In this paper, the analysis regarding the negative impacts of earthquakes on infrastructures, other buildings and consequently on us is presented. With this knowledge we want to prevent or at least reduce the negative effects of earthquakes, from financial and economic losses to fatalities in the worst case scenario. In the introduction, we focus our attention to the understanding of earthquakes, their source, to the understanding of seismic waves and their spreading, etc. After that we focus on the biggest problem, which is the transfer of energy through seismic waves to the buildings, which cause oscillation. Oscillation is responsible for every negative effect, therefore our attention from here on is directed to earthquake engineering and it's use. In the experimental part, we want to analize what kind of oscillation reduction can be achieved with a simple example of a tuned mass damper. The results given by the analysis were rather dissapointing. The graphical results of the use of the mass damper showed a decrease in the oscillation, but the reduction was almost negligible. A noteworthy reduction in oscillation occurred only when we increased the mass of the damper to unrealistic numbers.