**2. Analysis of the deformations of the Earth's crust before and after the Skopje earthquake in September 2016**

In order to see the daily changes in the distances between reference stations, we obtained the coordinates of referent stations Skopje, Tetovo, Kumanovo, and Veles from the cadaster in Skopje (**Figure 1**).

**Figure 1.** *Reference stations near Skopje.*

#### **Figure 2.**

*Daily changes of distances between the observed MAKPOS GNSS stations around Skopje.*

*The Possibility of Earthquake Forecasting, a Few Days before the Earthquake Using GNSS... DOI: http://dx.doi.org/10.5772/intechopen.108848*

We calculated the daily distance changes between reference stations in the vicinity of Skopje and presented the changes graphically in **Figure 2** [3].

**Figure 2** shows the decrease in all the distances between the stations on the 8th of September 2016 (i.e., the terrain has compressed), and the strongest earthquake in this area with a magnitude of 5.2 according to the Richter scale occurred 3 days later.
