Such a force is very great, whenever a variety of natural disasters occur, it will always cause huge casualties and property losses to mankind. So that human beings are particularly afraid of the occurrence of various natural and man-made disasters, man-made disasters are okay, is a variety of natural disasters. Especially natural disasters in the uh earthquake is the most puzzling, people ah before that earthquakes often occur in the seismic zone, but in recent years there are a number of earthquakes it does not occur in the seismic zone, so that people feel that the law is very difficult to figure out the reasons for the following points.

I, the geophone itself is a price is very expensive.

It is itself we now live in the common use of some seismic instrument, it is a cost is very expensive, want to each area want to install such a one of a geophone measuring instrument, then it is very difficult, the country actually does not have too much of an instrument for the region within an installation, so that want to accurately and timely measurements, which is also a huge problem, as far as China is concerned! Every region can not install geodesic instruments, not to mention some other backward countries.

Second, earthquakes have become more and more frequent in recent years.

Secondly, there is another reason is that over the years a review of earthquakes and the frequency of more and more people can not urge to prevent at the same time it produces a number of people type of harm is also very huge, casualties and property damage are very horrible. More and more frequent earthquakes make people feel afraid, feel that such a planet is very dangerous. That's why it has become a worldwide problem.

Three, there is no regularity.

And the most important reason is that now the earthquake is not according to the regularity of the card, before the time people will think that is in some of the plate junction prone to earthquakes, but now many non-plate junction is also prone to earthquakes. That's why many countries have been discussing the study of the law of earthquakes, which is one of the world's most difficult problems.