The 5 Richters that did not finally hit Naxos are due to a false indication of the automatic system of the Geodynamic Institute.
According to the Geodynamic Institute, in the end there was no earthquake on the island, as it was a false indication in the system.
In fact, as Geodynamic informs, the Automatic Solutions "come from the automatic computer system, without the participation of a seismologist".
This is the reason why seismic vibrations are then reviewed by a seismologist.
The 5 Richter that… did not hit Naxos
Earlier, the Geodynamic Institute spoke of an earthquake measuring 5 on the Richter scale, which occurred off Naxos, shortly after 6 pm on Thursday.
According to the automatic solution, the earthquake occurred 25 kilometers northeast of the island and had a focal depth of only 10 kilometers. 
in.gr