GNGTS 2019 - Atti del 38° Convegno Nazionale

102 GNGTS 2019 S essione 1.1 earthquakes): 18 in the first period; 9 in the second period. The master-slave method by Got et al. (1994) is based on the computation of the time differences between the current event and the master event , for each cluster of similar waveforms, at each station. The method relies on the assumption that the distance between the two hypocenters is much smaller than the source-receiver distance. Under this hypothesis Fig. 1 - Data selected for the relative location analysis (panels A and B) and attenuation estimation (panel C). In panels A and B magenta circles represent the whole sequence epicenters. In panel A green circles represent the events selected from November 2011 to April 2012, in panel B the red circles represent the events from September 2012 to June 2013. The locations are taken from the ISIDE catalogue. The two yellow stars represent the two mainshocks: the M5.0 (west) and the M4.3 (east). Blue diamonds and cyan circles represent the seismic stations installed in the first and second period selected in this work. The faults are taken from Brozzetti et al. , 2017. In panel C, the red circles represent the events selected for the attenuation estimation, blue, magenta and red diamonds are the stations used for this analysis. On the right side of panel C we also show a vertical cross-section of the area.