Modern instrumental seismology, born at the end of the nineteenth century, has developed in recent years in order to understand and define the behavior and propagation of seismic waves. The study of seismicity and seismic waves allows us to delve deeper into both the structure of planet Earth and to study the origin of earthquakes, their main causes, and to discover and study seismogenic sources. Seismology allows us to observe the macroscopic effects of earthquakes, their geographical distribution, allows us to identify the most vulnerable soils and allow for more correct construction planning.