An earthquake is what people often say. It is a rebound caused by the rupture and dislocation of underground strata, and the surface vibration is caused by the propagation of seismic waves to the surface. This is a very common natural phenomenon, almost as common as wind and rain. It's not that "the dragon king is angry" or "the fish has turned over". That superstition is absolutely wrong.

Earthquakes occur every day on the earth, 1 10,000 times a day, about 5 million times a year. Earthquakes often occur in many parts of the world, but they are too small to be detected without sensitive instruments. This kind of earthquake accounts for about 99% of the total number of earthquakes in a year, and the remaining 1%, about 50,000 times, can be felt by people. Among them, it can cause 1000 damage. Strong earthquakes with magnitude greater than 7 are about a dozen times a year on average. As for stronger earthquakes, they occur once a year on average. Most earthquakes don't hurt people.

Due to the movement of the plate, the strata in different parts of the plate are subjected to various forces such as extrusion, tension and torsion. In those places with fragile structures, when they can't bear all kinds of forces, the rock stratum will suddenly break and move, and at the same time, it will stimulate a kind of seismic wave that spreads around. When the local seismic wave reaches the ground, it causes the ground to vibrate. This is an earthquake. This kind of earthquake is called tectonic earthquake.

According to the current statistics, there have been 17 earthquakes with magnitude above 8 in the history of our country, with the largest magnitude of 8.5.

Experts believe that it is a better way to escape from the earthquake by quickly evacuating to a safe place after the earthquake. Shock absorption should be chosen in a solid place indoors, under (next to) objects that can cover the body, which is easy to form a triangular space, a small place with support, and an open and safe place indoors.

According to the investigation of 874 survivors of Tangshan earthquake, 258 of them took emergency earthquake prevention measures, 188 people escaped safely, accounting for about 72% of the people who took earthquake prevention measures.

The posture that the body should take:

Lie down, squat or sit down, curl up as much as possible and lower your center of gravity.

Grab a solid object, such as a table leg.

Protect your head, neck and eyes, and cover your mouth and nose.

Avoid crowds, don't crowd around, and don't light open flames casually, because there may be flammable and explosive gases in the air.