The Barcelonnette cluster. (a) Map of the seismicity from 2010 to 2019 in the Ubaye valley. The red frame highlights the location of Barcelonnette cluster and defines the selected earthquakes for the next subplots. Orange and red stars are the 2012 and 2014 mainshocks respectively. The two white stars indicate the macroseismic (m) and the instrumental (i) location of the April 5, 1959 earthquake (Nicolas et al., 1998). The white ellipse represents the extension of the 2003–2004 seismic swarm. (b) Cumulative number of earthquakes from 2010 to 2019 and magnitude distribution in time. (c) Zoom on the cumulative number of earthquakes and magnitudes in 2012. (d) Zoom on the cumulative number of earthquakes and magnitudes in 2014.