An earthquake of magnitude 5.5 occurred in Mangya City, Haixi Prefecture, Qinghai Province, with a focal depth of 1 1 km. How are earthquakes formed?

The first is the natural phenomenon that the earth's crust vibrates in the process of rapidly releasing energy, and seismic waves will be generated in this process. The collision between the upper wall and the plate on the earth caused the dislocation and rupture of the plate edge and inside, which was the main cause of the earthquake. The lithosphere on the earth's surface is not a complete block, but divided into many plates, which are constantly moving and colliding with each other under the action of thermal convection in the lower mantle. Within each plate, the rocks are not complete, but there are many faults hidden.

Secondly, according to the theory of plate tectonics, the earth consists of three parts: the core, the mantle and the crust, which are concentric circles. Each plate is located in the asthenosphere. Because the temperature of the mantle near the core is higher than that of the upper mantle near the crust, this remarkable temperature difference leads to the convection of the mantle and the movement of the plate. There are two different ways of plate movement, namely, the separation and collision of adjacent plates.

Furthermore, people usually use magnitude to represent the magnitude of an earthquake. The bigger the earthquake, the greater the magnitude. You can't feel an earthquake below magnitude 2.5. Judging from the magnitude 5 earthquake, fragile buildings may collapse. When the earthquake magnitude exceeds 7 stories, all buildings will be damaged. The strongest earthquake in the world is 9.5. At present, scientists cannot accurately predict earthquakes. But that doesn't mean that we can't make any preparations for the earthquake. If you live in a place where earthquakes often occur, you can prepare an emergency kit for everyone in your family. Even if your place is relatively safe, you can prepare this emergency kit in case of emergency. ?

What we should know is that earthquakes cannot be predicted in advance. We can only rely on the electromagnetic wave speed advantage of the earthquake early warning system to provide people in other areas with a few seconds of early warning to avoid some casualties. It can't tell people when and where the earthquake will happen like the weather forecast, so why can't the current technical level predict the earthquake in advance? In fact, a big reason is that we still know very little about the plate movement inside the earth.