Figure 3
From: Monitoring soil radon during the 2016–2017 central Italy sequence in light of seismicity
(a) Time series of soil radon concentration (Bq m−3) from NRCA (red) and CTTR (blue) stations. While CTTR registered almost continuously since August 2012, NRCA was installed the day right after the occurrence of the Amatrice Mw 6.0 mainshock. (b) Zoom over the period corresponding to the major seismic activity of the central Italy sequence of 2016–2017. Green bars indicate the number of earthquakes/day occurred within a radius of 40 km from the two stations, with yellow stars in correspondence of the four Mw ≥ 5.5 mainshocks (see Fig. 1).
