Figure 6. Numerical results of Scenarios 3 (left panels) and 4
(right panels). (a) and (f) show the stress change distribution; (b) and
(g) show the total slip distribution. (c) and (h) show the rupture time
contour with an interval of 5 seconds; the red curves indicate that the
rupture front reaches the trench at 51.5 s and 53.5 s, respectively. (d)
and (i) show the rupture velocity distribution. (e) and (j) show the
along-dip profiles of rupture velocity along the central line (red line
in (d) and (i)) and along 50 km away along-strike from the central line
(black line in (d) and (i)). The crosses in (d) and (i) indicate the
locations of the two on-fault stations.
Two stations at depth of 8.3 km and 22 km in both Scenarios show that
peak slip rate significantly decreases toward the trench (Figure 7a and
7c) and that high-frequency content depletes at the shallow station
(Figure 7b and 7d). With an employment of d = 30km, frequency
content between 0.5 and 3 Hz depletes more in Scenario 4 than in
Scenario 3 (Figure 7e). It appears that the depth-varying fault friction
properties in Scenarios 3 and 4 dominate high-frequency depletion at
shallow depth.