The 2013 earthquake swarm in Helike, Greece: Seismic activity at the root of old normal faults - V. Kapetanidis; Deschamps, A.; Papadimitriou, P.; Matrullo, E.; A. Karakonstantis; G. Bozionelos; Kaviris, G.; Serpetsidaki, A.; Lyon-Caen, H.; Voulgaris, N.; Bernard, P.; Sokos, E.; et al. (Geophysical Journal International, 2015)