5. Aftershocks and their correlation with the mainshock
rupture
27 M>=2.5 aftershocks located in the IRSC network within
the first 45 days after the mainshock (Fig. 4a). They have location
errors of <3 km, an azimuthal gap of <180°, and an
RMS of < 0.5 s. They concentrated in front of the mainshock
rupture direction. All of the aftershocks are at depths between 8 km to
14 km. Tatar et al., (2012) also located most of the microseisms on the
central segment of MSH and at depths between 10 km to 15 km.
The largest (M4.1) aftershock of the 2020 sequence (occurred on May 27)
is located right in front of the mainshock rupture, where it was
arrested, suggesting that the aftershock was a continuation of the same
slipped area. Its focal mechanism is almost the same as the mainshock
(Fig. 4a). There are two other aftershocks far from the mainshock slip:
one near the DMV, and the other in the area where the 24/11/1955
earthquake occurred.