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.