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.