Fig. 3

Location of 750 primary selected local events (gray dots) after relocating with our 1D velocity model. The blue dots indicate the location of 251 final selected events to perform 3D tomography (see text regarding the selection criteria). Gray triangles and crosses show station location locations and positions of grid nodes in the study area, respectively. Horizontal ray coverage of the data set is depicted in black solid lines between the earthquake epicenter and stations. Two sections along latitude and longitude portray hypocenter distribution by depth. The histogram demonstrates earthquakes depth distribution for primary selected (gray) and final selected (blue) data sets. Note the vertical exaggeration factor of 5 in the cross sections