Such earthquakes have happened many times. Many times, when people are sleeping or working, earthquakes come. Most earthquakes are often ignored because people can't feel them. Some earthquakes are felt, and people will quickly run down tall buildings and wait in squares and other places. If there are no aftershocks, houses are not damaged, and each household is fighting on its own, it will hardly cause any waves. Everyone will go their own way. It seems that people are not interested in such an earthquake. Why do earthquakes happen so frequently today?

In fact, many years ago, after the tsunami in Indonesia, Miyagi Prefecture in Japan and other strong earthquakes, it was always said that the earth had entered a period of rapid geological activity, and earthquakes, especially major earthquakes, were a common phenomenon. But in fact, there are not many major earthquakes in the world, but every major earthquake will cause great damage. No matter the 2008 Indonesian tsunami or the 201/kloc-0 tsunami earthquake in Miyagi Prefecture, Japan, tens of thousands of people died, tens of thousands of people were missing, a large number of houses were destroyed, and even ships were washed ashore.

Although there are more and more reports of earthquakes today, it still cannot be said that the earth has entered a stage of rapid activity, which is unfounded. In fact, earthquakes are a very normal phenomenon, because there are a lot of magma and molten metal in the core, which is very viscous and has a strong impact. This molten material, like the atmosphere, has convective motion of thermal expansion and cold contraction, so magma has a strong impact on the crust, causing geological events such as earthquakes and volcanic eruptions in the crust.

The magnitude of earthquakes in the world every year is at least over one million, and most earthquakes are imperceptible. Several earthquakes can cause people on the ground to feel, but the impact is not great. A few strong earthquakes will cause serious shaking of buildings on the ground, causing certain casualties. As far as Japan is concerned, the number of earthquakes that can be detected by instruments in a year is very large, but the architectural form of Japan, etc. Generally, it won't cause any disaster. At most, a few earthquakes caused shaking and were injured by falling objects.

This statement is not the increase of earthquakes, but the progress of human monitoring technology. After the Wenchuan earthquake, China upgraded its earthquake monitoring and early warning system. At present, the earthquake can't be predicted, so we can only use the existing means to set more earthquake monitoring instruments on the geological fault zone, which can quickly collect information. The early warning time of the earthquake center may not be long, but it can exist in the surrounding areas for a long time, so that people can choose the appropriate way to avoid danger.

This kind of monitoring method can let us know that more people have an earthquake without feeling, and the sensitivity of the instrument far exceeds that of the human body. At the same time, early warning can also be made through mobile phones, television and other media, so that more people can be prepared. Now early warning has played a great role, for example, it was implemented earlier in Japan, for example, when watching TV, it suddenly jumped out with prompt information, earthquake location, magnitude and so on. In China, Wenchuan and other earthquakes, early warning reports in this area have also been strengthened.

Earthquakes rarely occur in some areas, which does not mean that the earth has entered a period of frequent geological activities. The earth's crust itself is invisible, and the current detection methods cannot guarantee complete detection. Some geological fault zones need time to accumulate energy before they erupt. For example, in the Guanzhong Plain of Shaanxi Province, there were even great earthquakes in the Tang Dynasty and many earthquakes in the ancient feudal dynasty, but few in modern times.

Nowadays, it is also a method to predict earthquakes with historical records. For example, counting the locations of major earthquakes, which only occur once every few years, can help predict earthquakes in a few hours or so. In the long run, like Japan, earthquakes are inevitable because of the dense geological faults in Sichuan and other places in China, but most earthquakes are imperceptible and the damage degree of most earthquakes is very limited.

Because the earthquake has caused great damage to modern cities, countries have strengthened earthquake early warning. Although technical means can't predict earthquakes, it can still improve people's self-help ability and coping ability in earthquakes. At the same time, increasing earthquake early warning information can help people understand geological activities such as earthquakes and improve people's awareness of disaster prevention.