Figure 1

Tectonic setting of the Pollino swarm seismic sequence. The dots show the seismicity for the 2010–2014 Pollino earthquake swarm sequence, colour-coded by their time of occurrence³². The epicentre of the largest shock (M _W 5.1) is shown as a red star. The green stars indicate the location of the M _W  > 3.5 events²⁷. The mechanisms of these events are taken from time domain moment tensor (TDMT) catalogue (red and green beach-balls, http://cnt.rm.ingv.it/tdmt) and from Passarelli et al.²⁷. White squares indicate the locations of the continuous GPS sites used in this work. The red lines represent the major mapped W-SW- dipping normal tectonic structures^{34, 36, 37}: MF, PF, CF and CPST stand for Mercure, Pollino, Castrovillari and Castello Seluci-Timpa della Manca fault, respectively. The blue lines are the new recently identified active faults after Brozzetti et al.³⁷: ROCS stands for the Rotonda-Campotenese normal fault system and MPR for the Morano Calabro-Piano di Ruggio fault. The inset shows the tectonic setting of Southern Italy and the historical macroseismic intensities⁵². Deep and intermediate seismicity in the Wadati-Benioff zone beneath the Tyrrhenian Sea, shown as contours of the subducted slab labeled in kilometers. The black lines with triangles represent the Plio-Pleistocene subduction front. The box encloses the main figure. AP = Apulia; SA = Southern Apennines; CA = Calabria; SI = Sicily. The map was created by using Generic Mapping Tools software (GMT v4.5.14; http://gmt.soest.hawaii.edu/)⁵³.