3.Mainshock/largest Aftershock hypocenters
The mainshock and largest aftershock hypocenters were relocated by
visually reading the Pg and Sg crustal phases travel times recorded in
the IRSC network and inverting them using the HYPOCENTER code (Lienert
and Havskov, 1995). We used a velocity model of the area by Tatar et
al., (2012) and applied the station time corrections that were obtained
in their study. The obtained hypocenter was situated 4 km North and 2 km
East of the Mosha town, at a depth of 14 km (Fig. 4a; Table S1). It is 2
km to the North, 2 km to the East, and 3 km deeper than the IRSC
hypocenter.
For the M4.1 aftershock, the obtained hypocenter was located 2 km south
and 4 km West of the mainshock hypocenter and at a depth of 9 km (Fig.
4a). The latter is almost 1 km northwest of the IRSC reported hypocenter
and is 3 km shallower than their result.
We stress that the hypocenter locations of the earthquakes in the study
region provided by the BIN seismic network have higher uncertainty
compared to IRSC reported locations. This is due to a relatively sparse
coverage of the BIN network (only 3 stations in the distance of 100 km
from the earthquake). While the IRSC network had 10 stations in the same
distance from the source. The IIEES reported hypocenter for the
mainshock is located at 2 km to the West, 3 km to the South, and 4 km
shallower than our location. Their located hypocenter for the largest
aftershock is situated in 2 km to the West, 3 km to the South, and 1 km
deeper than our result.