Fig. 3: Geodynamic model in the northern Manila subduction zone.
This figure presents our preferred geodynamic model at 2006’s seismic source area. The procedure for acquiring the preferred model is detailed in the result section. A and B show the strength profiles for the Eurasian Plate (EUR) and Philippine Sea Plate (PHP), respectively, corresponding to the yellow and blue boxes in C. The red curve represents the viscous strength, which depends on the strain rate and temperature at that location; the green line indicates the frictional strength; the black line shows the lower of the two strengths, representing the lithospheric strength. The purple line denotes the temperature profile. C illustrates the phase distribution, illuminating the subduction zone morphology with white temperature contour with 200 °C intervals. D shows the second invariant of the deviatoric strain rate, with the red contours representing the plastic strain, ranging from 10−5 to 10−1. E displays the orientation (short black bars) and magnitudes (in MPa) of the maximum principal stress (σ1). C–E include black lines denote phase boundaries. The blue inverted triangles mark the deformation front, while the red inverted triangles indicate the accretionary wedge top.
