Combining a quantitative model relating ridge subduction and radiolarian biostratigraphical data from the Shimanto belt including accreted midocean ridge basalt, the plate configuration for the western North Pacific since 83 Ma can be reconstructed. The Kula-North New Guinea and North New Guinea-Pacific ridges passed along the Japan are. Assuming a constant plate motion, the half-spreading rates, angles at which ridges entered the trench, convergent rates and angles, and migration rates of triple junctions can be calculated.

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