A seism or earthquake is the oscillatory, sudden, spatial, chaotic movement of the Earth’s surface caused by a very powerful shock produced by internal or external causes. At the time of the seismic shock, a large amount of kinetic energy is released. This propagates through the mass of the Earth as elastic waves called seismic waves which cause oscillations, and consequently earthquakes, when reaching the surface. The oscillations during the earthquake may lead to loss of lives. The earthquake may last only a few seconds, but the processes that cause earthquakes took place over millions of years.
Table of contents:
Classification of earthquakes
The main seismic area in Romania
Techniques for predicting the earthquakes by studying the earthquake precursors
