Figure 2. 3D grid search of the M5.1 mainshock centroid
location-time. (a) : Horizontal slice on the space-time
correlation plot of trial centroid point sources at a depth of 12 km.
The best result was obtained for source number 16 (the larger focal
mechanism) with a correlation of 85% situated almost 4 km WNW of the
hypocenter reported by IRSC (black star). (b) : Centroid time
correlation plot for the preferred point source #16. The best centroid
time has obtained 3.3 s after the IRSC reported origin time.
(c) : Waveform-fit between the real (solid) and synthetic
(dashed) displacements for the best obtained moment tensor. Station
names-components are written on the top of each sub-figure. Gray
waveforms were not used in the inversion, while the related synthetics
were produced by forward modeling.