Coseismic Deformation Responses due to Geometrical Structure and Heterogeneity of the Accretionary Wedge: Study Case 2010 Mentawai Earthquake, West Sumatra, Indonesia

Figure 6

The predicted coseismic deformation at the GPS stations. The green arrow indicates the GPS observation data. The arrow scale at the bottom right corner of the figure shows 4 cm of the horizontal offset and the vertical offset used for the GPS offset except (b). (a) The surface deformation from the HOM-0topography model (orange arrow), HOM-topography model (gray arrow), HET-0topography (red arrow), and HET-topography (blue arrow). (b) The surface deformation from the wedge variation model. Length 175 km–width 16 km (cyan arrow), length 200 km–width 16 km (gray arrow), length 200 km–width 21 km (yellow arrow), length 200 km–width 26 km (black arrow), and length 225 km–width 16 km (red arrow). The scale arrow at the bottom right corner shows 4 cm for the horizontal offset and 2.5 cm for the vertical offset used for the GPS offset on the islands. Another arrow scale at the top right corner shows 2.5 cm for both horizontal and vertical displacement used for the GPS offset on mainland. (c–f) The surface deformation from the rigidity variation. (c) The model with constant Vp/Vs 1.6 and Vp variation 5.1-5.7 km/s. Vp 5.1 km/s (yellow arrow), Vp 5.3 km/s (cyan arrow), Vp 5.5 km/s (red arrow), and Vp 5.7 km/s (magenta arrow). (d) The model with constant Vp/Vs 2.2 and Vp variation 5.1-5.7 km/s. Vp 5.1 km/s (yellow arrow), Vp 5.3 km/s (cyan arrow), Vp 5.5 km/s (red arrow), and Vp 5.7 km/s (magenta arrow). (e) The model with constant Vp 5.1 km/s and Vp/Vs variation 1.6-2.2. Vp/Vs 1.6 (magenta arrow), Vp/Vs 1.8 (red arrow), Vp/Vs 2.0 (cyan arrow), and Vp/Vs 2.2 (yellow arrow). (f) The model with constant Vp 5.7 km/s and Vp/Vs variation 1.6-2.2. Vp/Vs 1.6 (magenta arrow), Vp/Vs 1.8(red arrow), Vp/Vs 2.0 (cyan arrow), and Vp/Vs 2.2 (yellow arrow).

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