A location map with main faults (black) and seismic stations of the southern California seismic network (circles) used for the time period 2016 June 11–13. Green, red and black circles with 50 km diameter define three subarrays with 20 (green), 60 (red) and 103 (black) stations. The presented beamforming analysis is performed for a total of 375 subarrays with at least 15 stations.