Causes of natural disasters caused by earthquakes

Earthquake disaster refers to the strong ground vibration caused by earthquake and the associated ground cracks and deformation, which makes all kinds of buildings(construct)Buildings collapse and damage, equipment and facilities are damaged, traffic and communication are interrupted and other lifeline engineering facilities are destroyed, and the resulting disasters such as fire, explosion, plague, toxic substance leakage, radioactive pollution, site destruction and so on cause human and animal casualties and property losses.

Causes of natural disasters caused by earthquakes

The earth can be divided into three layers. The central layer is the core, which is mainly composed of iron.;In the middle is the mantle.;The outer layer is the crust. The earth’s crust is not a complete rock, but is composed of plates with different sizes embedded in each other, of which the largest seven are Antarctic plate, Eurasian plate, North American plate, South American plate, Pacific plate, India-Australia plate and Africa plate. The interior of the earth’s crust is constantly changing, resulting in the action of force.(That is, internal force action), make the crustal rock deformation, fracture, dislocation, and then an earthquake.

Earthquake disasters are sudden and unpredictable, and have high frequency, and produce serious secondary disasters. According to magnitude, it can be divided into seven categories.:Ultramicro-earthquake(Magnitude less thanonelevel)Weak earthquake(Magnitude less thanthreeLevel, people are generally not easy to perceive)Feel the earthquake(Magnitude greater than or equal tothreeLevel, less than4.5Level, people can feel, but generally will not cause damage.)Moderate and strong earthquakes(Magnitude greater than or equal to4.5Level, less thansixLevel, can cause damage to the earthquake.)Strong earthquake(Magnitude greater than or equal tosixLevel, less thansevenlevel)A major earthquake(Magnitude greater than or equal tosevenlevel)And a huge earthquake(Magnitude greater than or equal toeightlevel).