Fig. 5

Temporal changes in T-axis azimuths with the horizontal (time) axis of the logarithm of the number of days elapsed after the mainshock. Temporal changes in T-axis azimuths for aftershocks in the western and eastern sides of the fault are displayed with the distance Y in the direction along the fault on the vertical axis in a and b, and with the depth Z on the vertical axis in c and d. The temporal change in the shallow region including the subregion shown in Fig. 4c is displayed in e with the distance X in the direction perpendicular to the fault on the vertical axis. The arrow approximately indicates the location of the estimated fault