Monitoring of the 2011 Messinia (SW Greece) seismic swarm - G. Chouliaras; Kassaras, I.; Drakatos, G.; A. Ganas; V. Kouskouna; A. Moshou; A. Agalos; A. Karakonstantis; P. Argyrakis; Makropoulos, K. (33rd ESC General Assembly, 2012)