September 18, 2023
5.30 am
3BMeteo editorial team
reading time
19 seconds
A shock of earthquake of magnitude 3.3, occurred at 04:38 with epicenter in Marradi, in the province of Florence. The estimated depth was approx 8.7 km. You can monitor all the earthquakes in Italy and the main ones in the world in our special earthquakes section.
Earthquake data is constantly updated thanks to the National Institute of Geophysics and Volcanology: INGV
The question of the famous seismic precursors, or rather of those particular variations of some scientific parameters capable of making us understand that a strong earthquake is about to arrive, still remains one of the main debates in seismology. In fact, before a large earthquake, the stress states that accumulate under the earth’s surface lead to changes in various parameters. For decades we have been trying to understand whether some variations can actually represent a reliable seismic precursor, including for example the concentration of radon gas but not only. Before the Amatrice earthquake on August 24th, already from March-April, it seems that the concentration of Iron, Vanadium, Arsenic and Chromium increased up to 20 times.
