Is it true that a small earthquake will be followed by a big earthquake?

After frequent small**, there will not necessarily be big**, and after large**, there will be frequent small**. Because it is the release of stress and pressure inside the earth's crust, the stress and pressure of plate movement are released after the frequent small **, which may not necessarily produce a large **, and the frequent and small ** after the large ** are aftershocks.

It is the result of tectonic activity, so the occurrence of the event must be related to a certain tectonic environment. At the same time, ** does not happen in isolation, it is just one event in the overall construction activity, and before this event, other events will occur. If you can confirm the event that happened before the ****, you can use it as a precursor to ****.

Not necessarily. If it is a small ** alone, there will generally be no big ** behind.

But if it is a large group of small **, then it is likely to be foreshock activity, and there may be a large **.

This one in Fujian is a single small earthquake activity, which does not explain any problems, so don't worry.

The saying that a big earthquake will be followed by a small earthquake is correct, and the statement that a small earthquake will be followed by a big earthquake is incorrect.

This statement is unscientific, **because the energy under the surface of the earth explodes from the fragile part of the earth's crust after reaching a certain level**, rather than a causal process, **still not accurate**, can only observe the changes of animals or surface water, etc.

Frequent small earthquakes will only cause the energy accumulated in the earth's crust to be lost, how can there be large earthquakes.

Small, medium and large rent-resistant earthquakes are divided according to the level of ground slow earthquakes, as follows:

1.Small earthquakes: Small earthquakes usually refer to earthquakes with a magnitude between **, which are weak and generally have no impact on buildings and man-made structures.

2.Medium earthquake: Medium earthquake usually refers to the magnitude of the earthquake between **, the tremor is strongly felt, and the vibration of buildings and man-made structures can be felt, but generally does not cause significant impact or loss.

3.Major earthquakes: large earthquakes usually refer to earthquakes with a magnitude above **, which are extremely strong, and can cause serious impacts such as the collapse of buildings and man-made structures and landslides, and pose a great threat to the safety of people's lives and property.

In addition, according to the genesis of the wave and the characteristics of the wave, it can also be divided into tectonics, volcanoes, subsidence and induction.

Small earthquakes, including the first magnitude of the earthquake in the whole section, are weak and generally have no impact on buildings and man-made structures. Moderate earthquakes, usually with magnitude between **, are felt strongly and can feel the vibration of buildings and man-made structures, but generally do not cause significant impact or loss. Large earthquakes, wide fronts usually refer to the magnitude of the earthquake above **, the earthquake is extremely strong, can cause the collapse of buildings and man-made structures that burn carefully, landslides and other serious impacts, and pose a great threat to the safety of people's lives and property.

According to the existing scientific level and economic conditions, China has put forward the fortification goal of "three levels" for building earthquake resistance, that is, the commonly said "small earthquakes do not make noise and the manuscript is broken, medium earthquakes can be repaired, and large earthquakes do not collapse".

The usual small, medium and large earthquakes refer to the probability of 50 years beyond 63% (frequent encounters**), 10% (fortification intensity**), 2 3% (rare old ships**).

Small earthquakes"The elastic displacement of the structure and the internal force of the component are calculated, and the cross-section reinforcement is designed by the ultimate limit state method, and the bearing capacity of the cross-section is carried out"Seismic design"，"Deformation design"

And according to the ductility and energy consumption requirements, the corresponding structural measures are adopted.

This is a popular name for the degree of intensity, the amount of energy released to divide, the magnitude can be calculated by the recording of the instrument, the higher the magnitude, the more energy is released. The magnitude standard used in China is the international general magnitude standard, called "Richter scale".Grading standards vary from country to country and from region to region.

Generally, ** less than 1 is called ultra-microseismic shock.

If it is greater than or equal to 1 and less than 3, it is called a weak earthquake or a microearthquake.

Greater than or equal to grade 3, less than grade is called sensible**.

Earthquakes greater than or equal to magnitude and less than magnitude 6 are called moderately strong earthquakes.

Earthquakes greater than or equal to magnitude 6 and less than magnitude 7 are called strong earthquakes.

Those greater than or equal to 7 levels are called large**.

Level 8 and above are called huge**.

To date, the largest recorded class in the world was Chile in South America in 1960.

Intensity: Intensity refers to the degree of damage to buildings such as ground and houses. For the same **, different areas, the intensity is different. If it is close to the epicenter, the damage will be great and the intensity will be high; If you are far away from the epicenter, the damage will be small and the intensity will be low.

Less than three degrees: people have no feelings, only instruments can record them;

Three degrees: people feel it in the dead of night;

4-5 degrees: the sleeping person wakes up, the chandelier swings;

Six degrees: utensils tipped, slight damage to the house;

6-7 degrees: house damage, ground cracks;

9-10 degrees: the house collapses, and the ground is seriously damaged;

10-12 degrees: devastating destruction.

Small epicenters, large earthquakes are the concept of earthquake resistance, and each region has a specified fortification intensity in the national seismic fortification division. The seismic code stipulates that the seismic concept of buildings is that small earthquakes are not damaged, medium earthquakes can be repaired, and large earthquakes cannot collapse; A small earthquake is not bad, that is, when it encounters the impact of ** below the fortification intensity of the area, it is generally not damaged or can continue to be used without repair. Medium earthquake repairability is when encountering the impact of the fortification intensity in the area, it may be damaged, and it can still be used after general repair or no repair.

The failure of a major earthquake means that when it encounters the impact of ** higher than the fortification intensity of the region, it will not collapse or cause serious damage that threatens life.

Correct Answer: There are various types. In the ** sequence, there is a "foreshock-mainshock-aftershock" type, and the small earthquake is the foreshock, which is used as a macro-search precursor of a large earthquake (mainshock) in this type.

Therefore, there is a "small earthquake, a big earthquake, **one more and one less quick report is not leaking", and the method of reporting a big earthquake with a small earthquake is said to be a loss.