect the global meteorology for two years.

At 14:34 Beijing time on February 27, 2010, 850 people died in Concepción, Chile's second largest city.

At 16:53 on January 12, 2010 (5:53 Beijing time on the 13th), 150,000 people were killed on the Richter scale, and it is expected to reach 200,000 in 2009, and influenza A caused tens of thousands of deaths worldwide on December 26, 2004, and a tsunami caused by Indonesia** Scale: Richter depth: 30 kilometers Epicenter: ...

More than 510,000 people were injured in 2003, and the global SARS epidemic caused nearly 1,000 deaths, accounting for 11% of the mortality rate

Since the beginning of the 21st century, the global ecological environment has been deteriorating, and various natural disasters have occurred continuously. In the face of the painful lesson, human beings have begun to reflect on what they have done in the past and realize that man and nature should coexist and co-prosper and develop in harmony. As a result, a scientific ecological value of co-evolution between man and nature has emerged and has been recognized by more and more people.

1.911 Incident.

2.War in Afghanistan.

3.Walking pneumonia.

4.Iraq War.

5.Highly pathogenic avian influenza.

6.Snow disaster in southern China.

7.Wenchuan, China**.

8.The global economic crisis triggered by the Wall Street financial turmoil.

A: B: The world's two major natural disaster belts. The first is the natural disaster belt of several hundred kilometers wide along the coast of the Pacific Rim; The second is the natural disaster belt of Liangyan in the global opening section of the north latitude of 20-50 north. So at the same time, it is the Mediterranean-Himalayan zone that is in the belt of two major natural disasters.

Select item B.

Geological disasters in a broad sense include **, tsunamis, volcanoes, mud and rockslides, landslides, ground subsidence and so on.

The geological disasters mentioned in colloquial language, in the general sense, refer to mud and rockslides, landslides, ground subsidence, etc.

The mountainous areas in the west and south of China, especially in Sichuan-Shaanxi, Sichuan-Yunnan, Sichuan-Tibet and other regions, are prone to cause geological disasters such as landslides and debris flows due to the high mountains and the severe weathering of rock formations and the relatively heavy precipitation in the rainy season. In the eastern part of the country, such as river deltas, geological disasters such as land subsidence are prone to occur due to factors such as groundwater fluctuations and artificial disturbance. In addition, in areas where mineral resources are concentrated, there are also areas prone to disasters such as ground subsidence due to factors such as the disturbance of the groundwater table due to mining disturbances.

Globally, areas affected by crustal movement and plate squeezing are more likely to have disasters such as ** and volcanoes.

The largest ** in the history of the world:

On May 22, 1960, at 19:11, it occurred in Chile, South America, and the magnitude of the earthquake reached the magnitude. Starting from May 21, the ** that occurred in a month, 3 times exceeded level 8, and 10 times exceeded level 7, which is rare in scale and release so much energy.

The largest volcanic eruption of the 20th century occurred in 1912 and lasted from June 6 to June 8, culminating in the formation of Novaraputa Volcano. The eruption of Novaraputa, which has an eruption index of 6, produced more material from the Alaska Peninsula than any other Alaskan volcanic eruption in history. In the Shelikov Strait on the island of Kodiak, volcanic ash fell from the sky for three days, and the ash accumulated on the ground in the main town was a foot (centimeter) thick.

The eruption was so violent that it caused the top of Mount Katmai, which is 6 miles (km) away, to collapse.

Mount Pinatubo erupted in the Philippines in 1991. Luzon, Philippines.