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Fig. 4 | Progress in Earth and Planetary Science

Fig. 4

From: A possible mechanism for spontaneous cyclic back-arc spreading

Fig. 4

Results for case 1 a, d with Atr = 100 Ma, case 2 b, e with Atr = 60 Ma, and case 3 c, f with Atr = 40 Ma. σyield = 200 MPa and ϕAL = 0.1. ac Upper panel shows the change in velocities of the subducting plate (Vsp), the overriding plate (Vop) and the trench (Vtr). The average dip angle of the slab surface (Dip) measured in the depth range of 200–300 km is also shown. Lower panel shows the change in the maximum (Max), minimum (Min) and average (Ave) values of horizontal stress in the arc area (50 km width and 30 km depth). A positive value indicates tensional stress. df Time evolution of the slab geometry. The distribution of effective viscosity is shown by different colors and arrows indicate the velocity field

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