The main natural disasters in Northeast China include earthquakes, agrometeorological disasters, crop diseases and insect pests, forest diseases and insect pests and forest fires. This earthquake is the worst disaster. 1February 4, 975, the earthquake with magnitude 7.3, Haicheng and Yingkou, Liaoning Province, are examples. In densely populated and industrialized areas, although the earthquake work department predicted the earthquake, effective preventive measures were taken locally. Greatly reduced the loss of life or personal injury caused by the earthquake. However, housing construction and other projects have been damaged and lost to varying degrees. How big is the area of sand liquefaction in this earthquake? 3000 square kilometers. Landslides along the liquefied sandy land, the damage of bridges, the inclination of wine stations, the bending of underground pipelines and many other serious disasters. In Liaohe Oilfield, farmland was destroyed. Occurred in 1987, and natural disasters such as forest fires are the most prominent in Daxinganling area of Northeast China. What is the fire area that caused the fire? 10 10000 hectares. 700,000 hectares of trees and forests lost more than 3 billion cubic meters and more than 56,000 trees, and the direct economic loss of the affected people was more than 5 million yuan (excluding forest losses). In addition to these disasters, Liaoning, Jilin and Heilongjiang also have disastrous weather and weeds such as early floods, summer cold damage and frost.

Natural disasters and their prevention

(1) Understand the basic concepts of natural disasters. Natural disasters are essentially harm to human life and property. Natural disasters that have a great impact on people, such as typhoons, floods, droughts, earthquakes, volcanic eruptions, landslides and mudslides. Natural disasters seriously affect the normal production and living order and threaten human safety. ② In the occurrence and harm of some natural disasters, we should know the monitoring and preventive measures of disasters, for example, the main reasons. Like floods. Flood causes heavy precipitation, snow melting, ice blocking channels, landslides, mudslides blocking rivers, natural or dam failure; When human beings and other economic activities, the speed of watershed division and waterway drainage is inaccurate. ② Flood disaster: industrial, agricultural and property losses; Human and animal casualties, outbreaks of pestilence and infectious diseases and other indirect losses: direct losses caused by interruption of water, electricity, transportation, energy supply, cessation of urban and rural commercial activities and irregular life. Flood control measures, engineering measures: building reservoirs, returning farmland to lakes, and improving flood storage capacity; Damming to prevent flooding; Dredge and speed up drainage; Opening flood diversion area and lowering flood level. Non-engineering measures: raise people's awareness of disasters, raise people's awareness of disaster prevention and mitigation, strictly control Sri Lanka's deforestation and forest coverage, and reduce soil erosion.